Current conditions and the National Weather Service 7-day forecast for O'Fallon, Illinois — temperature, rain chance, wind, radar and active alerts.
Saturday Aug 29 night: a low around 65°F. Sunday Aug 30: a high near 95°F and a low around 73°F. Highs over the period run 95°F to 101°F.
| Day | High | Low | Precip |
|---|---|---|---|
| Saturday Aug 29 | — | 65° | — |
| Sunday Aug 30 | 95° | 73° | — |
| Monday Aug 31 | 99° | 76° | — |
| Tuesday Sep 1 | 101° | 78° | — |
| Wednesday Sep 2 | 101° | 79° | — |
| Thursday Sep 3 | 100° | 76° | — |
| Friday Sep 4 | 97° | 74° | — |
| Saturday Sep 5 | 95° | — | — |