Current conditions and the National Weather Service 7-day forecast for Alton, Illinois — temperature, rain chance, wind, radar and active alerts.
Saturday Aug 29 night: a low around 64°F. Sunday Aug 30: a high near 97°F and a low around 74°F. Highs over the period run 96°F to 102°F.
| Day | High | Low | Precip |
|---|---|---|---|
| Saturday Aug 29 | — | 64° | — |
| Sunday Aug 30 | 97° | 74° | — |
| Monday Aug 31 | 100° | 78° | — |
| Tuesday Sep 1 | 102° | 80° | — |
| Wednesday Sep 2 | 102° | 80° | — |
| Thursday Sep 3 | 101° | 77° | — |
| Friday Sep 4 | 97° | 75° | — |
| Saturday Sep 5 | 96° | — | — |