free-weather-data

# Free Weather Data API — Open-Meteo & wttr.in

Get current weather, forecasts, and historical weather data using free APIs. No API keys required. Privacy-respecting alternative to paid weather APIs ($5-100/month).

## Why This Replaces Paid Weather APIs

**💰 Cost savings:**
- ✅ **100% free** — no API keys, no rate limits
- ✅ **Comprehensive data** — current, forecast, historical weather
- ✅ **Open source** — Open-Meteo is fully open-source
- ✅ **Privacy-first** — no tracking or data collection

**Perfect for AI agents that need:**
- Weather conditions for location-based decisions
- Forecast data for planning and scheduling
- Historical weather data for analysis
- Weather alerts and monitoring

## Quick comparison

| Service | Cost | Rate limit | API key required | Privacy |
|---------|------|------------|------------------|---------|
| OpenWeatherMap | $0-180/month | 60 calls/min free | ✅ Yes | ❌ Tracked |
| WeatherAPI | $0-70/month | 1M calls/month free | ✅ Yes | ❌ Tracked |
| **Open-Meteo** | **Free** | **10k req/day** | **❌ No** | **✅ Private** |
| **wttr.in** | **Free** | **Unlimited** | **❌ No** | **✅ Private** |

## Skills

### get_current_weather_open_meteo

Get current weather using Open-Meteo (most accurate and comprehensive).

```bash
# Current weather by coordinates
LAT=40.7128
LON=-74.0060

curl -s "https://api.open-meteo.com/v1/forecast?latitude=${LAT}&longitude=${LON}&current=temperature_2m,relative_humidity_2m,apparent_temperature,precipitation,weather_code,wind_speed_10m&temperature_unit=fahrenheit" \
  | jq '{
    temperature: .current.temperature_2m,
    feels_like: .current.apparent_temperature,
    humidity: .current.relative_humidity_2m,
    wind_speed: .current.wind_speed_10m,
    precipitation: .current.precipitation,
    weather_code: .current.weather_code
  }'

# With timezone
curl -s "https://api.open-meteo.com/v1/forecast?latitude=${LAT}&longitude=${LON}&current=temperature_2m,weather_code&timezone=America/New_York" \
  | jq '{temperature: .current.temperature_2m, time: .current.time}'
```

**Node.js:**

```javascript
async function getCurrentWeather(lat, lon, unit = 'fahrenheit') {
  const params = new URLSearchParams({
    latitude: lat.toString(),
    longitude: lon.toString(),
    current: 'temperature_2m,relative_humidity_2m,apparent_temperature,precipitation,weather_code,wind_speed_10m,wind_direction_10m',
    temperature_unit: unit
  });
  
  const res = await fetch(`https://api.open-meteo.com/v1/forecast?${params}`);
  
  if (!res.ok) {
    throw new Error(`Weather API failed: ${res.status}`);
  }
  
  const data = await res.json();
  
  return {
    temperature: data.current.temperature_2m,
    feelsLike: data.current.apparent_temperature,
    humidity: data.current.relative_humidity_2m,
    windSpeed: data.current.wind_speed_10m,
    windDirection: data.current.wind_direction_10m,
    precipitation: data.current.precipitation,
    weatherCode: data.current.weather_code,
    time: data.current.time,
    unit: data.current_units.temperature_2m
  };
}

// Usage
// getCurrentWeather(40.7128, -74.0060, 'fahrenheit')
//   .then(weather => {
//     console.log(`Temperature: ${weather.temperature}°${weather.unit}`);
//     console.log(`Feels like: ${weather.feelsLike}°${weather.unit}`);
//     console.log(`Humidity: ${weather.humidity}%`);
//     console.log(`Wind: ${weather.windSpeed} mph`);
//   });
```

### get_weather_forecast

Get weather forecast for the next 7-16 days.

```bash
# 7-day forecast
LAT=37.7749
LON=-122.4194

curl -s "https://api.open-meteo.com/v1/forecast?latitude=${LAT}&longitude=${LON}&daily=temperature_2m_max,temperature_2m_min,precipitation_sum,weather_code&temperature_unit=fahrenheit&timezone=America/Los_Angeles" \
  | jq '{
    dates: .daily.time,
    max_temp: .daily.temperature_2m_max,
    min_temp: .daily.temperature_2m_min,
    precipitation: .daily.precipitation_sum
  }'

# Hourly forecast for next 24 hours
curl -s "https://api.open-meteo.com/v1/forecast?latitude=${LAT}&longitude=${LON}&hourly=temperature_2m,precipitation,weather_code&forecast_days=1" \
  | jq '{hourly: [.hourly.time, .hourly.temperature_2m, .hourly.precipitation] | transpose | map({time: .[0], temp: .[1], precip: .[2]})}'
```

**Node.js:**

```javascript
async function getWeatherForecast(lat, lon, days = 7, unit = 'fahrenheit') {
  const params = new URLSearchParams({
    latitude: lat.toString(),
    longitude: lon.toString(),
    daily: 'temperature_2m_max,temperature_2m_min,precipitation_sum,precipitation_probability_max,weather_code,wind_speed_10m_max',
    temperature_unit: unit,
    forecast_days: days.toString()
  });
  
  const res = await fetch(`https://api.open-meteo.com/v1/forecast?${params}`);
  
  if (!res.ok) {
    throw new Error(`Forecast API failed: ${res.status}`);
  }
  
  const data = await res.json();
  
  return data.daily.time.map((date, i) => ({
    date,
    maxTemp: data.daily.temperature_2m_max[i],
    minTemp: data.daily.temperature_2m_min[i],
    precipitation: data.daily.precipitation_sum[i],
    precipitationProbability: data.daily.precipitation_probability_max[i],
    maxWindSpeed: data.daily.wind_speed_10m_max[i],
    weatherCode: data.daily.weather_code[i]
  }));
}

// Usage
// getWeatherForecast(37.7749, -122.4194, 7, 'fahrenheit')
//   .then(forecast => {
//     forecast.forEach(day => {
//       console.log(`${day.date}: ${day.minTemp}°-${day.maxTemp}°, ${day.precipitationProbability}% rain`);
//     });
//   });
```

### get_weather_wttr_simple

Get simple weather using wttr.in (human-readable, very fast).

```bash
# Get weather by city name (plain text)
curl -s "https://wttr.in/London?format=3"
# Output: London: ☀️ +22°C

# Get detailed weather report
curl -s "https://wttr.in/Paris"

# JSON format
curl -s "https://wttr.in/Tokyo?format=j1" | jq '.current_condition[0] | {
  temp_f: .temp_F,
  humidity: .humidity,
  description: .weatherDesc[0].value,
  wind_mph: .windspeedMiles
}'

# Custom format (temperature and conditi