# Best weather and climate data APIs for AI agents (slim)

> Xweather Weather API (B), Google Weather API (Maps Platform) (B) and Pirate Weather (B) lead the 16 ranked weather and climate data APIs. Picks by need, strengths, weaknesses and prices from the Anchor benchmark.

- Full: https://www.anchorterminal.com/best/weather/index.md (~5,900 tokens) · this version ~1,580 tokens · JSON https://www.anchorterminal.com/best/weather/index.json · canonical https://www.anchorterminal.com/best/weather/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

The 10 highest-scoring of 16 weather and climate data APIs on the Anchor benchmark, with a pick for each need and where each one falls short. Scores come from public evidence, re-checked as vendors change.

- Ranked: 16 · agent-ready (BB or better): 0 · accept x402: 0 · hosted endpoints: 16
- Full ranked table: https://www.anchorterminal.com/categories/weather.md
- Head-to-head comparisons: https://www.anchorterminal.com/compare/weather/index.md (120)
- Methodology: https://www.anchorterminal.com/benchmark/index.md

## The shortlist

| # | Tool | Grade | Score | Best for | Price | Where |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | [Xweather Weather API](https://www.anchorterminal.com/tools/xweather.md) | B | 67.1 | Teams that need lightning, hail, road weather or tropical data beside ordinary conditions and forecasts, with an MCP server and an OpenAPI file ready for agents. | Freemium | hosted |
| 2 | [Google Weather API (Maps Platform)](https://www.anchorterminal.com/tools/google-weather-api.md) | B | 66.8 | Best when the answer has to match what users see in Google products, for current conditions and 10-day forecasts with alerts. | $0.15 / 1k req | hosted |
| 3 | [Pirate Weather](https://www.anchorterminal.com/tools/pirate-weather.md) | B | 65.9 | Agents and apps that want Dark Sky-shaped forecasts, model transparency and deep history on a small budget. | $2 / mo | hosted |
| 4 | [WeatherAPI.com](https://www.anchorterminal.com/tools/weatherapi-com.md) | B | 65.3 | Cheap, high-volume consumer forecasts where the location arrives as a city, postcode or IP. | $7 / mo | hosted |
| 5 | [Open-Meteo](https://www.anchorterminal.com/tools/open-meteo.md) | B | 63.4 | Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup. | Freemium | hosted |
| 6 | [meteoblue Weather API](https://www.anchorterminal.com/tools/meteoblue.md) | C | 61.7 | Energy, agriculture and marine applications that need solar, wind, soil, sea or ensemble variables at a point, with history back to 1940 on a paid plan. | Freemium | hosted |
| 7 | [Visual Crossing Weather API](https://www.anchorterminal.com/tools/visual-crossing.md) | C | 59.9 | History and backfills, climate normals and date-range questions from one endpoint. | $0.10 / 1k req | hosted |
| 8 | [Weatherbit API](https://www.anchorterminal.com/tools/weatherbit.md) | C | 57.7 | An application that needs forecasts plus specialised datasets (air quality, lightning, soil and degree days) from one paid subscription, queried by coordinates. | Freemium | hosted |
| 9 | [OpenWeather One Call API](https://www.anchorterminal.com/tools/openweather-one-call.md) | C | 57.4 | Agents that need a global forecast plus deep history from one vendor at low cost, and for any agent that has to provision its own key. | $1.50 / 1k req | hosted |
| 10 | [The Weather Company Data APIs](https://www.anchorterminal.com/tools/weather-company.md) | D | 52.6 | A business that wants one contract for global forecasts, 4 km current conditions, alerts, imagery, aviation and deep history, and that can go through sales. | $500 / mo | hosted |

## Picks by need

- Highest score overall: [Xweather Weather API](https://www.anchorterminal.com/tools/xweather.md), B, 67.1/100 on the benchmark. Also [Google Weather API (Maps Platform)](https://www.anchorterminal.com/tools/google-weather-api.md), B, 66.8/100.
- Reliability: [Weatherbit API](https://www.anchorterminal.com/tools/weatherbit.md), 91/100 on reliability, against 74 for the overall leader.
- Schema & documentation: [WeatherAPI.com](https://www.anchorterminal.com/tools/weatherapi-com.md), 89/100 on schema & documentation, against 83 for the overall leader.
- Agent ergonomics: [Open-Meteo](https://www.anchorterminal.com/tools/open-meteo.md), 85/100 on agent ergonomics, against 78 for the overall leader.
- Security & auth: [Google Weather API (Maps Platform)](https://www.anchorterminal.com/tools/google-weather-api.md), 71/100 on security & auth, against 52 for the overall leader.
- Maintenance & community: [Open-Meteo](https://www.anchorterminal.com/tools/open-meteo.md), 90/100 on maintenance & community, against 81 for the overall leader.
- Transparency & trust: [Google Weather API (Maps Platform)](https://www.anchorterminal.com/tools/google-weather-api.md), 72/100 on transparency & trust, against 68 for the overall leader.
- Lowest paid price per 1,000 requests: [WeatherAPI.com](https://www.anchorterminal.com/tools/weatherapi-com.md), $0.0023 per 1,000 requests, the lowest of the 7 listings here with a paid price in this unit (free allowances aside). Also [Google Weather API (Maps Platform)](https://www.anchorterminal.com/tools/google-weather-api.md), $0.06 per 1,000 requests.
- A hosted MCP endpoint: [Pirate Weather](https://www.anchorterminal.com/tools/pirate-weather.md), remote MCP server, nothing to install.

## How to choose

- Forecast range and refresh rate: Check how far ahead forecasts run and how often they refresh, since a forecast that updates less often than the agent queries can mislead decisions made near a deadline.
- Historical depth: Check how far back historical data goes, since a short history may not support the seasonal comparisons or baselines an agent needs.
- Licence, attribution and caching: Read the licence terms, attribution and caching limits, since they decide whether an agent may store, redistribute or show the figures without credit.
- Cost per thousand calls: Compare the cost per thousand calls at your expected volume, since current, forecast and historical endpoints may each bill differently.

- How the benchmark tests this category: The same locations queried for current conditions, a 10-day forecast and a year of history. We check what each returns, how often it updates, the licence terms and the cost per thousand calls.

Each listing's verdict, strengths and weaknesses: https://www.anchorterminal.com/best/weather/index.md