Grafton, IL Weather Forecast
Local 7-day forecast
Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Grafton, IL in one place.
A slight chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 83. Southeast wind around 7 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Grafton, 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: May 29, 2026 2:43 PM CDT.
The active forecast window currently covers May 31 to Jun 4, 2026 for Grafton, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 31 to Jun 4, 2026
- Latest sync
- May 29, 2026 2:43 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Grafton
Monday looks like the warmest upcoming period in Grafton at 86 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 60 degrees F.
The strongest winds are forecast for Tuesday at about 5 to 8 mph E.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- May 29, 2026 2:43 PM CDT
- Coverage
- 5 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
A slight chance of showers and thunderstorms between 7pm and 1am, then showers and thunderstorms likely. Partly cloudy, with a low around 64. Chance of precipitation is 60%.
Showers and thunderstorms likely before 7am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 60%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 63. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 83. Chance of precipitation is 20%.
Partly cloudy, with a low around 60.
Sunny, with a high near 82.
Partly cloudy, with a low around 61.
Mostly sunny, with a high near 85.
A slight chance of rain showers after 1am. Partly cloudy, with a low around 65. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
May 31
|
Slight Chance Showers And Thunderstorms
|
83°F |
7 mph
SE
|
|
Sunday Night
May 31
|
Slight Chance Showers And Thunderstorms
|
64°F |
2 to 7 mph
SE
|
|
Monday
Jun 1
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
86°F |
2 to 7 mph
E
|
|
Monday Night
Jun 1
|
Chance Showers And Thunderstorms
|
63°F |
3 to 7 mph
NE
|
|
Tuesday
Jun 2
|
Slight Chance Showers And Thunderstorms then Mostly Sunny
|
83°F |
5 to 8 mph
E
|
|
Tuesday Night
Jun 2
|
Partly Cloudy
|
60°F |
2 to 7 mph
E
|
|
Wednesday
Jun 3
|
Sunny
|
82°F |
2 to 7 mph
E
|
|
Wednesday Night
Jun 3
|
Partly Cloudy
|
61°F |
2 to 7 mph
SE
|
|
Thursday
Jun 4
|
Mostly Sunny
|
85°F |
2 to 7 mph
SE
|
|
Thursday Night
Jun 4
|
Partly Cloudy then Slight Chance Rain Showers
|
65°F |
2 to 7 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grafton.
