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
| 08 May 2026 Friday 7.5 ° C / 45.5°F  Overcast |
Feels Like : 5.4 ° C / 41.8°F Humidity : % 59 Pressure : 1012 mb Wind Speed : 11.2 kmph / 6.9 miles from SSE  Visibility : 16 km Precipitation (rainfall) : 0 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 08 May 2026 Friday |  Patchy rain nearby |
5.2 ° C (41.4°F) |
24.3 ° C (75.7°F) |
13.8 ° C (56.9°F) |
% 46 | 85% | 5.6 | Sunrise:05:46 AM Sunset: 08:06 PM |
Moonrise:01:37 AM Moonset: 10:57 AM Moon Phase ( Waning Gibbous ) |
|
| 09 May 2026 Saturday | Patchy rain nearby |
8.2 ° C (46.8°F) |
19.4 ° C (66.9°F) |
13.1 ° C (55.5°F) |
% 71 | 89% | 6.4 | Sunrise:05:45 AM Sunset: 08:07 PM |
Moonrise:02:05 AM Moonset: 12:03 PM Moon Phase ( Last Quarter ) |
|
| 10 May 2026 Sunday |  Partly Cloudy |
5.5 ° C (41.9°F) |
15.3 ° C (59.5°F) |
10.4 ° C (50.8°F) |
% 59 | 0% | 7 | Sunrise:05:44 AM Sunset: 08:08 PM |
Moonrise:02:30 AM Moonset: 01:11 PM Moon Phase ( Waning Crescent ) |
|
| 11 May 2026 Monday |  Sunny |
4.1 ° C (39.4°F) |
15.9 ° C (60.7°F) |
10.5 ° C (51°F) |
% 59 | 0% | 7.2 | Sunrise:05:43 AM Sunset: 08:09 PM |
Moonrise:02:52 AM Moonset: 02:19 PM Moon Phase ( Waning Crescent ) |
|
| 12 May 2026 Tuesday |  Moderate rain |
7.7 ° C (45.8°F) |
19.3 ° C (66.7°F) |
10.9 ° C (51.6°F) |
% 78 | 88% | 0 | Sunrise:05:42 AM Sunset: 08:10 PM |
Moonrise:03:13 AM Moonset: 03:29 PM Moon Phase ( Waning Crescent ) |
|
| 13 May 2026 Wednesday | Overcast |
6.8 ° C (44.2°F) |
9.3 ° C (48.7°F) |
9.1 ° C (48.4°F) |
% 79 | 0% | 2 | Sunrise:05:41 AM Sunset: 08:12 PM |
Moonrise:03:35 AM Moonset: 04:42 PM Moon Phase ( Waning Crescent ) |
|
| 14 May 2026 Thursday | Sunny |
4.7 ° C (40.4°F) |
18.4 ° C (65°F) |
11.8 ° C (53.2°F) |
% 68 | 0% | 4 | Sunrise:05:40 AM Sunset: 08:13 PM |
Moonrise:03:58 AM Moonset: 05:59 PM Moon Phase ( Waning Crescent ) |
|
| 15 May 2026 Friday | Partly Cloudy |
11 ° C (51.8°F) |
24 ° C (75.2°F) |
16.5 ° C (61.8°F) |
% 75 | 0% | 5 | Sunrise:05:39 AM Sunset: 08:14 PM |
Moonrise:04:25 AM Moonset: 07:21 PM Moon Phase ( Waning Crescent ) |
|
| 16 May 2026 Saturday | Patchy rain nearby |
10.2 ° C (50.4°F) |
19.6 ° C (67.3°F) |
15.1 ° C (59.1°F) |
% 76 | 63% | 4 | Sunrise:05:38 AM Sunset: 08:15 PM |
Moonrise:05:00 AM Moonset: 08:44 PM Moon Phase ( New Moon ) |
|
| 17 May 2026 Sunday | Patchy rain nearby |
18.2 ° C (64.8°F) |
23.3 ° C (74°F) |
20 ° C (67.9°F) |
% 90 | 89% | 4 | Sunrise:05:37 AM Sunset: 08:16 PM |
Moonrise:05:44 AM Moonset: 10:03 PM Moon Phase ( Waxing Crescent ) |
|
| 18 May 2026 Monday | Overcast |
14.4 ° C (57.9°F) |
21.4 ° C (70.4°F) |
18.2 ° C (64.8°F) |
% 88 | 0% | 4 | Sunrise:05:36 AM Sunset: 08:17 PM |
Moonrise:06:40 AM Moonset: 11:12 PM Moon Phase ( Waxing Crescent ) |
|
| 19 May 2026 Tuesday | Sunny |
12.1 ° C (53.8°F) |
22.8 ° C (73.1°F) |
16.7 ° C (62.1°F) |
% 69 | 0% | 5 | Sunrise:05:35 AM Sunset: 08:18 PM |
Moonrise:07:50 AM Moonset: No moonset Moon Phase ( Waxing Crescent ) |
|
| 20 May 2026 Wednesday | Patchy rain nearby |
11.4 ° C (52.5°F) |
20.6 ° C (69°F) |
16.2 ° C (61.1°F) |
% 68 | 79% | 4 | Sunrise:05:34 AM Sunset: 08:19 PM |
Moonrise:09:07 AM Moonset: 12:07 AM Moon Phase ( Waxing Crescent ) |
|
| 21 May 2026 Thursday | Patchy rain nearby |
15.8 ° C (60.4°F) |
21.5 ° C (70.8°F) |
18.3 ° C (64.9°F) |
% 85 | 83% | 4 | Sunrise:05:33 AM Sunset: 08:19 PM |
Moonrise:10:25 AM Moonset: 12:49 AM Moon Phase ( Waxing Crescent ) |
|
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