Allen, IL Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Allen, IL in one place.
Mostly sunny, with a high near 83. South wind 8 to 17 mph, with gusts as high as 30 mph.
Local Weather Overview
This forecast page for Allen, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Apr 21, 2026 9:55 AM CDT.
The active forecast window currently covers Apr 23 to Apr 27, 2026 for Allen, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 23 to Apr 27, 2026
- Latest sync
- Apr 21, 2026 9:55 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Allen
Thursday looks like the warmest upcoming period in Allen at 83 degrees F.
Saturday Night is the coolest period ahead with temperatures near 48 degrees F.
The strongest winds are forecast for Thursday at about 8 to 17 mph S.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 21, 2026 9:55 AM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KILX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of showers and thunderstorms between 7pm and 1am, then showers and thunderstorms likely. Mostly cloudy, with a low around 61. South wind 13 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
Showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 74. Southwest wind 9 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
A chance of showers and thunderstorms. Partly cloudy, with a low around 52. Chance of precipitation is 50%.
A slight chance of rain showers before 7am. Mostly sunny, with a high near 71.
Partly cloudy, with a low around 48.
A slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 72.
A slight chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 54.
A chance of showers and thunderstorms. Mostly cloudy, with a high near 71.
A chance of showers and thunderstorms before 1am, then a slight chance of showers and thunderstorms. Mostly cloudy, with a low around 51.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Apr 23
|
Mostly Sunny
|
83°F |
8 to 17 mph
S
|
|
Thursday Night
Apr 23
|
Slight Chance Showers And Thunderstorms
|
61°F |
13 to 16 mph
S
|
|
Friday
Apr 24
|
Showers And Thunderstorms Likely
|
74°F |
9 to 13 mph
SW
|
|
Friday Night
Apr 24
|
Chance Showers And Thunderstorms
|
52°F |
9 mph
NNW
|
|
Saturday
Apr 25
|
Slight Chance Rain Showers then Mostly Sunny
|
71°F |
9 mph
NNE
|
|
Saturday Night
Apr 25
|
Partly Cloudy
|
48°F |
8 mph
NE
|
|
Sunday
Apr 26
|
Partly Sunny then Slight Chance Showers And Thunderstorms
|
72°F |
10 mph
E
|
|
Sunday Night
Apr 26
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
54°F |
10 mph
E
|
|
Monday
Apr 27
|
Chance Showers And Thunderstorms
|
71°F |
13 mph
SE
|
|
Monday Night
Apr 27
|
Chance Showers And Thunderstorms
|
51°F |
12 mph
SSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Allen.