Tomorrow.io Weather API
Hyperlocal weather intelligence API providing real-time conditions, forecasts up to 21 days, historical data, and severe weather alerts for any location.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
API key in query parameter is a security anti-pattern shared with other weather APIs. No scopes or granular permissions. TLS enforced. No significant known security incidents.
⚡ Reliability
Best When
An agent needs accurate hyperlocal weather data with actionable severity classification, particularly for logistics, agriculture, or operations where weather directly affects decisions.
Avoid When
You need purely historical climate archives at bulk scale, or you are building a simple weather display app where OpenWeatherMap's free tier suffices.
Use Cases
- • Logistics and routing agents adjusting plans based on weather conditions along a route
- • Agriculture agents monitoring soil moisture, precipitation, and temperature for crop decisions
- • Event planning agents evaluating weather risk for outdoor activities
- • Energy management agents forecasting solar irradiance and wind for renewable output prediction
- • Construction project management agents flagging weather-related work stoppages
Not For
- • Academic climate research requiring long-form historical records (commercial API not designed for bulk archive downloads)
- • Aviation-specific weather data (use dedicated aviation weather services)
- • Very low-cost prototypes — free tier is restrictive for real agent workflows
Interface
Authentication
API key passed as apikey query parameter. Single key with no scope differentiation. Free key available on signup without credit card. Webhooks for alert delivery require endpoint registration.
Pricing
Free tier is usable for development and light production workloads but 500 calls/day limits multi-location monitoring. Historical data requires paid plan. Pricing is higher than simpler weather APIs but the accuracy justifies it for commercial use cases.
Agent Metadata
Known Gotchas
- ⚠ Free tier hourly limit of 25 calls is easy to exceed if an agent monitors multiple locations — plan API budget carefully
- ⚠ API key passed as query parameter is exposed in logs — prefer using environment variables and ensure logs are sanitized
- ⚠ Forecast accuracy degrades significantly beyond 7 days — agents making long-range commitments should note confidence intervals
- ⚠ Location lookup accepts lat/lon or place names, but place name resolution can be ambiguous — use lat/lon for reliability
- ⚠ Webhook delivery for storm alerts requires a publicly accessible HTTPS endpoint — agents running on local or private networks need a tunnel or polling fallback
- ⚠ Historical data access requires a paid plan — agents that need to backfill or audit past conditions cannot use the free tier
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-07.