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DeKalb IL Weather - Clear - 79°F
Clear
79°F
Updated 5:06 pm
Feels Like 82°F
Humidity 49%
Wind S 7 mph
Barometer  29.93 in
Dew Point 59°F
DeKalb IL Weather - Clear - 26°C
Clear
26°C
Updated 5:06 pm
Feels Like 28°C
Humidity 49%
Wind S 11 km/h
Barometer  101.4 kPa
Dew Point 15°C
DeKalb, IL Weather and Current Conditionsdekalb il weather forecast

DeKalb, IL Weather Forecast

DeKalb Illinois WeatherDeKalb, Illinois Weather Weather Forecast
14 day API weather forecast for DeKalb, Illinois. Note: The 7-day weather forecast for DeKalb, IL is the most reliable and accurate weather forecast. This model should only be used as a likely scenario. It is difficult to predict weather more than 7 days ahead.
DeKalb, IL Weather Forecast Dated: 506 PM Fri Sep 11 2026
Expect a mild stretch with a mix of sun and clouds and occasional showers over the coming period. generally humid conditions and no major pressure swings will dominate.

Friday, September 11, 2026

Mid-Morning
DeKalb Weather - 2026-09-11 - Morning - Sunny
65°F 19°C
Sunny
Mid-Afternoon
DeKalb Weather - 2026-09-11 - Afternoon - Sunny
83°F 28°C
Sunny
Early-Evening
DeKalb Weather - 2026-09-11 - Evening - Sunny
73°F 23°C
Sunny
Warm and summery near 83°F 28°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds out of the SSE at 9 mph 15 km/h.

Saturday, September 12, 2026

Mid-Morning
DeKalb Weather - 2026-09-12 - Morning - Sunny
68°F 20°C
Sunny
Mid-Afternoon
DeKalb Weather - 2026-09-12 - Afternoon - Sunny
80°F 27°C
Sunny
Early-Evening
DeKalb Weather - 2026-09-12 - Evening - Sunny
76°F 25°C
Sunny
Balmy with temperatures reaching 80°F 27°C, sunny throughout the day, with steady humidity and steady pressure. Winds switching from the SSW to the SW at 7 mph 11 km/h.

Sunday, September 13, 2026

Mid-Morning
DeKalb Weather - 2026-09-13 - Morning - Overcast
64°F 18°C
Overcast
Mid-Afternoon
DeKalb Weather - 2026-09-13 - Afternoon - Overcast
70°F 21°C
Overcast
Early-Evening
DeKalb Weather - 2026-09-13 - Evening - Overcast
66°F 19°C
Overcast
Enjoyable around 70°F 21°C, overcast throughout the day, with lower humidity and steady pressure. Winds moving from the NE to the ENE at 8 mph 12 km/h.

Monday, September 14, 2026

Mid-Morning
DeKalb Weather - 2026-09-14 - Morning - Light Showers
59°F 15°C
Light Showers
Mid-Afternoon
DeKalb Weather - 2026-09-14 - Afternoon - Overcast
63°F 17°C
Overcast
Early-Evening
DeKalb Weather - 2026-09-14 - Evening - Partly Cloudy
74°F 24°C
Partly Cloudy
Cool with a high near 63°F 17°C, early showers breaking for a drier afternoon, with steady humidity and barometric pressure falling. Winds swinging from the E to the SE at 16 mph 26 km/h. Gusts up to 34 mph 55 km/h.

Tuesday, September 15, 2026

Mid-Morning
DeKalb Weather - 2026-09-15 - Morning - Light Showers
70°F 21°C
Light Showers
Mid-Afternoon
DeKalb Weather - 2026-09-15 - Afternoon - Scattered Showers
76°F 24°C
Scattered Showers
Early-Evening
DeKalb Weather - 2026-09-15 - Evening - Scattered Showers
73°F 23°C
Scattered Showers
Mild with a high of 76°F 24°C, scattered downpours possible, with steady humidity and steady pressure. Winds shifting from the WNW to the NE at 4 mph 5 km/h.

Wednesday, September 16, 2026

Mid-Morning
DeKalb Weather - 2026-09-16 - Morning - Light Showers
65°F 19°C
Light Showers
Mid-Afternoon
DeKalb Weather - 2026-09-16 - Afternoon - Scattered Showers
61°F 16°C
Scattered Showers
Early-Evening
DeKalb Weather - 2026-09-16 - Evening - Light Showers
60°F 16°C
Light Showers
Mildly cool near 61°F 16°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds turning from the ENE to the NE at 11 mph 17 km/h. Gusts up to 23 mph 36 km/h.

Thursday, September 17, 2026

Mid-Morning
DeKalb Weather - 2026-09-17 - Morning - Overcast
56°F 13°C
Overcast
Mid-Afternoon
DeKalb Weather - 2026-09-17 - Afternoon - Overcast
64°F 18°C
Overcast
Early-Evening
DeKalb Weather - 2026-09-17 - Evening - Sunny
59°F 15°C
Sunny
Comfortable at 64°F 18°C, overcast in the morning, partly cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure. Winds switching from the ESE to the WSW at 10 mph 16 km/h.

