OpenWeatherMap API
Comprehensive weather data API providing current conditions, forecasts, historical data, and weather alerts for any location worldwide via REST endpoints.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Single API key. No scope granularity. Weather data is not sensitive. Free tier: 1,000 API calls/day. SOC2 not documented. Straightforward key auth for weather data.
⚡ Reliability
Best When
You need reliable, globally comprehensive weather data with a generous free tier and simple API integration.
Avoid When
You need very high accuracy hyperlocal forecasts or aviation/maritime precision weather data.
Use Cases
- • Getting current weather and forecasts for agent decision-making
- • Building weather-aware automation (agriculture, logistics, events)
- • Historical weather data analysis and climate research
- • Severe weather alerts and notifications
- • Displaying weather widgets in apps and dashboards
Not For
- • Hyper-local precision weather (professional meteorology services)
- • Real-time lightning/radar data at high resolution
- • Aviation-grade weather (use specialized aviation weather APIs)
Interface
Authentication
Single API key passed as appid query parameter. Simple key-based access with no scopes.
Pricing
Generous free tier covers most small to medium use cases. One Call API 3.0 now requires credit card but has a free 1000 calls/day.
Agent Metadata
Known Gotchas
- ⚠ API key activation takes up to 2 hours after creation - new keys fail with 401 initially
- ⚠ One Call API 3.0 (newer unified API) now requires credit card registration despite free tier
- ⚠ Free tier has both daily and per-minute rate limits - minute limit is the common gotcha
- ⚠ Forecast data uses Unix timestamps - agents must handle timezone conversion carefully
- ⚠ Different API versions (2.5 vs 3.0) have different endpoint structures and response formats
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-07.