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Cupertino, CA Weather Forecast

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Overcast

59°F

Updated	5:21 am
Feels Like	52°F
Humidity	82%
Wind	N 0 mph
Barometer	29.95 in
Dew Point	53°F

Overcast

15°C

Updated	5:21 am
Feels Like	11°C
Humidity	82%
Wind	N 0 km/h
Barometer	101.4 kPa
Dew Point	12°C

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Sun & Moon

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Cloud Cover	33%
uv UV Index	7
Sunrise	6:56 AM
Sunset	7:05 PM
Moonrise	5:11 PM
Moonset	2:43 AM

Civil Twilight
6:27 AM to 6:53 AM
7:05 PM to 7:31 PM
Cupertino CA Weather - Waxing Gibbous Moon

Waxing Gibbous Moon

Cupertino Weather Forecast

REST OF TONIGHT	TUESDAY	TUESDAY NIGHT	WEDNESDAY	WEDNESDAY NIGHT	THURSDAY	THURSDAY NIGHT	FRIDAY	FRIDAY NIGHT	SATURDAY	SUNDAY	SUNDAY NIGHT

Mostly Cloudy	Partly Cloudy	Mostly Clear	Partly Cloudy	Mostly Clear	Sunny	Partly Cloudy	Partly Cloudy	Mostly Clear	Mostly Clear	Mostly Clear	Clear
Lo: 55°FLo: 13°C	Hi: 80°FHi: 27°C	Lo: 55°FLo: 13°C	Hi: 86°FHi: 30°C	Lo: 61°FLo: 16°C	Hi: 86°FHi: 30°C	Hi: 80°FHi: 27°C Lo: 59°FLo: 15°C	Hi: 80°FHi: 27°C Lo: 59°FLo: 15°C	Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C	Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C	Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C	Lo: 55°FLo: 13°C

POP = Probability of Precipitation.

Weather Outlook Updated: 302 AM PDT Tue Sep 22 2026 Cupertino, CA Weather - WeatherWorld.com

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Issued: 450 AM PDT Tue Sep 22 2026

Key Messages

Updated at 1201 AM PDT Tue Sep 22 2026

Warming trend begins today through Thursday
Cooler conditions Friday into the weekend

Aviation

... (12Z TAFS) Issued at 427 AM PDT Tue Sep 22 2026

Solid marine layer push overnight leading to mostly MVFR to IFR conditions. Seeing some compression on the marine layer leading to some patchy fog and dz/ra being reported. Expect clearing/rolling back to the coast mid to late morning most areas. HAF and MRY will hold onto CIGS for most of the day. Tonig...