Current forecastStart with the hourly forecastCheck when rain, wind, and temperature changes overlap your plans.
Open→Weather guidance for your areaPlan with the complete forecast
Safety guides Use current official weather information for Alpine, California 91901 before making weather-sensitive plans.
Live weatherCheck live radar before leavingUse radar with the forecast to see how precipitation is moving.
Open→Safety guideReview official safety guidancePrepare for storms, flooding, heat, cold, and other hazards.
Open→Healthy weatherInclude air quality in outdoor plansUse official EPA information when planning time outside.
Open→Weather status
Extreme Heat Watch
Extreme Heat Watch issued August 23 at 1:54PM PDT until August 28 at 8:00PM PDT by NWS San Diego CA Expires Fri, 8:00 PM PDT.
Official NOAA / NWSWSR-88D DopplerUpdates every 5 minutes
Live Doppler radar
Animated Multi-Radar/Multi-Sensor reflectivity from the National Weather Service’s network of Doppler radars. Search a U.S. city, ZIP code, or street address to center the map on local weather, then zoom to neighborhood street detail.
Live radar is ready when you need it.
The interactive map stays off until opened to keep forecasts fast.
After loading, MyUSA.us shows the exact Doppler frame time, refresh controls, and an official NWS fallback if the map is unavailable.Doppler radar and warnings: NOAA/National Weather Service · Map: OpenFreeMap, OpenMapTiles and OpenStreetMap contributors. Radar can be delayed briefly during service updates.
MyUSA.us is not affiliated with or endorsed by NOAA or the National Weather Service. For life-threatening weather, follow official NWS alerts and local authorities.
What’s next
Hourly forecast
Check the latest hourly conditions, seven-day outlook, rain timing, wind, sunrise and sunset for Alpine, California 91901. Forecasts and alerts update from NOAA and the National Weather Service.
95°Sunny1% rain93°Sunny1% rain
91°Mostly Clear1% rain87°Mostly Clear1% rain83°Mostly Clear1% rain81°Mostly Clear1% rain79°Mostly Clear1% rain
78°Partly Cloudy1% rainNext 24 hours
Rain Timeline
No meaningful precipitation is expected in the official hourly forecast.
1%None
1%None
1%None
1%None
1%None
1%None
1%None
1%None
1%None
1%None
1%None
1%None
1%None
6%None
6%None
6%None
6%None
6%None
6%None
6%None
6%None
6%None
6%None
6%None
Official NWS outlook
7-Day Forecast
Today
! NWS97°71°
Sunny
- Precipitation
- 6%
- Wind
- W 10 mph
- Sunrise
- 6:17 AM
- Sunset
- 7:25 PM
Mon
94°70°
Sunny
- Precipitation
- 6%
- Wind
- W 0 to 10 mph
- Sunrise
- 6:17 AM
- Sunset
- 7:23 PM
Tue
95°73°
Sunny
- Precipitation
- 10%
- Wind
- N 0 to 10 mph
- Sunrise
- 6:18 AM
- Sunset
- 7:22 PM
Wed
96°75°
Sunny
- Precipitation
- 4%
- Wind
- S 0 to 10 mph
- Sunrise
- 6:19 AM
- Sunset
- 7:21 PM
Thu
98°74°
Sunny
- Precipitation
- 9%
- Wind
- NW 0 to 10 mph
- Sunrise
- 6:19 AM
- Sunset
- 7:20 PM
Fri
98°73°
Sunny
- Precipitation
- 2%
- Wind
- N 0 to 10 mph
- Sunrise
- 6:20 AM
- Sunset
- 7:19 PM
Sat
97°72°
Sunny
- Precipitation
- 4%
- Wind
- NW 0 to 10 mph
- Sunrise
- 6:21 AM
- Sunset
- 7:17 PM
Forecasts, icons, precipitation, wind, and alerts are from the National Weather Service. Sunrise and sunset are calculated locally for the selected coordinates.
Weather for a healthier day
Healthy Weather
Real Feel98°F
Walking is not recommended now
Review the active Extreme Heat Watch before going outside. MyUSA.us will not recommend this activity while an NWS watch, warning, or emergency is active.
WindW10 mph
Best walk timeReview the active Extreme Heat Watch before leaving
MyUSA.us will not recommend an outing window while an NWS watch, warning, or emergency is active. Follow the official alert and local instructions.
Official EPA AirNowLocal air qualityAlpine, California 91901View AQI +
More weather details
Wind gustsNot reported
Rain now1%next hour
Humidity26%current
UV indexCheckingEPA forecast
Wind impact: Noticeable breeze with generally minor outdoor impact.
“Better weather window” is planning guidance based on official NWS data—not a promise of safe conditions. Review active alerts and radar before leaving.
Storm & DetailsGusts, pressure, visibility and official risk outlooksView details +
Wind gustNot reported
Pressure—
Visibility—
Peak rain chance6%
Dew point57°F
Active alerts2
Official risk outlooks
These national tools add expert storm, heavy-rain and flooding context to your local forecast.
Loading nearby traffic cameras…
Official tropical weather
Hurricane center
NOAA National Hurricane Center updates, outlooks, and storm resources in one place.
NOAA / NHC Atlantic
Hurricane center
Official Atlantic, Caribbean, and Gulf updatesSimple, useful help
Weather safety guides
Quick answers for heat, storms, flooding and hurricane preparation—kept separate so your main weather page stays clean.
Stay weather-ready
Active NWS alerts
Severe · Future
Extreme Heat Watch
Applies to: San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; Riverside County Mountains; Santa Ana Mountains and Foothills; San Diego County Mountains; Orange County InlandIssued by: NWS San Diego CAExtreme Heat Watch issued August 23 at 1:54PM PDT until August 28 at 8:00PM PDT by NWS San Diego CAAlert details
* WHAT...Temperatures 90 to 98 for Inland Orange County, 90 to 102 for the San Diego County Valleys, 100 to 106 for the Inland Empire and 89 to 100 in the mountains. Temperatures increase slightly for the middle and end of next week, making for a prolonged and dangerous stretch of heat. * WHERE...Orange County Inland Areas, Riverside County Mountains, San Bernardino and Riverside County Valleys-The Inland Empire, San Diego County Mountains, San Diego County Valleys, and Santa Ana Mountains and Foothills. * WHEN...For the Heat Advisory, until 10 AM PDT Tuesday. For the Extreme Heat Watch, from Tuesday morning through Friday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Low temperatures 5 to 10 degrees above normal will limit relief from the heat. Increasing temperatures into the middle of next week will increase the threat of heat-related illness across populations.Safety instructions
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.Moderate · Expected