How to Get Started With the Free Open-Meteo Weather API

What Open-Meteo is and why you might use it

Open-Meteo is a free weather data service that lets you pull current conditions, forecasts, and historical weather into your own website or application. You do not need to pay anything, sign a contract, or get approval from a company — you can start using it within minutes. The service works by sending a simple web request to Open-Meteo's servers, which send back weather data in a format your code can read and use.

Developers use Open-Meteo when they are building weather apps, websites that display local conditions, or tools that need historical temperature and rainfall data. Because there is no account requirement and no rate limits for reasonable use, it is one of the lowest-friction ways to add weather information to a project.

The tradeoff is that Open-Meteo does not offer phone support or a dedicated account manager. If something breaks, you troubleshoot it yourself or ask in their community channels. For personal projects, school assignments, and small business websites, this is usually fine. For mission-critical systems, you might want a paid weather service with guarantees.

Key Takeaways

Open-Meteo requires no account, no API key, and no signup process — you can make your first weather request immediately by copying a URL into your browser.
The service returns weather data in JSON format, which is readable by every modern programming language and most spreadsheet tools.
You can request current conditions, hourly forecasts, daily forecasts, or historical data by changing the parameters in your request URL.
Open-Meteo has no official rate limits for personal and research use, but the service asks that you do not hammer their servers with thousands of requests per second.
If you need to use Open-Meteo in a commercial product or at very high volume, you should read their terms and consider their paid tier.

Making your first weather request without any setup

The fastest way to see Open-Meteo in action is to paste a URL directly into your browser. Open a new tab and go to this address:

https://api.open-meteo.com/v1/forecast?latitude=40.7128&longitude=-74.0060¤t=temperature_2m,weather_code

This request asks for the current temperature and weather condition at latitude 40.7128, longitude -74.0060 (New York City). When you press Enter, your browser will display a block of text that looks like this:

{"latitude":40.7128,"longitude":-74.006,"generationtime_ms":0.123,"utc_offset_seconds":0,"timezone":"America/New_York","timezone_abbreviation":"EST","elevation":10.0,"current":{"time":"2024-01-15T14:30","interval":1800,"temperature_2m":42.5,"weather_code":80}}

That block is JSON — a standard format for sending data across the internet. The numbers and text inside tell you the temperature (42.5 degrees), the location, and the time the data was recorded. You have just made your first API request without writing any code, installing anything, or creating an account.

Understanding the URL structure and changing what data you get

Every Open-Meteo request follows the same pattern: a base URL, a location (latitude and longitude), and a list of the data you want. Breaking down the example above:

https://api.open-meteo.com/v1/forecast is the base address. latitude=40.7128&longitude=-74.0060 tells Open-Meteo where you want weather for. current=temperature_2m,weather_code says you want the current temperature and weather condition.

To get different data, you change what comes after current=. If you want humidity and wind speed instead, you would write current=temperature_2m,relative_humidity_2m,wind_speed_10m. If you want a forecast for the next seven days, you add &daily=temperature_2m_max,temperature_2m_min,precipitation_sum to the end of the URL.

Finding the right parameter names takes a few minutes of reading the Open-Meteo documentation, but the pattern is always the same: pick what you want, separate multiple items with commas, and add them to the URL. Open-Meteo will either return the data or tell you the parameter name is wrong.

Getting latitude and longitude for any location

The hardest part of using Open-Meteo is usually finding the latitude and longitude of the place you care about. You have several options.

The simplest is to use Google Maps. Search for the location, right-click on the pin, and select "What's here?" — Google will show you the coordinates at the bottom of the screen. Copy the latitude (the first number) and longitude (the second number) into your Open-Meteo URL.

If you are building something that needs to work for many locations, you can use a geocoding API — a service that converts a place name like "Denver, Colorado" into latitude and longitude automatically. Open-Meteo itself offers a free geocoding service at https://geocoding-api.open-meteo.com/v1/search?name=Denver&count=1&language=en&format=json. Paste that URL into your browser and it will return the coordinates for Denver.

Using Open-Meteo data in a spreadsheet or simple website

If you are not a programmer, you can still use Open-Meteo data in a spreadsheet. In Google Sheets, use the =IMPORTDATA() function to pull weather data directly into a cell. Type this formula into a cell:

=IMPORTDATA("https://api.open-meteo.com/v1/forecast?latitude=40.7128&longitude=-74.0060¤t=temperature_2m")

Google Sheets will fetch the data and display it as a table. You can then use spreadsheet formulas to extract just the temperature number or format it however you need.

For a simple website, you can use JavaScript — the programming language that runs in web browsers. Write a few lines of code that fetch the weather data when the page loads, then display it on the page. Most beginner JavaScript tutorials include an example of fetching data from an API, and Open-Meteo works exactly the same way.

Understanding rate limits and when you might hit them

Open-Meteo does not enforce strict rate limits for personal, research, and non-commercial use. You can make hundreds of requests per day without running into problems. However, the service does ask that you not send thousands of requests per second, which would slow down the service for everyone else.

If you are building a commercial product — something you sell or use to make money — you should read Open-Meteo's terms of service. They offer a paid tier for high-volume commercial use, which gives you may provide uptime and priority support. For a hobby project or school assignment, the free tier is fine.

If your code accidentally enters a loop and sends thousands of requests in a few seconds, Open-Meteo may temporarily block your IP address. This is rare and usually resolves within an hour. If it happens, check your code for bugs — usually a loop that is not exiting properly.

Troubleshooting common problems

If you paste a URL into your browser and see an error message instead of weather data, the most common cause is a typo in the latitude or longitude. Double-check that both numbers are present and separated by an ampersand (&). If the numbers are correct, try a different location to confirm the service is working.

If you are using Open-Meteo in code and the data is not showing up on your website or app, check that your code is actually making the request. Most programming languages require you to explicitly tell them to fetch data from a URL — it does not happen automatically. Open a browser developer console (press F12 on most computers) and look for error messages. They usually point you to the exact line of code that is broken.

If you need help, Open-Meteo has a community forum and a GitHub repository where other developers answer questions. Search for your problem there before posting — someone has probably already solved it.

Frequently Asked Questions

Do I need an API key to use Open-Meteo?

No. Open-Meteo does not require an API key, account, or any signup process. You can start making requests immediately by pasting a URL into your browser or writing code that fetches from their servers.

What programming languages can I use with Open-Meteo?

Any language that can make web requests and read JSON can use Open-Meteo. This includes Python, JavaScript, Java, C#, PHP, Ruby, Go, and dozens of others. The language does not matter — Open-Meteo returns the same data format to everyone.

Can I use Open-Meteo on a website that gets a lot of traffic?

Yes, as long as the website is not commercial. If you are running a personal blog or school project that gets thousands of visitors, Open-Meteo can handle it. If you are using the weather data to sell a product or service, you should check their terms and consider their paid tier.

What if Open-Meteo goes down or stops working?

Open-Meteo is maintained by volunteers and has no uptime may provide. For a hobby project, this is usually fine. If you are building something where weather data is critical to your business, use a paid weather service that guarantees availability and offers support.

Can I cache Open-Meteo data so I do not have to request it every time?

Yes, and you should. Weather does not change every second, so store the data locally for 10 or 15 minutes before requesting it again. This reduces load on Open-Meteo's servers and makes your website or app faster for users.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.