Ecowitt WS3900 with 7.5" Display with 7-in-1 Sensor Array, IoT & WiFi

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The Ecowitt WS3900 weather station is a colour 7.5" LCD display Wi-Fi weather station which supports monitoring both indoor and outdoor conditions.

It is also one of the first consoles to support connection to the Ecowitt IoT devices, such as the Ecowitt WFC01 and AC1100, achieving smart control through the Ecowitt App.

The WS3900 connects to your 2.4GHz Wi-Fi network for viewing uploaded data from anywhere on your phone, tablet, or computer browser, all for free when uploaded to

The display has built-in temperature, humidity and barometric pressure sensors receiving readings from Ecowitt sensors on the 868MHz frequency.

Included is the 7-in-1 sensor array which transmits wind speed, wind direction, rainfall, UV, solar radiation, temperature and humidity to the console. The 7-in-1 sensor array also includes a solar panel to power the unit during daylight and extend the battery runtime. 

Unlike some other consoles, the Ecowitt WS3900 can be used with a variety of additional sensors, click here to view the latest Ecowitt sensor matrix  and also view further details of which sensors are visible on the screen in the Technical Tab above.

The package contains:

  • Main WS3900 colour 7.1" console
  • UK Power Adapter
  • External 7-in-1 sensor pack
  • Wind cups
  • Wind vane
  • Rain funnel (pre installed)
  • Hardware for pole attachment maximum 50mm diameter (pole not included)
  • Requires 5 x AA batteries (not included)

Station features:

  • Colour 7.1" LCD console
  • Five icon colour forecast 
  • Internet controlled clock for accuracy
  • Indoor temperature and humidity
  • Solar and battery powered 7-in-1 outdoor sensor with
    • Outdoor temperature and humidity
    • Rain measurement  
    • Wind speed
    • Wind direction
    • UV sensor
    • Daylight sensor for measurement in Lux 0-400k, fc or w/m2
  • Pressure measurement in hPa, historical pressure for last 12, 24, 48 and 72 hours
  • Pressure trend
  • Daily minimum and maximum values
  • Measurement alarms
  • External sensor calibration 
  • 868MHz UK and EU frequency
  • Mains powered with backup battery (1 day backup)
  • 2.4GHz WiFi with 30 meter unobstructed transmission range
  • FREE data upload to, Weather Underground, UK MetOffice (WoW), Weather Cloud & your own customer server
  • Sensor signal reception indicator
  • Mountable external sensor on pole up to 50mm diameter

      Measurement ranges:

      • Transmission range unobstructed maximum 100m (330 ft)
      • Outdoor Temperature -25C - +60C (-14F to +140F) resolution 0.1C
      • Indoor Temperature -9.9C - +60C resolution 0.1C
      • Outdoor Humidity 10% - 99% 
      • Indoor Humidity 1% - 99%
      • Rain 0.25mm 0-6000mm +/-10%
      • Wind speed 0-100mph (0-50m/s)
      • Light 0-400k Lux +/- 15%
      • UV Level 1  - 15 +/- 3
      • Measuring interval 16 seconds
      • Air Pressure 300-1100hPa (8.85-32.5in Hg) +/- 3hPa
      • Calibration available for accurate readings

        A copy of the WS3900 weather station instructions can be downloaded by clicking here


        Sensor Data Can be Displayed directly on the Console:

        Sensor Model

        Max QTY

        Displayed Readings

        WS90 or


        Outdoor temperature & humidity, light, UV, wind speed/direction, rainfall

        WS80 or


        Outdoor temperature & humidity, light, UV, wind speed/direction 

        WS69 or (included)


        Outdoor temperature & humidity, light, UV, wind speed/direction, rainfall



        Light, UV, wind speed/ direction,






        Indoor temperature, humidity and pressure



        Outdoor temperature and humidity



        WH45: CO2, PM2.5, PM10, temperature and humidity

        WH46: CO2, PM1.0, PM2.5, PM4.0, PM10, temperature and humidity



        WN31: Temperature and humidity

        WN30: Temperature probe sensor

        WN36: Pool temperature

        Sensor Data Can Only be Uploaded for viewing in the Cloud

        Sensor Model

        Max QTY




        Lightning detection



        PM2.5 Air Quality



        Water leak detection



        Soil moisture




        Soil/liquid temperature



        Leaf wetness

        IoT Device

        Sensor Model

        Max QTY

        Function of Device



        Smart water timer


        Smart plug

        Customer Reviews

        Based on 1 review
        Richard Bracegirdle
        5 Stars for the EcoWitt WS3900

        Had my EcoWitt WS3900 for a couple of weeks now and very pleased with it. Setting up was no problem and everything worked out of the box. Love the colour display and the fact the transmitter unit up the pole runs on AA batteries. Unlike the previous weather station, a Davis Vantage Vue which used a CR123 and after about 7 years of use, started giving a 'low battery transmitter' warning after only 2 weeks of replacing the CR123 battery in it. Electronics in the Vantage Vue are sealed and there was no way of replacing the supercap that was the problem. Repair would have meant spending £275 for a new electronics unit and wired in sensors. So the EcoWitt replaced it and have to say - well worth the £159 price tag. Delighted with it, and would highly recommend it. In addition, the customer service from Weather Spares was also worthy of a 5 Star rating !! Thank you Weather Spares !!

        UK Order Preperation & Shipping

        • Economy (£4.70 or free on orders over £80) 2 to 6 working days. Some smaller items shipped at a reduced rate of £3.50
        • Standard (£5.95) 1 to 2 days for mainland UK. Some smaller items shipped at a reduced rate of £4.10
        • Express (£8.95) guaranteed next working day for mainland UK Highland and Islands, Northern Island 2 to 3 working days. Available on orders placed before 11am

        Europe & Rest of WorldOrder Preperation & Shipping

        • Europe (from £4.50) per order
        • Rest of the World (from £9.60) per order

        Please note that there may be local import duties (VAT/TVA) to be paid on before receipt of your goods from your local customs agent. We are registered with the European IOSS scheme which means duties will be prepaid for orders under €150

        Our full shipping policy can be read here.

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