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
94°
Fri, Oct 16
Coldest night
47°
Tue, Oct 20
Days with precip
0 / 14
of 14 forecast days
Nicest day
Sun, Oct 18
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 17 – Sun 18 Oct
91° 50°
5% precip chance
Sat 24 – Sun 25 Oct
88° 53°
6% precip chance
31 Oct – 1 Nov
84° 40°
typical range
Sat 7 – Sun 8 Nov
68° 41°
typical range
30 days — Castro Valley
14 forecast + 16 climatology
Wed · Today Sunny
82°51°1%⌄
Wind6 mph NW
Gusts15 mph
UV index5 – Moderate
Precip chance1%
Sunrise07:15
Sunset18:32
Thu · Tomorrow Sunny
88°55°0%⌄
Wind5 mph NE
Gusts14 mph
UV index5 – Moderate
Precip chance0%
Sunrise07:16
Sunset18:31
Friday 16/10 Sunny
94°60°0%⌄
Wind4 mph NE
Gusts16 mph
UV index6 – Moderate
Precip chance0%
Sunrise07:17
Sunset18:30
Saturday 17/10 Sunny
91°58°1%⌄
Wind8 mph W
Gusts19 mph
UV index5 – Moderate
Precip chance1%
Sunrise07:18
Sunset18:28
Sunday 18/10 Sunny
73°50°5%⌄
Wind7 mph SW
Gusts15 mph
UV index6 – High
Precip chance5%
Sunrise07:19
Sunset18:27
Monday 19/10 Mostly cloudy
64°47°14%⌄
Wind8 mph W
Gusts10 mph
UV index4 – Moderate
Precip chance14%
Sunrise07:20
Sunset18:25
Tuesday 20/10 Mostly cloudy
65°47°16%⌄
Wind5 mph W
Gusts15 mph
UV index4 – Moderate
Precip chance16%
Sunrise07:21
Sunset18:24
Wednesday 21/10 Mostly cloudy
69°50°10%⌄
Wind9 mph W
Gusts11 mph
UV index6 – High
Precip chance10%
Sunrise07:22
Sunset18:23
Thursday 22/10 Sunny
74°50°7%⌄
Wind8 mph W
Gusts15 mph
UV index6 – High
Precip chance7%
Sunrise07:23
Sunset18:22
Friday 23/10 Sunny
76°50°5%⌄
Wind6 mph W
Gusts17 mph
UV index6 – High
Precip chance5%
Sunrise07:24
Sunset18:20
Saturday 24/10 Partly cloudy
82°53°5%⌄
Wind4 mph NE
Gusts15 mph
UV index7 – High
Precip chance5%
Sunrise07:25
Sunset18:19
Sunday 25/10 Mostly cloudy
88°57°6%⌄
Wind5 mph W
Gusts13 mph
UV index8 – Very high
Precip chance6%
Sunrise07:26
Sunset18:18
Monday 26/10 Mostly cloudy
85°57°8%⌄
Wind4 mph W
Gusts15 mph
UV index6 – High
Precip chance8%
Sunrise07:27
Sunset18:17
Tuesday 27/10 Sunny
86°55°3%⌄
Wind3 mph W
Gusts14 mph
UV index7 – High
Precip chance3%
Sunrise07:28
Sunset18:15
Wednesday 28/10 Light rain (climatological)
80°53°1.6 mm⌄
Day≈74–85°
Night≈48–58°
Precip≈0.6 in / October
(climatological)Typical range for these dates · 1991–2020
Thursday 29/10 Partly cloudy (climatological)
85°56°20%⌄
Day≈80–91°
Night≈51–62°
Precip≈0.6 in / October
(climatological)Typical range for these dates · 1991–2020
Friday 30/10 Partly cloudy (climatological)
81°54°20%⌄
Day≈76–87°
Night≈49–59°
Precip≈0.6 in / October
(climatological)Typical range for these dates · 1991–2020
Saturday 31/10 Light rain (climatological)
84°55°1.5 mm⌄
Day≈79–89°
Night≈50–61°
Precip≈0.6 in / October
(climatological)Typical range for these dates · 1991–2020
Sunday 1/11 Partly cloudy (climatological)
64°40°20%⌄
Day≈59–70°
Night≈34–45°
Precip≈0.6 in / November
(climatological)Typical range for these dates · 1991–2020
Monday 2/11 Partly cloudy (climatological)
63°39°20%⌄
Day≈58–69°
Night≈34–44°
Precip≈0.6 in / November
(climatological)Typical range for these dates · 1991–2020
Tuesday 3/11 Light rain (climatological)
62°38°1.3 mm⌄
Day≈57–68°
Night≈33–44°
Precip≈0.6 in / November
(climatological)Typical range for these dates · 1991–2020
Wednesday 4/11 Partly cloudy (climatological)
66°40°20%⌄
Day≈60–71°
Night≈35–46°
Precip≈0.6 in / November
(climatological)Typical range for these dates · 1991–2020
Thursday 5/11 Partly cloudy (climatological)
72°44°20%⌄
Day≈67–78°
Night≈39–50°
Precip≈0.6 in / November
(climatological)Typical range for these dates · 1991–2020
Friday 6/11 Light rain (climatological)
72°44°2.0 mm⌄
Day≈66–77°
Night≈39–49°
Precip≈0.6 in / November
(climatological)Typical range for these dates · 1991–2020
Saturday 7/11 Partly cloudy (climatological)
67°41°20%⌄
Day≈62–73°
Night≈36–47°
Precip≈0.6 in / November
(climatological)Typical range for these dates · 1991–2020
Sunday 8/11 Partly cloudy (climatological)
68°42°20%⌄
Day≈62–73°
Night≈36–47°
Precip≈0.6 in / November
(climatological)Typical range for these dates · 1991–2020
Monday 9/11 Light rain (climatological)
62°38°1.6 mm⌄
Day≈57–68°
Night≈33–44°
Precip≈0.6 in / November
(climatological)Typical range for these dates · 1991–2020
Tuesday 10/11 Partly cloudy (climatological)
62°38°20%⌄
Day≈56–67°
Night≈33–43°
Precip≈0.6 in / November
(climatological)Typical range for these dates · 1991–2020
Wednesday 11/11 Partly cloudy (climatological)
70°43°20%⌄
Day≈64–75°
Night≈38–48°
Precip≈0.6 in / November
(climatological)Typical range for these dates · 1991–2020
Thursday 12/11 Light rain (climatological)
72°44°0.9 mm⌄
Day≈66–77°
Night≈39–49°
Precip≈0.6 in / November
(climatological)Typical range for these dates · 1991–2020
The month ahead · Castro Valley
Days 1-14 blend the NBM, ECMWF and GFS runs; the rest is the 30-year climate range for these dates.