Frederick, IL Weather Forecast
Local 7-day forecast
Partly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Frederick, IL in one place.
Partly sunny, with a high near 91. Heat index values as high as 102. West southwest wind 2 to 9 mph.
Local Weather Overview
This forecast page for Frederick, 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 8, 2026 11:21 PM CDT.
The active forecast window currently covers Jun 9 to Jun 15, 2026 for Frederick, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 9 to Jun 15, 2026
- Latest sync
- Jun 8, 2026 11:21 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Frederick
Tuesday looks like the warmest upcoming period in Frederick at 91 degrees F.
Sunday Night is the coolest period ahead with temperatures near 61 degrees F.
The strongest winds are forecast for Wednesday at about 7 to 18 mph SSW.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 8, 2026 11:21 PM CDT
- Coverage
- 7 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 72. Heat index values as high as 102. South southwest wind 5 to 8 mph, with gusts as high as 16 mph.
Sunny, with a high near 91. South southwest wind 7 to 18 mph, with gusts as high as 26 mph.
Showers and thunderstorms likely after 7pm. Partly cloudy, with a low around 70. South southwest wind 8 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
Rain showers likely before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers and thunderstorms likely. Mostly sunny, with a high near 91. South southwest wind 8 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Showers and thunderstorms likely before 7pm, then showers and thunderstorms likely between 7pm and 1am. Mostly cloudy, with a low around 63. West wind 3 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Mostly sunny, with a high near 85.
A slight chance of rain showers after 1am. Clear, with a low around 63.
A slight chance of rain showers before 7am, then a slight chance of showers and thunderstorms. Sunny, with a high near 88.
A chance of showers and thunderstorms. Partly cloudy, with a low around 63.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 83.
A chance of showers and thunderstorms. Partly cloudy, with a low around 61.
A chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 80.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Jun 9
|
Partly Sunny
|
91°F |
2 to 9 mph
WSW
|
|
Tuesday Night
Jun 9
|
Mostly Clear
|
72°F |
5 to 8 mph
SSW
|
|
Wednesday
Jun 10
|
Sunny
|
91°F |
7 to 18 mph
SSW
|
|
Wednesday Night
Jun 10
|
Showers And Thunderstorms Likely
|
70°F |
8 to 16 mph
SSW
|
|
Thursday
Jun 11
|
Chance Showers And Thunderstorms
|
91°F |
8 to 18 mph
SSW
|
|
Thursday Night
Jun 11
|
Showers And Thunderstorms Likely
|
63°F |
3 to 15 mph
W
|
|
Friday
Jun 12
|
Mostly Sunny
|
85°F |
3 to 8 mph
W
|
|
Friday Night
Jun 12
|
Clear then Slight Chance Rain Showers
|
63°F |
2 to 6 mph
WSW
|
|
Saturday
Jun 13
|
Slight Chance Showers And Thunderstorms
|
88°F |
3 to 10 mph
SW
|
|
Saturday Night
Jun 13
|
Chance Showers And Thunderstorms
|
63°F |
6 mph
WNW
|
|
Sunday
Jun 14
|
Chance Showers And Thunderstorms
|
83°F |
5 to 10 mph
N
|
|
Sunday Night
Jun 14
|
Chance Showers And Thunderstorms
|
61°F |
3 to 9 mph
NNE
|
|
Monday
Jun 15
|
Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
80°F |
5 to 10 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Frederick.