Dekalb, IL 60115 Weather

DeKalb County2:33 PM CDT41.90°N, 88.75°W

Current conditions

Sunny
68°
Sunny
Feels like 68°
High 69°·Low 42°
WindSE 5 mph
Humidity41%
Dew point44°
Cloud cover1%
UV index3 Moderate
Sunrise7:14 AM
Sunset6:07 PM

Forecast for this hour (no station report in the last two hours)

Forecast

10-day

  • This Afternoon

    Sunny. High near 69, with temperatures falling to around 66 in the afternoon. East southeast wind around 5 mph.

  • Tonight

    Mostly clear, with a low around 42. Southeast wind 0 to 5 mph.

  • Wednesday

    Sunny. High near 72, with temperatures falling to around 69 in the afternoon. South southwest wind 0 to 5 mph.

National Weather Service forecast updated 4 hrs ago.

Hourly

Hourly forecast
  1. Now Sunny 68°
  2. 3 PM Sunny 69°
  3. 4 PM Sunny 69°
  4. 5 PM Sunny 66°
  5. 6 PM Clear 62°
  6. 7 PM Clear 58°
  7. 8 PM Clear 54°
  8. 9 PM Clear 52°
  9. 10 PM Mostly Clear 50°
  10. 11 PM Mostly Clear 49°
  11. Wed12 AM Clear 48°
  12. 1 AM Mostly Clear 47°
  13. 2 AM Mostly Clear 46°
  14. 3 AM Mostly Clear 45°
  15. 4 AM Mostly Clear 44°
  16. 5 AM Mostly Clear 43°
  17. 6 AM Sunny 43°
  18. 7 AM Sunny 42°
  19. 8 AM Sunny 44°
  20. 9 AM Sunny 51°
  21. 10 AM Sunny 57°
  22. 11 AM Sunny 63°
  23. 12 PM Sunny 66°
  24. 1 PM Sunny 69°

10-day forecast

Details
  1. TodayOct 20 Sunny Sunny42°69°
  2. WedOct 21 Sunny Sunny46°72°
  3. ThuOct 22 Sunny Sunny47°72°
  4. FriOct 23 Sunny Sunny47°69°
  5. SatOct 24 Mostly Sunny Mostly Sunny51°69°
  6. SunOct 25 Partly Sunny Partly Sunny48°71°
  7. MonOct 26 Partly Sunny Partly Sunny15%44°66°
  8. TueOct 27 Cloudy Cloudy43°56°
  9. WedOct 28 Cloudy Cloudy43°51°
  10. ThuOct 29 Sunny Sunny40°54°

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 DeKalb

More weather news

Air quality

57
Moderate
Fine particles (PM2.5)

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

Forecast

  • TueModerate
  • WedModerate
  • ThuModerate

Aurora and Elgin, 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 7:14 AM
Sunset 6:07 PM
Daylight 10 h 53 min (−2 min 41 s tomorrow)
Waxing Gibbous · 71% lit
Moonrise 3:27 PM Moonset 1:07 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low61° / 38°
Record high76° (1965)
Record low20° (1972)
Wettest1.50 in (1916)
Month to date2.06 in (normal 1.86 in)

Paw Paw 2s, records since 1935. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in LOT, issued 8 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 620 AM CDT Tue Oct 20 2026

Key Aviation Messages for the current TAF period:

- Patchy fog, locally dense, expected through sunrise today for Chicago terminals north of a KARR to KMDW line

- Another chance for fog tomorrow morning for terminals closer to the lake

A locally dense fog bank is slowly moving west-southwest through northeastern Illinois this morning. The densest portion of this fog dropped visibilities at KORD down to 1/8SM. This fog is expected to impact terminals north of a KARR to KMDW line. Some MVFR vis may develop south of this border, but there is lower confidence in dense fog currently. Once the sun rises, visibilities are expected to improve back to VFR conditions.

Winds are expected to be light and mostly out of the east- southeast today. Clear skies are expected tonight with light, if not calm, winds across the area leading to another chance for fog developing closer to the lake, similar to what is happening this morning. A TEMPO was added for tomorrow morning introducing reduced vis which can be adjusted in later TAF packages with updated confidence in fog development.

Lot Watches

IL...Dense Fog Advisory until 9 AM CDT this morning for ILZ005- ILZ006-ILZ013-ILZ103-ILZ104.

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.