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Hourly Forecast
Daylight Hours
06:57
Sunrise
19:08
Sunset
Moon
Waxing Crescent
12:46
Moonrise
21:28
Moonset
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Weather in Foster City today, September 16, 2026
Foster City starts September 16, 2026 under largely sunny skies, with bright spells setting the tone from the outset. Outdoor plans should enjoy long stretches of open sky as the day unfolds. The morning looks comparatively open, with cloud near 48% around 07:00. Early outdoor plans have a better chance of staying dry and bright.
Expect highs of 23°C and cooler readings close to 12°C. Expect humidity between 63% and 95%, most humid near 06:00. Winds stay light, near 5.9 km/h by 11:00, so the day feels still more than breezy.
Afternoon conditions open up, holding cloud close to 38% near 13:00. The day finishes on a milder, brighter note. Visibility stays generally good near 15.7 km on average, though it can drop toward 14.0 km in thicker cloud or showers. Daylight runs from 06:57 to 19:08, lasting 12 hours 11 minutes of sunlight today.
In short, September 16, 2026 looks like a fine day in Foster City for being outside, peaking around 23°C.
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