National Weather Service forecast

Alton, Illinois Weather

54°Overnight: Slight Chance Light Rain
Wind SW 10 mph
7-DayHourlyRadar

Alton 7-Day Forecast

  1. Overnight
    54°F
    Slight Chance Light Rain
    18% chance of precipitation

    A slight chance of rain before 3am, then a slight chance of drizzle. Mostly cloudy, with a low around 54. Southwest wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.

  2. Wednesday
    62°F
    Slight Chance Drizzle then Mostly Cloudy
    12% chance of precipitation

    A slight chance of drizzle before 7am. Mostly cloudy, with a high near 62. West wind 9 to 14 mph.

  3. Wednesday Night
    45°F
    Partly Cloudy
    1% chance of precipitation

    Partly cloudy, with a low around 45. West wind 5 to 8 mph.

  4. Thursday
    63°F
    Sunny

    Sunny. High near 63, with temperatures falling to around 58 in the afternoon. West wind 7 to 12 mph.

  5. Thursday Night
    46°F
    Mostly Cloudy
    3% chance of precipitation

    Mostly cloudy, with a low around 46. Northwest wind around 6 mph.

  6. Friday
    57°F
    Partly Sunny
    1% chance of precipitation

    Partly sunny. High near 57, with temperatures falling to around 53 in the afternoon.

  7. Friday Night
    36°F
    Partly Cloudy

    Partly cloudy, with a low around 36.

  8. Saturday
    55°F
    Mostly Sunny

    Mostly sunny, with a high near 55.

  9. Saturday Night
    35°F
    Partly Cloudy

    Partly cloudy, with a low around 35.

  10. Sunday
    61°F
    Sunny
    1% chance of precipitation

    Sunny, with a high near 61.

  11. Sunday Night
    36°F
    Clear

    Clear, with a low around 36.

  12. Monday
    65°F
    Sunny

    Sunny, with a high near 65.

  13. Monday Night
    41°F
    Clear

    Clear, with a low around 41.

  14. Tuesday
    68°F
    Sunny
    1% chance of precipitation

    Sunny, with a high near 68.

Issued by the National Weather Service (LSX office), updated .

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About Alton

Population (2020 Census)
25,676
Coordinates
38.904, -90.151
Elevation
505 ft
NWS forecast office
LSX
Time zone
America/Chicago
Sunrise today
6:30 AM CST
Sunset today
4:57 PM CST
Daylight today
10 h 26 min

Alton Weather Questions

What is the weather forecast for Alton, Illinois?

Overnight: A slight chance of rain before 3am, then a slight chance of drizzle. Mostly cloudy, with a low around 54. Southwest wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%. Wednesday: A slight chance of drizzle before 7am. Mostly cloudy, with a high near 62. West wind 9 to 14 mph.

Will it rain or snow in Alton this week?

Not much. The highest chance of precipitation in the 7-day forecast is 18%, Overnight.

How warm and how cold will it get in Alton this week?

The warmest day is Tuesday, with a high near 68°F. The coldest night is Saturday Night, with a low near 35°F.

What time are sunrise and sunset in Alton today?

Sunrise is at 6:30 AM CST and sunset is at 4:57 PM CST, for 10 h 26 min of daylight.

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