Weather forecast for tomorrow
Alton, IL

Weather forecast for tomorrow

Tuesday, May 20.

AM Clouds / PM Sun
5:42 am

8:12 pm
CDT
AM Clouds / PM Sun
79°F / 57°F
  • Wind: 16mph SW
  • Humidity: 73%
  • Precip. probability: 24%
  • Precipitation: 0"
  • UV index: 8
On Tuesday, May 20, morning cloud cover is also expected, but sunny weather will dominate the second half of the day.
Rainfall is not predicted for tomorrow. A temperature range of a warm 78.8°F to a moderate 57.2°F is anticipated.
The temperature is predicted to be slightly warmer than the standard May peak of 74.1°F.
Sunrise will be at 5:42 am and sunset at 8:12 pm; tomorrow's daylight will last for 14h and 31min.

Frequently asked questions

What is the weather forecast for Alton for tomorrow?
On Tuesday, in Alton, a cloudy morning is expected, followed by brighter skies in the afternoon.
Will it rain tomorrow?
No, it will not rain tomorrow.
What will be the highest temperature tomorrow?
Tomorrow, the maximum temperature will be 78.8°F, while the minimum temperature will be 57.2°F.
The maximum temperature will be relatively higher than the average highest temperature of 74.1°F in May. The lowest temperature will be in line with the average low of 56.8°F.
When are sunrise and sunset tomorrow?
On Tuesday, in Alton, sunrise will be at 5:42 am and sunset at 8:12 pm (CDT).
How many hours of daylight will Alton have tomorrow?
Tomorrow in Alton, the daylight will last for 14h and 31min.

Hourly weather forecast

12 am
  • 68°F
  • Feels like:
    68°F
Thunderstorms
Thunderstorms
  • Wind: 12mph SSE
  • Pressure: 29.65"Hg
  • Humidity: 92%
  • Precip. probability: 100%
  • Precipitation: 0.12"
  • Visibility: 4mi
2 am
  • 68°F
  • Feels like:
    70°F
Thunderstorms
Thunderstorms
  • Wind: 9mph SSE
  • Pressure: 29.62"Hg
  • Humidity: 100%
  • Precip. probability: 68%
  • Precipitation: 0.24"
  • Visibility: 5mi
4 am
  • 68°F
  • Feels like:
    70°F
Scattered Thunderstorms
Scattered Thunderstorms
  • Wind: 11mph SSE
  • Pressure: 29.56"Hg
  • Humidity: 96%
  • Precip. probability: 49%
  • Precipitation: 0.12"
  • Visibility: 5mi
Sunrise: 5:42 am
6 am
  • 66°F
  • Feels like:
    68°F
Scattered Thunderstorms
Scattered Thunderstorms
  • Wind: 9mph SSE
  • Pressure: 29.56"Hg
  • Humidity: 98%
  • Precip. probability: 59%
  • Precipitation: 0.04"
  • Visibility: 6mi
8 am
  • 70°F
  • Feels like:
    72°F
Mostly Cloudy
Mostly Cloudy
  • Wind: 11mph S
  • Pressure: 29.56"Hg
  • Humidity: 91%
  • Precip. probability: 11%
  • Precipitation: 0"
  • Visibility: 10mi
10 am
  • 72°F
  • Feels like:
    73°F
Isolated Thunderstorms
Isolated Thunderstorms
  • Wind: 12mph SSW
  • Pressure: 29.56"Hg
  • Humidity: 79%
  • Precip. probability: 31%
  • Precipitation: 0.04"
  • Visibility: 9mi
12 pm
  • 75°F
  • Feels like:
    75°F
Mostly Cloudy
Mostly Cloudy
  • Wind: 12mph SW
  • Pressure: 29.53"Hg
  • Humidity: 72%
  • Precip. probability: 20%
  • Precipitation: 0"
  • Visibility: 10mi
2 pm
  • 77°F
  • Feels like:
    79°F
Partly Cloudy
Partly Cloudy
  • Wind: 14mph SW
  • Pressure: 29.53"Hg
  • Humidity: 66%
  • Precip. probability: 23%
  • Precipitation: 0"
  • Visibility: 10mi
4 pm
  • 77°F
  • Feels like:
    79°F
Partly Cloudy
Partly Cloudy
  • Wind: 14mph WSW
  • Pressure: 29.53"Hg
  • Humidity: 64%
  • Precip. probability: 18%
  • Precipitation: 0"
  • Visibility: 10mi
6 pm
  • 77°F
  • Feels like:
    77°F
Partly Cloudy
Partly Cloudy
  • Wind: 16mph W
  • Pressure: 29.53"Hg
  • Humidity: 58%
  • Precip. probability: 4%
  • Precipitation: 0"
  • Visibility: 10mi
8 pm
  • 70°F
  • Feels like:
    70°F
Partly Cloudy
Partly Cloudy
  • Wind: 14mph W
  • Pressure: 29.59"Hg
  • Humidity: 67%
  • Precip. probability: 10%
  • Precipitation: 0"
  • Visibility: 10mi
Sunset: 8:12 pm
10 pm
  • 66°F
  • Feels like:
    66°F
Mostly Clear
Mostly Clear
  • Wind: 12mph W
  • Pressure: 29.65"Hg
  • Humidity: 68%
  • Precip. probability: 2%
  • Precipitation: 0"
  • Visibility: 10mi
Tomorrow, on Tuesday, a combination of cloudy and unstable weather is anticipated.
Rainfall is anticipated from 12 am to 6 am and at 10 am. With moderate precipitation of 0.24", most rainfall is expected at 2 am.
The temperature will be between a minimum of 64.4°F and a maximum of 77°F. The warmest part of the day will be at 2 pm, and from 4 pm to 6 pm.
The forecasted high will be moderately higher than the typical May maximum of 74.1°F. The lowest temperature is also close to May's typical minimum of 56.8°F.
Updated: May 19, 2025 @ 22:58:40 UTC
Published by: Weather Atlas | About Us
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