NimbocastAlton, IL Weather
Live radar, hourly and 7-day forecast, and National Weather Service alerts for Alton, Madison County, Illinois.
Updated Jul 29, 2026, 2:17 PM local time · Radar refreshes every 5 minutes
☀️
Alton
86°F
Wind 7 mph
Humidity 45%
Cloud cover 0%
UV index 8
Alerts 0
Active alerts
✓
No active National Weather Service alerts for Alton, IL.
Alton weather radar
Light
Heavy
Next 24 hours
Now
☀️
85°F
3 PM
☀️
87°F
4 PM
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87°F
5 PM
☀️
87°F
6 PM
☀️
87°F
7 PM
☀️
85°F
8 PM
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81°F
9 PM
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78°F
10 PM
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76°F
11 PM
☀️
75°F
12 AM
☀️
73°F
1 AM
☀️
72°F
2 AM
☀️
70°F
3 AM
☀️
69°F
4 AM
☀️
68°F
5 AM
☀️
67°F
6 AM
☀️
66°F
7 AM
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67°F
8 AM
☀️
71°F
9 AM
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75°F
10 AM
☀️
79°F
11 AM
☀️
83°F
12 PM
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85°F
1 PM
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87°F
7-day forecast
Today
Jul 29
⛅
87°F
68°F
Thu
Jul 30
☁️
90°F
66°F
Fri
Jul 31
🌧️
83°F
69°F
70%
Sat
Aug 1
🌦️
73°F
66°F
70%
Sun
Aug 2
☁️
80°F
65°F
15%
Mon
Aug 3
☀️
81°F
61°F
15%
Tue
Aug 4
⛅
85°F
63°F
13%
Weather near Alton
2 mi
Upper Alton, IL4 mi
Godfrey, IL7 mi
Spanish Lake, MO7 mi
Old Jamestown, MO10 mi
Florissant, MO12 mi
Ferguson, MO13 mi
Granite City, IL13 mi
Hazelwood, MO
Alerts are relayed from the National Weather Service and may lag
the official source. In a life-threatening situation always follow
weather.gov and local emergency
broadcasts.