ALTON, IL 62002 Weather Forecast & Current Conditions
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  62002 WEATHER WARNINGS (SEVERE T-STORM & TORNADO)
 CURRENT WEATHER

ALTON, IL
Current Weather
7:50 PM CDT JUN 9, 2026
Clear
86°F
Feels Like: 95°F
Dewpoint: 75°F
Rel. Hum.: 70%
Visibility: 10 miles
Wind: SW at 8 mph
Pressure: 29.89 inches
Last 72 hours

Local Area Snow Depth

Illinois Current Weather

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(Automated weather data from NWS/FAA)
  62002 WEATHER FORECAST
10-Day model forecast maps
2025 Hurricanes

ALTON, IL 62002
Weather Forecast

 Snowfall Forecast pages
Snow Depth pages
TONIGHT
Partly cloudy this evening, then becoming clear. Lows in the mid 70s. Southwest winds 5 to 10 mph. Heat index values up to 102 early this evening.
WEDNESDAY
Sunny. Highs in the mid 90s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Heat index values up to 103.
WEDNESDAY NIGHT
Mostly clear. Lows in the mid 70s. South winds 10 to 15 mph. Heat index values up to 103 early in the evening.
THURSDAY
Sunny. A slight chance of showers and thunderstorms in the afternoon. Humid with highs in the lower 90s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 20 percent. Heat index values up to 105.
THURSDAY NIGHT
Showers with a chance of thunderstorms in the evening, then mostly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. Southwest winds 15 to 20 mph, becoming northwest 5 to 10 mph after midnight. Chance of rain 80 percent. Heat index values up to 102 early in the evening.
FRIDAY AND FRIDAY NIGHT
Mostly clear. Highs in the mid 80s. Lows in the mid 60s.
SATURDAY
Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent.
SATURDAY NIGHT
Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly cloudy with showers likely with a slight chance of thunderstorms after midnight. Lows in the upper 60s. Chance of rain 70 percent.
SUNDAY
Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 50 percent.
SUNDAY NIGHT
Mostly cloudy. A chance of showers, mainly in the evening. Lows in the lower 60s. Chance of rain 50 percent.
MONDAY
Partly sunny with a slight chance of showers and thunderstorms. Highs around 80. Chance of rain 20 percent.
MONDAY NIGHT
Partly cloudy in the evening, then clearing. A slight chance of thunderstorms in the evening. A slight chance of showers. Lows around 60. Chance of rain 20 percent.
TUESDAY
Mostly sunny. A slight chance of showers in the morning. Highs around 80. Chance of rain 20 percent.

  62002 WEATHER SATELLITE LOOPS
Visible Weather Satellite
ALTON, IL 62002
Infrared Weather Satellite
ALTON, IL 62002
  62002 WEATHER RADAR LOOP
NEXRAD Weather Radar
ALTON, IL 62002
 MOS COMPUTER WEATHER FORECAST

ALTON, IL 3 hourly weather forecast
weather forecast created  6:00 AM MDT  6/ 9/2026
Tuesday
9 JUN 2026		 ALTON, IL 62002 weather forecast Day 1, 12 hours 1 PM 85° 93° Mostly Cloudy 18%
RAIN
.1–.25 in		 0% Thunder
( 44% severe)		 SW   9 72% 75°
High 90° ALTON, IL 62002 weather forecast Day 1, 15 hours 4 PM 89° 99° Partly Cloudy WSW   9 64% 75°
Partly Cloudy



 ALTON, IL 62002 weather forecast Day 1, 18 hours 7 PM 88° 100° Partly Cloudy 8%

 0% Thunder
( 24% severe)		 SW   7 70% 77°
ALTON, IL 62002 weather forecast Day 1, 21 hours 10 PM 80° 85° Partly Cloudy SSW   6 82% 74°
Wednesday
10 JUN 2026		 ALTON, IL 62002 weather forecast Day 2, 0 hours 1 AM 78° 80° Clear 2%

 0% Thunder
( 9% severe)		 SSW   6 82% 72°
Low 73° ALTON, IL 62002 weather forecast Day 2, 3 hours 4 AM 76° 77° Clear SSW   7 82% 70°
High 92° ALTON, IL 62002 weather forecast Day 2, 6 hours 7 AM 76° 77° Clear 3%

 0% Thunder
( 10% severe)		 S   8 85% 71°

Partly Cloudy



 ALTON, IL 62002 weather forecast Day 2, 9 hours 10 AM 84° 90° Clear SSW   13 67% 72°
ALTON, IL 62002 weather forecast Day 2, 12 hours 1 PM 90° 98° Partly Cloudy 9%

 0% Thunder
( 33% severe)		 SSW   14 56% 72°
ALTON, IL 62002 weather forecast Day 2, 15 hours 4 PM 92° 100° Partly Cloudy SSW   15 52% 72°
ALTON, IL 62002 weather forecast Day 2, 18 hours 7 PM 89° 97° Partly Cloudy 6%

 0% Thunder
( 29% severe)		 S   14 59% 73°
ALTON, IL 62002 weather forecast Day 2, 21 hours 10 PM 82° 86° Partly Cloudy SSW   10 69% 71°
Thursday
11 JUN 2026		 ALTON, IL 62002 weather forecast Day 3, 0 hours 1 AM 79° 82° Partly Cloudy 3%

 0% Thunder
( 11% severe)		 SSW   9 74% 70°
Low 75° ALTON, IL 62002 weather forecast Day 3, 3 hours 4 AM 77° 79° Clear SSW   9 76% 69°
High 93° ALTON, IL 62002 weather forecast Day 3, 6 hours 7 AM 77° 79° Partly Cloudy 3%

 0% Thunder
( 12% severe)		 SSW   9 79% 70°

Partly Cloudy

Chance of Rain

 ALTON, IL 62002 weather forecast Day 3, 9 hours 10 AM 85° 91° Partly Cloudy SSW   14 65% 72°
ALTON, IL 62002 weather forecast Day 3, 15 hours 1 PM 90° 99° Partly Cloudy 21%
RAIN
.25–.5 in		 0% Thunder
( 28% severe)		 S   16 58% 73°
ALTON, IL 62002 weather forecast Day 3, 18 hours 4 PM 92° 100° Partly Cloudy SSW   18 52% 72°
ALTON, IL 62002 weather forecast Day 3, 21 hours 7 PM 86° 93° Partly Cloudy     SSW   16 65% 73°

ALTON, IL extended weather forecast
Friday
12 JUN 2026		 Saturday
13 JUN 2026		 Sunday
14 JUN 2026		 Monday
15 JUN 2026		 Tuesday
16 JUN 2026
Low 65° Low 59° Low 65° Low 62° Low 56°
High 82° High 84° High 78° High 76° High 75°
ALTON, IL 62002 weather forecast Day 4 ALTON, IL 62002 weather forecast Day 5 ALTON, IL 62002 weather forecast Day 6 ALTON, IL 62002 weather forecast Day 7 <!--SEARCHED_TOWN_NAME--> weather forecast Day 8
Partly Cloudy
62% Rain		 Partly Cloudy
16% Rain		 Overcast
61% Rain		 Overcast
45% Rain		 Overcast
50% Rain
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