Algonquin, IL Weather Forecast
Local 7-day forecast
Mostly Sunny then Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Algonquin, IL in one place.
A slight chance of rain showers between 1pm and 4pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Southwest wind around 5 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Algonquin, 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: Jul 14, 2026 6:31 PM CDT.
The active forecast window currently covers Jul 16 to Jul 20, 2026 for Algonquin, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 16 to Jul 20, 2026
- Latest sync
- Jul 14, 2026 6:31 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Algonquin
Thursday looks like the warmest upcoming period in Algonquin at 91 degrees F.
Monday Night is the coolest period ahead with temperatures near 66 degrees F.
The strongest winds are forecast for Saturday at about 5 to 10 mph W.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 6:31 PM CDT
- Coverage
- 5 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
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 70. Chance of precipitation is 20%.
A slight chance of rain showers between 7am and 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers and thunderstorms likely. Mostly sunny, with a high near 89.
Showers and thunderstorms likely before 7pm, then a slight chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 71.
A chance of showers and thunderstorms after 1pm. Sunny, with a high near 89.
A chance of showers and thunderstorms before 1am. Mostly clear, with a low around 68.
Mostly sunny, with a high near 86.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 67.
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 86.
A slight chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Jul 16
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
91°F |
5 mph
SW
|
|
Thursday Night
Jul 16
|
Slight Chance Showers And Thunderstorms
|
70°F |
0 to 5 mph
E
|
|
Friday
Jul 17
|
Slight Chance Showers And Thunderstorms
|
89°F |
0 to 5 mph
S
|
|
Friday Night
Jul 17
|
Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms
|
71°F |
5 mph
SW
|
|
Saturday
Jul 18
|
Sunny then Chance Showers And Thunderstorms
|
89°F |
5 to 10 mph
W
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms
|
68°F |
5 to 10 mph
NNW
|
|
Sunday
Jul 19
|
Mostly Sunny
|
86°F |
5 mph
NNW
|
|
Sunday Night
Jul 19
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
67°F |
5 mph
SSW
|
|
Monday
Jul 20
|
Slight Chance Showers And Thunderstorms
|
86°F |
5 to 10 mph
WSW
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
66°F |
5 to 10 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Algonquin.
