Castro Valley Weather Forecast 15 Days, Weather in Castro Valley Today
Current weather conditions and 15 day weather forecast for Castro Valley, California, USA including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain risk, wind speed, cloud, pressure, and UV index.
Current weather conditions at Castro Valley
| 12 February 2026 Thursday 12.2 ° C / 54°F  Overcast |
Feels Like : 11.6 ° C / 52.9°F Humidity : % 74 Pressure : 1021 mb Wind Speed : 7.9 kmph / 4.9 miles from ESE  Visibility : 16 km Precipitation (rainfall) : 0 mm Cloud (%) : 100 |
15 day weather forecast for Castro Valley, CA, USA
Weather Forecast for next 15 Days for Castro Valley including weather warnings, temperature, rain, wind speed, cloud, snow, wind speed and wind direction, pressure and UV index.Here is weather for the next 15 days in Castro Valley, California state, US. To see the daily forecast, scroll to the table below.
| Date | Weather forecast | Low temperature | High temperature | Avg. temperature | Humidity | Chance of rain | UV Index | Sun Position | Moon Position | |
|---|---|---|---|---|---|---|---|---|---|---|
| 11 February 2026 Wednesday |  Patchy rain nearby |
10.4 ° C (50.7°F) |
15.4 ° C (59.7°F) |
12.1 ° C (53.8°F) |
% 83 | 88% | 0.4 | Sunrise:07:02 AM Sunset: 05:44 PM |
Moonrise:03:05 AM Moonset: 12:09 PM Moon Phase ( Waning Crescent ) |
|
| 12 February 2026 Thursday | Patchy rain nearby |
8.6 ° C (47.5°F) |
16.7 ° C (62.1°F) |
12.2 ° C (53.9°F) |
% 79 | 89% | 0.6 | Sunrise:07:01 AM Sunset: 05:45 PM |
Moonrise:04:00 AM Moonset: 01:00 PM Moon Phase ( Waning Crescent ) |
|
| 13 February 2026 Friday |  Fog |
5.1 ° C (41.2°F) |
13.8 ° C (56.8°F) |
9 ° C (48.2°F) |
% 92 | 0% | 0.8 | Sunrise:07:00 AM Sunset: 05:46 PM |
Moonrise:04:50 AM Moonset: 01:58 PM Moon Phase ( Waning Crescent ) |
|
| 14 February 2026 Saturday | Fog |
6.9 ° C (44.4°F) |
11 ° C (51.8°F) |
8.9 ° C (48°F) |
% 94 | 0% | 0.7 | Sunrise:06:59 AM Sunset: 05:47 PM |
Moonrise:05:33 AM Moonset: 03:01 PM Moon Phase ( Waning Crescent ) |
|
| 15 February 2026 Sunday |  Moderate rain |
7.8 ° C (46°F) |
14.6 ° C (58.2°F) |
11.2 ° C (52.2°F) |
% 79 | 89% | 0.6 | Sunrise:06:58 AM Sunset: 05:48 PM |
Moonrise:06:09 AM Moonset: 04:07 PM Moon Phase ( Waning Crescent ) |
|
| 16 February 2026 Monday | Moderate rain |
7.7 ° C (45.9°F) |
12.2 ° C (54°F) |
9.8 ° C (49.6°F) |
% 85 | 75% | 0 | Sunrise:06:56 AM Sunset: 05:49 PM |
Moonrise:06:40 AM Moonset: 05:14 PM Moon Phase ( Waning Crescent ) |
|
| 17 February 2026 Tuesday | Patchy rain nearby |
6.3 ° C (43.3°F) |
9.6 ° C (49.3°F) |
7.8 ° C (46.1°F) |
% 85 | 81% | 2 | Sunrise:06:55 AM Sunset: 05:50 PM |
Moonrise:07:08 AM Moonset: 06:20 PM Moon Phase ( New Moon ) |
|
| 18 February 2026 Wednesday | Patchy rain nearby |
5.1 ° C (41.2°F) |
11.6 ° C (52.9°F) |
8.4 ° C (47.1°F) |
% 73 | 87% | 2 | Sunrise:06:54 AM Sunset: 05:51 PM |
Moonrise:07:34 AM Moonset: 07:28 PM Moon Phase ( Waxing Crescent ) |
|
| 19 February 2026 Thursday | Patchy rain nearby |
5.5 ° C (41.8°F) |
11.6 ° C (52.9°F) |
8.2 ° C (46.8°F) |
% 81 | 87% | 2 | Sunrise:06:53 AM Sunset: 05:52 PM |
Moonrise:07:58 AM Moonset: 08:35 PM Moon Phase ( Waxing Crescent ) |
|
| 20 February 2026 Friday |  Partly Cloudy |
6.6 ° C (43.9°F) |
13.6 ° C (56.4°F) |
9.3 ° C (48.7°F) |
% 71 | 0% | 3 | Sunrise:06:51 AM Sunset: 05:53 PM |
Moonrise:08:23 AM Moonset: 09:45 PM Moon Phase ( Waxing Crescent ) |
|
| 21 February 2026 Saturday | Patchy rain nearby |
5.6 ° C (42°F) |
15.1 ° C (59.1°F) |
9.8 ° C (49.6°F) |
% 76 | 76% | 2 | Sunrise:06:50 AM Sunset: 05:54 PM |
Moonrise:08:50 AM Moonset: 10:56 PM Moon Phase ( Waxing Crescent ) |
|
| 22 February 2026 Sunday | Patchy rain nearby |
7.9 ° C (46.2°F) |
10 ° C (50.1°F) |
8.8 ° C (47.9°F) |
% 91 | 84% | 2 | Sunrise:06:49 AM Sunset: 05:55 PM |
Moonrise:09:22 AM Moonset: No moonset Moon Phase ( Waxing Crescent ) |
|
| 23 February 2026 Monday | Partly Cloudy |
8 ° C (46.5°F) |
14.4 ° C (58°F) |
10.3 ° C (50.5°F) |
% 81 | 0% | 4 | Sunrise:06:48 AM Sunset: 05:56 PM |
Moonrise:09:59 AM Moonset: 12:09 AM Moon Phase ( Waxing Crescent ) |
|
| 24 February 2026 Tuesday |  Sunny |
6.6 ° C (43.9°F) |
14.6 ° C (58.2°F) |
10.1 ° C (50.1°F) |
% 80 | 0% | 4 | Sunrise:06:46 AM Sunset: 05:57 PM |
Moonrise:10:45 AM Moonset: 01:24 AM Moon Phase ( First Quarter ) |
|
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