Port Costa Weather Forecast 15 Days, Weather in Port Costa Today
Current weather conditions and 15 day weather forecast for Port Costa, 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 Port Costa
| 21 December 2025 Sunday 16.1 ° C / 61°F  Mist |
Feels Like : 16.1 ° C / 61°F Humidity : % 93 Pressure : 1015 mb Wind Speed : 19.8 kmph / 12.3 miles from SSW  Visibility : 9.7 km Precipitation (rainfall) : 0.06 mm Cloud (%) : 100 |
15 day weather forecast for Port Costa, CA, USA
Weather Forecast for next 15 Days for Port Costa 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 Port Costa, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 21 December 2025 Sunday |  Heavy rain |
13.4 ° C (56.2°F) |
16.2 ° C (61.2°F) |
14.8 ° C (58.7°F) |
% 94 | 87% | 0.1 | Sunrise:07:21 AM Sunset: 04:52 PM |
Moonrise:08:59 AM Moonset: 06:20 PM Moon Phase ( Waxing Crescent ) |
|
| 22 December 2025 Monday | Heavy rain |
11.8 ° C (53.3°F) |
13.3 ° C (55.9°F) |
12.8 ° C (55.1°F) |
% 98 | 89% | 0.2 | Sunrise:07:22 AM Sunset: 04:53 PM |
Moonrise:09:37 AM Moonset: 07:24 PM Moon Phase ( Waxing Crescent ) |
|
| 23 December 2025 Tuesday | Heavy rain |
10.4 ° C (50.7°F) |
14.1 ° C (57.4°F) |
11.7 ° C (53.1°F) |
% 94 | 77% | 0.1 | Sunrise:07:22 AM Sunset: 04:53 PM |
Moonrise:10:09 AM Moonset: 08:29 PM Moon Phase ( Waxing Crescent ) |
|
| 24 December 2025 Wednesday | Heavy rain |
10.1 ° C (50.3°F) |
13.2 ° C (55.8°F) |
12.1 ° C (53.7°F) |
% 85 | 89% | 0.3 | Sunrise:07:23 AM Sunset: 04:54 PM |
Moonrise:10:36 AM Moonset: 09:34 PM Moon Phase ( Waxing Crescent ) |
|
| 25 December 2025 Thursday | Heavy rain |
10.7 ° C (51.3°F) |
13.4 ° C (56.2°F) |
12.3 ° C (54.2°F) |
% 77 | 87% | 0 | Sunrise:07:23 AM Sunset: 04:54 PM |
Moonrise:11:01 AM Moonset: 10:38 PM Moon Phase ( Waxing Crescent ) |
|
| 26 December 2025 Friday |  Patchy rain nearby |
10.3 ° C (50.6°F) |
14.1 ° C (57.4°F) |
11.7 ° C (53°F) |
% 77 | 82% | 3 | Sunrise:07:23 AM Sunset: 04:55 PM |
Moonrise:11:25 AM Moonset: 11:45 PM Moon Phase ( Waxing Crescent ) |
|
| 27 December 2025 Saturday | Patchy rain nearby |
8.3 ° C (47°F) |
12.2 ° C (54°F) |
9.9 ° C (49.9°F) |
% 82 | 87% | 2 | Sunrise:07:24 AM Sunset: 04:56 PM |
Moonrise:11:49 AM Moonset: No moonset Moon Phase ( First Quarter ) |
|
| 28 December 2025 Sunday |  Partly Cloudy |
7 ° C (44.6°F) |
13.2 ° C (55.8°F) |
9.8 ° C (49.6°F) |
% 77 | 0% | 3 | Sunrise:07:24 AM Sunset: 04:57 PM |
Moonrise:12:15 PM Moonset: 12:52 AM Moon Phase ( Waxing Gibbous ) |
|
| 29 December 2025 Monday |  Sunny |
6.2 ° C (43.1°F) |
12.3 ° C (54.1°F) |
8.9 ° C (48°F) |
% 76 | 0% | 3 | Sunrise:07:24 AM Sunset: 04:57 PM |
Moonrise:12:45 PM Moonset: 02:04 AM Moon Phase ( Waxing Gibbous ) |
|
| 30 December 2025 Tuesday | Patchy rain nearby |
5.9 ° C (42.7°F) |
11.5 ° C (52.7°F) |
8.7 ° C (47.7°F) |
% 78 | 71% | 2 | Sunrise:07:25 AM Sunset: 04:58 PM |
Moonrise:01:21 PM Moonset: 03:19 AM Moon Phase ( Waxing Gibbous ) |
|
| 31 December 2025 Wednesday | Patchy rain nearby |
7.5 ° C (45.5°F) |
12.3 ° C (54.2°F) |
10 ° C (49.9°F) |
% 73 | 85% | 2 | Sunrise:07:25 AM Sunset: 04:59 PM |
Moonrise:02:07 PM Moonset: 04:37 AM Moon Phase ( Waxing Gibbous ) |
|
| 01 January 2026 Thursday |  Overcast |
4.7 ° C (40.4°F) |
10.9 ° C (51.7°F) |
7.4 ° C (45.3°F) |
% 59 | 0% | 2 | Sunrise:07:25 AM Sunset: 05:00 PM |
Moonrise:03:04 PM Moonset: 05:54 AM Moon Phase ( Waxing Gibbous ) |
|
| 02 January 2026 Friday | Partly Cloudy |
4.2 ° C (39.6°F) |
10.6 ° C (51°F) |
7.5 ° C (45.5°F) |
% 58 | 0% | 3 | Sunrise:07:25 AM Sunset: 05:00 PM |
Moonrise:04:12 PM Moonset: 07:03 AM Moon Phase ( Waxing Gibbous ) |
|
| 03 January 2026 Saturday | Patchy rain nearby |
5.9 ° C (42.5°F) |
13.3 ° C (55.9°F) |
9.6 ° C (49.3°F) |
% 61 | 85% | 2 | Sunrise:07:25 AM Sunset: 05:01 PM |
Moonrise:05:28 PM Moonset: 08:01 AM Moon Phase ( Full Moon ) |
|
Add a link to your web page; copy and paste this html to your web page