Chicago, IL 60666 Weather

Cook County1:48 AM CDT41.85°N, 87.65°W

Current conditions

Patchy Fog
50°
Patchy Fog
Feels like 50°
High 65°·Low 48° tonight
WindCalm
Humidity87%
Dew point46°
Pressure30.36 inHg
Visibility10 mi
Cloud cover5%
UV index0 Low
Sunrise7:09 AM
Sunset6:03 PM

Observed at Chicago, Chicago Midway Airport · 23 min ago

Forecast

10-day

  • Overnight

    Patchy fog. Mostly clear. Low around 48, with temperatures rising to around 51 overnight. East southeast wind around 0 mph.

  • Tuesday

    Patchy fog before 10am. Sunny. High near 65, with temperatures falling to around 63 in the afternoon. East wind 0 to 5 mph.

  • Tuesday Night

    Mostly clear, with a low around 48. East southeast wind 0 to 5 mph.

National Weather Service forecast updated 27 min ago.

Hourly

Hourly forecast
  1. Now Patchy Fog 53°
  2. 2 AM Patchy Fog 53°
  3. 3 AM Patchy Fog 53°
  4. 4 AM Patchy Fog 52°
  5. 5 AM Patchy Fog 51°
  6. 6 AM Patchy Fog 50°
  7. 7 AM Patchy Fog 49°
  8. 8 AM Patchy Fog 50°
  9. 9 AM Patchy Fog 54°
  10. 10 AM Sunny 58°
  11. 11 AM Sunny 61°
  12. 12 PM Sunny 63°
  13. 1 PM Sunny 64°
  14. 2 PM Sunny 65°
  15. 3 PM Sunny 65°
  16. 4 PM Sunny 64°
  17. 5 PM Sunny 63°
  18. 6 PM Mostly Clear 60°
  19. 7 PM Mostly Clear 58°
  20. 8 PM Mostly Clear 57°
  21. 9 PM Mostly Clear 57°
  22. 10 PM Mostly Clear 57°
  23. 11 PM Partly Cloudy 56°
  24. Wed12 AM Mostly Clear 55°

10-day forecast

Details
  1. TonightOct 19 Patchy Fog Patchy Fog48°
  2. TodayOct 20 Patchy Fog then Sunny Patchy Fog then Sunny48°65°
  3. WedOct 21 Mostly Sunny Mostly Sunny52°68°
  4. ThuOct 22 Sunny Sunny51°67°
  5. FriOct 23 Sunny Sunny50°65°
  6. SatOct 24 Mostly Sunny Mostly Sunny53°66°
  7. SunOct 25 Partly Sunny Partly Sunny52°69°
  8. MonOct 26 Mostly Sunny Mostly Sunny64°
  9. TueOct 27 Rain Rain0.18 in48°55°
  10. WedOct 28 Cloudy Cloudy42°50°

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

65
Moderate
Fine particles (PM2.5)

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

Forecast

  • TueModerate
  • WedModerate
  • ThuModerate

Chicago, IL reporting area · 48 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 · 66% lit
Moonrise 3:22 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)
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 1 hr ago

Key Messages

- Shallow fog may develop in northeastern Illinois early Tuesday morning. Any fog would dissipate a few hours after sunrise.

- An extended period of dry and above to much above average temperatures is expected through the next 7 days.

Discussion

Issued at 1223 PM CDT Mon Oct 19 2026

The only item of note is a threat for shallow fog overnight into tomorrow morning near Lake Michigan where a modestly more moist environment will advect inland. Otherwise, no significant weather is expected the next 7 days 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 probably only result in slightly cooler conditions right near the lake. Other than a bit of mid-high level cloudiness this afternoon, much of the week looks to be mostly sunny.

- Izzi/Borchardt

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.