Weather and climate · by RainViewer (MeteoLab Inc.)

RainViewer Weather Maps API

A free public JSON index plus PNG map tiles of a global weather-radar composite built from 1200+ radars, covering the past 2 hours with nowcast frames, ready to drop on a Leaflet or MapLibre map.

You can animate live rain moving across most of the world on your own map with one JSON call and a tile URL template, no key needed.

LiveAPI, no keyCommercial: conditions

Open rainviewer.com/api.html ↗ agent.md

For your project

Official API: Official API · Free Personal, educational and small-scale community use only; no hard rate limits posted but cache aggressively (abuse may get your IP blocked); maximum tile zoom level 7; no SLA
“Free public weather radar API for personal, educational, and small-scale community use.” rainviewer.com/api.html
Key: Not needed
“No registration or API key is required for the free tier. You can fetch the JSON endpoints and tile URLs directly from your application.” rainviewer.com/api.html
Formats: JSON, PNG
Data download: No bulk download found
License: RainViewer API terms of use Free Weather Maps API (radar tiles and JSON index); commercial or high-volume use only under bespoke terms arranged with RainViewer
Commercial use: Commercial use with conditions
“The free tier targets personal, educational, and small community projects. For high-volume traffic, commercial integration, or any use case where you depend on guaranteed availability, get in touch — bespoke commercial terms are arranged case-by-case.” rainviewer.com/api.html
Credit: Credit required
“You must display credit such as "Weather data by RainViewer" with a link back to rainviewer.com somewhere visible in your app or website.” rainviewer.com/api.html
Embedding: Embedding with conditions
“You can build map overlays, automated weather notifications, embedded radar widgets, and similar applications using only this endpoint.” rainviewer.com/api.html
Using the website: Free

Read on RainViewer Weather Maps API's own pages on Oct 23, 2026 · license or terms · API docs. Check the license page before you ship.

For your agent

A request your code or agent can make with no key:

https://api.rainviewer.com/public/weather-maps.json

Fetch weather-maps.json, then build tiles as {host}{path}/{size}/{z}/{x}/{y}/{color}/{options}.png from radar.past[] and radar.nowcast[]; zoom stops at 7, paths change every few minutes, and the satellite infrared array was empty in our test.
Personal, educational or small community use only on the free tier; commercial or high-volume use needs terms agreed with RainViewer.
Show 'Weather data by RainViewer' with a link to rainviewer.com wherever the radar appears.
Cache the JSON and tiles, do not request beyond zoom 7, and build in retries; there is no SLA.

llms.txt: www.rainviewer.com/llms.txt

Paste into your agent: Read https://agentgid.com/resources/rainviewer-api/agent.md before using RainViewer Weather Maps API.

What you can build

Rain in the next hour: an alert for your cityA bot or widget that warns when rain is coming soon, from free weather-service forecasts and radar.

A rain-radar layer for a hobby hiking or cycling map (Leaflet) that animates the last 2 hours plus nowcast, with 'Weather data by RainViewer' linked.
A school weather-station dashboard showing the radar loop for the region next to the station's own readings.
A home-automation notifier that checks the radar tile over the user's coordinates and warns when rain pixels approach.

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