Fullerton, IL Weather Forecast
Local 7-day forecast
Showers And Thunderstorms Likely
Track current conditions, temperature changes, wind, and the full daily outlook for Fullerton, IL in one place.
Showers and thunderstorms likely before 4pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 88. East wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Local Weather Overview
This forecast page for Fullerton, 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: Sep 14, 2026 2:45 PM CDT.
The active forecast window currently covers Sep 16 to Sep 20, 2026 for Fullerton, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 16 to Sep 20, 2026
- Latest sync
- Sep 14, 2026 2:45 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Fullerton
Wednesday looks like the warmest upcoming period in Fullerton at 88 degrees F.
Sunday Night is the coolest period ahead with temperatures near 61 degrees F.
The strongest winds are forecast for Saturday at about 10 to 15 mph SW.
Precipitation is mentioned in 10 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 14, 2026 2:45 PM 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 chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 71. Southeast wind around 9 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. West wind around 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
A slight chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 86.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 67.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 85.
A chance of showers and thunderstorms. Partly cloudy, with a low around 64.
A chance of showers and thunderstorms. Partly sunny, with a high near 80.
A chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 16
|
Showers And Thunderstorms Likely
|
88°F |
8 mph
E
|
|
Wednesday Night
Sep 16
|
Chance Showers And Thunderstorms
|
71°F |
9 mph
SE
|
|
Thursday
Sep 17
|
Chance Showers And Thunderstorms
|
88°F |
10 mph
W
|
|
Thursday Night
Sep 17
|
Slight Chance Showers And Thunderstorms
|
67°F |
9 mph
NNE
|
|
Friday
Sep 18
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
86°F |
9 mph
E
|
|
Friday Night
Sep 18
|
Slight Chance Showers And Thunderstorms
|
67°F |
10 mph
SE
|
|
Saturday
Sep 19
|
Chance Rain Showers
|
85°F |
10 to 15 mph
SW
|
|
Saturday Night
Sep 19
|
Chance Showers And Thunderstorms
|
64°F |
9 to 14 mph
N
|
|
Sunday
Sep 20
|
Chance Showers And Thunderstorms
|
80°F |
12 to 15 mph
ENE
|
|
Sunday Night
Sep 20
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
61°F |
9 to 15 mph
ENE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Fullerton.