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Comparing Weather API Services: OpenWeatherMap, Meteosource, and Open-Meteo (2025/03/01)

Introduction

This summary compares three popular weather API services - OpenWeatherMap, Meteosource, and Open-Meteo - examining their features, data retrieval processes, authentication requirements, and specific capabilities for retrieving weather data for locations like Los Angeles.

OpenWeatherMap API

Authentication and Endpoints

• Requires an API key for authentication (found under the "API key" tab in your account)

• Primary endpoint: https://api.openweathermap.org/data/2.5/weather

• Can query by coordinates: ?lat={lat}&lon={lon}&appid={API key}

• Legacy methods (deprecated but still functional):

• By city name: ?q={city name}&appid={API key}

• By city ID: ?id={city id}&appid={API key}

• By zip code: ?zip={zip code},{country code}&appid={API key}

Data Parameters

• Required parameters: lat/lon (for coordinate-based queries) or location identifier, and API key

• Optional parameters:

• mode: Response format (xml, html, or JSON by default)

• units: Measurement units (standard, metric, imperial)

• lang: Output language (supports over 30 languages)

Response Format

• JSON format by default

• Contains detailed weather information including:

• Current temperature, feels like, min/max temperature

• Pressure, humidity, visibility

• Wind speed, direction, and gusts

• Cloud coverage

• Precipitation data

• Sunrise/sunset times

• Location details

Meteosource Weather API

Authentication and Endpoints

• Requires authentication (sign-up mentioned but specific authentication method not detailed)

• Provides weather data for specific locations like Los Angeles

Data Structure and Parameters

• Allows queries by place ID or coordinates

• Supports language and unit parameters

• Example request for Los Angeles: json { "place_id": "los-angeles", "language": "en", "unit": "us" }

Response Format

• JSON format with comprehensive weather data:

• Current conditions (temperature, feels like, wind, precipitation, etc.)

• Hourly forecasts

• Daily forecasts with summaries

• Minutely precipitation forecasts

Features

• High-resolution forecasts (1-11 km resolution)

• Specialized weather data for various sectors (energy, insurance, retail, agriculture)

• Historical weather data

• Weather maps and layers

Open-Meteo API

Authentication and Endpoints

• No API key required for non-commercial use

• Example endpoint: https://api.open-meteo.com/v1/forecast

• Query parameters include latitude, longitude, and desired weather variables

Data Parameters

• Primary parameters: latitude and longitude

• Additional parameters to specify which weather variables to retrieve:

• current: For current weather conditions

• hourly: For hourly forecast data

• Historical data available for the past 10 days

Response Format

• JSON format containing requested weather variables

• Example response includes: json { "current": { "time": "2022-01-01T15:00", "temperature_2m": 2.4, "wind_speed_10m": 11.9 }, "hourly": { "time": ["2022-07-01T00:00", "2022-07-01T01:00", ...], "wind_speed_10m": [3.16, 3.02, ...], "temperature_2m": [13.7, 13.3, ...], "relative_humidity_2m": [82, 83, ...] } }

Features

• High-resolution data from multiple weather models (1-11 km)

• Hourly updates for local weather models

• 80 years of historical data available

• Open-source and free for non-commercial use

• No registration required

Comparison of Services

Data Resolution and Coverage

• All three services offer global coverage