BRIGHTON, IL 62012 Weather Forecast & Current Conditions
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  62012 WEATHER WARNINGS (SEVERE T-STORM & TORNADO)
 CURRENT WEATHER

ALTON, IL
Current Weather
11:15 PM CDT JUN 8, 2026
Overcast
77°F
Feels Like: 78°F
Dewpoint: 75°F
Rel. Hum.: 94%
Visibility: 10 miles
Wind: Calm
Pressure: 29.98 inches
Last 72 hours

Local Area Snow Depth

Illinois Current Weather

Illinois MOS Forecast Weather


Weather Map

(Automated weather data from NWS/FAA)
  62012 WEATHER FORECAST
10-Day model forecast maps
2025 Hurricanes

BRIGHTON, IL 62012
Weather Forecast

 Snowfall Forecast pages
Snow Depth pages
TONIGHT
Mostly cloudy. Showers and thunderstorms likely, mainly this evening. Some thunderstorms may produce heavy rainfall. Lows in the upper 60s. South winds 5 to 10 mph, becoming southwest after midnight. Chance of rain 60 percent.
TUESDAY
Mostly sunny. A chance of showers with a slight chance of thunderstorms in the morning, then a slight chance of showers and thunderstorms in the afternoon. Some thunderstorms may produce heavy rainfall in the morning. Humid with highs in the upper 80s. Southwest winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 103 in the afternoon.
TUESDAY NIGHT
Mostly clear. Humid with lows in the lower 70s. Southwest winds 5 to 10 mph. Heat index values up to 103 early in the evening.
WEDNESDAY
Sunny. Highs in the lower 90s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Heat index values up to 101.
WEDNESDAY NIGHT
Partly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Lows in the lower 70s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 50 percent.
THURSDAY
Mostly sunny. A chance of showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 60 percent. Heat index values up to 100.
THURSDAY NIGHT
Showers likely with a chance of thunderstorms in the evening, then mostly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the mid 60s. Chance of rain 70 percent.
FRIDAY
Sunny. Highs in the mid 80s.
FRIDAY NIGHT
Mostly clear. A slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20 percent.
SATURDAY
Mostly sunny with a slight chance of showers and thunderstorms. Highs in the mid 80s. Chance of rain 20 percent.
SATURDAY NIGHT
Partly cloudy with a chance of showers and thunderstorms. Lows in the lower 60s. Chance of rain 50 percent.
SUNDAY
Mostly sunny with a chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 40 percent.
SUNDAY NIGHT
Partly cloudy with a 30 percent chance of showers. Lows around 60.

  62012 WEATHER SATELLITE LOOPS
Visible Weather Satellite
BRIGHTON, IL 62012
Infrared Weather Satellite
BRIGHTON, IL 62012
  62012 WEATHER RADAR LOOP
NEXRAD Weather Radar
BRIGHTON, IL 62012
 MOS COMPUTER WEATHER FORECAST

ALTON, IL 3 hourly weather forecast
weather forecast created  6:00 PM MDT  6/ 8/2026
Tuesday
9 JUN 2026		 BRIGHTON, IL 62012 weather forecast Day 1, 0 hours 1 AM 74° 74° Mostly Cloudy 59%
RAIN
***		 0% Thunder
( 23% severe)		 SSW   5 90% 71°
Low 72° BRIGHTON, IL 62012 weather forecast Day 1, 3 hours 4 AM 73° 73° Mostly Cloudy SSW   5 90% 70°
High 91° BRIGHTON, IL 62012 weather forecast Day 1, 6 hours 7 AM 74° 74° Mostly Cloudy 20%
RAIN
.01–.1 in		 0% Thunder
( 30% severe)		 S   5 93% 72°

Mostly Cloudy

Chance of Rain

 BRIGHTON, IL 62012 weather forecast Day 1, 9 hours 10 AM 81° 86° Mostly Cloudy SW   10 77% 73°
BRIGHTON, IL 62012 weather forecast Day 1, 12 hours 1 PM 87° 98° Mostly Cloudy 23%
RAIN
<.01 in		 0% Thunder
( 41% severe)		 SW   10 70% 76°
BRIGHTON, IL 62012 weather forecast Day 1, 15 hours 4 PM 90° 102° Partly Cloudy SW   12 64% 76°
BRIGHTON, IL 62012 weather forecast Day 1, 18 hours 7 PM 89° 102° Partly Cloudy 6%

 0% Thunder
( 19% severe)		 SSW   8 68% 77°
BRIGHTON, IL 62012 weather forecast Day 1, 21 hours 10 PM 81° 87° Partly Cloudy S   6 82% 75°
Wednesday
10 JUN 2026		 BRIGHTON, IL 62012 weather forecast Day 2, 0 hours 1 AM 79° 82° Clear 2%

 0% Thunder
( 7% severe)		 SSW   7 79% 72°
Low 73° BRIGHTON, IL 62012 weather forecast Day 2, 3 hours 4 AM 76° 77° Clear SSW   7 82% 70°
High 92° BRIGHTON, IL 62012 weather forecast Day 2, 6 hours 7 AM 77° 79° Clear 0%

 0% Thunder
( 9% severe)		 SSW   8 82% 71°

Clear



 BRIGHTON, IL 62012 weather forecast Day 2, 9 hours 10 AM 84° 90° Clear SSW   13 67% 72°
BRIGHTON, IL 62012 weather forecast Day 2, 12 hours 1 PM 90° 99° Clear 4%

 0% Thunder
( 37% severe)		 SSW   14 58% 73°
BRIGHTON, IL 62012 weather forecast Day 2, 15 hours 4 PM 92° 99° Partly Cloudy SSW   16 51% 71°
BRIGHTON, IL 62012 weather forecast Day 2, 18 hours 7 PM 90° 99° Clear 15%
RAIN
<.01 in		 0% Thunder
( 26% severe)		 S   15 58% 73°
BRIGHTON, IL 62012 weather forecast Day 2, 21 hours 10 PM 82° 86° Partly Cloudy SSW   12 67% 70°

ALTON, IL extended weather forecast
BAD DAY
BAD DATE		 BAD DAY
BAD DATE		 BAD DAY
BAD DATE		 BAD DAY
BAD DATE		 BAD DAY
BAD DATE
Low 72° Low 73° Low 71° Low 57° Low 59°
High 94° High 92° High 81° High 84° High 81°
BRIGHTON, IL 62012 weather forecast Day 3 BRIGHTON, IL 62012 weather forecast Day 4 BRIGHTON, IL 62012 weather forecast Day 5 BRIGHTON, IL 62012 weather forecast Day 6 BRIGHTON, IL 62012 weather forecast Day 7
Partly Cloudy
20% Rain		 Partly Cloudy
40% Rain		 Overcast
54% Rain		 Partly Cloudy
14% Rain		 Partly Cloudy
17% Rain
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