RainViewer Getting Started: API Keys & First Request (2026)

Getting started overview

Integrating with the RainViewer API involves a series of steps designed to provide access to real-time and historical weather radar data. This guide focuses on the initial setup, including account registration, API key acquisition, and the execution of a basic API call. The RainViewer API offers data points such as precipitation and lightning, enabling developers to incorporate weather visualization and alerting capabilities into their applications. The process is supported by documentation that includes code examples in various programming languages, facilitating integration for different development environments RainViewer API methods documentation.

Before making requests, developers must sign up for an account and obtain an API key. This key authenticates requests and manages access according to the user's subscription plan. RainViewer provides a free Developer Plan, which includes 5,000 requests per day, suitable for testing and development purposes RainViewer API pricing details. Paid plans offer increased request limits, higher resolution data, and additional features like lightning data.

The following table summarizes the key steps to get started:

Create an account and get keys

To begin using the RainViewer API, a developer account is required. This account serves as the central point for managing API keys, monitoring usage, and accessing subscription details. The registration process typically involves providing an email address and creating a password. Once registered, users gain access to the RainViewer developer dashboard.

1. Navigate to the RainViewer API documentation: Start by visiting the official RainViewer API documentation page.
2. Sign up for an account: Look for a 'Sign Up' or 'Get API Key' button. This will lead to the registration form. Complete the required fields, which usually include an email address and a password.
3. Verify your email: After registration, RainViewer may send a verification email. Follow the instructions in the email to activate your account.
4. Access the developer dashboard: Once verified, log in to your RainViewer account. The developer dashboard is where you will find your API key.
5. Locate your API key: Within the dashboard, there will typically be a section labeled 'API Keys' or 'Credentials'. Your unique API key will be displayed there. This key is essential for authenticating all your API requests. It is critical to keep this key secure and avoid exposing it in client-side code or public repositories.

The API key acts as a unique identifier and authenticator for your application. It should be included in every API request, usually as a query parameter or an HTTP header, depending on the specific endpoint's requirements. For security best practices, consider using environment variables for storing API keys in development and secure secret management services in production Google Cloud API key best practices.

Your first request

After obtaining your API key, the next step is to make your first API request to confirm everything is set up correctly. A common starting point is to fetch the latest radar images. The RainViewer API typically provides endpoints for retrieving radar data, often requiring geographical coordinates (latitude and longitude) and your API key.

Here's an example using the /maps/times endpoint to get available radar times, which is a prerequisite for fetching specific radar images:

Example: Get available radar times

This request retrieves a list of available radar timestamps. You will need your API key.

GET https://api.rainviewer.com/public/maps/times?key=YOUR_API_KEY

Replace YOUR_API_KEY with the actual key obtained from your RainViewer dashboard. If successful, the API will return a JSON array of Unix timestamps, representing the times for which radar data is available.

Example: Fetching radar data for a specific time and location

Once you have a timestamp, you can request radar data for a specific location. Let's assume you want data for New York City (latitude 40.7128, longitude -74.0060) and a recent timestamp. The RainViewer API often uses a tile-based system similar to other mapping services ArcGIS Map Tile Data overview.

First, get the latest radar time:

async function getLatestRadarTime(apiKey) {
  const response = await fetch(`https://api.rainviewer.com/public/maps/times?key=${apiKey}`);
  const times = await response.json();
  return times[times.length - 1]; // Get the latest timestamp
}

// Example usage:
// const apiKey = 'YOUR_API_KEY';
// getLatestRadarTime(apiKey).then(latestTime => console.log('Latest radar time:', latestTime));

Next, construct the URL for a radar tile. RainViewer's documentation specifies how to build these URLs, often involving a base URL, the timestamp, and XYZ tile coordinates RainViewer API radar methods. For demonstration, we'll use a conceptual tile URL structure. The actual tile coordinates (X, Y, Z) would depend on the desired zoom level and geographical area.

