O'Fallon Weather Forecast 15 Days, Weather in O'Fallon Today
Current weather conditions and 15 day weather forecast for O'Fallon, 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 O'Fallon
| 09 February 2026 Monday -3.1 ° C / 26.4°F  Clear |
Feels Like : -6.7 ° C / 19.9°F Humidity : % 75 Pressure : 1020 mb Wind Speed : 9 kmph / 5.6 miles from ESE  Visibility : 16 km Precipitation (rainfall) : 0 mm Cloud (%) : 0 |
15 day weather forecast for O'Fallon, IL, USA
Weather Forecast for next 15 Days for O'Fallon 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 O'Fallon, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 09 February 2026 Monday | Sunny |
-5 ° C (23°F) |
14.7 ° C (58.5°F) |
1.9 ° C (35.5°F) |
% 73 | 0% | 0.6 | Sunrise:06:57 AM Sunset: 05:31 PM |
Moonrise:12:53 AM Moonset: 10:34 AM Moon Phase ( Last Quarter ) |
|
| 10 February 2026 Tuesday |  Fog |
-1.9 ° C (28.6°F) |
3.6 ° C (38.5°F) |
2.3 ° C (36.2°F) |
% 98 | 0% | 0.7 | Sunrise:06:56 AM Sunset: 05:32 PM |
Moonrise:01:55 AM Moonset: 11:10 AM Moon Phase ( Waning Crescent ) |
|
| 11 February 2026 Wednesday |  Mist |
-4.8 ° C (23.4°F) |
1.1 ° C (34°F) |
-2 ° C (28.4°F) |
% 96 | 0% | 0.7 | Sunrise:06:55 AM Sunset: 05:33 PM |
Moonrise:02:54 AM Moonset: 11:53 AM Moon Phase ( Waning Crescent ) |
|
| 12 February 2026 Thursday |  Patchy rain nearby |
-2 ° C (28.4°F) |
7 ° C (44.6°F) |
2.5 ° C (36.5°F) |
% 68 | 64% | 0.3 | Sunrise:06:53 AM Sunset: 05:34 PM |
Moonrise:03:50 AM Moonset: 12:43 PM Moon Phase ( Waning Crescent ) |
|
| 13 February 2026 Friday |  Moderate rain |
1.2 ° C (34.1°F) |
2.9 ° C (37.2°F) |
2.1 ° C (35.7°F) |
% 92 | 82% | 0 | Sunrise:06:52 AM Sunset: 05:36 PM |
Moonrise:04:40 AM Moonset: 01:41 PM Moon Phase ( Waning Crescent ) |
|
| 14 February 2026 Saturday | Patchy rain nearby |
3.2 ° C (37.7°F) |
6.8 ° C (44.3°F) |
4.6 ° C (40.4°F) |
% 93 | 55% | 1 | Sunrise:06:51 AM Sunset: 05:37 PM |
Moonrise:05:23 AM Moonset: 02:44 PM Moon Phase ( Waning Crescent ) |
|
| 15 February 2026 Sunday | Sunny |
1.8 ° C (35.2°F) |
13 ° C (55.4°F) |
6.7 ° C (44°F) |
% 80 | 0% | 3 | Sunrise:06:50 AM Sunset: 05:38 PM |
Moonrise:06:00 AM Moonset: 03:50 PM Moon Phase ( Waning Crescent ) |
|
| 16 February 2026 Monday | Sunny |
6 ° C (42.8°F) |
16.9 ° C (62.5°F) |
11 ° C (51.8°F) |
% 77 | 0% | 4 | Sunrise:06:49 AM Sunset: 05:39 PM |
Moonrise:06:30 AM Moonset: 04:57 PM Moon Phase ( Waning Crescent ) |
|
| 17 February 2026 Tuesday |  Partly Cloudy |
11.3 ° C (52.4°F) |
21.7 ° C (71.1°F) |
16 ° C (60.7°F) |
% 76 | 0% | 5 | Sunrise:06:47 AM Sunset: 05:40 PM |
Moonrise:06:58 AM Moonset: 06:05 PM Moon Phase ( New Moon ) |
|
| 18 February 2026 Wednesday | Patchy rain nearby |
14.9 ° C (58.9°F) |
22.3 ° C (72.2°F) |
18.3 ° C (64.9°F) |
% 83 | 87% | 4 | Sunrise:06:46 AM Sunset: 05:41 PM |
Moonrise:07:23 AM Moonset: 07:12 PM Moon Phase ( Waxing Crescent ) |
|
| 19 February 2026 Thursday | Patchy rain nearby |
7.1 ° C (44.8°F) |
19.6 ° C (67.3°F) |
16.5 ° C (61.8°F) |
% 65 | 83% | 4 | Sunrise:06:45 AM Sunset: 05:42 PM |
Moonrise:07:47 AM Moonset: 08:20 PM Moon Phase ( Waxing Crescent ) |
|
| 20 February 2026 Friday | Patchy rain nearby |
3.9 ° C (39.1°F) |
11.6 ° C (52.8°F) |
7.2 ° C (44.9°F) |
% 70 | 85% | 2 | Sunrise:06:44 AM Sunset: 05:43 PM |
Moonrise:08:11 AM Moonset: 09:31 PM Moon Phase ( Waxing Crescent ) |
|
| 21 February 2026 Saturday | Moderate rain |
7.7 ° C (45.9°F) |
18.2 ° C (64.7°F) |
12.1 ° C (53.8°F) |
% 84 | 89% | 3 | Sunrise:06:42 AM Sunset: 05:44 PM |
Moonrise:08:37 AM Moonset: 10:42 PM Moon Phase ( Waxing Crescent ) |
|
| 22 February 2026 Sunday | Patchy rain nearby |
1 ° C (33.7°F) |
3.9 ° C (38.9°F) |
3 ° C (37.3°F) |
% 69 | 85% | 1 | Sunrise:06:41 AM Sunset: 05:45 PM |
Moonrise:09:08 AM Moonset: 11:57 PM Moon Phase ( Waxing Crescent ) |
|
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