DeKalb Weather Forecast 15 Days, Weather in DeKalb Today

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5. Weather in DeKalb for 15 days

Current weather conditions and 15 day weather forecast for DeKalb, Illinois, USA including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain risk, wind speed, cloud, pressure, and UV index.

Current weather conditions at DeKalb

25 December 2025 Thursday 4.6 ° C / 40.3°F Overcast

Feels Like : 4.3 ° C / 39.7°F Humidity : % 89 Pressure : 1018 mb Wind Speed : 3.6 kmph / 2.2 miles from SSE Visibility : 16 km Precipitation (rainfall) : 0 mm Cloud (%) : 100

15 day weather forecast for DeKalb, IL, USA

Weather Forecast for next 15 Days for DeKalb including weather warnings, temperature, rain, wind speed, cloud, snow, wind speed and wind direction, pressure and UV index.
Here is weather for the next 15 days in DeKalb, Illinois state, US. To see the daily forecast, scroll to the table below.

Date	Weather forecast	Low temperature	High temperature	Avg. temperature	Humidity	Chance of rain	UV Index	Sun Position	Moon Position
24 December 2025 Wednesday	Patchy rain nearby	-0.2 ° C (31.6°F)	8.5 ° C (47.3°F)	3.6 ° C (38.5°F)	% 84	89%	0.2	Sunrise:07:21 AM Sunset: 04:28 PM	Moonrise:10:27 AM Moonset: 09:09 PM Moon Phase ( Waxing Crescent )
25 December 2025 Thursday	Overcast	0.3 ° C (32.5°F)	4.5 ° C (40.1°F)	2.7 ° C (36.8°F)	% 92	0%	0.3	Sunrise:07:22 AM Sunset: 04:29 PM	Moonrise:10:50 AM Moonset: 10:16 PM Moon Phase ( Waxing Crescent )
26 December 2025 Friday	Fog	0.1 ° C (32.1°F)	1.3 ° C (34.3°F)	0.5 ° C (33°F)	% 97	0%	0.1	Sunrise:07:22 AM Sunset: 04:30 PM	Moonrise:11:11 AM Moonset: 11:26 PM Moon Phase ( Waxing Crescent )
27 December 2025 Saturday	Fog	0.2 ° C (32.4°F)	2.4 ° C (36.3°F)	1.8 ° C (35.2°F)	% 97	0%	0.2	Sunrise:07:22 AM Sunset: 04:30 PM	Moonrise:11:32 AM Moonset: No moonset Moon Phase ( First Quarter )
28 December 2025 Sunday	Moderate rain	-5.3 ° C (22.5°F)	10.6 ° C (51.1°F)	5.5 ° C (42°F)	% 91	89%	0.1	Sunrise:07:22 AM Sunset: 04:31 PM	Moonrise:11:54 AM Moonset: 12:36 AM Moon Phase ( Waxing Gibbous )
29 December 2025 Monday	Light freezing rain	-11.2 ° C (11.9°F)	-6.8 ° C (19.8°F)	-8.9 ° C (15.9°F)	% 64	69%	0	Sunrise:07:23 AM Sunset: 04:32 PM	Moonrise:12:20 PM Moonset: 01:51 AM Moon Phase ( Waxing Gibbous )
30 December 2025 Tuesday	Sunny	-10.5 ° C (13.1°F)	-3.5 ° C (25.6°F)	-7 ° C (19.5°F)	% 51	0%	2	Sunrise:07:23 AM Sunset: 04:33 PM	Moonrise:12:53 PM Moonset: 03:09 AM Moon Phase ( Waxing Gibbous )
31 December 2025 Wednesday	Sunny	-4.6 ° C (23.8°F)	1.7 ° C (35°F)	-1.8 ° C (28.8°F)	% 73	0%	2	Sunrise:07:23 AM Sunset: 04:34 PM	Moonrise:01:35 PM Moonset: 04:30 AM Moon Phase ( Waxing Gibbous )
01 January 2026 Thursday	Sunny	-1.6 ° C (29.2°F)	4.8 ° C (40.7°F)	0.8 ° C (33.5°F)	% 79	0%	2	Sunrise:07:23 AM Sunset: 04:34 PM	Moonrise:02:28 PM Moonset: 05:50 AM Moon Phase ( Waxing Gibbous )
02 January 2026 Friday	Patchy rain nearby	1.2 ° C (34.1°F)	7.9 ° C (46.2°F)	5 ° C (41.1°F)	% 86	65%	2	Sunrise:07:23 AM Sunset: 04:35 PM	Moonrise:03:36 PM Moonset: 07:00 AM Moon Phase ( Waxing Gibbous )
03 January 2026 Saturday	Cloudy	4.4 ° C (39.9°F)	13.9 ° C (57°F)	9.9 ° C (49.9°F)	% 79	0%	2	Sunrise:07:23 AM Sunset: 04:36 PM	Moonrise:04:52 PM Moonset: 07:58 AM Moon Phase ( Full Moon )
04 January 2026 Sunday	Sunny	-4 ° C (24.9°F)	-1 ° C (30.2°F)	-1.8 ° C (28.7°F)	% 49	0%	2	Sunrise:07:23 AM Sunset: 04:37 PM	Moonrise:06:12 PM Moonset: 08:42 AM Moon Phase ( Waning Gibbous )
05 January 2026 Monday	Overcast	-4.8 ° C (23.4°F)	-1.8 ° C (28.7°F)	-3.8 ° C (25.2°F)	% 45	0%	1	Sunrise:07:23 AM Sunset: 04:38 PM	Moonrise:07:30 PM Moonset: 09:16 AM Moon Phase ( Waning Gibbous )
06 January 2026 Tuesday	Sunny	-5.1 ° C (22.9°F)	2 ° C (35.5°F)	-2.4 ° C (27.6°F)	% 63	0%	2	Sunrise:07:23 AM Sunset: 04:39 PM	Moonrise:08:43 PM Moonset: 09:43 AM Moon Phase ( Waning Gibbous )

DeKalb Weather forecasts are usually fully updated every 4 hours.

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