Ecowitt WS90 vs Tempest: Modular Gateway vs All-in-One Smart Home
Documented differences in local integrations, sensor expansion, lightning detection, and irrigation platform support — based on manufacturer specifications.
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Ecowitt WS90 with a GW2000/GW3000 gateway fits buyers who want documented local Home Assistant integrations and modular add-on sensors such as soil moisture probes. Tempest fits buyers who want a single outdoor unit with built-in lightning detection and documented Rachio smart irrigation integration.
Ecowitt WS90 7-in-1 Ultrasonic (WittBoy Pro)
The Ecowitt WS90 is a solid-state outdoor sensor array with ultrasonic wind measurement and a piezoelectric rain sensor. Per Ecowitt documentation it must pair with a separate GW-series gateway for Wi-Fi, Ethernet, and Home Assistant integrations.
Tempest Weather System by WeatherFlow
The Tempest is an all-in-one outdoor unit with ultrasonic wind, haptic rain, and integrated lightning detection. WeatherFlow documents local UDP and WebSocket APIs plus smart irrigation integrations such as Rachio.
Side-by-side differences
Factual comparison from documented specifications — not independent testing.
Architecture: modular gateway vs all-in-one hub
Ecowitt separates RF sensors from an IP gateway (GW2000/GW3000). Tempest combines sensors in one housing and uses a WeatherFlow hub for Wi-Fi connectivity and local UDP output.
Swap or add sensors without replacing the entire outdoor array.
Fewer components to mount and cable for a standard suburban install.
Local data for automations
Ecowitt documents LAN HTTP APIs on supported gateways. Tempest documents local UDP and WebSocket consumers on the home network.
Official Ecowitt Home Assistant integration with GW2000/GW3000.
Single-vendor app experience with optional local API for self-hosted dashboards.
Who Should Buy Ecowitt WS90
- •Home Assistant owners who want modular WH51 soil moisture or air quality add-ons
- •Buyers planning Ethernet gateways — see GW2000 vs GW3000 guide
- •Garden and greenhouse owners expanding sensor count over time
- •Users comparing Ecowitt against Ambient Weather ecosystems
Who Should Buy Tempest Weather
- •Homeowners with Rachio controllers who want documented Tempest integration
- •Buyers who want built-in lightning alerts without add-on hardware
- •Users preferring a minimal component list and mobile-first experience
- •Coastal or storm-aware properties needing lightning proximity data
Final Recommendation
Choose Ecowitt WS90 when modular expansion and documented Ecowitt Home Assistant integrations are priorities. Choose Tempest when built-in lightning detection and Rachio-centric irrigation workflows matter more than add-on sensor flexibility.
Related Comparisons
Ecowitt WS90 
Ambient Weather Ecowitt vs Ambient Weather: Local Home Assistant vs All-in-One Console
Ecowitt WS90 with a GW2000/GW3000 gateway is a better fit when you want documented local Home Assistant integrations and modular sensor expansion. Ambient WS-5000 is a better fit when you want a polished console bundle with integrated display and are comfortable with AmbientWeather.net for cloud features — using Custom Server community tools if you require local push.
Ambient Weather Ambient Weather Ambient WS-2902 vs WS-5000: All-in-One Console vs Modular Ultrasonic
The WS-2902 is the simpler Ambient bundle with an all-in-one sensor array and color console. The WS-5000 adds separated sensor placement, ultrasonic wind, a premium TFT console, and Ethernet on supported SKUs — a better fit when siting flexibility or winter wind sensing matters.