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 Alton Weather Forecast Summary |
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Today
Jul 15th
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Thursday
Jul 16th
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Friday
Jul 17th
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Saturday
Jul 18th
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Sunday
Jul 19th
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Sunny |
Sunny |
Sunny |
Sunny |
Mostly Sunny |
90°F
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92°F
68°F |
99°F
71°F |
90°F
71°F |
98°F
66°F |
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| Alton Detailed Weather Forecast |
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| Wednesday, July 15th, 2026 |
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Morning |
Temperature: 74°F |
| Sunny. |
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Afternoon |
Temperature: 88°F |
| Sunny. Slight chance of a thunderstorm. |
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Evening |
Temperature: 81°F |
| Clear. Chance of a thunderstorm. Windy at times. |
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| Thursday, July 16th, 2026 |
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Overnight |
Temperature: 71°F |
| Clear. Slight chance of a thunderstorm. |
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Morning |
Temperature: 74°F |
| Sunny. |
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Afternoon |
Temperature: 90°F |
| Sunny. |
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Evening |
Temperature: 85°F |
| Clear. Chance of a thunderstorm. Windy at times. |
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| Friday, July 17th, 2026 |
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Overnight |
Temperature: 74°F |
| Clear. Windy at times. |
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Morning |
Temperature: 78°F |
| Sunny. Windy at times. |
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Afternoon |
Temperature: 97°F |
| Sunny. Slight chance of a thunderstorm. Windy at times. |
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Evening |
Temperature: 89°F |
| Clear. Chance of a thunderstorm. Windy at times. |
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| Saturday, July 18th, 2026 |
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Overnight |
Temperature: 75°F |
| Clear. |
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Morning |
Temperature: 75°F |
| Sunny. Slight chance of a thunderstorm. Windy at times. |
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Afternoon |
Temperature: 88°F |
| Sunny. Slight chance of a thunderstorm. Windy at times. |
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Evening |
Temperature: 79°F |
| Clear. Slight chance of a thunderstorm. |
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| Sunday, July 19th, 2026 |
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Overnight |
Temperature: 67°F |
| Clear. |
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Morning |
Temperature: 74°F |
| Mostly sunny. Windy at times. |
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Afternoon |
Temperature: 95°F |
| Mostly sunny. Windy at times. |
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Evening |
Temperature: 85°F |
| Clear with cloudy periods with a chance of showers. Slight chance of a thunderstorm. Windy. |
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| Monday, July 20th, 2026 |
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Overnight |
Temperature: 74°F |
| A mix of cloudy and clear skies with a chance of showers. Slight chance of a thunderstorm. Windy at times. |
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Morning |
Temperature: 77°F |
| A mix of sun and cloud. Slight chance of a thunderstorm. Windy at times. |
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Afternoon |
Temperature: 89°F |
| Sunny. Windy. |
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Evening |
Temperature: 75°F |
| Clear. Windy at times. |
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| Tuesday, July 21st, 2026 |
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Overnight |
Temperature: 55°F |
| Clear. |
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Morning |
Temperature: 60°F |
| Sunny with cloudy periods. |
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Afternoon |
Temperature: 77°F |
| Sunny with cloudy periods. |
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Evening |
Temperature: 71°F |
| Mostly clear. |
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| Wednesday, July 22nd, 2026 |
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Overnight |
Temperature: 64°F |
| Cloudy with clear periods. |
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Morning |
Temperature: 64°F |
| Cloudy with sunny periods. Windy at times. |
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Afternoon |
Temperature: 74°F |
| A mix of cloud and sun. Windy. |
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Evening |
Temperature: 66°F |
| Clear. Windy at times. |
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| Thursday, July 23rd, 2026 |
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Overnight |
Temperature: 61°F |
| Clear with a slight chance of showers. |
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Morning |
Temperature: 67°F |
| Sunny. |
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Afternoon |
Temperature: 90°F |
| Sunny. |
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Evening |
Temperature: 81°F |
| A mix of cloudy and clear skies. |
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