Getting started overview

Open-Meteo offers a suite of weather APIs designed for developers seeking cost-effective and straightforward access to meteorological data. This guide focuses on the essential steps to get started, from account creation to making your initial API request. Unlike many other API providers, Open-Meteo's free tier does not require an API key, streamlining the onboarding process for new users. This design choice aims to minimize friction and allow developers to quickly integrate weather data into their applications for personal projects, educational use, and small-scale applications.

The core philosophy behind Open-Meteo emphasizes simplicity and accessibility, providing clear documentation and examples across multiple programming languages. The platform's free tier supports up to 10,000 requests per day, making it suitable for initial development and testing without immediate financial commitment. For increased request volumes, paid plans are available, starting at €4.99 per month for 20,000 requests daily, as detailed on the Open-Meteo pricing page. This structure enables developers to scale their usage as their project requirements evolve.

Before proceeding, ensure you have a basic understanding of HTTP GET requests and how to execute them from your preferred programming environment. The examples provided will primarily use curl for demonstration purposes, which is a common command-line tool for transferring data with URLs, as described in the curl documentation.

Create an account and get keys

Open-Meteo distinguishes itself by not requiring an API key for its free tier. This means you can often proceed directly to making requests without a formal signup process if your usage falls within the free tier limits. However, creating an account is still recommended for several reasons:

  • Access to advanced features: While not strictly necessary for basic requests, an account may be required for future premium features or higher request limits.
  • Usage monitoring: An account could provide a dashboard to monitor your API usage, helping you stay within the free tier limits or manage paid plan consumption.
  • Support and community: Registered users may have better access to support resources or community forums, though Open-Meteo's primary support is often via their documentation.

Steps for account creation (if desired or for paid plans):

  1. Navigate to the Open-Meteo homepage.
  2. Look for a "Sign Up" or "Register" option. As of 2026, Open-Meteo's free tier does not typically require an explicit account creation for basic API access, but this may change for paid tiers or specific services.
  3. If a registration option is present, follow the prompts to create your account, which usually involves providing an email address and setting a password.
  4. Verify your email address if prompted.

For the free tier, API keys are not issued or required. Requests are made directly to the API endpoints. If you decide to upgrade to a paid plan, a subscription process on the Open-Meteo pricing page would typically provision access tokens or API keys associated with your account, which would then be used for authentication. Always refer to the most current Open-Meteo documentation for the latest authentication procedures.

Your first request

Making your first request with Open-Meteo involves constructing a simple HTTP GET request to one of their API endpoints. The primary endpoint for weather forecasts is commonly used for initial testing. This section will guide you through constructing a request to retrieve a basic weather forecast for a specific location.

Key parameters for a basic forecast request:

  • latitude: The geographical latitude of the location.
  • longitude: The geographical longitude of the location.
  • hourly: Specifies the hourly weather variables to retrieve (e.g., temperature_2m, rain).
  • forecast_days: The number of days to forecast (e.g., 1 for today).

Example: Current temperature for Berlin

Let's retrieve the current 2-meter temperature for Berlin, Germany. Berlin's approximate coordinates are latitude 52.52 and longitude 13.41.

Using curl:

curl "https://api.open-meteo.com/v1/forecast?latitude=52.52&longitude=13.41&hourly=temperature_2m&forecast_days=1"

This curl command will send an HTTP GET request to the Open-Meteo forecast endpoint with the specified parameters. The response will be in JSON format, containing hourly temperature data for Berlin for one day.

Expected JSON response structure (abbreviated):

{
  "latitude": 52.52,
  "longitude": 13.409996,
  "generationtime_ms": 0.19800662994384766,
  "utc_offset_seconds": 0,
  "timezone": "Europe/Berlin",
  "timezone_abbreviation": "CEST",
  "elevation": 38.0,
  "hourly_units": {
    "time": "iso8601",
    "temperature_2m": "°C"
  },
  "hourly": {
    "time": [
      "2026-05-29T00:00",
      "2026-05-29T01:00",
      // ... more hourly timestamps ...
    ],
    "temperature_2m": [
      10.1,
      9.8,
      // ... more hourly temperatures ...
    ]
  }
}

The hourly object contains two arrays: time (ISO 8601 formatted timestamps) and temperature_2m (corresponding temperatures in Celsius). You can parse this JSON response in your application to extract the desired weather information.

