Accurate weather forecasts using Open-Meto API (no key required)

Fetch current weather conditions and 7-day daily forecasts for any location using the Open-Meteo API. Includes geocoding to resolve city names to coordinates. Free, no API key required.

Open-Meteo Weather

Current weather conditions and 7-day daily forecasts for any location. Uses the free Open-Meteo API with built-in geocoding. No API key, no authentication, no rate limits for non-commercial use.

Quick Reference

Action	Endpoint
Geocode city to lat/lon	GET https://geocoding-api.open-meteo.com/v1/search?name={city}&count=1&language=en
Current + 7-day forecast	GET https://api.open-meteo.com/v1/forecast?latitude={lat}&longitude={lon}&current=temperature_2m,relative_humidity_2m,apparent_temperature,weather_code,wind_speed_10m,wind_direction_10m,precipitation&daily=temperature_2m_max,temperature_2m_min,precipitation_sum,precipitation_probability_max,sunrise,sunset,wind_speed_10m_max,weather_code&timezone=auto

Units

Default to metric. On the first weather request in a session, ask the user: "Do you prefer Celsius or Fahrenheit?" Remember their answer for the rest of the session.

For metric (default), no extra parameters needed.

For imperial, append these parameters to the forecast URL:

&temperature_unit=fahrenheit&wind_speed_unit=mph&precipitation_unit=inch

The response current_units and daily_units objects reflect the chosen system.

Geocoding

Resolve a city name to latitude/longitude before calling the forecast API.

Endpoint: GET https://geocoding-api.open-meteo.com/v1/search

Parameter	Required	Description
name	Yes	City name (minimum 2 characters)
count	No	Number of results (default 10, max 100). Use 1 for best match.
language	No	Response language (default en)

Example:

curl "https://geocoding-api.open-meteo.com/v1/search?name=Berlin&count=1&language=en"

Extract from the response:

Field	Description
results[0].latitude	Latitude (WGS84)
results[0].longitude	Longitude (WGS84)
results[0].name	Resolved city name
results[0].country	Country name
results[0].admin1	State/province

If results is empty or missing, tell the user the location was not found and ask them to be more specific.

If multiple cities share the same name, use count=5 and present the options (name, admin1, country) so the user can pick the right one.

Current Conditions

Include the current parameter in the forecast call.

Parameters to request:

current=temperature_2m,relative_humidity_2m,apparent_temperature,weather_code,wind_speed_10m,wind_direction_10m,precipitation

Response fields:

Field	Description
current.temperature_2m	Temperature at 2m height
current.apparent_temperature	Feels-like temperature (wind chill / heat index)
current.relative_humidity_2m	Relative humidity percentage
current.weather_code	WMO code (see Weather Codes below)
current.wind_speed_10m	Wind speed at 10m height
current.wind_direction_10m	Wind direction in degrees
current.precipitation	Precipitation in the last hour

Units are in the current_units object. Always include the unit when presenting values.

Convert wind_direction_10m degrees to the nearest compass direction: N (338-22), NE (23-67), E (68-112), SE (113-157), S (158-202), SW (203-247), W (248-292), NW (293-337).

Daily Forecast

Include the daily parameter. Always add timezone=auto so times are in the location's local timezone.

Parameters to request:

daily=temperature_2m_max,temperature_2m_min,precipitation_sum,precipitation_probability_max,sunrise,sunset,wind_speed_10m_max,weather_code&timezone=auto

All daily fields are arrays indexed by day. daily.time contains date strings (YYYY-MM-DD).

Field	Description
daily.time[i]	Date
daily.weather_code[i]	WMO code for the day
daily.temperature_2m_max[i]	High temperature
daily.temperature_2m_min[i]	Low temperature
daily.precipitation_sum[i]	Total precipitation
daily.precipitation_probability_max[i]	Max precipitation probability (%)
daily.sunrise[i]	Sunrise time (ISO 8601, local)
daily.sunset[i]	Sunset time (ISO 8601, local)
daily.wind_speed_10m_max[i]	Max wind speed

Weather Codes

WMO weather interpretation codes returned in weather_code fields:

Code	Description
0	Clear sky
1	Mainly clear
2	Partly cloudy
3	Overcast
45	Fog
48	Depositing rime fog
51	Light drizzle
53	Moderate drizzle
55	Dense drizzle
56	Light freezing drizzle
57	Dense freezing drizzle
61	Slight rain
63	Moderate rain
65	Heavy rain
66	Light freezing rain
67	Heavy freezing rain
71	Slight snow
73	Moderate snow
75	Heavy snow
77	Snow grains
80	Slight rain showers
81	Moderate rain showers
82	Violent rain showers
85	Slight snow showers
86	Heavy snow showers
95	Thunderstorm
96	Thunderstorm with slight hail
99	Thunderstorm with heavy hail

Use the description when presenting weather to the user. Do NOT show the numeric code.

Response Formatting

Present a concise summary. Do NOT show raw JSON, API URLs, or technical details.

Current conditions format:

Weather in {city}, {country}
{weather description}, {temperature} (feels like {apparent_temperature})
Humidity: {humidity}%
Wind: {speed} from the {compass_direction}
Precipitation: {amount}

Forecast format:

After current conditions, show the 7-day outlook as a compact list with one line per day:

Mon Feb 24: Partly cloudy, 8/3C, 10% rain, wind 15 km/h
Tue Feb 25: Rain, 6/2C, 80% rain, 4.2mm, wind 25 km/h

If the user asks a specific question ("Will it rain tomorrow?", "What's the temperature on Friday?"), answer directly instead of showing the full forecast.

Error Handling

If any API call returns a non-200 status or the response cannot be parsed, inform the user that the weather service is temporarily unavailable and suggest trying again in a few minutes. Do NOT show raw error messages or status codes.