Joliet, IL 60431 Weather

Will County1:33 AM CDT41.47°N, 87.94°W

Current conditions

Clear
50°
Clear
Feels like 49°
High 71°·Low 43° tonight
WindESE 3 mph
Humidity82%
Dew point45°
Pressure30.30 inHg
Visibility10.0 mi
Cloud cover15%
UV index0 Low
Sunrise7:11 AM
Sunset6:03 PM

Observed at Lewis University Airport · 38 min ago

Forecast

10-day

  • Tonight

    Mostly clear, with a low around 43. East southeast wind 0 to 5 mph.

  • Wednesday

    Sunny. High near 71, with temperatures falling to around 69 in the afternoon. Southwest wind around 0 mph.

  • Wednesday Night

    Mostly clear, with a low around 47. North wind around 0 mph.

National Weather Service forecast updated 10 hrs ago.

Hourly

Hourly forecast
  1. Now Mostly Clear 47°
  2. 2 AM Mostly Clear 46°
  3. 3 AM Mostly Clear 45°
  4. 4 AM Mostly Clear 44°
  5. 5 AM Mostly Clear 44°
  6. 6 AM Sunny 43°
  7. 7 AM Sunny 42°
  8. 8 AM Sunny 45°
  9. 9 AM Sunny 52°
  10. 10 AM Sunny 58°
  11. 11 AM Sunny 62°
  12. 12 PM Sunny 66°
  13. 1 PM Sunny 70°
  14. 2 PM Sunny 71°
  15. 3 PM Sunny 71°
  16. 4 PM Sunny 71°
  17. 5 PM Sunny 69°
  18. 6 PM Clear 65°
  19. 7 PM Mostly Clear 60°
  20. 8 PM Clear 58°
  21. 9 PM Clear 56°
  22. 10 PM Mostly Clear 54°
  23. 11 PM Mostly Clear 53°
  24. Thu12 AM Mostly Clear 52°

10-day forecast

Details
  1. TonightOct 20 Mostly Clear Mostly Clear43°
  2. TodayOct 21 Sunny Sunny47°71°
  3. ThuOct 22 Sunny Sunny47°72°
  4. FriOct 23 Sunny Sunny47°70°
  5. SatOct 24 Mostly Sunny Mostly Sunny51°72°
  6. SunOct 25 Mostly Sunny Mostly Sunny52°74°
  7. MonOct 26 Partly Sunny Partly Sunny12%47°67°
  8. TueOct 27 Mostly Sunny Mostly Sunny12%60°
  9. WedOct 28 Mostly sunny Mostly sunny37°51°
  10. ThuOct 29 Cloudy Cloudy33°53°

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

Radar

Full map
Open the National Weather Service radar (the map here needs JavaScript).

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Air quality

66
Moderate
Fine particles (PM2.5)

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

Forecast

  • WedModerate
  • ThuModerate
  • FriModerate

Joliet and Will County, 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 7:11 AM
Sunset 6:03 PM
Daylight 10 h 52 min (−2 min 37 s tomorrow)
Waxing Gibbous · 75% lit
Moonrise 3:46 PM Moonset 2:09 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Record high85° (1953)
Record low17° (1952)
Wettest1.82 in (1933)
Month to date0.67 in (normal 0.00 in)

Joliet, records since 1893. 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

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