Foster City · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Foster City & neighbors — hit play
Every city on the map carries real forecast data from the same models as its city page, refreshed several times a day. The icon is the day's overall look; the number is the afternoon high.
Next 14 days at a glance
from the model forecast
Hottest day
24°
Tue, Aug 25
Coldest night
12°
Sun, Aug 16
Days with precip
0 / 14
of 14 forecast days
Nicest day
Wed, Aug 26
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 15 – Sun 16 Aug
22° 12°
14% precip chance
Sat 22 – Sun 23 Aug
24° 13°
12% precip chance
Sat 29 – Sun 30 Aug
25° 14°
typical range
Sat 5 – Sun 6 Sep
22° 11°
typical range
30 days — Foster City
14 forecast + 16 climatology
Fri · Today Partly cloudy
20°14°22%⌄
Wind12 mph W
Gusts14 mph
UV index9 – Very high
Precip chance22%
Sunrise06:24
Sunset20:03
Sat · Tomorrow Partly cloudy
20°13°14%⌄
Wind10 mph W
Gusts12 mph
UV index9 – Very high
Precip chance14%
Sunrise06:25
Sunset20:02
Sunday 16/8 Sunny
22°12°9%⌄
Wind9 mph W
Gusts12 mph
UV index9 – Very high
Precip chance9%
Sunrise06:25
Sunset20:00
Monday 17/8 Sunny
22°12°17%⌄
Wind11 mph W
Gusts12 mph
UV index9 – Very high
Precip chance17%
Sunrise06:26
Sunset19:59
Tuesday 18/8 Sunny
22°13°11%⌄
Wind9 mph W
Gusts11 mph
UV index6 – High
Precip chance11%
Sunrise06:27
Sunset19:58
Wednesday 19/8 Sunny
22°12°12%⌄
Wind10 mph W
Gusts12 mph
UV index6 – High
Precip chance12%
Sunrise06:28
Sunset19:56
Thursday 20/8 Partly cloudy
20°14°18%⌄
Wind10 mph W
Gusts11 mph
UV index6 – High
Precip chance18%
Sunrise06:29
Sunset19:55
Friday 21/8 Sunny
20°14°14%⌄
Wind10 mph W
Gusts11 mph
UV index6 – High
Precip chance14%
Sunrise06:30
Sunset19:54
Saturday 22/8 Sunny
24°13°12%⌄
Wind8 mph W
Gusts13 mph
UV index6 – High
Precip chance12%
Sunrise06:31
Sunset19:52
Sunday 23/8 Sunny
23°13°12%⌄
Wind9 mph NW
Gusts13 mph
UV index6 – High
Precip chance12%
Sunrise06:31
Sunset19:51
Monday 24/8 Sunny
22°13°12%⌄
Wind9 mph NW
Gusts12 mph
UV index6 – High
Precip chance12%
Sunrise06:32
Sunset19:50
Tuesday 25/8 Sunny
24°13°7%⌄
Wind9 mph W
Gusts12 mph
UV index6 – High
Precip chance7%
Sunrise06:33
Sunset19:48
Wednesday 26/8 Sunny
22°13°7%⌄
Wind9 mph W
Gusts12 mph
UV index6 – High
Precip chance7%
Sunrise06:34
Sunset19:47
Thursday 27/8 Sunny
23°13°6%⌄
Wind10 mph W
Gusts15 mph
UV index6 – High
Precip chance6%
Sunrise06:35
Sunset19:45
Friday 28/8 Light rain (climatological)
21°13°0.8 mm⌄
Day≈18–24°
Night≈10–16°
Precip≈0.6 in / August
(climatological)Typical range for these dates · 1991–2020
Saturday 29/8 Partly cloudy (climatological)
24°14°20%⌄
Day≈21–27°
Night≈11–17°
Precip≈0.6 in / August
(climatological)Typical range for these dates · 1991–2020
Sunday 30/8 Partly cloudy (climatological)
25°15°20%⌄
Day≈22–28°
Night≈12–18°
Precip≈0.6 in / August
(climatological)Typical range for these dates · 1991–2020
Monday 31/8 Light rain (climatological)
23°14°1.4 mm⌄
Day≈20–26°
Night≈11–17°
Precip≈0.6 in / August
(climatological)Typical range for these dates · 1991–2020
Tuesday 1/9 Partly cloudy (climatological)
18°10°20%⌄
Day≈15–21°
Night≈7–13°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 2/9 Partly cloudy (climatological)
16°8°20%⌄
Day≈13–19°
Night≈5–11°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 3/9 Light rain (climatological)
17°9°1.7 mm⌄
Day≈14–20°
Night≈6–12°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 4/9 Partly cloudy (climatological)
18°10°20%⌄
Day≈15–21°
Night≈7–13°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 5/9 Partly cloudy (climatological)
22°12°20%⌄
Day≈19–25°
Night≈9–15°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 6/9 Light rain (climatological)
21°11°1.8 mm⌄
Day≈18–24°
Night≈8–14°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Partly cloudy (climatological)
20°11°20%⌄
Day≈17–23°
Night≈8–14°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
17°9°20%⌄
Day≈14–20°
Night≈6–12°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Light rain (climatological)
17°9°0.9 mm⌄
Day≈14–20°
Night≈6–12°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
17°9°20%⌄
Day≈14–20°
Night≈6–12°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
17°9°20%⌄
Day≈14–20°
Night≈6–12°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Light rain (climatological)
20°11°1.6 mm⌄
Day≈17–23°
Night≈8–14°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
How does a 30-day outlook work?
The first 14 days are a live model forecast. The back half of the month shows the typical range for those dates — useful for planning, not a literal prediction.
First 14 days: a real forecast, blended from NBM, ECMWF and GFS runs. Trust it most inside three days; by the second week treat it as a lean, not a promise.
Rest of the month: past day 14 we stop pretending to forecast and switch to the climate corridor — the range those dates have produced over three decades computed directly for Foster City, with mild week-to-week wiggle.
Good question for this page: "Is late August usually humid in Chicago?" Bad question: "Do I need an umbrella on the 29th?" — three weeks out no one knows, and that's the honest answer.