Chicago, IL 60678 Weather

Cook County6:53 AM CDT41.81°N, 87.69°W
Dense Fog Advisory until 9:00 AM Tue

Current conditions

Patchy Fog
46°
Patchy Fog
Feels like 46°
High 66°·Low 48°
WindCalm
Humidity93%
Dew point45°
Pressure30.40 inHg
Visibility10 mi
Cloud cover19%
UV index0 Low
Sunrise7:09 AM
Sunset6:03 PM

Observed at Chicago, Chicago Midway Airport · 13 min ago

Forecast

10-day

  • Today

    Patchy fog before 8am. Sunny. High near 66, with temperatures falling to around 64 in the afternoon. East northeast wind 0 to 10 mph.

  • Tonight

    Patchy fog after 4am. Partly cloudy, with a low around 48. East southeast wind 0 to 5 mph.

  • Wednesday

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

National Weather Service forecast updated 1 hr ago.

Hourly

Hourly forecast
  1. Now Patchy Fog 49°
  2. 7 AM Patchy Fog 48°
  3. 8 AM Mostly Sunny 48°
  4. 9 AM Mostly Sunny 52°
  5. 10 AM Sunny 57°
  6. 11 AM Sunny 60°
  7. 12 PM Sunny 63°
  8. 1 PM Sunny 65°
  9. 2 PM Sunny 66°
  10. 3 PM Sunny 66°
  11. 4 PM Sunny 66°
  12. 5 PM Sunny 64°
  13. 6 PM Mostly Clear 60°
  14. 7 PM Mostly Clear 58°
  15. 8 PM Mostly Clear 57°
  16. 9 PM Mostly Clear 57°
  17. 10 PM Mostly Clear 56°
  18. 11 PM Partly Cloudy 55°
  19. Wed12 AM Partly Cloudy 54°
  20. 1 AM Partly Cloudy 53°
  21. 2 AM Partly Cloudy 52°
  22. 3 AM Partly Cloudy 50°
  23. 4 AM Patchy Fog 49°
  24. 5 AM Patchy Fog 49°

10-day forecast

Details
  1. TodayOct 20 Patchy Fog then Sunny Patchy Fog then Sunny48°66°
  2. WedOct 21 Patchy Fog then Mostly Sunny Patchy Fog then Mostly Sunny52°70°
  3. ThuOct 22 Sunny Sunny51°68°
  4. FriOct 23 Sunny Sunny50°66°
  5. SatOct 24 Mostly Sunny Mostly Sunny52°67°
  6. SunOct 25 Partly Sunny Partly Sunny52°69°
  7. MonOct 26 Partly Sunny Partly Sunny15%49°64°
  8. TueOct 27 Cloudy Cloudy46°55°
  9. WedOct 28 Cloudy Cloudy44°52°
  10. ThuOct 29 Sunny Sunny42°55°

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

71
Moderate
Fine particles (PM2.5)

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

Forecast

  • TueModerate
  • WedModerate
  • ThuModerate

Chicago, IL reporting area · 53 min 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 53 min (−2 min 41 s tomorrow)
Waxing Gibbous · 68% lit
Moonrise 3:23 PM Moonset 1:03 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low61° / 44°
Record high86° (1953)
Record low24° (1930)
Wettest1.65 in (1916)
Yesterday68° / 43°
Month to date2.54 in (normal 2.14 in)

Chicago Area, records since 1872. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in LOT, issued 4 hrs ago

Key Messages

- Some ground fog may develop within 10-15 miles of Lake Michigan during early morning hours the next few days. Any fog would then quickly dissipate after sunrise.

- An extended period of dry and above to much above average temperatures is expected through the upcoming weekend.

Discussion

Issued at 154 AM CDT Tue Oct 20 2026

No significant weather is expected through the upcoming weekend with above to much above average temperatures each day. Generally light winds should allow weak lake breezes to form each of the next several afternoons, but only result in slightly cooler conditions right near the lake. A modest increase in moisture in the wake of the afternoon lake breezes could allow for some ground fog to form during the early morning hours the next few days. Otherwise, look for mostly sunny conditions for the remainder of the work week.

- Borchardt/Izzi

Aviation

Issued at 1230 AM CDT Tue Oct 20 2026

Key Aviation Messages for the current TAF period:

- Patchy fog possible around sunrise.

Winds are expected to be light and variable, if not outright calm through the overnight. There is a chance for patchy fog toward daybreak for Chicago terminals, with better chances closer to the lake. There is still uncertainty with how low visibilities will go, but will be monitored through the night. But the expectation is that any fog that does form should dissipate after sunrise for a return to VFR.

Light winds will prevail through the day, mostly out of the east. There is another chance for patchy fog tomorrow morning. Given there is little change to the overall weather pattern tomorrow, would like to see how this morning plays out first before adding fog to the TAFs for Wednesday morning.

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 4Search index and reflects what the press published. Terms of use.