San Mateo · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
San Mateo & 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
78°
Wed, Sep 9
Coldest night
53°
Sat, Sep 5
Days with precip
0 / 14
of 14 forecast days
Nicest day
Mon, Sep 7
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
70° 53°
7% precip chance
Sat 12 – Sun 13 Sep
65° 53°
18% precip chance
Sat 19 – Sun 20 Sep
74° 53°
typical range
Sat 26 – Sun 27 Sep
72° 56°
typical range
30 days — San Mateo
14 forecast + 16 climatology
Wed · Today Sunny
70°55°17%⌄
Wind11 mph W
Gusts15 mph
UV index7 – High
Precip chance17%
Sunrise06:40
Sunset19:37
Thu · Tomorrow Sunny
69°55°0.4 mm⌄
Wind12 mph SW
Gusts18 mph
UV index4 – Moderate
Precip chance36%
Sunrise06:41
Sunset19:35
Friday 4/9 Sunny
69°55°9%⌄
Wind12 mph W
Gusts20 mph
UV index8 – High
Precip chance9%
Sunrise06:42
Sunset19:34
Saturday 5/9 Sunny
70°53°7%⌄
Wind12 mph W
Gusts17 mph
UV index8 – High
Precip chance7%
Sunrise06:43
Sunset19:32
Sunday 6/9 Sunny
69°53°7%⌄
Wind11 mph W
Gusts15 mph
UV index6 – High
Precip chance7%
Sunrise06:43
Sunset19:31
Monday 7/9 Sunny
70°54°5%⌄
Wind9 mph NW
Gusts20 mph
UV index6 – High
Precip chance5%
Sunrise06:44
Sunset19:29
Tuesday 8/9 Mostly cloudy
78°59°7%⌄
Wind11 mph W
Gusts14 mph
UV index6 – High
Precip chance7%
Sunrise06:45
Sunset19:28
Wednesday 9/9 Sunny
78°61°3%⌄
Wind10 mph NW
Gusts17 mph
UV index7 – High
Precip chance3%
Sunrise06:46
Sunset19:26
Thursday 10/9 Sunny
78°60°5%⌄
Wind7 mph NW
Gusts14 mph
UV index7 – High
Precip chance5%
Sunrise06:47
Sunset19:25
Friday 11/9 Sunny
70°54°8%⌄
Wind10 mph W
Gusts16 mph
UV index6 – High
Precip chance8%
Sunrise06:48
Sunset19:23
Saturday 12/9 Partly cloudy
62°53°18%⌄
Wind11 mph W
Gusts14 mph
UV index5 – Moderate
Precip chance18%
Sunrise06:48
Sunset19:22
Sunday 13/9 Sunny
65°55°11%⌄
Wind13 mph W
Gusts16 mph
UV index5 – Moderate
Precip chance11%
Sunrise06:49
Sunset19:20
Monday 14/9 Sunny
69°55°10%⌄
Wind8 mph W
Gusts9 mph
UV index6 – High
Precip chance10%
Sunrise06:50
Sunset19:19
Tuesday 15/9 Sunny
71°53°7%⌄
Wind7 mph NW
Gusts16 mph
UV index6 – High
Precip chance7%
Sunrise06:51
Sunset19:17
Wednesday 16/9 Light rain (climatological)
73°56°1.6 mm⌄
Day≈67–78°
Night≈51–62°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
72°56°20%⌄
Day≈67–78°
Night≈51–62°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
76°59°20%⌄
Day≈71–82°
Night≈53–64°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Light rain (climatological)
74°58°1.0 mm⌄
Day≈69–80°
Night≈52–63°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
66°53°20%⌄
Day≈61–72°
Night≈47–58°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
66°52°20%⌄
Day≈60–71°
Night≈47–58°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Light rain (climatological)
65°52°1.8 mm⌄
Day≈60–71°
Night≈47–58°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
73°57°20%⌄
Day≈68–79°
Night≈51–62°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
77°59°20%⌄
Day≈71–82°
Night≈53–64°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Light rain (climatological)
77°59°2.0 mm⌄
Day≈72–83°
Night≈54–65°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
72°56°20%⌄
Day≈66–77°
Night≈51–61°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
71°56°20%⌄
Day≈66–77°
Night≈50–61°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Light rain (climatological)
66°52°2.0 mm⌄
Day≈61–71°
Night≈47–58°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Partly cloudy (climatological)
70°55°20%⌄
Day≈64–75°
Night≈49–60°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Partly cloudy (climatological)
71°56°20%⌄
Day≈66–77°
Night≈50–61°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 1/10 Light rain (climatological)
61°46°2.0 mm⌄
Day≈56–67°
Night≈41–52°
Precip≈0.6 in / October
(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 San Mateo, 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.