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Alton, IL 62002 Weather

Today: Mostly Sunny then Isolated Rain Showers, high 80°F, low 54°F. Hourly and 10-day forecast from the National Weather Service. Times are local (CDT).

Alton, IL 62002 current weather

61°F

Mostly Clear

Forecast for this hour. No recent report from a nearby station.

H 80° / L 54°

No recent station report. NWS hourly forecast updated 10/28/2026, 11:26 PM PT

Hourly forecast

NWS, updated 10/28/2026, 11:26 PM PT

  1. Now61°
  2. 3 AM59°
  3. 4 AM58°
  4. 5 AM57°
  5. 6 AM55°
  6. 7 AM54°
  7. 8 AM55°
  8. 9 AM62°
  9. 10 AM68°
  10. 11 AM71°
  11. 12 PM75°
  12. 1 PM77°
  13. 2 PM79°11%
  14. 3 PM80°14%
  15. 4 PM79°17%
  16. 5 PM78°19%
  17. 6 PM74°18%
  18. 7 PM69°16%
  19. 8 PM65°13%
  20. 9 PM63°10%
  21. 10 PM62°10%
  22. 11 PM60°10%
  23. 12 AM61°10%Fri
  24. 1 AM60°10%
  25. 2 AM58°13%
  26. 3 AM58°15%
  27. 4 AM57°13%
  28. 5 AM56°11%
  29. 6 AM56°10%
  30. 7 AM56°
  31. 8 AM55°
  32. 9 AM60°
  33. 10 AM65°
  34. 11 AM69°
  35. 12 PM72°
  36. 1 PM75°
  37. 2 PM76°
  38. 3 PM77°
  39. 4 PM78°
  40. 5 PM76°
  41. 6 PM74°
  42. 7 PM70°
  43. 8 PM65°
  44. 9 PM63°
  45. 10 PM63°
  46. 11 PM62°
  47. 12 AM62°Sat
  48. 1 AM61°

10-day forecast

Tap a day for details

  • Today10/2919% chance of precipitationLow 54°High 80°

    Thursday: Isolated rain showers after 4pm. Mostly sunny, with a high near 80. Southwest wind 5 to 8 mph. Chance of precipitation is 20%.

    Overnight: Mostly clear, with a low around 54. South wind around 6 mph.

    Mostly Sunny then Isolated Rain Showers
  • Fri10/3010% chance of precipitationLow 56°High 78°

    Friday: Mostly sunny, with a high near 78. East wind 6 to 9 mph.

    Friday Night: Mostly cloudy, with a low around 56. Southeast wind around 6 mph.

    Mostly Sunny
  • Sat10/3136% chance of precipitationLow 53°High 74°

    Saturday: Cloudy, with a high near 74.

    Saturday Night: A chance of rain showers after 7pm. Mostly cloudy, with a low around 53. Chance of precipitation is 40%.

    Cloudy
  • Sun11/126% chance of precipitationLow 54°High 74°

    Sunday: A chance of rain showers before noon. Partly sunny, with a high near 74. Chance of precipitation is 30%.

    Sunday Night: A slight chance of rain showers after midnight. Mostly cloudy, with a low around 54. Chance of precipitation is 20%.

    Chance Rain Showers then Partly Sunny
  • Mon11/253% chance of precipitationLow 57°High 71°

    Monday: A chance of rain showers. Mostly cloudy, with a high near 71. Chance of precipitation is 40%.

    Monday Night: A chance of rain showers. Mostly cloudy, with a low around 57. Chance of precipitation is 50%.

    Chance Rain Showers
  • Tue11/363% chance of precipitationLow 53°High 71°

    Tuesday: Rain showers likely. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.

    Tuesday Night: A chance of rain showers. Mostly cloudy, with a low around 53. Chance of precipitation is 50%.

    Rain Showers Likely
  • Wed11/449% chance of precipitationLow High 69°

    Wednesday: A chance of rain showers before noon, then a chance of showers and thunderstorms. Partly sunny, with a high near 69. Chance of precipitation is 50%.

