California · NWS MTR office

Sunnyvale, CA weather

It is 50°F and partly cloudy at Mountain View, Moffett Field as of Oct 28, 1:55 AM PDT. Overnight: Patchy Fog, low near 46°F. Forecast from the National Weather Service, issued Oct 28, 1:26 AM PDT.

Updated Oct 28, 2:15 AM PDT (snapshot)

Current conditions

Temperature

50°F

Partly Cloudy

Wind

Calm

Humidity 76% · dew point 43°F

Pressure · visibility

30.01 inHg

Visibility 9 mi

Observed at Mountain View, Moffett Field (KNUQ), Oct 28, 1:55 AM PDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Sunnyvale forecast zone right now.

Around the NWS MTR forecast area

2 active alerts cover zones served by the MTR office near Sunnyvale:

  • Coastal Flood Advisory (2)

From the alert snapshot of Oct 28, 2026, 5:12 AM EDT. California has 8 active alerts: see them all.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Sunnyvale (local time)
TimeTempForecastPrecip. chanceWind
Wed 2 AM48°FPatchy Fog0%WSW 2 mph
Wed 3 AM47°FPatchy Fog0%SSW 2 mph
Wed 4 AM46°FPatchy Fog0%SW 2 mph
Wed 5 AM46°FPatchy Fog0%WSW 2 mph
Wed 6 AM46°FPatchy Fog0%WNW 2 mph
Wed 7 AM46°FPatchy Fog0%W 2 mph
Wed 8 AM46°FSunny0%WNW 2 mph
Wed 9 AM51°FSunny0%NW 2 mph
Wed 10 AM57°FMostly Sunny0%NNW 3 mph
Wed 11 AM60°FMostly Sunny0%NNW 5 mph
Wed 12 PM64°FSunny0%NNW 5 mph
Wed 1 PM66°FSunny0%NNW 6 mph
Wed 2 PM67°FMostly Sunny0%NNW 7 mph
Wed 3 PM68°FMostly Sunny0%NNW 8 mph
Wed 4 PM68°FMostly Sunny0%NNW 8 mph
Wed 5 PM67°FSunny0%NNW 8 mph
Wed 6 PM65°FMostly Clear0%NNW 6 mph
Wed 7 PM62°FPartly Cloudy0%NNW 3 mph
Wed 8 PM59°FPartly Cloudy0%NNW 2 mph
Wed 9 PM57°FPartly Cloudy0%NNW 2 mph
Wed 10 PM55°FMostly Cloudy0%SSW 1 mph
Wed 11 PM54°FMostly Cloudy0%S 1 mph
Thu 12 AM53°FMostly Cloudy0%S 2 mph
Thu 1 AM52°FMostly Cloudy0%S 2 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Sunnyvale can differ.

7-day forecast

Overnight

Low 46°F

Patchy fog. Partly cloudy, with a low around 46. Southwest wind around 2 mph.

Wednesday

High 68°F·Low 48°F

Patchy fog before 8am. Mostly sunny, with a high near 68. West northwest wind 2 to 8 mph.

Wednesday Night: Mostly cloudy, with a low around 48. South wind 1 to 6 mph.

Thursday

High 69°F·Low 47°F

Mostly cloudy, with a high near 69. Southwest wind 0 to 5 mph.

Thursday Night: Patchy fog after 5am. Mostly cloudy, with a low around 47. West southwest wind 1 to 5 mph.

Friday

High 67°F·Low 44°F

Patchy fog before 9am. Mostly sunny, with a high near 67.

Friday Night: Patchy fog after 3am. Partly cloudy, with a low around 44.

Saturday

High 64°F·Low 45°F

Patchy fog before 9am. Mostly cloudy, with a high near 64.

Saturday Night: Partly cloudy, with a low around 45.

Sunday

High 66°F·Low 46°F

Sunny, with a high near 66.

Sunday Night: Mostly clear, with a low around 46.

Monday

High 70°F·Low 49°F

Mostly sunny, with a high near 70.

Monday Night: Mostly cloudy, with a low around 49.

Tuesday

High 70°F

A chance of rain after 10am. Mostly sunny, with a high near 70.

Nearby cities

Larger cities in the area

Other cities in Santa Clara County

See every city we cover in California, or check all active alerts.

About this forecast

Forecast office
Sunnyvale is served by the National Weather Service MTR forecast office, forecast zone CAZ513, county zone CAC085.
Location used
The Census Bureau's internal point for Sunnyvale (37.3858, -122.0263), in Santa Clara County. Population: 156,792 (2024 estimate), number 37 of the 296 California cities on this site.
Radar
Nearest NWS radar: KMUX. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/37.3858,-122.0263 (forecast issued Oct 28, 1:26 AM PDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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