Quick answer
Greenhouses need accurate temp/humidity inside the structure plus context from outdoor conditions (wind, rain, solar). Most owners use:
- Outdoor personal weather station for exterior rain/wind/solar.
- Indoor or in-greenhouse wireless sensors (Ecowitt WH32/WH40 class thermo-hygrometers or Ambient remote channels) for interior microclimate.
Ecowitt fits multi-zone greenhouse monitoring with several RF sensors on one gateway. Ambient fits if you want a single-brand console showing indoor/outdoor channels together.
Atmosiva has not independently validated greenhouse sensor placement — follow manufacturer siting notes and avoid direct sun on interior probes.
Who this guide is for
- Hobby greenhouses, polytunnels, and cold frames needing humidity and frost awareness.
- Growers integrating vent fan or heater automations via Home Assistant — see Home Assistant guide.
- Gardeners already comparing soil probes — soil moisture guide.
Inside vs outside sensing
| Location | Typical measurements | Notes |
|---|---|---|
| Outside array | Rain, wind, exterior temp baseline | Standard mast or fence mount |
| Inside greenhouse | Temp, humidity, optional soil pots | Shield probe from direct sun and irrigation spray |
| Bench-level | Soil moisture in containers | Capacitive probes per Ecowitt/Ambient accessory docs |
Do not mount the outdoor rain gauge inside a greenhouse — rainfall totals will not represent field conditions.
Options compared
| Approach | Hardware | Strength |
|---|---|---|
| Modular Ecowitt | WS90 + gateway + indoor WH sensors | Many zones, Home Assistant friendly |
| Ambient bundle | WS-2902 or WS-5000 + remote thermo-hygrometers | Integrated console UI |
| Automation-first | Ecowitt or Tempest outdoor + HA indoor sensors | Mix vendors if documented |
Ecowitt multi-zone approach
Ecowitt gateways accept multiple RF temperature/humidity transmitters and WH51 soil probes per catalog documentation. This suits seedling benches, propagation zones, and main house zones on one dashboard.
Pair with gardeners guide for broader bed monitoring outside the greenhouse.
Ambient console approach
Ambient consoles display indoor/outdoor channels on one screen when paired with compatible remote sensors — useful if operators prefer a fixed display in the greenhouse office without opening Home Assistant.
Compare Ambient flagship vs value bundle: WS-2902 vs WS-5000.
Buyer checklist
- Separate interior humidity sensor from the outdoor array.
- Ventilation fans change interior humidity quickly — sample near plant canopy height.
- Confirm maximum remote sensor count on your gateway/console SKU.
- For summer overheating, track exterior solar/UV if your array supports it.
- Coastal greenhouses — see coastal areas guide.