    Chance Rain Showers
  • Thu11/5Model blend28% chance of precipitationLow 43°High 65°

    Thursday: Partly cloudy, slight chance of rain. High near 65°. Low that night near 43°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

  • Fri11/6Model blend15% chance of precipitationLow 40°High 61°

    Friday: Partly cloudy, slight chance of rain. High near 61°. Low that night near 40°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

  • Sat11/7Model blend10% chance of precipitationLow 41°High 63°

    Saturday: Partly cloudy. High near 63°. Low that night near 41°. About 0.01 in of precipitation.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

Forecast for 38.940, -90.147 from the NWS LSX office, updated 10/28/2026, 11:26 PM PT · Official forecast on weather.gov

Days 8 to 10: NOAA National Blend of Models, station KALN (Alton/St Louis Rgnl, 7 mi), model run 10/28/2026, 9:00 PM CDT

From the National Weather Service; may be delayed. Not for life-safety decisions. In an emergency, call 911.

Next 6 hours

NWS hourly forecast

  1. Now61°Mostly Clear0%5 mph
  2. 3 AM59°Mostly Clear0%6 mph
  3. 4 AM58°Mostly Clear0%6 mph
  4. 5 AM57°Mostly Clear1%5 mph
  5. 6 AM55°Sunny1%6 mph
  6. 7 AM54°Sunny0%6 mph

Hourly details

Next 7 days: temperature chart, feels like, rain and snow amounts, sky cover, wind and gustsShow

Radar and satellite

National radar

NEXRAD (up to 24 hours) and GOES

Latest

Frequently asked questions

What is the high temperature today in Alton, IL 62002?
The National Weather Service forecast for thursday calls for a high near 80°F. Mostly Sunny then Isolated Rain Showers.
Will it rain in Alton, IL 62002 in the next 24 hours?
The NWS hourly forecast does not show any hour with a 50% or higher chance of precipitation in the next 24 hours.
What is the 10-day forecast for Alton, IL 62002?
The first 7 days come from the National Weather Service forecast. Days 8 to 10 (Nov 5 to Nov 7) come from the NOAA National Blend of Models, with highs of 61°F to 65°F. Model guidance this far out often changes.
What time is sunrise and sunset in Alton, IL 62002 today?
Sunrise is about 7:24 AM CDT and sunset is about 6:03 PM CDT (calculated for the center of the area, within a few minutes).
What is the normal October weather in Alton, IL 62002?
At Alton - Melvin Price L&d, the 1991 to 2020 normal high in October is 68°F and the normal low is 48°F.

Nearby hazards

Illinois hazards

Severe storm and flash flood outlooks, expected rain, river flooding and wildfires near this area

  • Severe storm outlook today:General thunderstormsOutlook map
  • Excessive rainfall outlook (flash flood risk):Could not check the Weather Prediction Center outlook right now.
  • River gauges within 40 miles at or above flood stage: None reported
  • Active wildfires within 50 miles: None reported

UV and air quality forecast

EPA and AirNow

AQI forecast today (St. Louis (Metro-east))
ModeratePM2.5
AQI forecast tomorrow (St. Louis (Metro-east))
GoodPM2.5

UV index guide · Air quality

Drought

By county

Madison County, week of 10/20/2026

64% of the county is in moderate drought or worse.

Sun and moon

Local time, center of the area

Sunrise
7:24 AM
Sunset
6:03 PM
Daylight
10 hr 39 min
Moon
Waning Gibbous 89% lit
First light (civil dawn)
6:57 AM
Last light (civil dusk)
6:31 PM
Moonrise
8:35 PM
Moonset
11:36 AM

Normal October weather

Climate

Normal October high 68°, low 48°, precipitation 2.93 in for the month. 1991 to 2020 normals at Alton - Melvin Price L&d, 5 mi away.

Other places nearby

Data sources

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About this data

Weather and emergencies: Weather, air quality and hazard information on this page is delayed and may be incomplete. It is not a substitute for official warnings. Always follow the National Weather Service, local emergency management and public safety officials. In an emergency, call 911. For evacuation orders, use your local official alert system.

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