AcuRite 00621 Weather Forecaster Instruction Manual

Instruction ManualWeather Forecastermodel 00621

Questions? Contact Customer Support at (877) 221-1252 or visit THIS MANUAL FOR FUTURE REFERENCE.

Congratulations on your new AcuRite product. To ensure the best possible product performance, please read this manual in its entirety and retain it for future reference.

Unpacking Instructions

Remove the protective film that is applied to the LCD screen prior to using this product. Locate the tab and peel it off to remove it.

Package Contents

  1. Display unit
  2. Outdoor sensor
  3. Instruction Manual

Features & BenefitsOUTDOOR SENSOR

1. Integrated HangerFor easy placement.2. Wireless Signal IndicatorFlashes when data is being sent to the display unit.3. Battery Compartment4. Battery Compartment Cover

Features & BenefitsDISPLAY UNIT

  1. 12 to 24 Hour Weather ForecastSelf-Calibrating Forecasting pulls data from the outdoor sensor to generate your personal forecast.
  2. Learning Mode Icon Disappears after weather forecast self-calibration is complete.
  3. Sensor Low Battery Indicator 
  4. Current Outdoor Temperature
  5. Outdoor Sensor Signal Strength
  6. Moon Phase
  7. Pressure History GraphTracks and displays the barometric pressure history.
  8. Current Barometric Pressure 
  9. Date
  10.  Intelli-Time ClockAutomatically updates for Daylight Saving Time.
  11. Current Indoor Temperature 
  12. Display Low Battery Indicator


  1. RESET ButtonFull reset to factory defaults.
  2. “▲” ButtonFor setup preferences and viewing records.
  3.  “▼” ButtonFor setup preferences and viewing records.
  4. SET Button For setup preferences.
  5. Fold-out Tabletop Stand
  6. Battery Compartment
  7. Intelli-Time BatteryCompartment
  8. Integrated Hang HoleFor easy placement.
  9.  Battery Compartment Cover


Install or Replace BatteriesAcuRite recommends high-quality alkaline batteries for the best product performance. Heavy duty or rechargeable batteries are not recommended. The outdoor sensor requires lithium batteries in low-temperature conditions. Cold temperatures can cause alkaline batteries to function improperly. Use lithium batteries in the outdoor sensor for temperatures below -4ºF / -20ºC.

Outdoor Sensor

  1. Slide off the battery compartment cover.
  2. Insert 2 x AA batteries into the battery compartment, as shown. Follow the polarity (+/-) diagram in the battery compartment.
  3.  Replace the battery cover.

Display Unit

  1. Slide off the battery compartment cover.
  2. Insert 2 x AA batteries into the battery compartment, as shown. Follow the polarity (+/-) diagram in the battery compartment.
  3. Replace the battery cover.

PLEASE DISPOSE OF OLD OR DEFECTIVE BATTERIES IN AN ENVIRONMENTALLY SAFE WAY AND IN ACCORDANCE WITH YOUR LOCAL LAWS  AND REGULATIONS.BATTERY SAFETY: Clean the battery contacts and also those of the device prior to battery installation. Remove batteries from equipment that is not to be used for an extended period of time. Follow the polarity (+/-) diagram in the battery compartment. Promptly remove dead batteries from the device. Dispose of used batteries properly. Only batteries of the same or equivalent type as recommended are to be used. DO NOT incinerate used batteries. DO NOT dispose of batteries in fire, as batteries may explode or leak. DO NOT mix old and new batteries or types of batteries (alkaline/standard). DO NOT use rechargeable batteries. DO NOT recharge non-rechargeable batteries. DO NOT short-circuit the supply terminals.


Intelli-Time products are pre-programmed with the correct time and date.Intelli-Time technology instructs the time and date to set themselves. All you need to do is select your Time Zone and Daylight Saving Time preferences. The clock will then automatically set itself and change for Daylight Saving Time.

Set the Time, Date & Units

Press the “SET” button, located on the back of the display unit, to enter SET MODE. Once in set mode, the preference you are currently setting will blink on the display.To adjust the currently selected (flashing) item, press and release the “” or ““ buttons (press and HOLD to fast adjust).To save your adjustments, press and release the “SET” button again to adjust the next preference. The preference set order is as follows:TIME ZONE ( PST MST CST EST AST HAST AKST)DST (Daylight Saving Time ON or OFF)*CLOCK HOURCLOCK MINUTECALENDAR MONTHCALENDAR DATECALENDAR YEARMEASUREMENT UNITS (˚F/inHg or ˚C/hPa)*If you live in an area that observes DST, DST should be set to ON, even if it is not currently Daylight Saving Time.You will automatically exit SET MODE if no buttons are pressed for 30 seconds.Enter setup mode at any time by pressing the “SET” button.

