Castro Valley, CA Hourly Weather Forecast
Next 48 Hours
Mon, Nov 2nd 2026
Expect consistent Overcast skies throughout the day. Warming trend from 46°F to 68°. Calm winds, shifting from SSE to SSW at 2.2 mph, with humidity ranging 33% to 94%, and an avg barometric pressure of 30.12 inHg.
| Mon, Nov 2nd | Temp | Humidity | Wind (mph) | Pressure (inHg) | Dew Point | Precip. |
|---|---|---|---|---|---|---|
1 AM Partly Cloudy UV: 0 |
48°F Feels 46°F |
91% | 2.2 SSE | 30.12 | 45.8°F | 21% |
2 AM Overcast UV: 0 |
49°F Feels 47°F |
90% | 1.8 SSW | 30.11 | 46.1°F | 29% |
3 AM OvercastUV: 0 |
48°F Feels 46°F |
90% | 2.5 SE | 30.1 | 45.7°F | 30% |
4 AM OvercastUV: 0 |
47°F Feels 44°F |
94% | 2 ESE | 30.11 | 44.8°F | 32% |
5 AM OvercastUV: 0 |
50°F Feels 47°F |
84% | 2.5 ESE | 30.11 | 45.2°F | 26% |
6 AM OvercastUV: 0 |
49°F Feels 47°F |
85% | 0.9 E | 30.13 | 44.5°F | 27% |
7 AM Overcast UV: 0 |
46°F Feels 43°F |
91% | 2 ENE | 30.16 | 43.3°F | 28% |
8 AM OvercastUV: 0.2 |
55°F Feels 53°F |
72% | 2.5 ENE | 30.14 | 46°F | 19% |
9 AM OvercastUV: 0.9 |
59°F Feels 57°F |
60% | 2.7 E | 30.15 | 45.6°F | 15% |
10 AM OvercastUV: 1.7 |
62°F Feels 60°F |
60% | 1.8 ESE | 30.17 | 47.5°F | 14% |
11 AM OvercastUV: 2.8 |
66°F Feels 64°F |
42% | 1.3 E | 30.15 | 42.5°F | 10% |
12 PM OvercastUV: 3.1 |
68°F Feels 65°F |
36% | 2 ESE | 30.13 | 40.9°F | 10% |
1 PM OvercastUV: 2.2 |
67°F Feels 65°F |
44% | 0.9 S | 30.13 | 44.1°F | 10% |
2 PM OvercastUV: 1.5 |
68°F Feels 64°F |
33% | 2.5 SE | 30.1 | 38°F | 10% |
3 PM OvercastUV: 0.9 |
68°F Feels 64°F |
33% | 2.2 S | 30.1 | 37.8°F | 10% |
4 PM OvercastUV: 0.4 |
64°F Feels 62°F |
51% | 2.5 W | 30.1 | 45.8°F | 11% |
5 PM OvercastUV: 0 |
59°F Feels 56°F |
44% | 1.1 SW | 30.08 | 37.3°F | 11% |
6 PM OvercastUV: 0 |
58°F Feels 53°F |
50% | 3.8 W | 30.11 | 38.9°F | 12% |
7 PM OvercastUV: 0 |
55°F Feels 54°F |
76% | 2 WNW | 30.13 | 47.9°F | 22% |
8 PM OvercastUV: 0 |
55°F Feels 52°F |
66% | 3.8 ESE | 30.1 | 43.5°F | 17% |
9 PM OvercastUV: 0 |
56°F Feels 52°F |
61% | 4.9 ESE | 30.08 | 42.3°F | 15% |
10 PM Partly CloudyUV: 0 |
53°F Feels 51°F |
79% | 0.9 SSE | 30.09 | 46.1°F | 15% |
11 PM Clear UV: 0 |
53°F Feels 49°F |
64% | 2.5 SSW | 30.08 | 40.7°F | 5% |
Tue, Nov 3rd 2026
Starting off scattered showers, turning Clear conditions later in the day. Warming trend from 48°F to 63°. Light winds, shifting from SSW to NE at 4.4 mph, as humidity ranges 69% to 92%, and an avg barometric pressure of 30.07 inHg.
