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What's the best free weather API?

A commercial recommendation prompt. We size how many people ask ChatGPT this from real search demand, then run it through ChatGPT to see which websites it recommends.

Est. people asking / mo
1.5K
CPC
$0.25
Total est. value / mo
$23
Common ways people ask this (14)
  • What's the best free weather API for developers?
  • What's the best free weather API for personal projects?
  • What's the best free weather API for commercial use?
  • What's the best free weather API for current weather data?
  • What's the best free weather API for forecasts?
  • What's the best free weather API for historical weather data?
  • What's the best free weather API for hourly forecasts?
  • What's the best free weather API for daily forecasts?
  • What's the best free weather API for severe weather alerts?
  • What's the best free weather API for easy integration?
  • What's the best free weather API for high request limits?
  • What's the best free weather API for global coverage?
  • What's the best free weather API for local weather data?
  • What's the best free weather API for accurate precipitation data?

What ChatGPT actually answered

One of the 5 times we asked ChatGPT this, verbatim. The leaderboard below aggregates all 5 runs.

Websites ChatGPT recommends for this prompt

Aggregated across 5 runs (min 2/5 appearances). Estimated visits split the prompt's demand by rank. Sites matching the prompt's own brand are marked branded and excluded from the leaderboard.

RankWebsiteAppearsEst. visits / moEst. value / mo
1 weatherapi.com 5/5 30 $7
2 openweathermap.org 5/5 18 $4
3 visualcrossing.com 5/5 12 $3
4 open-meteo.com 5/5 8 $2
5 tomorrow.io 5/5 6 $1
6 meteostat.net 5/5 5 $1
7 weatherstack.com 5/5 3 $0
8 weatherbit.io 5/5 3 $0
9 meteomatics.com 5/5 2 $0
10 api.weather.gov brand 4/5 2 $0
11 met.no 5/5 1 $0
12 accuweather.com 5/5 1 $0
13 worldweatheronline.com 5/5 1 $0
14 climacell.co 5/5 1 $0
15 weather.gov brand 3/5 0 $0
16 stormglass.io 2/5 0 $0
17 apixu.com 3/5 0 $0
18 wunderground.com 2/5 0 $0
19 meteoblue.com 3/5 0 $0
20 aerisweather.com 2/5 0 $0
How is this estimated?

ChatGPT doesn't publish prompts, so we don't show logged conversations. We measure real demand for this topic from Google search volume, scale it to ChatGPT's user base (on average about 1 ChatGPT user for every 8 Google searchers, a ratio that varies by topic), and run the prompt through ChatGPT 5 times to record which websites it recommends and in what order. Estimated visits split that demand across the recommended sites by a click-through-by-rank curve. Every number is a modeled estimate, not measured analytics. Full methodology →