O'Fallon Weather Forecast 15 Days, Weather in O'Fallon Today
Current weather conditions and 15 day weather forecast for O'Fallon, Missouri, 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
| 11 August 2026 Tuesday 32.9 ° C / 91.3°F  Sunny |
Feels Like : 37 ° C / 98.6°F Humidity : % 56 Pressure : 1014 mb Wind Speed : 22 kmph / 13.6 miles from SW  Visibility : 16.1 km Precipitation (rainfall) : 0 mm Cloud (%) : 0 |
15 day weather forecast for O'Fallon, MO, 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, Missouri 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 August 2026 Tuesday | Sunny |
24.7 ° C (76.5°F) |
38.7 ° C (101.7°F) |
30.7 ° C (87.2°F) |
% 65 | 4% | 8.2 | Sunrise:06:13 AM Sunset: 08:02 PM |
Moonrise:04:16 AM Moonset: 07:26 PM Moon Phase ( New Moon ) |
|
| 12 August 2026 Wednesday | Sunny |
26.6 ° C (79.9°F) |
36.1 ° C (97°F) |
30.4 ° C (86.7°F) |
% 54 | 36% | 4 | Sunrise:06:13 AM Sunset: 08:01 PM |
Moonrise:05:37 AM Moonset: 08:02 PM Moon Phase ( New Moon ) |
|
| 13 August 2026 Thursday | Sunny |
23.5 ° C (74.4°F) |
40.1 ° C (104.1°F) |
30.6 ° C (87°F) |
% 64 | 36% | 7.6 | Sunrise:06:14 AM Sunset: 08:00 PM |
Moonrise:06:57 AM Moonset: 08:32 PM Moon Phase ( New Moon ) |
|
| 14 August 2026 Friday | Sunny |
23.3 ° C (73.9°F) |
33.1 ° C (91.6°F) |
27.6 ° C (81.8°F) |
% 74 | 8% | 7.2 | Sunrise:06:15 AM Sunset: 07:59 PM |
Moonrise:08:14 AM Moonset: 08:59 PM Moon Phase ( Waxing Crescent ) |
|
| 15 August 2026 Saturday | Sunny |
25.2 ° C (77.3°F) |
41.5 ° C (106.6°F) |
32.8 ° C (91.1°F) |
% 49 | 2% | 10 | Sunrise:06:16 AM Sunset: 07:57 PM |
Moonrise:09:28 AM Moonset: 09:25 PM Moon Phase ( Waxing Crescent ) |
|
| 16 August 2026 Sunday | Sunny |
24.8 ° C (76.6°F) |
38.5 ° C (101.3°F) |
31.3 ° C (88.4°F) |
% 45 | 57% | 9 | Sunrise:06:17 AM Sunset: 07:56 PM |
Moonrise:10:40 AM Moonset: 09:51 PM Moon Phase ( Waxing Crescent ) |
|
| 17 August 2026 Monday | Sunny |
20.6 ° C (69.1°F) |
29.9 ° C (85.9°F) |
24.7 ° C (76.4°F) |
% 72 | 57% | 7 | Sunrise:06:18 AM Sunset: 07:55 PM |
Moonrise:11:50 AM Moonset: 10:20 PM Moon Phase ( Waxing Crescent ) |
|
| 18 August 2026 Tuesday | Sunny |
19.6 ° C (67.3°F) |
33 ° C (91.4°F) |
25.8 ° C (78.5°F) |
% 66 | 57% | 8 | Sunrise:06:19 AM Sunset: 07:53 PM |
Moonrise:01:00 PM Moonset: 10:51 PM Moon Phase ( First Quarter ) |
|
| 19 August 2026 Wednesday | Sunny |
22 ° C (71.6°F) |
37 ° C (98.5°F) |
28.1 ° C (82.6°F) |
% 57 | 4% | 9 | Sunrise:06:20 AM Sunset: 07:52 PM |
Moonrise:02:07 PM Moonset: 11:29 PM Moon Phase ( First Quarter ) |
|
| 20 August 2026 Thursday | Sunny |
21.5 ° C (70.8°F) |
38.8 ° C (101.8°F) |
29.4 ° C (84.9°F) |
% 56 | 2% | 9 | Sunrise:06:21 AM Sunset: 07:51 PM |
Moonrise:03:11 PM Moonset: Does not set today Moon Phase ( First Quarter ) |
|
| 21 August 2026 Friday | Sunny |
24.2 ° C (75.5°F) |
41.5 ° C (106.8°F) |
32.2 ° C (90°F) |
% 40 | 57% | 10 | Sunrise:06:22 AM Sunset: 07:49 PM |
Moonrise:04:09 PM Moonset: 12:12 AM Moon Phase ( First Quarter ) |
|
| 22 August 2026 Saturday | Sunny |
22.1 ° C (71.8°F) |
31.1 ° C (88°F) |
25.6 ° C (78.1°F) |
% 72 | 57% | 8 | Sunrise:06:23 AM Sunset: 07:48 PM |
Moonrise:04:59 PM Moonset: 01:02 AM Moon Phase ( Waxing Gibbous ) |
|
| 23 August 2026 Sunday | Sunny |
15.2 ° C (59.4°F) |
25.2 ° C (77.3°F) |
20.6 ° C (69.1°F) |
% 50 | 2% | 7 | Sunrise:06:23 AM Sunset: 07:46 PM |
Moonrise:05:42 PM Moonset: 01:59 AM Moon Phase ( Waxing Gibbous ) |
|
| 24 August 2026 Monday | Sunny |
10.1 ° C (50.2°F) |
25.6 ° C (78.1°F) |
17.8 ° C (64°F) |
% 55 | 2% | 7 | Sunrise:06:24 AM Sunset: 07:45 PM |
Moonrise:06:17 PM Moonset: 02:58 AM Moon Phase ( Waxing Gibbous ) |
|
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