Friday, September 18, 2026

Mid-Morning
DeKalb Weather - 2026-09-18 - Morning - Sunny
54°F 12°C
Sunny
Mid-Afternoon
DeKalb Weather - 2026-09-18 - Afternoon - Sunny
64°F 18°C
Sunny
Early-Evening
DeKalb Weather - 2026-09-18 - Evening - Sunny
59°F 15°C
Sunny
Cool with a high near 64°F 18°C, sunny throughout the day, with steady humidity and barometric pressure falling.

Saturday, September 19, 2026

Mid-Morning
DeKalb Weather - 2026-09-19 - Morning - Cloudy
56°F 14°C
Cloudy
Mid-Afternoon
DeKalb Weather - 2026-09-19 - Afternoon - Sunny
69°F 20°C
Sunny
Early-Evening
DeKalb Weather - 2026-09-19 - Evening - Sunny
64°F 18°C
Sunny
Mild temperatures up to 69°F 20°C, cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure.

Sunday, September 20, 2026

Mid-Morning
DeKalb Weather - 2026-09-20 - Morning - Sunny
61°F 16°C
Sunny
Mid-Afternoon
DeKalb Weather - 2026-09-20 - Afternoon - Sunny
70°F 21°C
Sunny
Early-Evening
DeKalb Weather - 2026-09-20 - Evening - Sunny
65°F 19°C
Sunny
Mild with a high of 70°F 21°C, sunny throughout the day, with steady humidity and steady pressure.

Monday, September 21, 2026

Mid-Morning
DeKalb Weather - 2026-09-21 - Morning - Sunny
64°F 18°C
Sunny
Mid-Afternoon
DeKalb Weather - 2026-09-21 - Afternoon - Sunny
72°F 22°C
Sunny
Early-Evening
DeKalb Weather - 2026-09-21 - Evening - Partly Cloudy
66°F 19°C
Partly Cloudy
Pleasant near 72°F 22°C, sunny throughout the day, with steady humidity and steady pressure. Winds blowing from the SSE at 9 mph 14 km/h.

Tuesday, September 22, 2026

Mid-Morning
DeKalb Weather - 2026-09-22 - Morning - Sunny
61°F 16°C
Sunny
Mid-Afternoon
DeKalb Weather - 2026-09-22 - Afternoon - Overcast
72°F 22°C
Overcast
Early-Evening
DeKalb Weather - 2026-09-22 - Evening - Overcast
69°F 21°C
Overcast
Comfortable with temperatures reaching 72°F 22°C, cloudy in the morning, becoming overcast through the afternoon and evening, with steady humidity and steady pressure. Winds swinging from the SSE to the SE at 7 mph 11 km/h.

Wednesday, September 23, 2026

Mid-Morning
DeKalb Weather - 2026-09-23 - Morning - Sunny
65°F 18°C
Sunny
Mid-Afternoon
DeKalb Weather - 2026-09-23 - Afternoon - Sunny
75°F 24°C
Sunny
Early-Evening
DeKalb Weather - 2026-09-23 - Evening - Sunny
71°F 22°C
Sunny
Enjoyable around 75°F 24°C, cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure.

Thursday, September 24, 2026

Mid-Morning
DeKalb Weather - 2026-09-24 - Morning - Overcast
67°F 19°C
Overcast
Mid-Afternoon
DeKalb Weather - 2026-09-24 - Afternoon - Scattered Showers
67°F 19°C
Scattered Showers
Early-Evening
DeKalb Weather - 2026-09-24 - Evening - Light Showers
66°F 19°C
Light Showers
Mildly cool near 67°F 19°C, scattered downpours possible, with increasing humidity and steady pressure. Winds shifting from the SE to the ESE at 9 mph 15 km/h.

