modbender 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}¤t=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.