Allen, IL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms then Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Allen, IL in one place.
A chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 91. Heat index values as high as 101. South southeast wind 7 to 12 mph, with gusts as high as 21 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
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: Jun 27, 2026 1:27 AM CDT.
The active forecast window currently covers Jun 28 to Jul 3, 2026 for Allen, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 28 to Jul 3, 2026
- Latest sync
- Jun 27, 2026 1:27 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Allen
Thursday looks like the warmest upcoming period in Allen at 96 degrees F.
Thursday Night is the coolest period ahead with temperatures near 74 degrees F.
The strongest winds are forecast for Sunday at about 7 to 12 mph SSE.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 27, 2026 1:27 AM CDT
- Coverage
- 6 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
Mostly clear, with a low around 75. South wind 7 to 10 mph, with gusts as high as 20 mph.
Sunny, with a high near 94. South wind 8 to 12 mph, with gusts as high as 21 mph.
Mostly clear, with a low around 76. South wind 6 to 12 mph, with gusts as high as 20 mph.
Sunny, with a high near 94.
Clear, with a low around 75.
Sunny, with a high near 94.
Mostly clear, with a low around 75.
Sunny, with a high near 96.
Mostly clear, with a low around 74.
A chance of showers and thunderstorms after 7am. Sunny, with a high near 94.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
Jun 28
|
Chance Showers And Thunderstorms then Mostly Sunny
|
91°F |
7 to 12 mph
SSE
|
|
Sunday Night
Jun 28
|
Mostly Clear
|
75°F |
7 to 10 mph
S
|
|
Monday
Jun 29
|
Sunny
|
94°F |
8 to 12 mph
S
|
|
Monday Night
Jun 29
|
Mostly Clear
|
76°F |
6 to 12 mph
S
|
|
Tuesday
Jun 30
|
Sunny
|
94°F |
6 to 10 mph
SSW
|
|
Tuesday Night
Jun 30
|
Clear
|
75°F |
5 to 10 mph
SSW
|
|
Wednesday
Jul 1
|
Sunny
|
94°F |
5 to 8 mph
SSW
|
|
Wednesday Night
Jul 1
|
Mostly Clear
|
75°F |
3 to 7 mph
S
|
|
Thursday
Jul 2
|
Sunny
|
96°F |
3 to 8 mph
SSW
|
|
Thursday Night
Jul 2
|
Mostly Clear
|
74°F |
2 to 6 mph
SSW
|
|
Friday
Jul 3
|
Chance Showers And Thunderstorms
|
94°F |
3 to 7 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Allen.