Ecowitt WS90 7-in-1 Outdoor Sensor Overview
Solid-state outdoor weather sensor for temperature, humidity, wind, rain, UV, and light — pairs with an Ecowitt gateway
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The Ecowitt WS90 is a solid-state outdoor weather sensor that measures temperature, humidity, wind speed and direction, rainfall, UV, and light (solar intensity). It has no moving wind cups and uses a haptic/piezoelectric rain sensor instead of a tipping-bucket gauge. The WS90 cannot work alone — it must pair with a compatible Ecowitt gateway or console for display, Wi-Fi/Ethernet, app access, and smart-home use. If you already own an Ecowitt gateway, buy the sensor-only listing; if you are starting from scratch, the GW2001 bundle includes the WS90 plus a GW2000 gateway.
Specifications and compatibility notes are based on manufacturer documentation — not independent Atmosiva testing.
Known limitations
- •Amazon ASIN B0BGKGR17W is the WS90 sensor-only listing (Style WS90BN). ASIN B09TZZTYPK is the GW2001 bundle (WS90 + GW2000 gateway) — use sensor-only if you already have a compatible Ecowitt gateway; choose the bundle if you are starting from scratch
- •The WS90 does not include Wi-Fi or Ethernet. Local LAN, Home Assistant, Ecowitt.net, and Weather Underground paths require a paired Ecowitt gateway or console
- •Rainfall uses a haptic/piezoelectric sensor (not a tipping bucket). Accuracy can vary with wind and drop size; Ecowitt suggests adding a WH40 if precise rainfall is a priority
- •No onboard barometric pressure or lightning detection — pressure typically comes from a gateway/console probe; lightning is an optional WH57 add-on via a compatible gateway
- •Regional RF frequency (e.g. 915 MHz US) must match your Ecowitt gateway and any add-on sensors
- •Temperature/humidity accuracies on this page follow the current Ecowitt WS90 manual (±1°C, ±5% RH). Some retailer tables list different figures — verify the latest Ecowitt documentation for your firmware
Expansion options
- •Optional Ecowitt add-on sensors via a compatible gateway (not built into the WS90)
- •WH51 soil moisture probes for garden and irrigation setups
- •WH57 lightning detector add-on
- •WH41/WH45 air-quality sensors on supported gateways
- •WH40 tipping-bucket rain gauge if you want a traditional rain reference alongside the WS90
Pros
- + Ultrasonic wind sensing with no wind cups
- + Haptic/piezo rain sensing with no tipping bucket
- + Measures temperature, humidity, wind, rainfall, UV, and light
- + Solar-powered outdoor design with battery backup
- + Works with the Ecowitt gateway ecosystem
- + Available as sensor-only or as part of the GW2001 complete bundle
Cons
- − Requires a separate compatible Ecowitt gateway if bought sensor-only
- − Piezo rain accuracy can vary in some wind and drop-size conditions
- − No onboard barometric pressure sensor
- − No built-in lightning detector
- − More setup than a traditional console-included station
Technical Specifications
Ultrasonic anemometer — measurement range 0–40 m/s; accuracy ±1 m/s below 10 m/s and ±10% at 10 m/s or above (per Ecowitt WS90 manual — not a survival rating)
Piezoelectric / haptic rainfall sensor (not a tipping-bucket gauge)
±1°C temperature, ±5% RH humidity (per Ecowitt WS90 manual)
RF to a compatible Ecowitt gateway or console only. The WS90 has no Wi-Fi or Ethernet. After pairing, the gateway provides LAN/local HTTP paths, Ecowitt.net, Weather Underground, and Home Assistant integrations
Over 150 m line-of-sight in open areas (915/868/433 MHz regional RF — match your gateway)
Home Assistant and LAN/local API access require a paired Ecowitt gateway (built-in Ecowitt integration and official HACS). Ecowitt.net and Weather Underground uploads also run through the gateway — not from the WS90 sensor alone
Solar powered with supercapacitor and 2×AA backup batteries (batteries not included per Ecowitt docs)
~8.8 s data reporting interval; wind sampling every 2 s (per Ecowitt WS90 manual)
Compatibility & Integrations
Sensor Capabilities
WS90 itself measures outdoor temperature, humidity, ultrasonic wind, haptic rain, UV, and light. It does not measure barometric pressure or lightning. Soil moisture and air-quality readings require optional Ecowitt add-on sensors via a compatible gateway — not built into the WS90
Smart Home
- Home Assistant: Yes
- Weather Underground: Yes
- Alexa: No
- Rachio: No
- API Support: Yes
Home Assistant and LAN/local API access require a paired Ecowitt gateway (built-in Ecowitt integration and official HACS). Ecowitt.net and Weather Underground uploads also run through the gateway — not from the WS90 sensor alone
Connectivity
- Wi-Fi: No
- Ethernet: No
- Bluetooth: No
- Local Data: No
- Cloud Required: No
- Subscription Required: No
The Ecowitt WS90 is a solid-state outdoor weather sensor that measures temperature, humidity, wind speed and direction, rainfall, UV, and light (solar intensity). It has no moving wind cups and uses a haptic/piezoelectric rain sensor instead of a tipping-bucket gauge. The WS90 cannot work alone — it must pair with a compatible Ecowitt gateway or console for display, Wi-Fi/Ethernet, app access, and smart-home use. If you already own an Ecowitt gateway, buy the sensor-only listing; if you are starting from scratch, the GW2001 bundle includes the WS90 plus a GW2000 gateway.
Homeowners who want a compact solid-state outdoor weather sensor and are ready to use an Ecowitt gateway or the GW2001 complete bundle
- • Ultrasonic wind (measurement range 0–40 m/s per Ecowitt WS90 manual)
- • Haptic/piezoelectric rainfall sensing
- • Outdoor temperature, humidity, UV, and light
- • Solar power with supercapacitor and 2×AA backup
- • Requires compatible Ecowitt gateway or console
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Related Weather Stations
Ecowitt GW2001 Weather Station (GW2000 + WS90)
See retailer for current price
Complete Ecowitt weather station bundle with GW2000 gateway and WS90 7-in-1 outdoor sensor
Ecowitt GW3000 Wi-Fi & Ethernet Gateway
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Advanced Ecowitt gateway with Wi-Fi, Ethernet, local storage, and support for a large sensor ecosystem
Ecowitt WH57 Lightning Sensor
See retailer for current price
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