Chicago, IL 60633 Weather

Cook County9:35 PM CDT41.66°N, 87.56°W

Current conditions

Clear
53°
Clear
Feels like 53°
High 70° Wednesday·Low 45° tonight
WindCalm
Humidity80%
Dew point47°
Pressure30.32 inHg
Visibility10.0 mi
Cloud cover21%
UV index0 Low
Sunrise7:09 AM
Sunset6:03 PM

Observed at Lansing Municipal Airport · 40 min ago

Forecast

10-day

  • Tonight

    Patchy fog after 4am. Mostly clear, with a low around 45. East wind 0 to 5 mph.

  • Wednesday

    Patchy fog before 8am. Sunny. High near 70, with temperatures falling to around 67 in the afternoon. South southwest wind around 0 mph.

  • Wednesday Night

    Mostly clear, with a low around 49. South wind around 0 mph.

National Weather Service forecast updated 11 hrs ago.

Hourly

Hourly forecast
  1. Now Mostly Clear 56°
  2. 10 PM Mostly Clear 55°
  3. 11 PM Mostly Clear 54°
  4. Wed12 AM Partly Cloudy 52°
  5. 1 AM Partly Cloudy 51°
  6. 2 AM Partly Cloudy 50°
  7. 3 AM Partly Cloudy 49°
  8. 4 AM Patchy Fog 47°
  9. 5 AM Patchy Fog 46°
  10. 6 AM Patchy Fog 46°
  11. 7 AM Patchy Fog 45°
  12. 8 AM Mostly Sunny 48°
  13. 9 AM Mostly Sunny 52°
  14. 10 AM Sunny 56°
  15. 11 AM Sunny 60°
  16. 12 PM Sunny 64°
  17. 1 PM Sunny 68°
  18. 2 PM Sunny 69°
  19. 3 PM Sunny 69°
  20. 4 PM Sunny 69°
  21. 5 PM Sunny 67°
  22. 6 PM Partly Cloudy 63°
  23. 7 PM Mostly Clear 60°
  24. 8 PM Partly Cloudy 58°

10-day forecast

Details
  1. TodayOct 20 Sunny Sunny45°67°
  2. WedOct 21 Patchy Fog then Sunny Patchy Fog then Sunny49°70°
  3. ThuOct 22 Sunny Sunny50°69°
  4. FriOct 23 Sunny Sunny49°67°
  5. SatOct 24 Mostly Sunny Mostly Sunny53°68°
  6. SunOct 25 Partly Sunny Partly Sunny52°70°
  7. MonOct 26 Partly Sunny Partly Sunny15%50°66°
  8. TueOct 27 Rain Rain0.20 in50°55°
  9. WedOct 28 Mostly sunny Mostly sunny40°51°
  10. ThuOct 29 Partly cloudy Partly cloudy36°53°

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

Radar

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Weather news near Chicago

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Air quality

54
Moderate
Fine particles (PM2.5)

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

Forecast

  • TueModerate
  • WedModerate

Hammond-Gary, IN reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:09 AM
Sunset 6:03 PM
Daylight 10 h 54 min (−2 min 39 s tomorrow)
Waxing Gibbous · 73% lit
Moonrise 3:22 PM Moonset 1:03 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low62° / 45°
Record high86° (1953)
Record low20° (1930)
Wettest0.86 in (1934)
Yesterday68° / 44°
Month to date2.13 in (normal 2.18 in)

Chicago Midway Ap, records since 1928. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in LOT, issued 3 hrs 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 624 PM CDT Tue Oct 20 2026

Key messages for the 00Z TAF period:

* Dense fog possible late tonight into early Wednesday, primarily at Chicago sites

Light easterlies this evening will go variable overnight and settle at SW by Wednesday morning. A lake breeze will flip winds to E in Chicago during the late afternoon while remaining light.

Fog is anticipated to develop late tonight west of the lakeshore, similar to this morning. A period of dense fog with LIFR visibilities will be possible, especially at the Chicago sites. Fog is not expected at RFD and may leave DPA and GYY largely alone. The fog may persist for a couple of hours past dawn before fully burning off. More SKC is then expected after early morning.

Doom

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.