Denison Weather Forecast 15 Days, Weather in Denison Today
Current weather conditions and 15 day weather forecast for Denison, 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 Denison
| 25 September 2026 Friday 16.6 ° C / 61.8°F  Sunny |
Feels Like : 14.4 ° C / 57.9°F Humidity : % 66 Pressure : 1025 mb Wind Speed : 11.9 kmph / 7.4 miles from ENE  Visibility : 10 km Precipitation (rainfall) : 0 mm Cloud (%) : 8 |
15 day weather forecast for Denison, IL, USA
Weather Forecast for next 15 Days for Denison 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 Denison, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 25 September 2026 Friday |  Partly Cloudy |
13.8 ° C (56.8°F) |
23.5 ° C (74.4°F) |
18.4 ° C (65.1°F) |
% 60 | 6% | 6.3 | Sunrise:06:41 AM Sunset: 06:43 PM |
Moonrise:06:11 PM Moonset: 05:41 AM Moon Phase ( Full Moon ) |
|
| 26 September 2026 Saturday |  Overcast |
14.1 ° C (57.3°F) |
24.9 ° C (76.8°F) |
18.8 ° C (65.8°F) |
% 48 | 8% | 6.3 | Sunrise:06:42 AM Sunset: 06:42 PM |
Moonrise:06:32 PM Moonset: 06:41 AM Moon Phase ( Full Moon ) |
|
| 27 September 2026 Sunday | Overcast |
12.8 ° C (55°F) |
24.6 ° C (76.2°F) |
17.8 ° C (64.1°F) |
% 53 | 9% | 4.9 | Sunrise:06:43 AM Sunset: 06:40 PM |
Moonrise:06:56 PM Moonset: 07:43 AM Moon Phase ( Waning Gibbous ) |
|
| 28 September 2026 Monday | Sunny |
12.2 ° C (54°F) |
26.2 ° C (79.2°F) |
18.6 ° C (65.5°F) |
% 54 | 4% | 6.1 | Sunrise:06:44 AM Sunset: 06:38 PM |
Moonrise:07:22 PM Moonset: 08:48 AM Moon Phase ( Waning Gibbous ) |
|
| 29 September 2026 Tuesday | Partly Cloudy |
13.8 ° C (56.8°F) |
28 ° C (82.4°F) |
20.6 ° C (69.1°F) |
% 47 | 4% | 7 | Sunrise:06:45 AM Sunset: 06:37 PM |
Moonrise:07:54 PM Moonset: 09:55 AM Moon Phase ( Waning Gibbous ) |
|
| 30 September 2026 Wednesday | Overcast |
19.3 ° C (66.8°F) |
28.7 ° C (83.6°F) |
22.9 ° C (73.2°F) |
% 50 | 57% | 6 | Sunrise:06:45 AM Sunset: 06:35 PM |
Moonrise:08:33 PM Moonset: 11:03 AM Moon Phase ( Waning Gibbous ) |
|
| 01 October 2026 Thursday |  Light rain shower |
19.3 ° C (66.8°F) |
25.5 ° C (78°F) |
21.7 ° C (71.1°F) |
% 77 | 83% | 5 | Sunrise:06:46 AM Sunset: 06:34 PM |
Moonrise:09:21 PM Moonset: 12:12 PM Moon Phase ( Last Quarter ) |
|
| 02 October 2026 Friday |  Patchy rain nearby |
19.6 ° C (67.3°F) |
25.5 ° C (77.9°F) |
22.5 ° C (72.4°F) |
% 83 | 49% | 6 | Sunrise:06:47 AM Sunset: 06:32 PM |
Moonrise:10:19 PM Moonset: 01:16 PM Moon Phase ( Last Quarter ) |
|
| 03 October 2026 Saturday |  Fog |
20.4 ° C (68.8°F) |
30.4 ° C (86.7°F) |
25.3 ° C (77.6°F) |
% 74 | 13% | 8 | Sunrise:06:48 AM Sunset: 06:31 PM |
Moonrise:11:26 PM Moonset: 02:13 PM Moon Phase ( Last Quarter ) |
|
| 04 October 2026 Sunday | Patchy rain nearby |
23.3 ° C (73.9°F) |
30.8 ° C (87.4°F) |
26.1 ° C (78.9°F) |
% 74 | 73% | 7 | Sunrise:06:49 AM Sunset: 06:29 PM |
Moonrise:Does not rise today Moonset: 03:01 PM Moon Phase ( Last Quarter ) |
|
| 05 October 2026 Monday | Patchy rain nearby |
9.4 ° C (48.9°F) |
22.7 ° C (72.9°F) |
16 ° C (60.8°F) |
% 82 | 83% | 5 | Sunrise:06:50 AM Sunset: 06:28 PM |
Moonrise:12:40 AM Moonset: 03:41 PM Moon Phase ( Waning Crescent ) |
|
| 06 October 2026 Tuesday | Sunny |
5.2 ° C (41.4°F) |
14.2 ° C (57.6°F) |
9.6 ° C (49.2°F) |
% 51 | 2% | 4 | Sunrise:06:51 AM Sunset: 06:26 PM |
Moonrise:01:56 AM Moonset: 04:15 PM Moon Phase ( Waning Crescent ) |
|
| 07 October 2026 Wednesday | Sunny |
5.3 ° C (41.6°F) |
17.8 ° C (64°F) |
11.2 ° C (52.2°F) |
% 46 | 3% | 5 | Sunrise:06:52 AM Sunset: 06:24 PM |
Moonrise:03:11 AM Moonset: 04:44 PM Moon Phase ( Waning Crescent ) |
|
| 08 October 2026 Thursday | Overcast |
7.4 ° C (45.3°F) |
17.6 ° C (63.7°F) |
12.8 ° C (55°F) |
% 56 | 9% | 5 | Sunrise:06:53 AM Sunset: 06:23 PM |
Moonrise:04:25 AM Moonset: 05:11 PM Moon Phase ( Waning Crescent ) |
|
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