Tomorrow.io (formerly ClimaCell) delivers hyperlocal weather intelligence sourced from proprietary IoT sensor networks, radar, satellites, and ML models. Get precipitation-level precision, severe weather alerts, timeline forecasts, and custom weather event triggers for automation.
https://api.tomorrow.io/v4
Auth type
API Key Header
Auth header
x-api-key: your-api-key
Rate limit
3 requests/s (free)
Pricing
Pay per use
Free quota
500 calls/day
Documentation
https://docs.tomorrow.io/reference
Endpoint status
Server online — HTTP 404 — server is online but path returned an error (may require auth)470ms
(checked Mar 29, 2026)
Builder score
B
65%
builder-friendly
Pass your API key in the apikey query parameter or the x-api-key header.
x-api-key: your-api-key
Free: 500 calls/day. Developer: $99/mo. Startup: $299/mo. Enterprise: custom pricing for high-volume and custom data layers.
| Method | Path | Description |
|---|---|---|
| GET | /weather/realtime |
Real-time weather conditions at a location |
| GET | /weather/forecast |
Hourly/daily forecast up to 6 months |
| GET | /weather/history/recent |
Historical weather (last 6 hours) |
| POST | /events/search |
Search for weather events matching criteria |
curl "https://api.tomorrow.io/v4/weather/realtime?location=42.3478,-71.0466&units=metric" \ -H "x-api-key: $TOMORROW_API_KEY"
{
"data": {
"time": "2024-01-18T12:00:00Z",
"values": {
"temperature": 5.2,
"humidity": 62,
"precipitationIntensity": 0,
"windSpeed": 8.1,
"weatherCode": 1100
}
},
"location": {"lat": 42.3478, "lon": -71.0466, "name": "Boston, MA"}
}
Data sourced from API Map. Always verify pricing and rate limits against the official Tomorrow.io documentation.