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Mchenry, IL 60050 Weather
Current conditions
Observed at Chicago/Waukegan Regional Airport · 22 min ago
Forecast
10-day-
Overnight
Patchy fog after 3am. Partly cloudy, with a low around 40. Southeast wind around 0 mph.
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Wednesday
Patchy fog before 8am. Sunny. High near 71, with temperatures falling to around 69 in the afternoon. Southwest wind 0 to 5 mph.
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Wednesday Night
Mostly clear. Low around 46, with temperatures rising to around 48 overnight. West southwest wind around 0 mph.
National Weather Service forecast updated 26 min ago.
Hourly
Hourly forecast- Now44°
- 2 AM43°
- 3 AM43°
- 4 AM42°
- 5 AM41°
- 6 AM40°
- 7 AM40°
- 8 AM43°
- 9 AM50°
- 10 AM57°
- 11 AM62°
- 12 PM66°
- 1 PM69°
- 2 PM70°
- 3 PM70°
- 4 PM71°
- 5 PM69°
- 6 PM66°
- 7 PM62°
- 8 PM57°
- 9 PM54°
- 10 PM53°
- 11 PM52°
- Thu12 AM51°
10-day forecast
Details- TonightOct 20Patchy Fog40°
- TodayOct 21Patchy Fog then Sunny46°71°
- ThuOct 22Sunny44°71°
- FriOct 23Sunny50°70°
- SatOct 24Partly Sunny52°70°
- SunOct 25Partly Sunny14%49°70°
- MonOct 26Slight Chance Rain Showers18%44°62°
- TueOct 27Mostly Sunny12%57°
- WedOct 28Sunny35°49°
- ThuOct 29Partly cloudy32°53°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news near McHenry
More weather news-
Dense fog advisory issued for parts of Chicago area with with near-zero visibility on roadsParts of the Chicago area are under a dense fog advisory Tuesday morning, with visibility close to zero leading to dangerous driving conditions for the morning commute. The advisory, issued for Central Cook, Lake…
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First frost of season possible Saturday morningA group of people cross the La Salle Street Bridge in The Loop on Feb. 4, 2026. Temperatures could dip below freezing early Saturday morning in areas outside Cook County, bringing a brief interruption to the Chicago…
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Chicago weather: Cloudy, rainy Friday ahead of warmer, sunnier weekendKaitlin Cody has your Chicago weather update! CHICAGO - A cloudy and damp day will give way to a much sunnier stretch across the Chicago area. Friday will bring cloudy skies and temperatures in the low 50s. Rain could…
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‘Coldest night of the season:' Frost advisory, freeze warning issued for parts of Chicago areaTemps drop below the freezing mark for parts of the area Saturday morning Here it comes, Chicago: Frost advisories and freeze warnings were issued for parts of the area, with temperatures dropping into the 30s overnight…
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Tropospheric Conditions Affect UHF & VHF Signals Across the CoastOften in the spring and fall television and radio signals on the MS Gulf Coast can be adversely affected by a meteorological event known as tropospheric ducting. Here is a technical explanation for what is causing…
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Mostly cloudy and dry today, with soggy weather returning ThursdayMostly cloudy and dry today, with a soggy weather returning Thursday WIFR ROCKFORD, Ill. (Rockford News First) - Not much precipitation fell earlier this morning, with Rockford picking up about .10″of rain. Temperatures…
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Another beautiful day ahead for Central IllinoisDECATUR, Ill. (WAND) – If you’re looking for a reason to get outside, Tuesday is your day. A high-pressure system settling over the Midwest is bringing abundant sunshine and calm winds to Central Illinois, with…
- Central Illinois Winter Weather Outlook
The winter weather outlook for central and southeast Illinois has been released, and a detailed summary is available at this link. Some of the highlights: Current Conditions Latest Observations Daily Climate Maps…
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One of the year’s most pleasant weather stretches arrives in Central IllinoisDECATUR, Ill. (WAND) – A beautiful stretch of sunshine and mild temperatures is settling into the region, and it’s the perfect time to get outside and enjoy it. High pressure is taking control of the Midwest, locking in…
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A great week ahead for Central IllinoisWAND DECATUR, Ill. (WAND) – A wonderful weekend across Central Illinois carries into the start of the workweek. Overnight lows dip back into the upper 30s tonight with a small risk for patchy frost, though coverage will…
Air quality
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
Almanac
MonthlyLake Geneva Wwtp, records since 1945. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Elgin 33 km
- Kenosha 48 km
- Waukegan 37 km
- Arlington Heights 37 km
- Evanston 59 km
- Schaumburg 37 km
- Palatine 33 km
- Skokie 57 km
- Des Plaines 47 km
- Mount Prospect 42 km
- Wheaton 54 km
- Hoffman Estates 37 km
Forecasters' discussion
From the National Weather Service office in LOT, issued 49 min ago
Key Messages
- Areas of fog, including potentially dense fog, may develop again late tonight into early Wednesday morning in and near the Chicago metro.
- An extended period of dry and above to much above average temperatures is expected through the upcoming weekend.
Discussion
Issued at 226 PM CDT Tue Oct 20 2026
An Omega block that is in place over the CONUS is expected to persist through the end of the week. The associated ridge axis will only ever so slowly crawl eastward over the coming days, which will maintain broad surface high pressure across the region. As a result, dry conditions with an abundance of sunshine will continue through the remainder of the week with high temperatures remaining above to well above normal for this time of year. Daily lake breezes will cause the coolest (low- mid 60s) high temperatures to be observed near Lake Michigan each day.
Much like last night/early this morning, optimal radiational cooling conditions will likely allow for fog to develop late tonight into tomorrow morning and possibly again in the coming nights/mornings. This will particularly be the case in and near the Chicago metro within the footprint of the marine-influenced air brought inland during the daytime, where the fog could become dense once again.
There is pretty good ensemble agreement at this point in time that the blocking pattern will break down by early next week. This will allow for a cold front to drop through the region sometime on Monday or Tuesday, resulting in a return to cooler and more seasonable temperatures for the middle of next week. The frontal passage may bring a chance for precipitation to the area early-mid next week, but support for this across the latest suite of ensemble guidance is not ubiquitous, and there are considerable temporal differences with when this next potential opportunity for precipitation may arrive as well.
Ogorek
Aviation
Issued at 1213 AM CDT Wed Oct 21 2026
Key Aviation Messages for the current TAF period:
- Fog, locally dense, is possible prior to sunrise, mainly at Chicago Terminals north of a KARR to KMDW line.
Winds are expected to be light and calm through the night. There is another chance for fog to develop this morning. It has already started to develop around and north of KENW where obs are already reporting 1/4SM. While fog development is not a certainty, if/when it does occur, it can be locally dense with vis potentially near zero. Similar to yesterday, vis improvement should be fairly quick after sunrise.
Light southwest winds are expected through much of the day before becoming more southeasterly toward sunset. Once the fog clears, VFR conditions are expected through the end of the TAF. There is another chance for patchy fog tomorrow morning, but the chances are not as great as recently.
DK
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 4Conservative index and reflects what the press published. Terms of use.