Sunnyvale · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Sunnyvale & 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
34°
Wed, Sep 9
Coldest night
10°
Sat, Sep 5
Days with precip
0 / 14
of 14 forecast days
Nicest day
Sun, Sep 13
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
26° 10°
2% precip chance
Sat 12 – Sun 13 Sep
28° 11°
11% precip chance
Sat 19 – Sun 20 Sep
28° 14°
typical range
Sat 26 – Sun 27 Sep
28° 13°
typical range
30 days — Sunnyvale
14 forecast + 16 climatology
Tue · Today Mostly cloudy
24°13°12%⌄
Wind8 mph W
Gusts16 mph
UV index7 – High
Precip chance12%
Sunrise06:38
Sunset19:37
Wed · Tomorrow Partly cloudy
25°12°8%⌄
Wind11 mph SW
Gusts18 mph
UV index8 – High
Precip chance8%
Sunrise06:39
Sunset19:36
Thursday 3/9 Sunny
25°12°7%⌄
Wind8 mph NW
Gusts19 mph
UV index7 – High
Precip chance7%
Sunrise06:40
Sunset19:34
Friday 4/9 Sunny
26°12°5%⌄
Wind10 mph NW
Gusts19 mph
UV index7 – High
Precip chance5%
Sunrise06:41
Sunset19:33
Saturday 5/9 Sunny
26°10°2%⌄
Wind8 mph NW
Gusts15 mph
UV index7 – High
Precip chance2%
Sunrise06:42
Sunset19:31
Sunday 6/9 Sunny
26°11°2%⌄
Wind9 mph N
Gusts20 mph
UV index7 – High
Precip chance2%
Sunrise06:42
Sunset19:30
Monday 7/9 Sunny
29°12°1%⌄
Wind8 mph N
Gusts19 mph
UV index7 – High
Precip chance1%
Sunrise06:43
Sunset19:28
Tuesday 8/9 Sunny
32°16°0%⌄
Wind7 mph NW
Gusts16 mph
UV index8 – Very high
Precip chance0%
Sunrise06:44
Sunset19:27
Wednesday 9/9 Mostly cloudy
34°19°6%⌄
Wind6 mph NW
Gusts15 mph
UV index8 – Very high
Precip chance6%
Sunrise06:45
Sunset19:25
Thursday 10/9 Sunny
33°18°1%⌄
Wind7 mph NW
Gusts17 mph
UV index8 – Very high
Precip chance1%
Sunrise06:46
Sunset19:24
Friday 11/9 Sunny
32°15°2%⌄
Wind5 mph W
Gusts14 mph
UV index8 – Very high
Precip chance2%
Sunrise06:46
Sunset19:22
Saturday 12/9 Mostly cloudy
28°12°8%⌄
Wind5 mph S
Gusts16 mph
UV index6 – High
Precip chance8%
Sunrise06:47
Sunset19:21
Sunday 13/9 Mostly cloudy
25°11°11%⌄
Wind6 mph N
Gusts13 mph
UV index6 – High
Precip chance11%
Sunrise06:48
Sunset19:19
Monday 14/9 Sunny
34°17°1%⌄
Wind7 mph N
Gusts17 mph
UV index8 – Very high
Precip chance1%
Sunrise06:49
Sunset19:18
Tuesday 15/9 Light rain (climatological)
28°15°0.6 mm⌄
Day≈25–31°
Night≈12–18°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
31°16°20%⌄
Day≈28–34°
Night≈13–19°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
30°16°20%⌄
Day≈27–33°
Night≈13–19°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Light rain (climatological)
29°15°0.7 mm⌄
Day≈26–32°
Night≈12–18°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
27°14°20%⌄
Day≈24–30°
Night≈11–17°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
28°14°20%⌄
Day≈25–31°
Night≈11–17°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
26°13°0.4 mm⌄
Day≈23–29°
Night≈10–16°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
30°16°20%⌄
Day≈27–33°
Night≈13–19°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
29°15°20%⌄
Day≈26–32°
Night≈12–18°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
29°15°0.4 mm⌄
Day≈26–32°
Night≈12–18°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
28°15°20%⌄
Day≈25–31°
Night≈12–18°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
28°15°20%⌄
Day≈25–31°
Night≈12–18°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Light rain (climatological)
25°13°0.6 mm⌄
Day≈22–28°
Night≈10–16°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
28°14°20%⌄
Day≈25–31°
Night≈11–17°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Partly cloudy (climatological)
27°14°20%⌄
Day≈24–30°
Night≈11–17°
Precip≈0.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Partly cloudy (climatological)
29°15°0.5 mm⌄
Day≈26–32°
Night≈12–18°
Precip≈0.2 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 Sunnyvale, 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.