Placement for Maximum AccuracyAcuRite sensors are sensitive to surrounding environmental conditions. Proper placement of both the display unit and outdoor sensor are critical to the accuracy and performance of this product.Display Unit PlacementPlace the display unit in a dry area free of dirt and dust.The display unit stands upright for tabletop use or is wall-mountable.Outdoor Sensor PlacementSensors must be placed outside to observe outdoor conditions.  The sensor is water-resistant and is designed for general outdoor use, however, to extend its life place the sensor in an area protected from direct weather elements.Hang the sensor using the integrated hang holes or hanger, or by using string (not included) to hang it from a suitable location, like a well-covered tree branch. The best location is 4 to 8 feet above the ground with permanent shade and plenty of fresh airto circulate around the sensor.

Important Placement Guidelines

  • To ensure accurate temperature measurement, place units out of direct sunlight and away from any heat sources or vents.
  • The display unit and outdoor sensor must be within 165 ft (50 m) of each other.
  • To maximize wireless range, place units away from large metallic items, thick walls, metal surfaces, or other objects that may limit wireless communication.
  • To prevent wireless interference, place both units at least 3 ft (.9 m) away from electronic devices (TV, computer, microwave, radio, etc.).

Setup is CompleteThe sensor will now synchronize with the display unit. It may take a few minutes for synchronization to complete. Please refer to the troubleshooting section of this manual if anything appears to be functioning improperly.


Using the Weather Forecaster Learning ModeSelf-Calibrating Forecasting uses a unique algorithm to analyze changes in pressure over a time period (called Learning Mode) to determine your altitude. After 14 days, the  Learning Mode icon disappears from the display screen. At this point, the self-calibrated pressure is tuned in to your location and the unit is ready for superior weather prediction.Weather ForecastAcuRite’s patented Self-Calibrating Forecasting provides your personal forecast of weather conditions for the next 12 to 24 hours by collecting data from the sensor in your backyard. It generates a forecast with pinpoint accuracy –

View the complete list of icons at

Moon PhaseTrack the phases of the moon, conveyed through simple lunar phase icons.

Barometric PressureSubtle variations in barometric pressure greatly impact the weather. This weather forecaster displays the current pressure in inHg or hPa. The history chart lets you monitor the change in pressure over time.High & Low Records Today’s high and low records are displayed for indoor and outdoor temperatures. Today’s records automatically clear at 12:00am-midnight every day. To view, today’s LOW  records, press the “” button on the back of the unit. To manually clear today’s LOW recorded values, press and hold the “” button for 2 seconds. Dashes display to confirm you have cleared the LOW records.To view, today’s HIGH records, press the “” button on the back of the unit. To manually clear today’s HIGH recorded values, press and hold the “” button for 2 seconds. Dashes display to confirm you have cleared the HIGH records.


No outdoor sensor reception no bars If the wireless signal indicator shows no bars:•Relocate the display unit and/or the outdoor sensor. The units must be within 165 ft (50 m) of each other.•Make sure both units are placed at least 3 feet (.9m) away from electronics that may interfere with wireless communication (such as TVs, microwaves, computers, etc).•Use standard alkaline batteries (or lithium batteries in the sensor when the temperature is below -4°F/-20°C). Do not use heavy-duty or rechargeable batteries. NOTE: It may take up to 20 minutes for the display unit and sensor to synchronize after batteries are replaced.
Display screen not working •Check that the batteries are installed correctly. Batteries may need to be replaced.•Press the RESET button, located inside the battery compartment of the display unit.
Outdoor  temperature is flashing or showing dashes Flashing of the outdoor temperature is generally an indication of wireless interference.1. Bring both the sensor and display unit indoors and remove at least one battery from each.2. Reinstall the battery in the outdoor sensor.3. Reinstall the battery in the display unit.4. Let the units sit within a couple of feet of each other for about 20 minutes to gain a strong connection.
Inaccurate forecast •Weather Forecast icon predicts conditions for the next 12 to 24 hours, not current conditions.•Has the Learning Mode icon disappeared from the display unit? Learning Mode must complete before forecast and pressure will be accurate.•Allow the unit to run continuously for 33 days. Battery removal or resetting the display unit will restart Learning Mode. After 14 days, the forecast should be fairly accurate, however, Learning Mode calibrates for a total of 33 days.
Inaccurate temperature •Make sure both the display unit and sensor are placed out of direct sunlight and away from any heat sources or vents (see page 6).

If your AcuRite product does not operate properly after trying the troubleshooting steps, visit or call (877) 221-1252 for assistance.

