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
| 13 May 2026 Wednesday 13.9 ° C / 57°F  Sunny |
Feels Like : 12.9 ° C / 55.3°F Humidity : % 69 Pressure : 1017 mb Wind Speed : 13 kmph / 8.1 miles from NW  Visibility : 16 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 13 May 2026 Wednesday | Sunny |
12.4 ° C (54.4°F) |
26.3 ° C (79.3°F) |
18.7 ° C (65.6°F) |
% 50 | 0% | 8 | Sunrise:05:52 AM Sunset: 08:06 PM |
Moonrise:03:40 AM Moonset: 04:42 PM Moon Phase ( Waning Crescent ) |
|
| 14 May 2026 Thursday | Sunny |
9.5 ° C (49.1°F) |
21.8 ° C (71.2°F) |
15.8 ° C (60.5°F) |
% 63 | 0% | 8.4 | Sunrise:05:51 AM Sunset: 08:07 PM |
Moonrise:04:06 AM Moonset: 05:56 PM Moon Phase ( Waning Crescent ) |
|
| 15 May 2026 Friday |  Patchy rain nearby |
13.8 ° C (56.9°F) |
30.8 ° C (87.4°F) |
22.3 ° C (72.2°F) |
% 62 | 85% | 0.2 | Sunrise:05:50 AM Sunset: 08:08 PM |
Moonrise:04:36 AM Moonset: 07:14 PM Moon Phase ( Waning Crescent ) |
|
| 16 May 2026 Saturday |  Heavy rain |
19.2 ° C (66.6°F) |
24.6 ° C (76.3°F) |
21.7 ° C (71°F) |
% 78 | 87% | 5 | Sunrise:05:49 AM Sunset: 08:09 PM |
Moonrise:05:13 AM Moonset: 08:34 PM Moon Phase ( New Moon ) |
|
| 17 May 2026 Sunday | Sunny |
17.8 ° C (64.1°F) |
31.7 ° C (89.1°F) |
23.2 ° C (73.7°F) |
% 68 | 0% | 6 | Sunrise:05:49 AM Sunset: 08:10 PM |
Moonrise:06:00 AM Moonset: 09:52 PM Moon Phase ( Waxing Crescent ) |
|
| 18 May 2026 Monday | Patchy rain nearby |
20.1 ° C (68.1°F) |
26.3 ° C (79.4°F) |
23 ° C (73.4°F) |
% 86 | 81% | 5 | Sunrise:05:48 AM Sunset: 08:11 PM |
Moonrise:06:58 AM Moonset: 11:01 PM Moon Phase ( Waxing Crescent ) |
|
| 19 May 2026 Tuesday | Patchy rain nearby |
19.6 ° C (67.3°F) |
28 ° C (82.5°F) |
21.9 ° C (71.4°F) |
% 89 | 88% | 5 | Sunrise:05:47 AM Sunset: 08:12 PM |
Moonrise:08:07 AM Moonset: 11:58 PM Moon Phase ( Waxing Crescent ) |
|
| 20 May 2026 Wednesday | Patchy rain nearby |
14.3 ° C (57.8°F) |
24.9 ° C (76.8°F) |
19.4 ° C (67°F) |
% 76 | 80% | 4 | Sunrise:05:46 AM Sunset: 08:12 PM |
Moonrise:09:22 AM Moonset: No moonset Moon Phase ( Waxing Crescent ) |
|
| 21 May 2026 Thursday | Sunny |
16 ° C (60.8°F) |
28.3 ° C (82.9°F) |
21.4 ° C (70.6°F) |
% 71 | 0% | 6 | Sunrise:05:46 AM Sunset: 08:13 PM |
Moonrise:10:38 AM Moonset: 12:42 AM Moon Phase ( Waxing Crescent ) |
|
| 22 May 2026 Friday | Patchy rain nearby |
14.8 ° C (58.7°F) |
25.4 ° C (77.8°F) |
20.5 ° C (68.9°F) |
% 79 | 88% | 5 | Sunrise:05:45 AM Sunset: 08:14 PM |
Moonrise:11:51 AM Moonset: 01:17 AM Moon Phase ( Waxing Crescent ) |
|
| 23 May 2026 Saturday | Sunny |
10.6 ° C (51°F) |
18.9 ° C (66°F) |
14.4 ° C (57.8°F) |
% 61 | 0% | 4 | Sunrise:05:44 AM Sunset: 08:15 PM |
Moonrise:12:59 PM Moonset: 01:46 AM Moon Phase ( First Quarter ) |
|
| 24 May 2026 Sunday | Sunny |
7.4 ° C (45.3°F) |
22.3 ° C (72.1°F) |
14.7 ° C (58.5°F) |
% 59 | 0% | 4 | Sunrise:05:44 AM Sunset: 08:16 PM |
Moonrise:02:04 PM Moonset: 02:10 AM Moon Phase ( Waxing Gibbous ) |
|
| 25 May 2026 Monday | Sunny |
13.3 ° C (55.9°F) |
26.9 ° C (80.4°F) |
19.3 ° C (66.8°F) |
% 59 | 0% | 5 | Sunrise:05:43 AM Sunset: 08:16 PM |
Moonrise:03:07 PM Moonset: 02:33 AM Moon Phase ( Waxing Gibbous ) |
|
| 26 May 2026 Tuesday | Patchy rain nearby |
15 ° C (59°F) |
24.6 ° C (76.3°F) |
19.7 ° C (67.5°F) |
% 73 | 83% | 4 | Sunrise:05:42 AM Sunset: 08:17 PM |
Moonrise:04:09 PM Moonset: 02:55 AM Moon Phase ( Waxing Gibbous ) |
|
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