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Weather by the Numbers

Fri, 11th
DeKalb IL Weather - Friday, Sep 11, 2026 - Sunny
Hi: 83°F 28°C
Lo: 56°F 13°C
Sunrise 06:31 AM
Sunset 07:11 PM
Wind SSE 11 mph17 km/h
Dew Point 63°F17°C
uv Index 6
Barometric Pressure 30 in1016 mb
POP 4% *
Humidity 64%
Sat, 12th
DeKalb IL Weather - Saturday, Sep 12, 2026 - Sunny
Hi: 80°F 27°C
Lo: 64°F 18°C
Sunrise 06:32 AM
Sunset 07:10 PM
Wind SW 12 mph19 km/h
Dew Point 64°F18°C
uv Index 6
Barometric Pressure 29.88 in1012 mb
POP 5% *
Humidity 66%
Sun, 13th
DeKalb IL Weather - Sunday, Sep 13, 2026 - Overcast
Hi: 71°F 22°C
Lo: 61°F 16°C
Sunrise 06:33 AM
Sunset 07:08 PM
Wind NE 9 mph15 km/h
Dew Point 61°F16°C
uv Index 6
Barometric Pressure 30.06 in1018 mb
POP 19% *
Humidity 71%
Mon, 14th
DeKalb IL Weather - Monday, Sep 14, 2026 - Light Rain Shower
Hi: 77°F 25°C
Lo: 59°F 15°C
Sunrise 06:34 AM
Sunset 07:06 PM
Wind E 11 mph17 km/h
Dew Point 57°F14°C
uv Index 2
Barometric Pressure 30.12 in1020 mb
POP 56% *
Humidity 86%
Tue, 15th
DeKalb IL Weather - Tuesday, Sep 15, 2026 - Light Rain Shower
Hi: 80°F 27°C
Lo: 70°F 21°C
Sunrise 06:35 AM
Sunset 07:04 PM
Wind SW 8 mph12 km/h
Dew Point 66°F19°C
uv Index 5
Barometric Pressure 30.03 in1017 mb
POP 38% *
Humidity 81%
Wed, 16th
DeKalb IL Weather - Wednesday, Sep 16, 2026 - Overcast
Hi: 72°F 22°C
Lo: 59°F 15°C
Sunrise 06:36 AM
Sunset 07:03 PM
Wind NNE 10 mph16 km/h
Dew Point 61°F16°C
uv Index 4
Barometric Pressure 30.18 in1022 mb
POP 32% *
Humidity 94%
Thu, 17th
DeKalb IL Weather - Thursday, Sep 17, 2026 - Overcast
Hi: 64°F 18°C
Lo: 52°F 11°C
Sunrise 06:37 AM
Sunset 07:01 PM
Wind WSW 12 mph19 km/h
Dew Point 49°F10°C
uv Index 4
Barometric Pressure 30.27 in1025 mb
POP 16% *
Humidity 64%
Fri, 18th
DeKalb IL Weather - Friday, Sep 18, 2026 - Sunny
Hi: 65°F 18°C
Lo: 48°F 9°C
Sunrise 06:38 AM
Sunset 06:59 PM
Wind WNW 4 mph6 km/h
Dew Point 43°F6°C
uv Index 5
Barometric Pressure 30.27 in1025 mb
POP 2% *
Humidity 51%
Sat, 19th
DeKalb IL Weather - Saturday, Sep 19, 2026 - Partly Cloudy
Hi: 70°F 21°C
Lo: 51°F 10°C
Sunrise 06:39 AM
Sunset 06:57 PM
Wind W 4 mph6 km/h
Dew Point 46°F8°C
uv Index 5
Barometric Pressure 30.18 in1022 mb
POP 3% *
Humidity 52%
Sun, 20th
DeKalb IL Weather - Sunday, Sep 20, 2026 - Sunny
Hi: 71°F 22°C
Lo: 55°F 13°C
Sunrise 06:40 AM
Sunset 06:55 PM
Wind SSW 6 mph9 km/h
Dew Point 51°F10°C
uv Index 5
Barometric Pressure 30.12 in1020 mb
POP 3% *
Humidity 55%
Mon, 21st
DeKalb IL Weather - Monday, Sep 21, 2026 - Sunny
Hi: 73°F 23°C
Lo: 59°F 15°C
Sunrise 06:41 AM
Sunset 06:54 PM
Wind SE 9 mph14 km/h
Dew Point 56°F13°C
uv Index 6
Barometric Pressure 30.06 in1018 mb
POP 4% *
Humidity 62%
Tue, 22nd
DeKalb IL Weather - Tuesday, Sep 22, 2026 - Overcast
Hi: 73°F 23°C
Lo: 56°F 13°C
Sunrise 06:42 AM
Sunset 06:52 PM
Wind S 11 mph18 km/h
Dew Point 54°F12°C
uv Index 5
Barometric Pressure 29.94 in1014 mb
POP 14% *
Humidity 59%
Wed, 23rd
DeKalb IL Weather - Wednesday, Sep 23, 2026 - Overcast
Hi: 76°F 24°C
Lo: 61°F 16°C
Sunrise 06:43 AM
Sunset 06:50 PM
Wind S 6 mph9 km/h
Dew Point 56°F13°C
uv Index 5
Barometric Pressure 29.97 in1015 mb
POP 5% *
Humidity 57%
Thu, 24th
DeKalb IL Weather - Thursday, Sep 24, 2026 - Overcast
Hi: 70°F 21°C
Lo: 63°F 17°C
Sunrise 06:44 AM
Sunset 06:48 PM
Wind ESE 7 mph11 km/h
Dew Point 60°F15°C
uv Index 5
Barometric Pressure 30.15 in1021 mb
POP 18% *
Humidity 71%
* POP = Probability of Precipitation. Data for 12:00 PM.