Open-Meteo

Open-Meteo Weather API

Open-source weather API providing forecasts, current conditions, and historical data for any coordinate worldwide. No authentication required.

Data Model

• Current Weather — Temperature, wind speed/direction, weather code, and day/night flag. Updated every 15 minutes.
• Hourly Forecast — Up to 16 days of hourly temperature, precipitation, humidity, wind, cloud cover, and more.
• Daily Forecast — Up to 16 days of daily min/max temperature, sunrise/sunset, precipitation sum, and dominant wind.

Weather Codes (WMO)

• 0: Clear sky, 1-3: Mainly clear/partly cloudy/overcast
• 45/48: Fog/rime fog, 51-57: Drizzle (light/moderate/dense)
• 61-67: Rain (slight/moderate/heavy), freezing rain
• 71-77: Snow (slight/moderate/heavy), snow grains
• 80-82: Rain showers, 85-86: Snow showers
• 95/96/99: Thunderstorm, with hail

Key Parameters

• Hourly variables: temperature_2m, relative_humidity_2m, precipitation, rain, snowfall, wind_speed_10m, wind_direction_10m, cloud_cover, pressure_msl, visibility, uv_index
• Daily variables: temperature_2m_max, temperature_2m_min, sunrise, sunset, precipitation_sum, rain_sum, wind_speed_10m_max, uv_index_max

Gotchas

• Coordinates: Use decimal latitude/longitude (e.g. London: 51.5074, -0.1278).
• Timezone: Defaults to UTC. Pass timezone=auto to get local timezone.
• Forecast days: Default 7, maximum 16. Historical data via separate archive API.
• Units: Temperature in °C, wind in km/h, precipitation in mm by default.