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 Alton Weather Forecast Summary |
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Today
Feb 17th
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Wednesday
Feb 18th
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Thursday
Feb 19th
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Friday
Feb 20th
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Saturday
Feb 21st
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Cloudy |
Cloudy |
Mostly Sunny |
Cloudy |
Cloudy |
57°F
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68°F
52°F |
73°F
47°F |
46°F
33°F |
33°F
29°F |
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| Alton Detailed Weather Forecast |
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| Tuesday, February 17th, 2026 |
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Evening |
Temperature: 57°F |
| Cloudy. Windy. |
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| Wednesday, February 18th, 2026 |
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Overnight |
Temperature: 57°F |
| Clear with cloudy periods with a slight chance of showers. Windy at times. |
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Morning |
Temperature: 64°F |
| Sunny with cloudy periods. Windy at times. |
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Afternoon |
Temperature: 58°F |
| Sunny. |
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Evening |
Temperature: 52°F |
| Cloudy. |
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| Thursday, February 19th, 2026 |
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Overnight |
Temperature: 49°F |
| Clear. |
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Morning |
Temperature: 65°F |
| Sunny with cloudy periods with a slight chance of showers or thundershowers. Windy. |
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Afternoon |
Temperature: 63°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 52°F |
| Mostly clear. Windy. |
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| Friday, February 20th, 2026 |
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Overnight |
Temperature: 36°F |
| Cloudy. Windy. |
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Morning |
Temperature: 41°F |
| A mix of cloud and sun. Windy. |
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Afternoon |
Temperature: 39°F |
| Sunny. |
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Evening |
Temperature: 34°F |
| Cloudy. |
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| Saturday, February 21st, 2026 |
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Overnight |
Temperature: 30°F |
| Cloudy. |
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Morning |
Temperature: 33°F |
| Cloudy with a chance of flurries or showers. Windy at times. |
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Afternoon |
Temperature: 32°F |
| Cloudy with a chance of flurries or showers. Windy at times. |
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Evening |
Temperature: 31°F |
| Cloudy. Windy at times. |
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| Sunday, February 22nd, 2026 |
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Overnight |
Temperature: 26°F |
| Clear. Windy at times. |
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Morning |
Temperature: 29°F |
| Cloudy. Windy. |
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Afternoon |
Temperature: 27°F |
| Sunny with cloudy periods. Windy. |
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Evening |
Temperature: 21°F |
| Clear with cloudy periods. Windy. |
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| Monday, February 23rd, 2026 |
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Overnight |
Temperature: 18°F |
| Clear. Windy. |
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Morning |
Temperature: 27°F |
| Sunny. Windy at times. |
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Afternoon |
Temperature: 27°F |
| Mostly sunny. |
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Evening |
Temperature: 24°F |
| Clear. |
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| Tuesday, February 24th, 2026 |
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Overnight |
Temperature: 23°F |
| Cloudy. |
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Morning |
Temperature: 38°F |
| Cloudy. Windy at times. |
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Afternoon |
Temperature: 37°F |
| Cloudy. Windy at times. |
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Evening |
Temperature: 34°F |
| Cloudy. Windy at times. |
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| Wednesday, February 25th, 2026 |
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Overnight |
Temperature: 35°F |
| Cloudy. Windy at times. |
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Morning |
Temperature: 49°F |
| Cloudy. Windy at times. |
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Afternoon |
Temperature: 49°F |
| Cloudy. |
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Evening |
Temperature: 46°F |
| Cloudy. |
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