~/CLIRank

Best Weather APIs for AI Agents in 2026

Browse the top Weather APIs used by developers worldwide. Below: the top 4 Weather APIs by CLIRank score, the independent rubric for how well an API actually works with AI coding agents like Claude Code and Cursor.

1
OpenWeatherMap/10Weather Data

Weather API with current, forecast, historical, and air pollution data.

Best for: Most generous free tier - 1,000 calls/day for free

current weatherforecast weatherhistorical dataair pollution
2
Tomorrow.io/10Weather Intelligence

Weather intelligence API with minute-level forecasts and actionable insights.

Best for: Most accurate hyperlocal weather data

real-time weatherminute-level forecastroute planningweather alerts
3
Visual Crossing/10Weather Data

Weather data API with historical, forecast, and statistical weather data.

Best for: Best value for historical weather data access

historical weatherforecast weatherstatistical dataweather alerts
4
AccuWeather/10Weather Data

Weather API with localised forecasts, severe weather alerts, and lifestyle indices.

Best for: Highest brand recognition - trusted by enterprises

current conditionsforecast weathersevere alertslifestyle indices

Frequently asked questions

What makes an Weather API "agent-friendly"?

For AI coding agents, the highest-impact signals are: an official SDK on npm or PyPI, environment variable authentication (no browser OAuth flow), JSON responses that parse cleanly, machine-readable pricing, and reasonable rate limits for scripted use. APIs missing more than two of these are painful for agents to use reliably.

How do you score Weather APIs?

Each API is rated on 8 signals worth 1-2 points each (11 raw, normalised to 10). The full rubric: official SDK (+2), env var auth (+2), headless compatible (+2), CLI tool (+1), JSON response (+1), curl/CLI docs examples (+1), reasonable rate limits (+1), machine-readable pricing (+1). The top-scoring API in this category right now is OpenWeatherMap at null/10.

Why isn't [my favourite API] on this list?

This list shows the top 4 Weather APIs by score. The full ranking includes 4 APIs in this category. If yours is missing entirely, submit it at clirank.dev/submit - it gets auto-scored and added if it clears the threshold.

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