| Tue, Nov 3rd | Temp | Humidity | Wind (mph) | Pressure (inHg) | Dew Point | Precip. |
|---|---|---|---|---|---|---|
12 AM ClearUV: 0 |
51°F Feels 48°F |
71% | 2.5 SSW | 30.08 | 42.5°F | 6% |
1 AM Partly CloudyUV: 0 |
50°F Feels 48°F |
90% | 1.6 WSW | 30.09 | 46.7°F | 17% |
2 AM ClearUV: 0 |
50°F Feels 48°F |
83% | 2 WSW | 30.1 | 45°F | 11% |
3 AM ClearUV: 0 |
50°F Feels 47°F |
86% | 2 SSE | 30.08 | 45.3°F | 12% |
4 AM Partly CloudyUV: 0 |
51°F Feels 50°F |
90% | 3.6 SE | 30.07 | 47.9°F | 18% |
5 AM ClearUV: 0 |
48°F Feels 46°F |
81% | 4.5 SE | 30.07 | 42.7°F | 10% |
6 AM Partly CloudyUV: 0 |
48°F Feels 46°F |
80% | 5.1 SE | 30.07 | 42.1°F | 12% |
7 AM Cloudy UV: 0 |
49°F Feels 47°F |
89% | 4.7 SE | 30.07 | 45.8°F | 26% |
8 AM Light Drizzle UV: 0.1 |
54°F Feels 51°F |
76% | 4.3 S | 30.08 | 46.3°F | 47% Rain est. 0.01in |
9 AM Light DrizzleUV: 0.2 |
53°F Feels 51°F |
83% | 4.9 SE | 30.08 | 48°F | 47% Rain est. 0.01in |
10 AM Scattered Showers UV: 0.9 |
57°F Feels 54°F |
81% | 6.7 SSE | 30.07 | 51.4°F | 27% |
11 AM Scattered ShowersUV: 1.7 |
60°F Feels 56°F |
70% | 7.6 SSW | 30.08 | 50.2°F | 21% |
12 PM Scattered ShowersUV: 2.1 |
60°F Feels 56°F |
72% | 7.2 S | 30.07 | 50.9°F | 22% |
1 PM Patchy Light Drizzle UV: 3.1 |
63°F Feels 58°F |
69% | 9.2 S | 30.04 | 52.4°F | 42% Rain est. 0.02in |
2 PM Scattered ShowersUV: 1.9 |
61°F Feels 58°F |
72% | 6 S | 30.06 | 51.5°F | 32% Rain est. 0.01in |
3 PM Light Rain Shower UV: 1.2 |
62°F Feels 60°F |
69% | 4.3 S | 30.06 | 51.8°F | 44% Rain est. 0.02in |
4 PM Light Rain ShowerUV: 0.4 |
62°F Feels 61°F |
71% | 3.1 SSW | 30.03 | 52.2°F | 36% Rain est. 0.01in |
5 PM Scattered ShowersUV: 0 |
58°F Feels 57°F |
80% | 3.1 ENE | 30.06 | 51.8°F | 35% Rain est. 0.01in |
6 PM Scattered Showers UV: 0 |
57°F Feels 55°F |
77% | 4.7 ENE | 30.08 | 50°F | 24% |
7 PM Light Drizzle UV: 0 |
57°F Feels 57°F |
87% | 2.7 E | 30.06 | 53.4°F | 49% Rain est. 0.01in |
8 PM Partly CloudyUV: 0 |
56°F Feels 54°F |
75% | 3.4 NE | 30.09 | 48.2°F | 11% |
9 PM ClearUV: 0 |
52°F Feels 50°F |
82% | 4 NE | 30.1 | 46.1°F | 11% |
10 PM Partly CloudyUV: 0 |
55°F Feels 54°F |
92% | 3.4 NE | 30.08 | 52.7°F | 19% |
11 PM ClearUV: 0 |
48°F Feels 46°F |
92% | 4.7 NE | 30.1 | 45.9°F | 14% |
Wed, Nov 4th 2026
Misty conditions expected later. Temps around 47°. Light winds from the NE at 4.7 mph, while humidity around 94%, and an avg barometric pressure of 30.1 inHg.
| Wed, Nov 4th | Temp | Humidity | Wind (mph) | Pressure (inHg) | Dew Point | Precip. |
|---|---|---|---|---|---|---|
12 AM Mist UV: 0 |
47°F Feels 45°F |
94% | 4.7 NE | 30.1 | 45.5°F | 20% |
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