Check the weather on Apple Watch
Use the Weather app 
on your Apple Watch to track current and upcoming weather conditions, locally or in locations around the globe. You can easily check on current weather details such as clear or cloudy skies, temperature, precipitation, wind, ultraviolet (UV) conditions, visibility, humidity, and air quality.
Siri: You can use Siri to quickly provide weather information by saying something like, “What’s the weather like?” or “What’s tomorrow’s forecast for Honolulu?”
Check the local weather
With the Weather app on your Apple Watch, you can view the following weather metrics:
Current temperature
Conditions (mostly cloudy, for example)
Low and high temperatures for the day
Precipitation
Wind speed
UV index
Visibility
Humidity
Air quality
Note: Air quality readings not available for all locations.
If local weather doesn’t appear on your Apple Watch when you open the Weather app, be sure that Location Services is turned on. Open the Settings app 
on your Apple Watch, tap Privacy & Security, tap Location Services, then turn on Location Services. On iPhone, go to Settings > Privacy & Security > Location Services, tap Weather, then choose an option.
Show weather forecasts
Open the Weather app
from the Home screen on your Apple Watch.Scroll down one screen to show the forecast for the next 24 hours, including conditions and temperatures.
Scroll down one more screen to show a 10-day forecast.
View individual weather metrics
You can show details about individual weather metrics such as temperature, humidity, and air quality, then show forecast information for just that metric.
Choose a metric: Tap
button at the top right, then select a metric such as air quality. Turn the Digital Crown to show forecast information for just that metric.Cycle through metrics: Tap the display to cycle through available metrics.
See weather advisories
When a significant weather event is predicted, a notification may appear at the top of the Weather app. To learn more about the event, tap Learn More.
Note: Weather advisories not available for all locations.
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