Ottawa Weather Forecast 15 Days, Weather in Ottawa Today
Current weather conditions and 15 day weather forecast for Ottawa, 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 Ottawa
| 26 December 2025 Friday 8 ° C / 46.4°F  Overcast |
Feels Like : 4.8 ° C / 40.6°F Humidity : % 100 Pressure : 1008 mb Wind Speed : 20.5 kmph / 12.8 miles from WNW  Visibility : 11 km Precipitation (rainfall) : 0 mm Cloud (%) : 100 |
15 day weather forecast for Ottawa, IL, USA
Weather Forecast for next 15 Days for Ottawa 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 Ottawa, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 26 December 2025 Friday |  Patchy rain nearby |
4.2 ° C (39.6°F) |
12.2 ° C (54°F) |
8.3 ° C (46.9°F) |
% 90 | 81% | 0.2 | Sunrise:07:20 AM Sunset: 04:32 PM |
Moonrise:11:11 AM Moonset: 11:26 PM Moon Phase ( Waxing Crescent ) |
|
| 27 December 2025 Saturday | Overcast |
2.9 ° C (37.2°F) |
5.7 ° C (42.2°F) |
4.2 ° C (39.6°F) |
% 97 | 0% | 0.3 | Sunrise:07:21 AM Sunset: 04:33 PM |
Moonrise:11:33 AM Moonset: No moonset Moon Phase ( First Quarter ) |
|
| 28 December 2025 Sunday |  Moderate rain |
1 ° C (33.8°F) |
10 ° C (50°F) |
6.4 ° C (43.5°F) |
% 94 | 86% | 0 | Sunrise:07:21 AM Sunset: 04:34 PM |
Moonrise:11:56 AM Moonset: 12:36 AM Moon Phase ( Waxing Gibbous ) |
|
| 29 December 2025 Monday |  Light freezing rain |
-8.3 ° C (17.1°F) |
-4.8 ° C (23.4°F) |
-6 ° C (21.3°F) |
% 61 | 82% | 0.2 | Sunrise:07:21 AM Sunset: 04:34 PM |
Moonrise:12:22 PM Moonset: 01:50 AM Moon Phase ( Waxing Gibbous ) |
|
| 30 December 2025 Tuesday |  Partly Cloudy |
-8.8 ° C (16.2°F) |
-0.8 ° C (30.5°F) |
-6.3 ° C (20.7°F) |
% 57 | 0% | 0 | Sunrise:07:21 AM Sunset: 04:35 PM |
Moonrise:12:55 PM Moonset: 03:08 AM Moon Phase ( Waxing Gibbous ) |
|
| 31 December 2025 Wednesday | Partly Cloudy |
-2.9 ° C (26.7°F) |
4.2 ° C (39.5°F) |
-0.1 ° C (31.8°F) |
% 70 | 0% | 2 | Sunrise:07:22 AM Sunset: 04:36 PM |
Moonrise:01:37 PM Moonset: 04:28 AM Moon Phase ( Waxing Gibbous ) |
|
| 01 January 2026 Thursday | Overcast |
-2 ° C (28.3°F) |
4 ° C (39.2°F) |
1.3 ° C (34.4°F) |
% 78 | 0% | 1 | Sunrise:07:22 AM Sunset: 04:37 PM |
Moonrise:02:31 PM Moonset: 05:48 AM Moon Phase ( Waxing Gibbous ) |
|
| 02 January 2026 Friday |  Sunny |
-6.8 ° C (19.7°F) |
-4.2 ° C (24.4°F) |
-5.3 ° C (22.4°F) |
% 45 | 0% | 2 | Sunrise:07:22 AM Sunset: 04:38 PM |
Moonrise:03:39 PM Moonset: 06:58 AM Moon Phase ( Waxing Gibbous ) |
|
| 03 January 2026 Saturday | Light freezing rain |
-6.2 ° C (20.9°F) |
-0.4 ° C (31.2°F) |
-3.4 ° C (25.9°F) |
% 37 | 83% | 1 | Sunrise:07:22 AM Sunset: 04:39 PM |
Moonrise:04:55 PM Moonset: 07:56 AM Moon Phase ( Full Moon ) |
|
| 04 January 2026 Sunday |  Mist |
-1.8 ° C (28.7°F) |
1.4 ° C (34.5°F) |
-0.4 ° C (31.2°F) |
% 94 | 89% | 1 | Sunrise:07:22 AM Sunset: 04:39 PM |
Moonrise:06:14 PM Moonset: 08:40 AM Moon Phase ( Waning Gibbous ) |
|
| 05 January 2026 Monday | Partly Cloudy |
-6.6 ° C (20.1°F) |
-4.1 ° C (24.7°F) |
-4.9 ° C (23.3°F) |
% 75 | 0% | 2 | Sunrise:07:22 AM Sunset: 04:40 PM |
Moonrise:07:32 PM Moonset: 09:15 AM Moon Phase ( Waning Gibbous ) |
|
| 06 January 2026 Tuesday | Light freezing rain |
-6 ° C (21.2°F) |
-3 ° C (26.5°F) |
-5 ° C (23°F) |
% 88 | 72% | 1 | Sunrise:07:22 AM Sunset: 04:41 PM |
Moonrise:08:44 PM Moonset: 09:43 AM Moon Phase ( Waning Gibbous ) |
|
| 07 January 2026 Wednesday | Partly Cloudy |
-9.6 ° C (14.7°F) |
-2.3 ° C (27.8°F) |
-6.2 ° C (20.8°F) |
% 83 | 0% | 2 | Sunrise:07:22 AM Sunset: 04:42 PM |
Moonrise:09:52 PM Moonset: 10:05 AM Moon Phase ( Waning Gibbous ) |
|
| 08 January 2026 Thursday |  Heavy snow |
-5.4 ° C (22.3°F) |
-2.6 ° C (27.4°F) |
-3.7 ° C (25.4°F) |
% 89 | 65% | 1 | Sunrise:07:21 AM Sunset: 04:43 PM |
Moonrise:10:57 PM Moonset: 10:26 AM Moon Phase ( Waning Gibbous ) |
|
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