Care & Maintenance

Display Unit CareClean with a soft, damp cloth. Do not use caustic cleaners or abrasives. Keep away from dust, dirt, and moisture. Clean ventilation ports regularly with a gentle puff of air.Outdoor Sensor CareClean with a soft damp cloth. Do not use caustic cleaners or abrasives.

Replace Intelli-Time BatteryIntelli-Time technology is powered by a pre-installed coin-cell battery that stores the time and date settings. The battery has a shelf life of several years. Time and date will need to be entered after replacing the Intelli-Time battery. To replace the Intelli-Time battery:

  1. Locate the coin cell battery compartment door on the back of the display unit, inside the battery compartment. Unscrew and remove the compartment cover.
  2. Insert 1 x CR2032 coin cell battery into the battery compartment, as shown. Install battery with “+” positive terminal facing OUT.
  3. Screw in the battery cover.


TEMPERATURE RANGE Outdoor: -40ºF to 158ºF; -40ºC to 70ºC
Indoor: 32ºF to 122ºF; 0ºC to 50ºC
WIRELESS RANGE 165 ft / 50 m depending on home construction materials
POWER Display: 2 x AA alkaline batteries
Sensor: 2 x AA alkaline or lithium batteries
DATA REPORTING 30-second updates

FCC Information

This device complies with part 15 of FCC rules. Operation is subject to the following two conditions:

  1. This device may NOT cause harmful interference, and
  2. This device must accept any interference received, including interference that may cause undesired operation.

WARNING: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, There is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and  on, the user is encouraged to try to correct the interference by one or more of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and the receiver.
  • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
  • Consult the dealer or inexperienced radio/TV technician for help.

NOTE: The manufacturer is not responsible for any radio or TV interference caused by unauthorized modifications to this equipment. Such modifications could void the user authority to operate the equipment. This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions:

  1. This device may not cause interference, and
  2. This device must accept any interference received, including interference that may cause undesired operation of the device.

Customer Support

AcuRite customer support is committed to providing you with best-in-class service. For assistance, please have the model number of this product available and contact us in any  of the following ways:

(877) 221-1252  [email protected]

24/7 support at

► Installation Videos► Instruction Manuals► Replacement Parts► Register your Product► Support User Forum► Submit Feedback & Ideas

Limited One Year Warranty

At AcuRite, we proudly uphold our commitment to quality technology. Chaney Instrument Co. warrants that all products it manufactures to be of good material and workmanship and to be free of defects when properly installed and operated for a period of one year from the date of purchase.We recommend that you visit us at for the fastest way to register your product. However, product registration does not eliminate the need to retain your original proof of purchase in order to obtain warranty benefits.Chaney Instrument Co. warrants that all products it manufactures to be of good material and workmanship and to be free of defects when properly installed and operated for a  period of one year from the date of purchase. Remedy for breach of this warranty is limited to repair or replacement of the defective item(s). Any product which, under normal use and service, is proven to breach the warranty contained herein within ONE YEAR from date of sale will, upon examination by Chaney, and at its sole option, be repaired or replaced by Chaney.Transportation costs and charges for returned goods shall be paid for by the purchaser. Chaney hereby disclaims all responsibility for such transportation costs and charges. This warranty will not be breached, and Chaney will give no credit for products it manufactures which have received normal wear and tear, been damaged (including by acts of nature), tampered, abused, improperly installed, damaged in shipping, or repaired or altered by others than authorized representatives of Chaney.The above-described warranty is expressly in lieu of all other warranties, express or implied, and all other warranties are hereby expressly disclaimed, including without limitation the implied warranty of merchantability and the implied warranty of fitness for a particular purpose. Chaney expressly disclaims all liability for special, consequential or incidental damages, whether arising in tort or by contract from any breach of this warranty. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. Chaney further disclaims all liability from personal injury relating to its products to the extent permitted by law. By acceptance of any of Chaney’s products,  the purchaser assumes all liability for the consequences arising from their use or misuse. No person, firm or corporation is authorized to assume for Chaney any other liability in connection with the sale of its products. Furthermore, no person, firm or corporation is authorized to modify or waive the terms of this paragraph, and the preceding paragraph, unless done in writing and signed by a duly authorized agent of Chaney. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.For in-warranty claims: Chaney Instrument Co.965 Wells St., Lake Geneva, WI 53147

It’s more than accurate, it’s AcuRite offers an extensive assortment of precision instruments, designed to provide you with information you can depend on to Plan your day with  confidence™.

Chaney Instrument Co. All rights reserved. AcuRite is a registered trademark of the Chaney Instrument Co., Lake Geneva, WI 53147. All other trademarks and copyrights are the property of their respective owners. AcuRite uses patented technology. Visit for details.

Printed in China00621 INST 030415


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