Frontenac, IL Weather Forecast
Local 7-day forecast
Patchy Fog
Track current conditions, temperature changes, wind, and the full daily outlook for Frontenac, IL in one place.
Patchy fog. Clear, with a low around 30. Northwest wind around 5 mph.
Local Weather Overview
This forecast page for Frontenac, 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: Nov 7, 2026 5:17 AM CST.
The active forecast window currently covers Nov 7 to Nov 13, 2026 for Frontenac, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Nov 7 to Nov 13, 2026
- Latest sync
- Nov 7, 2026 5:17 AM CST
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Frontenac
Tuesday looks like the warmest upcoming period in Frontenac at 62 degrees F.
Overnight is the coolest period ahead with temperatures near 30 degrees F.
The strongest winds are forecast for Sunday at about 10 to 15 mph W.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Nov 7, 2026 5:17 AM CST
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KLOT
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Patchy fog before 8am. Mostly sunny. High near 50, with temperatures falling to around 44 in the afternoon. West wind 5 to 10 mph.
Partly cloudy, with a low around 36. West southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Patchy fog between 7am and 10am. Mostly sunny, with a high near 59. West wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly clear, with a low around 35. West northwest wind 0 to 10 mph, with gusts as high as 20 mph.
Mostly sunny, with a high near 60.
Mostly clear, with a low around 43.
Sunny, with a high near 62.
Partly cloudy, with a low around 38.
Mostly sunny, with a high near 55.
Mostly cloudy, with a low around 38.
A slight chance of rain. Partly sunny, with a high near 48.
A slight chance of rain before midnight, then a slight chance of rain and snow. Mostly cloudy, with a low around 33.
Partly sunny, with a high near 47.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Nov 7
|
Patchy Fog
|
30°F |
5 mph
NW
|
|
Saturday
Nov 7
|
Patchy Fog then Mostly Sunny
|
50°F |
5 to 10 mph
W
|
|
Saturday Night
Nov 7
|
Partly Cloudy
|
36°F |
5 to 10 mph
WSW
|
|
Sunday
Nov 8
|
Patchy Fog then Mostly Sunny
|
59°F |
10 to 15 mph
W
|
|
Sunday Night
Nov 8
|
Mostly Clear
|
35°F |
0 to 10 mph
WNW
|
|
Monday
Nov 9
|
Mostly Sunny
|
60°F |
0 to 10 mph
WSW
|
|
Monday Night
Nov 9
|
Mostly Clear
|
43°F |
5 to 10 mph
WSW
|
|
Tuesday
Nov 10
|
Sunny
|
62°F |
5 mph
WNW
|
|
Tuesday Night
Nov 10
|
Partly Cloudy
|
38°F |
0 to 5 mph
WNW
|
|
Veterans Day
Nov 11
|
Mostly Sunny
|
55°F |
0 to 5 mph
NNW
|
|
Wednesday Night
Nov 11
|
Mostly Cloudy
|
38°F |
5 to 10 mph
N
|
|
Thursday
Nov 12
|
Slight Chance Rain
|
48°F |
10 to 15 mph
N
|
|
Thursday Night
Nov 12
|
Slight Chance Rain then Slight Chance Rain And Snow
|
33°F |
10 mph
N
|
|
Friday
Nov 13
|
Partly Sunny
|
47°F |
10 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Frontenac.