weather（天气）

Weather Skill

Provides current weather and forecasts for any location using Open-Meteo free APIs called directly via WebFetch:

• Open-Meteo Geocoding for resolving location names to coordinates
• Open-Meteo Forecast for weather data

Workflow

1. Understand the user's request. Extract the location, time range, and whether they're planning travel. See examples below.
2. Geocode the location using WebFetch to call the Nominatim API (see below). If the result is ambiguous, ask the user to clarify.
3. Fetch weather using WebFetch to call the Open-Meteo API with the lat/lon and appropriate parameters (see below).
4. Respond to the user with a clear summary. See example outputs below.
5. If travel intent is detected, also read references/clothing_guide.md and include relevant clothing advice.

API Calls

Step 1: Geocode with Open-Meteo Geocoding

Use WebFetch to GET:

https://geocoding-api.open-meteo.com/v1/search?name={location}&count=3&language=en&format=json

Replace {location} with the URL-encoded location string (e.g., Tokyo, Riyadh).

Response is a JSON object with a results array. Each item has:

• name — location name
• latitude, longitude — coordinates (floats)
• country — country name
• admin1 — state/region (optional)
• population — population count (optional, useful for disambiguation)

Ambiguity logic: If there are ≥ 2 results in different countries or regions and neither clearly dominates by population, treat the result as ambiguous. Present each candidate's name, admin1, and country and ask the user which they meant.

If the results key is missing or the array is empty, the location was not found — ask the user to be more specific.

Step 2: Fetch Weather from Open-Meteo

Use WebFetch to GET the Open-Meteo forecast URL, building it from the resolved coordinates and the desired resolution.

Base URL:

https://api.open-meteo.com/v1/forecast?latitude={lat}&longitude={lon}&timezone=auto&forecast_days=16

Always include the current parameter:

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

Add parameters based on resolution:

Optional params:

• &past_days=N — include N historical days (0–92). Use only when the user asks about past weather.
• &timezone=Asia/Tokyo — override auto timezone (rarely needed).

Response structure:

• current object: time, temperature_2m, apparent_temperature, weather_code, wind_speed_10m, relative_humidity_2m, precipitation
• hourly object: time[], temperature_2m[], apparent_temperature[], precipitation_probability[], precipitation[], weather_code[], wind_speed_10m[]
• daily object: time[], temperature_2m_max[], temperature_2m_min[], apparent_temperature_max[], apparent_temperature_min[], precipitation_sum[], precipitation_probability_max[], weather_code[], wind_speed_10m_max[]

WMO Weather Code Table

Use this table to convert the numeric weather_code in API responses to human-readable descriptions:

How to Interpret User Requests

The agent should interpret the user's natural language to determine three things:

1. Location

Extract the place name from the query. Examples:

• "Weather in Jeddah now" → "Jeddah"
• "Forecast for London this weekend" → "London"
• "I'm going to Tokyo next week" → "Tokyo"
• "How windy will it be in AlUla on Friday?" → "AlUla"

If no location is mentioned, ask the user.

2. Time Range, Resolution, and Past Weather

The user may specify dates in various formats (MM/DD, DD/MM, "May 1st", "1 March", etc.) — interpret based on context and filter the returned timeline accordingly. Use the current year unless another year is stated or implied.

Use daily for ranges > 3 days, hourly for shorter windows, current for right-now queries (but still include hourly for context).

Default (no time specified): current conditions + next 24 hours hourly.

Remember: Forecast is fixed to 16 days. For past requests, use past_days (0..92).

3. Travel Intent

Detect if the user is planning to go somewhere. Look for keywords like: pack, wear, travel, visiting, going to, headed to, trip, vacation, holiday, outing, flight, should I bring

If travel intent is detected → also include clothing guidance (see below).

Example Outputs

Example 1: Simple current weather

User: "What's the weather in Jeddah now?"

Response:

Weather in Jeddah, Saudi Arabia Right now it's Clear sky with a temperature of 28°C (feels like 30°C). Wind is light at 12 km/h from the north, and humidity is at 45%. No precipitation expected. Next few hours: - 3 PM: 29°C, Clear sky, 0% rain - 4 PM: 28°C, Partly cloudy, 0% rain - 5 PM: 26°C, Clear sky, 0% rain *(and so on...)*

Example 2: Weekend forecast

User: "Forecast for London this weekend"

Response:

Weekend Forecast for London, UK Saturday, Mar 1: Highs of 11°C, lows of 5°C. Moderate rain expected (70% probability, ~4mm). Wind up to 25 km/h. Sunday, Mar 2: Highs of 13°C, lows of 6°C. Partly cloudy, 20% rain chance. Lighter wind at 15 km/h. Overall: A wet Saturday clearing into a drier Sunday. Bring an umbrella for Saturday.

Example 3: Travel planning with clothing advice

User: "I'm going to Tokyo next week — what should I pack?"

Response:

Tokyo, Japan — Next Week Forecast (Mar 3–9) | Day | High | Low | Conditions | Rain | Wind | | --- | --- | --- | --- | --- | --- | | Mon | 12°C | 4°C | Partly cloudy | 10% | 15 km/h | | Tue | 10°C | 3°C | Slight rain | 65% | 20 km/h | | ... | ... | ... | ... | ... | ... | What to Wear: Expect cold conditions (lows near 3°C) with rain mid-week. Pack: - Warm layers: fleece or wool sweater + insulated jacket - Waterproof jacket and umbrella for Tuesday/Wednesday - Closed-toe waterproof shoes - Scarf and light gloves for mornings/evenings *See: clothing_guide.md — sections: cold, rainy*

Example 4: Specific condition query

User: "How windy will it be in AlUla on Friday?"

Response:

Wind Forecast for AlUla, Saudi Arabia — Friday, Feb 28 Wind speeds will peak at 35 km/h in the early afternoon, settling to around 15 km/h by evening. Morning winds are lighter at ~10 km/h. ⚠️ Moderately windy conditions expected midday — secure loose items and consider a windbreaker if you'll be outdoors.

Warnings

Include warnings when conditions are notable:

• Extreme heat: temp ≥ 40°C
• Extreme cold: temp ≤ -10°C
• Strong wind: ≥ 50 km/h
• Heavy rain: ≥ 20mm precipitation

Clothing Guidance

When travel intent is detected, read references/clothing_guide.md and include relevant advice in the response.

Error Handling

• Location not found: The Nominatim response is an empty array. Ask the user to be more specific (add city, country).
• Ambiguous location: Present the alternatives and ask which one.
• WebFetch failure: If WebFetch returns an error or non-JSON response, inform the user that the weather service is temporarily unavailable and suggest retrying.
• Beyond forecast horizon: Inform the user of the 16-day limit, return what's available.
• No time specified: Default to current + next 24 hours.