Deerfield, IL Weather

Lake County7:07 PM CDT42.17°N, 87.84°WElevation 686 ft

Current conditions

Mostly Clear
64°
Mostly Clear
Feels like 64°
High 67° Thursday·Low 50° tonight
WindESE 3 mph
Humidity52%
Dew point46°
Pressure30.22 inHg
Visibility10 mi
Cloud cover14%
UV index0 Low
Sunrise7:12 AM
Sunset6:02 PM

Observed at Chicago / Wheeling, Pal-Waukee Airport · 1 hr ago

Forecast

10-day

  • Wednesday Night

    Partly cloudy, with a low around 50. Southwest wind 0 to 5 mph.

  • Thursday

    Mostly sunny, with a high near 67. North northeast wind 0 to 5 mph.

  • Thursday Night

    Mostly clear, with a low around 51. East southeast wind around 5 mph.

National Weather Service forecast updated 1 day ago.

Hourly

Hourly forecast
  1. Now Mostly Clear 60°
  2. 8 PM Mostly Clear 58°
  3. 9 PM Mostly Clear 56°
  4. 10 PM Mostly Clear 55°
  5. 11 PM Partly Cloudy 54°
  6. Thu12 AM Partly Cloudy 53°
  7. 1 AM Partly Cloudy 53°
  8. 2 AM Partly Cloudy 52°
  9. 3 AM Partly Cloudy 52°
  10. 4 AM Partly Cloudy 51°
  11. 5 AM Partly Cloudy 50°
  12. 6 AM Mostly Sunny 50°
  13. 7 AM Partly Sunny 50°
  14. 8 AM Partly Sunny 52°
  15. 9 AM Partly Sunny 57°
  16. 10 AM Mostly Sunny 61°
  17. 11 AM Sunny 64°
  18. 12 PM Sunny 66°
  19. 1 PM Sunny 66°
  20. 2 PM Sunny 67°
  21. 3 PM Sunny 66°
  22. 4 PM Sunny 65°
  23. 5 PM Sunny 63°
  24. 6 PM Mostly Clear 60°

10-day forecast

Details
  1. TonightOct 20 Partly Cloudy then Areas Of Fog Partly Cloudy then Areas Of Fog45°
  2. TodayOct 21 Areas Of Fog then Sunny Areas Of Fog then Sunny50°68°
  3. ThuOct 22 Mostly Sunny Mostly Sunny51°67°
  4. FriOct 23 Sunny Sunny50°66°
  5. SatOct 24 Mostly Sunny Mostly Sunny53°68°
  6. SunOct 25 Partly Sunny Partly Sunny10%51°70°
  7. MonOct 26 Partly Sunny Partly Sunny16%47°63°
  8. TueOct 27 Slight Chance Rain Showers then Partly Sunny Slight Chance Rain Showers then Partly Sunny15%57°
  9. WedOct 28 Mostly sunny Mostly sunny38°50°
  10. ThuOct 29 Cloudy Cloudy35°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
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Weather news near Deerfield

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Air quality

49
Good
Ozone

Air quality is satisfactory, and air pollution poses little or no risk.

Forecast

  • WedModerate
  • ThuModerate
  • FriModerate

Lake County, IL reporting area · 2 hrs ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:12 AM
Sunset 6:02 PM
Daylight 10 h 50 min (−2 min 41 s tomorrow)
Waxing Gibbous · 81% lit
Moonrise 3:46 PM Moonset 2:08 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low60° / 44°
Month to date2.54 in (normal 2.24 in)

Chicago Ohare Intl Ap, records since 1958. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in LOT, issued 5 hrs ago

Key Messages

- The dry and unseasonably mild weather will continue through the upcoming weekend.

Discussion

Issued at 136 PM CDT Wed Oct 21 2026

An anomalously strong mid-level ridge over the central CONUS will anchor omega blocking across much of North America over the next several days. Meanwhile, an elongated surface ridge extending from the Lower Mississippi River Valley to the Canadian Maritimes is in the processes of congealing with another expansive high pressure shifting toward the Upper Great Lakes. As a result, quiet weather with unseasonably warm conditions will continue through the upcoming weekend. As was observed the past few mornings, generally clear skies and light/calm winds should promote shallow fog across primarily interior northern Illinois late tonight through sunrise Thursday.

The blocking pattern will slowly break down early next week as the ridge flattens and a southwestern upper-level low begins to meander toward the central CONUS. A series of smaller troughs on the periphery of a developing longwave trough across the north Pacific and western Canada will eventually pick up the southwestern low. Consensus guidance suggests that the influence of the low on our area could occur as early as Monday night, but more likely Tuesday and Wednesday. Cooler and more seasonable conditions would accompany this system.

Kluber

Aviation

Issued at 1217 PM CDT Wed Oct 21 2026

Expect generally VFR conditions with a few mid-level clouds through the period as high pressure drifts over the area. However, as has been observed during the past few mornings, MIFG/BCFG is likely at RFD/DPA and VFR BR is possible at ORD late tonight through sunrise Thursday.

Light SW winds are expected this afternoon, though a weak lake breeze may wash out and turn winds SE 5 knots or less over ORD and especially MDW toward sunset. Winds will become calm or light and VRB tonight into Thursday morning, with a lake- enhanced NE wind shift likely by Thursday afternoon.

Kluber

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.