Jefferson Weather Forecast 15 Days, Weather in Jefferson Today
Current weather conditions and 15 day weather forecast for Jefferson, 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 Jefferson
| 20 September 2026 Sunday 14.3 ° C / 57.8°F  Patchy rain nearby |
Feels Like : 9.8 ° C / 49.6°F Humidity : % 92 Pressure : 1016 mb Wind Speed : 28.4 kmph / 17.7 miles from NE  Visibility : 10 km Precipitation (rainfall) : 0.04 mm Cloud (%) : 100 |
15 day weather forecast for Jefferson, IL, USA
Weather Forecast for next 15 Days for Jefferson 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 Jefferson, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 20 September 2026 Sunday |  Light rain shower |
13.7 ° C (56.6°F) |
20.6 ° C (69°F) |
15.6 ° C (60.2°F) |
% 94 | 93% | 0.7 | Sunrise:06:45 AM Sunset: 07:01 PM |
Moonrise:04:26 PM Moonset: 12:33 AM Moon Phase ( Waxing Gibbous ) |
|
| 21 September 2026 Monday |  Overcast |
10.5 ° C (50.9°F) |
13.8 ° C (56.8°F) |
12.7 ° C (54.8°F) |
% 86 | 81% | 0.5 | Sunrise:06:46 AM Sunset: 06:59 PM |
Moonrise:04:55 PM Moonset: 01:36 AM Moon Phase ( Waxing Gibbous ) |
|
| 22 September 2026 Tuesday | Light rain shower |
10.1 ° C (50.2°F) |
15.2 ° C (59.4°F) |
12 ° C (53.6°F) |
% 80 | 68% | 3.2 | Sunrise:06:47 AM Sunset: 06:57 PM |
Moonrise:05:20 PM Moonset: 02:40 AM Moon Phase ( Waxing Gibbous ) |
|
| 23 September 2026 Wednesday |  Sunny |
8.9 ° C (48.1°F) |
18.6 ° C (65.6°F) |
13.1 ° C (55.5°F) |
% 83 | 30% | 5.7 | Sunrise:06:48 AM Sunset: 06:55 PM |
Moonrise:05:41 PM Moonset: 03:43 AM Moon Phase ( Waxing Gibbous ) |
|
| 24 September 2026 Thursday | Overcast |
10.9 ° C (51.6°F) |
18.2 ° C (64.7°F) |
14.1 ° C (57.3°F) |
% 81 | 23% | 5.3 | Sunrise:06:49 AM Sunset: 06:54 PM |
Moonrise:06:01 PM Moonset: 04:46 AM Moon Phase ( Full Moon ) |
|
| 25 September 2026 Friday | Overcast |
13.1 ° C (55.5°F) |
15.4 ° C (59.8°F) |
14.1 ° C (57.4°F) |
% 76 | 22% | 4 | Sunrise:06:50 AM Sunset: 06:52 PM |
Moonrise:06:19 PM Moonset: 05:49 AM Moon Phase ( Full Moon ) |
|
| 26 September 2026 Saturday | Overcast |
13.1 ° C (55.7°F) |
15 ° C (59°F) |
13.9 ° C (57°F) |
% 75 | 27% | 3 | Sunrise:06:51 AM Sunset: 06:50 PM |
Moonrise:06:39 PM Moonset: 06:52 AM Moon Phase ( Full Moon ) |
|
| 27 September 2026 Sunday | Sunny |
13.5 ° C (56.3°F) |
20.2 ° C (68.4°F) |
16.2 ° C (61.1°F) |
% 62 | 6% | 6 | Sunrise:06:52 AM Sunset: 06:48 PM |
Moonrise:06:59 PM Moonset: 07:57 AM Moon Phase ( Waning Gibbous ) |
|
| 28 September 2026 Monday | Sunny |
12.6 ° C (54.6°F) |
20.6 ° C (69.1°F) |
16.3 ° C (61.3°F) |
% 75 | 7% | 6 | Sunrise:06:53 AM Sunset: 06:47 PM |
Moonrise:07:23 PM Moonset: 09:04 AM Moon Phase ( Waning Gibbous ) |
|
| 29 September 2026 Tuesday | Overcast |
12.7 ° C (54.8°F) |
20.4 ° C (68.7°F) |
16.5 ° C (61.6°F) |
% 80 | 17% | 5 | Sunrise:06:54 AM Sunset: 06:45 PM |
Moonrise:07:52 PM Moonset: 10:14 AM Moon Phase ( Waning Gibbous ) |
|
| 30 September 2026 Wednesday | Patchy rain nearby |
10.1 ° C (50.2°F) |
18.4 ° C (65.1°F) |
15.3 ° C (59.6°F) |
% 85 | 87% | 4 | Sunrise:06:55 AM Sunset: 06:43 PM |
Moonrise:08:28 PM Moonset: 11:25 AM Moon Phase ( Waning Gibbous ) |
|
| 01 October 2026 Thursday | Patchy rain nearby |
4.7 ° C (40.5°F) |
9.7 ° C (49.5°F) |
6.5 ° C (43.7°F) |
% 86 | 76% | 2 | Sunrise:06:56 AM Sunset: 06:41 PM |
Moonrise:09:15 PM Moonset: 12:35 PM Moon Phase ( Last Quarter ) |
|
| 02 October 2026 Friday | Overcast |
5.4 ° C (41.7°F) |
12.2 ° C (54°F) |
8.4 ° C (47.2°F) |
% 73 | 20% | 3 | Sunrise:06:57 AM Sunset: 06:40 PM |
Moonrise:10:13 PM Moonset: 01:41 PM Moon Phase ( Last Quarter ) |
|
| 03 October 2026 Saturday |  Partly Cloudy |
6.6 ° C (43.9°F) |
14.8 ° C (58.6°F) |
10.3 ° C (50.5°F) |
% 80 | 81% | 4 | Sunrise:06:58 AM Sunset: 06:38 PM |
Moonrise:11:21 PM Moonset: 02:37 PM Moon Phase ( Last Quarter ) |
|
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