Mendon, IL Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Mendon, IL in one place.
Mostly sunny, with a high near 78. Southwest wind around 10 mph.
Local Weather Overview
This forecast page for Mendon, 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 9:48 AM CDT.
The active forecast window currently covers Apr 22 to Apr 27, 2026 for Mendon, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 22 to Apr 27, 2026
- Latest sync
- Apr 21, 2026 9:48 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Mendon
Thursday looks like the warmest upcoming period in Mendon at 83 degrees F.
Saturday Night is the coolest period ahead with temperatures near 50 degrees F.
The strongest winds are forecast for Thursday at about 12 to 18 mph S.
Precipitation is mentioned in 10 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 21, 2026 9:48 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
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 59. South wind around 10 mph.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. South wind 12 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 20%.
A chance of showers and thunderstorms before 1am, then showers and thunderstorms. Mostly cloudy, with a low around 60. Chance of precipitation is 90%.
Showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 73. Chance of precipitation is 90%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 51. Chance of precipitation is 30%.
A slight chance of rain showers. Mostly sunny, with a high near 71. Chance of precipitation is 20%.
A slight chance of rain showers. Partly cloudy, with a low around 50. Chance of precipitation is 20%.
A slight chance of rain showers before 7am, then a chance of showers and thunderstorms. Partly sunny, with a high near 71. Chance of precipitation is 30%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 55. Chance of precipitation is 60%.
Showers and thunderstorms likely. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 50. Chance of precipitation is 50%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Apr 22
|
Mostly Sunny
|
78°F |
10 mph
SW
|
|
Wednesday Night
Apr 22
|
Mostly Clear
|
59°F |
10 mph
S
|
|
Thursday
Apr 23
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
83°F |
12 to 18 mph
S
|
|
Thursday Night
Apr 23
|
Chance Showers And Thunderstorms
|
60°F |
12 to 17 mph
S
|
|
Friday
Apr 24
|
Showers And Thunderstorms
|
73°F |
12 mph
W
|
|
Friday Night
Apr 24
|
Chance Showers And Thunderstorms
|
51°F |
10 mph
N
|
|
Saturday
Apr 25
|
Slight Chance Rain Showers
|
71°F |
10 mph
NE
|
|
Saturday Night
Apr 25
|
Slight Chance Rain Showers
|
50°F |
9 mph
NE
|
|
Sunday
Apr 26
|
Chance Showers And Thunderstorms
|
71°F |
10 mph
E
|
|
Sunday Night
Apr 26
|
Showers And Thunderstorms Likely
|
55°F |
12 mph
E
|
|
Monday
Apr 27
|
Showers And Thunderstorms Likely
|
71°F |
14 mph
SE
|
|
Monday Night
Apr 27
|
Chance Showers And Thunderstorms
|
50°F |
13 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Mendon.
