Ecowitt WS90 vs Tempest: Modular Sensor + Gateway vs All-in-One System
This is an A vs B buying decision: Ecowitt WS90 outdoor sensor + a compatible Ecowitt gateway/console path versus the Tempest Weather System retail package (outdoor sensor + Wi-Fi Hub + mount). Architecture, expansion, wind/rain/lightning, and connectivity come first — based on manufacturer documentation and published specs, not lab testing.
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Choose WS90 for modular expansion and gateway flexibility; choose Tempest for a simpler complete system with built-in lightning. There is no universal winner — the better fit depends on whether you want an expandable Ecowitt stack or a complete retail Tempest package.
Ecowitt WS90 7-in-1 Outdoor Sensor
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.
Tempest Weather System by WeatherFlow
The Tempest Weather System by WeatherFlow is a complete smart weather station that pairs an all-in-one outdoor sensor with an included Wi-Fi Hub. The outdoor unit measures temperature, humidity, wind speed and direction, rainfall, barometric pressure, solar radiation, ambient light, and UV, and it includes built-in lightning detection. Ultrasonic wind sensing and haptic rain mean there are no wind cups or tipping-bucket parts to maintain. You view conditions in the Tempest app and can connect the system to supported smart-home tools — without needing a separate physical display console.
Side-by-side differences
Factual comparison from documented specifications — not independent testing.
What is included and how the architecture differs
WS90 is a 7-in-1 outdoor sensor only: ultrasonic wind, piezo/haptic rain, temp/humidity, UV, and light — with no direct Wi-Fi or Ethernet, no built-in lightning, and no onboard pressure. A compatible Ecowitt gateway or console is required; do not compare a WS90 sensor-only listing price to a complete Tempest system price without adding gateway cost (or using a GW2001-style GW2000 + WS90 bundle). Tempest’s retail system packages the all-in-one outdoor sensor, Wi-Fi Hub, and mounting hardware as one purchase — solar-powered outdoors, no physical console, app-first viewing.
Choose gateway capacity and expand the sensor set over time without replacing the outdoor array.
One retail package with hub and mount included — fewer separate modules to source.
Wind, rain, lightning, and pressure
Both use ultrasonic wind and haptic-style rain. WS90 documents 0–40 m/s measurement range; Tempest documents 0–100 mph — both are measurement ranges, not survival ratings, so numeric max alone should not decide the purchase. Lightning favors Tempest’s built-in detection; WS90 needs an optional WH57 through a compatible gateway. Pressure is not on the WS90 itself — it arrives via a supported Ecowitt gateway/console path — while Tempest includes pressure in the outdoor sensing path. Tempest rain may use optional RainCheck / NC Rain cloud assistance; keep expectations to rain estimates, not flood prediction.
Modular path to add lightning (WH57) and other sensors when you need them.
Built-in lightning and onboard pressure without buying separate add-ons.
Connectivity, expansion, and installation
Ecowitt connectivity depends on the gateway: Wi-Fi, Ethernet on GW2000/GW3000-class hubs, and local network data paths. Tempest uses the included Wi-Fi Hub with documented local UDP/WebSocket consumers and no Ethernet on the retail hub. Expansion is the clearest Ecowitt advantage — including WH51 soil moisture as an accessory that still needs a compatible gateway — while Tempest stays a fixed outdoor suite. Installation: Ecowitt is sensor + gateway; Tempest is outdoor unit + hub. Simpler packaging does not remove siting and mounting decisions for either system. Garden soil use cases map to the Garden hub; this page stays the hardware A vs B choice.
Ethernet-capable gateways and a broad add-on catalog for multi-sensor properties.
Fewer outdoor modules and a complete hub-included package for typical home installs.
Home Assistant and irrigation (secondary)
After the weather-station decision, integrations can matter. Ecowitt supports strong modular Home Assistant-compatible workflows through supported gateway/local network paths where documented. Tempest documents local UDP/WebSocket paths that can support integrations as well. Tempest’s documented Rachio pairing is a useful irrigation ecosystem differentiator for some buyers — it should not crown an overall winner by itself. For integration workflows see Smart Weather; for soil/irrigation use cases see Garden.
Modular local-network and HA-compatible gateway workflows when you expand sensors over time.
Documented Rachio path plus local UDP/WebSocket options without assembling a gateway stack.
Who Should Buy Ecowitt WS90
- •Buyers who want modular expansion and expect to add soil, air-quality, or lightning sensors later
- •Anyone who wants gateway choice, including Ethernet on compatible Ecowitt hubs
- •Users who prioritize local-network flexibility and multi-sensor growth
- •Garden or greenhouse setups comparing Ecowitt accessories such as WH51 (accessory + gateway required)
Who Should Buy Tempest Weather
- •Buyers who want a complete retail system with hub and mount included
- •Anyone who prefers simpler all-in-one outdoor hardware and fewer separate sensor modules
- •Users who want built-in lightning detection without an add-on sensor
- •Homeowners who prefer app-first viewing without a physical console — and may value documented Rachio pairing as a secondary plus
Final Recommendation
Choose Ecowitt WS90 if you prioritize modular expansion, gateway flexibility (including Ethernet on compatible hubs), and room to add soil, air-quality, or lightning sensors later. Choose Tempest if you want a simpler complete retail system with an included Wi-Fi Hub, all-in-one outdoor hardware, and built-in lightning. WS90 is the stronger fit for modular expansion and gateway flexibility; Tempest is the stronger fit for buyers who want a simpler complete system with built-in lightning.
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