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 Alton Weather Forecast Summary |
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Today
Dec 13th
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Sunday
Dec 14th
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Monday
Dec 15th
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Tuesday
Dec 16th
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Wednesday
Dec 17th
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Flurries |
Mix of Sun and Cloud |
Cloudy |
Cloudy |
Cloudy |
8°F
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16°F
-20°F |
28°F
15°F |
36°F
17°F |
39°F
25°F |
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| Alton Detailed Weather Forecast |
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| Saturday, December 13th, 2025 |
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Afternoon |
Temperature: -4°F |
| Sunny. |
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Evening |
Temperature: -9°F |
| Clear. |
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| Sunday, December 14th, 2025 |
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Overnight |
Temperature: -19°F |
| Clear with cloudy periods. |
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Morning |
Temperature: -3°F |
| A mix of sun and cloud. Windy at times. |
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Afternoon |
Temperature: 10°F |
| Sunny. Windy. |
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Evening |
Temperature: 15°F |
| Clear. Windy. |
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| Monday, December 15th, 2025 |
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Overnight |
Temperature: 18°F |
| Cloudy. Windy at times. |
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Morning |
Temperature: 23°F |
| A mix of cloud and sun. |
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Afternoon |
Temperature: 18°F |
| A mix of cloud and sun. |
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Evening |
Temperature: 16°F |
| A mix of cloudy and clear skies. |
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| Tuesday, December 16th, 2025 |
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Overnight |
Temperature: 22°F |
| Cloudy. Windy at times. |
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Morning |
Temperature: 32°F |
| Cloudy. Windy at times. |
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Afternoon |
Temperature: 33°F |
| Sunny. |
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Evening |
Temperature: 36°F |
| Cloudy. |
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| Wednesday, December 17th, 2025 |
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Overnight |
Temperature: 27°F |
| Cloudy. |
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Morning |
Temperature: 32°F |
| Cloudy. Windy. |
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Afternoon |
Temperature: 36°F |
| Cloudy. Windy. |
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Evening |
Temperature: 38°F |
| Cloudy. Windy. |
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| Thursday, December 18th, 2025 |
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Overnight |
Temperature: 34°F |
| Clear. Windy. |
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Morning |
Temperature: 37°F |
| Sunny. Wind 20 to 30 mph. |
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Afternoon |
Temperature: 27°F |
| Sunny. Wind 20 to 30 mph. |
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Evening |
Temperature: 21°F |
| Clear. Windy. |
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| Friday, December 19th, 2025 |
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Overnight |
Temperature: 20°F |
| Cloudy. |
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Morning |
Temperature: 30°F |
| Cloudy. Windy. |
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Afternoon |
Temperature: 39°F |
| Cloudy. Windy. |
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Evening |
Temperature: 38°F |
| Cloudy. Windy. |
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| Saturday, December 20th, 2025 |
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Overnight |
Temperature: 33°F |
| Cloudy. Windy at times. |
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Morning |
Temperature: 28°F |
| Cloudy with a chance of flurries. Windy at times. |
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Afternoon |
Temperature: 25°F |
| Sunny. |
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Evening |
Temperature: 23°F |
| Clear. |
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| Sunday, December 21st, 2025 |
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Overnight |
Temperature: 23°F |
| Clear. |
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Morning |
Temperature: 31°F |
| Cloudy. Windy at times. |
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Afternoon |
Temperature: 35°F |
| A mix of cloud and sun. Windy. |
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Evening |
Temperature: 34°F |
| Cloudy. Windy. |
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