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 Alton Weather Forecast Summary |
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Today
Sep 15th
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Tuesday
Sep 16th
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Wednesday
Sep 17th
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Thursday
Sep 18th
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Friday
Sep 19th
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Mostly Sunny |
Mostly Sunny |
Cloudy |
Sunny |
Thundershowers |
78°F
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81°F
58°F |
83°F
60°F |
81°F
57°F |
87°F
59°F |
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| Alton Detailed Weather Forecast |
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| Monday, September 15th, 2025 |
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Overnight |
Temperature: 57°F |
| Clear. Windy at times. |
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Morning |
Temperature: 74°F |
| Sunny. Windy at times. |
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Afternoon |
Temperature: 75°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 62°F |
| Mostly clear. Windy. |
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| Tuesday, September 16th, 2025 |
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Overnight |
Temperature: 58°F |
| Clear with cloudy periods. Windy at times. |
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Morning |
Temperature: 75°F |
| Sunny. Windy. |
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Afternoon |
Temperature: 77°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 67°F |
| Clear with cloudy periods. Windy. |
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| Wednesday, September 17th, 2025 |
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Overnight |
Temperature: 65°F |
| Cloudy. Windy. |
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Morning |
Temperature: 75°F |
| Cloudy. Windy. |
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Afternoon |
Temperature: 78°F |
| Sunny. Slight chance of a thunderstorm. Windy at times. |
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Evening |
Temperature: 62°F |
| Clear. Windy at times. |
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| Thursday, September 18th, 2025 |
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Overnight |
Temperature: 58°F |
| Clear. Windy at times. |
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Morning |
Temperature: 76°F |
| Sunny. |
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Afternoon |
Temperature: 77°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 63°F |
| Clear. Windy at times. |
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| Friday, September 19th, 2025 |
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Overnight |
Temperature: 61°F |
| Clear. Windy at times. |
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Morning |
Temperature: 82°F |
| Sunny with cloudy periods. Chance of a thunderstorm. Windy at times. |
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Afternoon |
Temperature: 77°F |
| Cloudy with a chance of showers. Slight chance of a thunderstorm. Windy at times. |
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Evening |
Temperature: 66°F |
| Cloudy with a few showers. Slight chance of a thunderstorm. |
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| Saturday, September 20th, 2025 |
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Overnight |
Temperature: 62°F |
| Cloudy with a few showers. |
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Morning |
Temperature: 71°F |
| Cloudy with a chance of showers. Slight chance of a thunderstorm. Windy. |
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Afternoon |
Temperature: 73°F |
| Sunny with a chance of showers. Windy at times. |
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Evening |
Temperature: 60°F |
| Clear. Windy at times. |
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| Sunday, September 21st, 2025 |
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Overnight |
Temperature: 55°F |
| Clear. |
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Morning |
Temperature: 71°F |
| Sunny. Windy at times. |
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Afternoon |
Temperature: 71°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 60°F |
| Clear. |
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| Monday, September 22nd, 2025 |
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Overnight |
Temperature: 56°F |
| Clear. |
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Morning |
Temperature: 71°F |
| Sunny. |
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Afternoon |
Temperature: 72°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 60°F |
| Clear. Windy at times. |
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| Tuesday, September 23rd, 2025 |
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Overnight |
Temperature: 57°F |
| Clear. |
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Morning |
Temperature: 71°F |
| Sunny. Windy. |
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Afternoon |
Temperature: 68°F |
| Sunny. Windy. |
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Evening |
Temperature: 53°F |
| Clear. Windy at times. |
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