Quick Reference: Getting Started Steps

This table provides a concise overview of the steps to get started with Open-Meteo:

Step What to Do Where to Find Info
1. Understand API Review Open-Meteo's core offerings and free tier limits. Open-Meteo Documentation
2. Account Setup Decide if an account is needed (optional for free tier, required for paid). Open-Meteo Docs (no direct signup link for free tier)
3. Construct Request Identify necessary parameters (latitude, longitude, variables). API Reference
4. Execute Request Use curl or your preferred HTTP client. Code Examples
5. Parse Response Process the JSON output in your application. MDN JSON.parse() documentation (for JavaScript)

Common next steps

Once you have successfully made your first API request and parsed the response, you can explore various ways to integrate Open-Meteo data more deeply into your applications. Here are some common next steps:

Explore more API endpoints and variables

Open-Meteo offers several specialized APIs beyond the basic forecast. Depending on your project's needs, you might investigate:

  • Historical Weather API: For retrieving past weather data, useful for analysis or training models.
  • Marine Weather API: Provides specific data for oceanic conditions, such as wave height and direction.
  • Air Quality API: Offers data on pollutants and air quality indices.
  • Elevation API: Returns the elevation for given coordinates, which can influence local weather patterns.

Each of these APIs has its own set of parameters and variables. Consult the Open-Meteo API documentation for a comprehensive list.

Implement error handling

Robust applications should always include error handling. The Open-Meteo API will return specific HTTP status codes and JSON error messages for invalid requests or server issues. For example, a 400 Bad Request status code might indicate missing or incorrect parameters. Your application should be prepared to gracefully handle these responses, perhaps by logging the error or providing user feedback.

Integrate into your application framework

Instead of just using curl, you'll want to integrate API calls into your chosen programming language or framework. Open-Meteo provides code examples in Python, Node.js, PHP, Java, Go, R, and Ruby. Leverage these examples to incorporate the API calls into your backend services, frontend applications, or data analysis scripts.

Manage API usage and scaling

Keep track of your API request volume. If your application grows, you may exceed the free tier's 10,000 requests per day. At this point, consider upgrading to a paid plan. Paid plans offer higher request limits and potentially dedicated support. Monitoring your usage helps prevent service interruptions due to rate limits.

Troubleshooting the first call

When making your first API call, you might encounter issues. Here are common problems and their solutions:

Incorrect URL or parameters

  • Problem: The URL is malformed, or required parameters (like latitude and longitude) are missing or incorrectly formatted.
  • Solution: Double-check the URL against the Open-Meteo API documentation for parameters. Ensure all query parameters are correctly separated by & and values are URL-encoded if necessary, though common values like numbers usually don't need it.

Network connectivity issues

  • Problem: Your client (e.g., curl, browser) cannot reach the Open-Meteo server.
  • Solution: Verify your internet connection. Try pinging api.open-meteo.com to ensure the domain resolves and is reachable. Check for any firewall or proxy settings that might be blocking outbound HTTP requests.

Invalid or unexpected JSON response

  • Problem: The API returns an error message in JSON, or the JSON structure is not what you expect.
  • Solution: Read the error message carefully. Open-Meteo's API typically provides descriptive error messages within the JSON response if the request was syntactically valid but semantically incorrect (e.g., out-of-range coordinates). Use a JSON formatter or validator to inspect the response structure.

Rate limiting

  • Problem: You receive an error indicating you've exceeded your request limit.
  • Solution: For the free tier, the limit is 10,000 requests per day. If you hit this, you'll need to wait for the limit to reset or consider upgrading to a paid plan. Implement client-side rate limiting or caching strategies to reduce the number of requests your application makes.

Timezone and UTC offset discrepancies

  • Problem: The time data in the response doesn't match your local time expectations.
  • Solution: The API typically returns time in UTC by default, and also provides timezone and utc_offset_seconds in the response. Account for these when converting timestamps to your local timezone or displaying them to users. You can also specify a timezone parameter in your request to get data in a specific timezone, as outlined in the Open-Meteo timezone documentation.