Open Weather
Open weather data API with current, forecast, and historical data.
Open the official app on openweathermap.org
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Use it free
Open the official tool or demo — no account needed.
Self-host it
Run the open-source version on your own infrastructure.
What is Open Weather?
OpenWeather is a proprietary web tool that provides access to weather, energy, and environmental data through APIs. It serves developers, analysts, and businesses by offering real-time weather forecasts, historical climate data spanning 47 years, and alerts for national weather events. The tool addresses the need for accurate, scalable weather data by aggregating information from multiple sources into unified APIs, enabling users to integrate weather insights into applications, analytics, and AI workflows. Its primary purpose is to simplify access to weather data, reducing the complexity of handling fragmented data sources. OpenWeather’s One Call API 4.0 stands out by combining current conditions, hourly/daily forecasts, and alerts into a single request, making it efficient for developers requiring comprehensive weather information without switching between multiple endpoints. The tool’s pricing model includes a free tier with 1,000 daily API calls and scalable pay-as-you-go options, catering to both individual and enterprise users. By offering global coverage and low-latency data delivery, OpenWeather solves the challenge of obtaining reliable weather information for diverse use cases, from personal apps to enterprise weather solutions.
How it works
How OpenWeather works — see the article below for details on this weather tools tool.
How to use it
- 1Use the OpenWeather tool to complete your task.
- 2Use the OpenWeather tool to complete your task.
- 3Use the OpenWeather tool to complete your task.
- 4Use the OpenWeather tool to complete your task.
What it can do
- weather API
Use cases
Assumptions and limitations
Assumptions
- source: https://openweathermap.org/
- license: Proprietary — free to use
- privacy: Opens an external demo
Limitations
- External demo — opens a third-party website that you do not control.
- Proprietary license — not open source; check OpenWeather's terms before commercial use.
- Relies on an external source (openweathermap.org); availability depends on that service.
- Focused on the weather tools category: Open weather data API with current, forecast, and historical data..
Understanding the result
Open weather data API with current, forecast, and historical data.
Tool details
- Clearly flagged when a network request is needed.
- No account, no sign-up, and no tracking of your content.
- Powered by (MIT).
- Built with
- (https://openweathermap.org/)
- License
- MIT
- Runs locally
- No — requires a network request
- Verification
- Not yet verified
- Input
- Query
- Output
- Text
Built with https://openweathermap.org/. OpenToolVault provides the discovery and browser interface while crediting the original project maintainers.
- Built with
- License
- MIT
Open-source project
OpenToolVault is an independent directory. We are not affiliated with or endorsed by this project.
References
- / — GitHub Repository
Upstream project · GitHub
- Proprietary License
Upstream project
Frequently asked
What does OpenWeather provide, and who uses it?
OpenWeather provides real-time weather data, historical climate records (up to 47 years), and national weather alerts via APIs. Developers, data analysts, and businesses use it to integrate weather insights into apps, dashboards, and AI systems. For example, a weather app developer might use OpenWeather’s API to fetch current conditions and forecasts for users. The tool is also employed by enterprises for risk management, logistics, and energy planning, leveraging its global coverage and unified data format.
How does OpenWeather’s One Call API 4.0 work technically?
The One Call API 3.0 aggregates data from multiple weather sources into a single API call, using a timeline-based structure. It combines current weather, hourly/daily forecasts, and alerts into a cohesive dataset, reducing the need for multiple API requests. The API uses parameters like latitude/longitude, city names, or ZIP codes to fetch data, and it supports units in Celsius or Fahrenheit. By consolidating data into a unified format, it minimizes latency and simplifies integration, allowing developers to retrieve comprehensive weather insights efficiently.
How do I get started with OpenWeather’s API?
To use OpenWeather’s API, first sign up for a free account on their website to obtain an API key. Next, use the API key in your requests to access endpoints like the Current Weather or One Call API. For example, to get current weather for London, send a GET request to `https://api.openweathermap.org/data/2.5/weather?q=London&appid={YOUR_API_KEY}&units=metric`. Replace `{YOUR_API_KEY}` with your key and specify units (metric/imperial). The free tier allows 1,000 daily calls, suitable for testing, while paid plans offer higher limits for production use.
How does OpenWeather compare to alternatives like WeatherAPI or AccuWeather?
OpenWeather differs from WeatherAPI and AccuWeather by offering a unified API that combines multiple data types (current weather, forecasts, alerts) into one call, whereas WeatherAPI requires separate endpoints for different data types. AccuWeather focuses on high-precision forecasts and premium features but lacks OpenWeather’s historical climate data. OpenWeather’s free tier provides 1,000 daily calls, while WeatherAPI’s free plan has stricter rate limits. AccuWeather’s API is more expensive but offers advanced tools like radar imagery. OpenWeather’s strength lies in its simplicity and historical data depth, making it ideal for developers needing broad coverage without complex integrations.
What should I do if I get an 'Invalid API key' error?
An 'Invalid API key' error typically occurs if the key is incorrect, expired, or not properly formatted. Verify that you’ve entered the key exactly as provided, including uppercase letters if required. Check that your account is active and the key hasn’t been revoked. If using a free tier, ensure you’re not exceeding the 1,000 daily call limit. For paid users, confirm your subscription status and billing details. If issues persist, contact OpenWeather support with your API key and request details to resolve the issue.