GET https://tile.rainviewer.com/v2/radar/TIMESTAMP/256/ZOOM/X/Y/COLOR_SCHEME/OPTIONS.png?key=YOUR_API_KEY

In this conceptual example:

• TIMESTAMP: A Unix timestamp obtained from the /maps/times endpoint.
• ZOOM, X, Y: Map tile coordinates. For a quick test, you might use common values or generate them for a specific location.
• COLOR_SCHEME: A numerical identifier for the color palette (e.g., 0-7).
• OPTIONS: Additional parameters like smooth or snow.
• YOUR_API_KEY: Your RainViewer API key.

For instance, to get a radar image for a specific time (e.g., 1678886400) at zoom level 6, tile X=32, Y=24, with color scheme 0:

GET https://tile.rainviewer.com/v2/radar/1678886400/256/6/32/24/0/0.png?key=YOUR_API_KEY

Executing this request (e.g., in a browser, Postman, or a simple script) should return a PNG image of the radar data. This confirms that your API key is valid and you can successfully retrieve data from the RainViewer API.

Common next steps

After successfully making your first API call, consider these common next steps to further integrate RainViewer into your application:

1. Explore additional API endpoints: The RainViewer API offers various endpoints beyond basic radar tiles. Investigate options for historical radar data, lightning data, or forecast information, as detailed in the RainViewer API methods documentation.
2. Implement client-side mapping: For visualizing radar data, integrate the fetched tiles into a mapping library such as Leaflet or Google Maps. This involves setting up a tile layer that uses the RainViewer tile URLs.
3. Error handling: Implement robust error handling in your application to gracefully manage API rate limits, invalid requests, or network issues. Pay attention to HTTP status codes and API-specific error messages.
4. Monitor usage: Regularly check your API usage within the RainViewer developer dashboard to stay within your plan's limits and anticipate when an upgrade might be necessary.
5. Secure your API key: Ensure your API key is never exposed in client-side code or public repositories. Use environment variables for development and secure secret management systems for production deployments.
6. Review pricing and scale: If your application's usage grows, review the RainViewer API pricing details to understand the different plans and features available for scaling your integration.
7. Explore SDKs or libraries: While RainViewer does not list official SDKs, community-contributed libraries might exist for specific programming languages, which can simplify API interaction.

Troubleshooting the first call

Encountering issues during your first API call is common. Here are some troubleshooting steps:

• Check API Key: Double-check that your API key is correct and included in the request. A common mistake is a typo or an incomplete key. Ensure it's passed exactly as specified in the RainViewer documentation, typically as a query parameter named key.
• Verify Endpoint URL: Confirm that the API endpoint URL is accurate. Any deviation from the documented URL can result in a 404 Not Found error. Refer to the RainViewer API methods documentation for exact endpoint paths.
• Review Request Parameters: Ensure all required parameters (like timestamp, zoom, X, Y for tile requests) are present and correctly formatted. Incorrect data types or missing parameters can lead to errors.
• Inspect HTTP Status Codes:
• 400 Bad Request: Often indicates missing or malformed parameters.
• 401 Unauthorized: Typically means the API key is missing or invalid.
• 403 Forbidden: Could mean your API key does not have permission for the requested resource, or you've exceeded rate limits.
• 404 Not Found: The requested resource (e.g., a specific tile or endpoint) does not exist, or the URL is incorrect.
• 429 Too Many Requests: You have exceeded the rate limit for your current plan.
• Check Network Connectivity: Verify that your development environment has an active internet connection and is not blocked by a firewall from accessing api.rainviewer.com or tile.rainviewer.com.
• Consult Documentation: The RainViewer API documentation provides detailed explanations of endpoints, parameters, and potential error responses. It's often the quickest way to resolve specific issues RainViewer API documentation.
• Test with a Simple Tool: Use a tool like Postman, curl, or a web browser to make a simple GET request with your API key. This can help isolate whether the issue is with your code or the API key/account setup.
• Review Rate Limits: If you are on the free Developer Plan, be mindful of the 5,000 requests/day limit. Hitting this limit will result in 429 Too Many Requests errors.