St. Clair Weather Forecast 15 Days, Weather in St. Clair Today
Current weather conditions and 15 day weather forecast for St. Clair, Illinois, 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 St. Clair
| 25 December 2025 Thursday 12 ° C / 53.6°F  Mist |
Feels Like : 11.3 ° C / 52.4°F Humidity : % 100 Pressure : 1018 mb Wind Speed : 8.3 kmph / 5.1 miles from SW  Visibility : 1.2 km Precipitation (rainfall) : 0 mm Cloud (%) : 75 |
15 day weather forecast for St. Clair, IL, USA
Weather Forecast for next 15 Days for St. Clair 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 St. Clair, Illinois 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 25 December 2025 Thursday |  Patchy rain nearby |
11.9 ° C (53.4°F) |
17.8 ° C (64°F) |
14.7 ° C (58.5°F) |
% 94 | 89% | 0.4 | Sunrise:07:16 AM Sunset: 04:45 PM |
Moonrise:10:51 AM Moonset: 10:24 PM Moon Phase ( Waxing Crescent ) |
|
| 26 December 2025 Friday |  Overcast |
8.6 ° C (47.5°F) |
16.2 ° C (61.2°F) |
13.8 ° C (56.8°F) |
% 89 | 0% | 0.5 | Sunrise:07:16 AM Sunset: 04:45 PM |
Moonrise:11:15 AM Moonset: 11:31 PM Moon Phase ( Waxing Crescent ) |
|
| 27 December 2025 Saturday | Overcast |
6 ° C (42.8°F) |
13.5 ° C (56.3°F) |
9.9 ° C (49.8°F) |
% 94 | 0% | 0.4 | Sunrise:07:17 AM Sunset: 04:46 PM |
Moonrise:11:39 AM Moonset: No moonset Moon Phase ( First Quarter ) |
|
| 28 December 2025 Sunday |  Moderate rain |
0.5 ° C (32.9°F) |
17.9 ° C (64.2°F) |
11.5 ° C (52.6°F) |
% 83 | 79% | 0.3 | Sunrise:07:17 AM Sunset: 04:47 PM |
Moonrise:12:04 PM Moonset: 12:38 AM Moon Phase ( Waxing Gibbous ) |
|
| 29 December 2025 Monday |  Sunny |
-4.5 ° C (23.9°F) |
-0.4 ° C (31.2°F) |
-2.7 ° C (27.1°F) |
% 43 | 0% | 0 | Sunrise:07:17 AM Sunset: 04:47 PM |
Moonrise:12:33 PM Moonset: 01:50 AM Moon Phase ( Waxing Gibbous ) |
|
| 30 December 2025 Tuesday | Sunny |
-4.6 ° C (23.7°F) |
4.9 ° C (40.8°F) |
-0.7 ° C (30.7°F) |
% 36 | 0% | 2 | Sunrise:07:17 AM Sunset: 04:48 PM |
Moonrise:01:08 PM Moonset: 03:05 AM Moon Phase ( Waxing Gibbous ) |
|
| 31 December 2025 Wednesday |  Partly Cloudy |
-0.2 ° C (31.6°F) |
10.3 ° C (50.5°F) |
4.3 ° C (39.7°F) |
% 59 | 0% | 2 | Sunrise:07:18 AM Sunset: 04:49 PM |
Moonrise:01:52 PM Moonset: 04:23 AM Moon Phase ( Waxing Gibbous ) |
|
| 01 January 2026 Thursday | Sunny |
0.1 ° C (32.2°F) |
7.3 ° C (45.1°F) |
4.1 ° C (39.4°F) |
% 68 | 0% | 2 | Sunrise:07:18 AM Sunset: 04:50 PM |
Moonrise:02:48 PM Moonset: 05:41 AM Moon Phase ( Waxing Gibbous ) |
|
| 02 January 2026 Friday | Sunny |
-3.7 ° C (25.4°F) |
3.1 ° C (37.7°F) |
-1.1 ° C (30.1°F) |
% 57 | 0% | 2 | Sunrise:07:18 AM Sunset: 04:51 PM |
Moonrise:03:56 PM Moonset: 06:51 AM Moon Phase ( Waxing Gibbous ) |
|
| 03 January 2026 Saturday | Patchy rain nearby |
-1.3 ° C (29.6°F) |
5.2 ° C (41.3°F) |
3.2 ° C (37.8°F) |
% 64 | 89% | 1 | Sunrise:07:18 AM Sunset: 04:51 PM |
Moonrise:05:11 PM Moonset: 07:50 AM Moon Phase ( Full Moon ) |
|
| 04 January 2026 Sunday | Patchy rain nearby |
11.1 ° C (52°F) |
15.5 ° C (59.9°F) |
13.4 ° C (56.1°F) |
% 92 | 85% | 3 | Sunrise:07:18 AM Sunset: 04:52 PM |
Moonrise:06:27 PM Moonset: 08:36 AM Moon Phase ( Waning Gibbous ) |
|
| 05 January 2026 Monday | Patchy rain nearby |
13.5 ° C (56.2°F) |
18.7 ° C (65.7°F) |
15.2 ° C (59.4°F) |
% 92 | 88% | 4 | Sunrise:07:18 AM Sunset: 04:53 PM |
Moonrise:07:42 PM Moonset: 09:13 AM Moon Phase ( Waning Gibbous ) |
|
| 06 January 2026 Tuesday | Overcast |
4.1 ° C (39.5°F) |
11.9 ° C (53.4°F) |
9.7 ° C (49.4°F) |
% 85 | 0% | 2 | Sunrise:07:18 AM Sunset: 04:54 PM |
Moonrise:08:52 PM Moonset: 09:43 AM Moon Phase ( Waning Gibbous ) |
|
| 07 January 2026 Wednesday | Partly Cloudy |
0.6 ° C (33.1°F) |
6.6 ° C (43.9°F) |
3.1 ° C (37.5°F) |
% 70 | 0% | 2 | Sunrise:07:18 AM Sunset: 04:55 PM |
Moonrise:09:58 PM Moonset: 10:08 AM Moon Phase ( Waning Gibbous ) |
|
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