Algonquin, IL 60102 Weather

McHenry County7:30 PM CDT42.16°N, 88.31°W

Current conditions

Clear
66°
Clear
Feels like 66°
High 72° Thursday·Low 45° tonight
WindS 3 mph
Humidity49%
Dew point46°
Pressure30.21 inHg
Visibility10 mi
Cloud cover5%
UV index0 Low
Sunrise7:13 AM
Sunset6:04 PM

Observed at Chicago / West Chicago, Dupage Airport · 1 hr ago

Forecast

10-day

  • Tonight

    Patchy fog after 3am. Mostly clear, with a low around 45. West northwest wind around 0 mph.

  • Thursday

    Patchy fog before 9am. Sunny. High near 72, with temperatures falling to around 69 in the afternoon. Northeast wind 0 to 5 mph.

  • Thursday Night

    Partly cloudy, with a low around 46. East wind 0 to 5 mph.

National Weather Service forecast updated 4 hrs ago.

Hourly

Hourly forecast
  1. Now Clear 60°
  2. 8 PM Clear 57°
  3. 9 PM Mostly Clear 55°
  4. 10 PM Clear 53°
  5. 11 PM Clear 51°
  6. Thu12 AM Clear 49°
  7. 1 AM Clear 48°
  8. 2 AM Mostly Clear 48°
  9. 3 AM Patchy Fog 48°
  10. 4 AM Patchy Fog 47°
  11. 5 AM Patchy Fog 46°
  12. 6 AM Patchy Fog 45°
  13. 7 AM Patchy Fog 46°
  14. 8 AM Patchy Fog 48°
  15. 9 AM Sunny 52°
  16. 10 AM Sunny 60°
  17. 11 AM Sunny 64°
  18. 12 PM Sunny 68°
  19. 1 PM Sunny 70°
  20. 2 PM Sunny 71°
  21. 3 PM Sunny 72°
  22. 4 PM Sunny 71°
  23. 5 PM Sunny 69°
  24. 6 PM Mostly Clear 66°

10-day forecast

Details
  1. TodayOct 21 Sunny Sunny45°72°
  2. ThuOct 22 Patchy Fog then Sunny Patchy Fog then Sunny46°72°
  3. FriOct 23 Mostly Sunny Mostly Sunny49°71°
  4. SatOct 24 Mostly Sunny Mostly Sunny51°70°
  5. SunOct 25 Partly Sunny Partly Sunny51°72°
  6. MonOct 26 Partly Sunny Partly Sunny12%48°66°
  7. TueOct 27 Slight Chance Rain Showers Slight Chance Rain Showers22%45°61°
  8. WedOct 28 Cloudy Cloudy0.16 in48°62°
  9. ThuOct 29 Heavy rain Heavy rain0.65 in38°59°
  10. FriOct 30 Sunny Sunny36°55°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
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Weather news near Algonquin

More weather news

Air quality

63
Moderate
Fine particles (PM2.5)

Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Forecast

  • WedModerate
  • ThuModerate
  • FriModerate

North and West Suburbs (Chicago), IL reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:13 AM
Sunset 6:04 PM
Daylight 10 h 50 min (−2 min 42 s tomorrow)
Waxing Gibbous · 81% lit
Moonrise 3:48 PM Moonset 2:10 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low58° / 40°
Record high81° (2003)
Record low25° (2018)
Wettest0.83 in (1965)
Yesterday65° / 40°, <0.01 in
Month to date2.55 in (normal 2.23 in)

Barrington 3sw, records since 1962. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in LOT, issued 5 hrs ago

Key Messages

- The dry and unseasonably mild weather will continue through the upcoming weekend.

Discussion

Issued at 136 PM CDT Wed Oct 21 2026

An anomalously strong mid-level ridge over the central CONUS will anchor omega blocking across much of North America over the next several days. Meanwhile, an elongated surface ridge extending from the Lower Mississippi River Valley to the Canadian Maritimes is in the processes of congealing with another expansive high pressure shifting toward the Upper Great Lakes. As a result, quiet weather with unseasonably warm conditions will continue through the upcoming weekend. As was observed the past few mornings, generally clear skies and light/calm winds should promote shallow fog across primarily interior northern Illinois late tonight through sunrise Thursday.

The blocking pattern will slowly break down early next week as the ridge flattens and a southwestern upper-level low begins to meander toward the central CONUS. A series of smaller troughs on the periphery of a developing longwave trough across the north Pacific and western Canada will eventually pick up the southwestern low. Consensus guidance suggests that the influence of the low on our area could occur as early as Monday night, but more likely Tuesday and Wednesday. Cooler and more seasonable conditions would accompany this system.

Kluber

Aviation

Issued at 1217 PM CDT Wed Oct 21 2026

Expect generally VFR conditions with a few mid-level clouds through the period as high pressure drifts over the area. However, as has been observed during the past few mornings, MIFG/BCFG is likely at RFD/DPA and VFR BR is possible at ORD late tonight through sunrise Thursday.

Light SW winds are expected this afternoon, though a weak lake breeze may wash out and turn winds SE 5 knots or less over ORD and especially MDW toward sunset. Winds will become calm or light and VRB tonight into Thursday morning, with a lake- enhanced NE wind shift likely by Thursday afternoon.

Kluber

Lot Watches

IL...None. IN...None. LM...None.

Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Search index and reflects what the press published. Terms of use.