Brandwave

Open-Meteo vs Tomorrow.io:Which is more popular?

In September 2026, Open-Meteo had more branded searches than Tomorrow.io among weather APIs worldwide. Open-Meteo had about 41,200 branded searches, while Tomorrow.io had 4,450. Open-Meteo made up 0.66% of all weather API searches we track, and Tomorrow.io accounted for 0.07%. When we asked ChatGPT and Google AI Overviews about weather APIs, Open-Meteo appeared in all five answers and Tomorrow.io in four. Open-Meteo was mentioned before Tomorrow.io in four out of five answers.

Among weather APIs worldwide in September 2026

Who do people search for more?

Open-Meteo, about 9 searches for every 1 for Tomorrow.io

Open-Meteo 41.2K searchesTomorrow.io 4.5K searches

Who does AI mention more?

Open-Meteo, mentioned in every answer we collected

Open-Meteo in 5 of 5Tomorrow.io in 4 of 5

Who does AI recommend more?

Open-Meteo, named ahead of Tomorrow.io in 4 of 5 answers

Open-Meteo first in 4Tomorrow.io first in 1

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Top weather APIs in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, Open-Meteo appeared in all five answers. Tomorrow.io was mentioned in four out of five: in all three ChatGPT answers and in one of the two Google AI Overviews. Open-Meteo was listed before Tomorrow.io in four out of five answers.

Most recommended by AI

Brands get a higher ranking if they are mentioned earlier in the answers.

  1. Open-Meteo1st
  2. WeatherAPI2nd
  3. OpenWeather3rd
  4. Tomorrow.io4th
  5. Visual Crossing5th
  6. AccuWeather6th

Mentioned by AI

Each dot is one answer, filled in when that answer mentions the brand.

  • Open-Meteo5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • WeatherAPI4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Tomorrow.io4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Visual Crossing4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • OpenWeather3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • AccuWeather1 of 5Named in 0 of 3 ChatGPT answersNamed in 1 of 2 Google answers

See every answer about weather APIs

5 answers

Brands are shown in the order each answer named them. The survey took place in the United States on October 19, 2026.

Is Open-Meteo or Tomorrow.io more popular in search?

This chart shows how often people search Google for Open-Meteo and Tomorrow.io by name. Each line represents a brand's share of searches for all six weather APIs we track, month by month, from English-language searches worldwide.

Open-Meteo and Tomorrow.io among weather APIs worldwide, by month

Share of searches by month for Open-Meteo, Tomorrow.io. The figures are in the table below the chart.

View monthly share of searches table
MonthAccuWeatherOpen-MeteoWeatherAPIOpenWeatherTomorrow.ioVisual Crossing
Oct 202598.4%0.38%0.65%0.44%0.05%0.05%
Nov 202598%0.54%0.79%0.53%0.07%0.06%
Dec 202598.6%0.36%0.53%0.44%0.06%0.04%
Jan 202698.9%0.3%0.44%0.29%0.04%0.04%
Feb 202698%0.64%0.65%0.53%0.11%0.06%
Mar 202698.1%0.64%0.65%0.53%0.07%0.05%
Apr 202698.2%0.66%0.53%0.53%0.06%0.05%
May 202698.5%0.54%0.44%0.44%0.06%0.04%
Jun 202698.6%0.54%0.44%0.36%0.05%0.03%
Jul 202698.6%0.52%0.44%0.36%0.04%0.03%
Aug 202698.7%0.52%0.36%0.36%0.04%0.03%
Sep 202698.4%0.66%0.44%0.36%0.07%0.04%

How has the Open-Meteo and Tomorrow.io comparison changed over the last 12 months?

3 findings
  • Open-Meteo was ahead of Tomorrow.io in every measured month of the 12 months ending September 2026.
  • Across the 12 months ending September 2026, Open-Meteo’s share of searches among weather APIs worldwide moved from 0.38% to 0.66%, and its estimated monthly branded searches moved from 23.5K to 41.2K.
  • Across the 12 months ending September 2026, Tomorrow.io’s share of searches among weather APIs worldwide moved from 0.05% to 0.07%, and its estimated monthly branded searches moved from 3K to 4.5K.

How did search popularity change for weather APIs worldwide in September 2026?

2 changes

  1. Estimated monthly branded searches for Open-Meteo worldwide rose 75.3% over 12 measured months, from 23.5K to 41.2K in September 2026.

  2. Estimated monthly branded searches for Tomorrow.io worldwide rose 48.8% over 12 measured months, from 3K to 4.5K in September 2026.

How are branded searches counted?

4 search terms

Brandwave collects information about searches that people make online using Open-Meteo’s and Tomorrow.io’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.

Open-Meteo

2 branded search terms

  • open meteo
  • openmeteo

Tomorrow.io

2 branded search terms

  • tomorrow io
  • tomorrowio

How the Brand Demand Index is measured

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