Frederick Weather Forecast 15 Days, Weather in Frederick Today
Current weather conditions and 15 day weather forecast for Frederick, 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 Frederick
| 19 September 2026 Saturday 26.5 ° C / 79.7°F  Overcast |
Feels Like : 28.3 ° C / 82.9°F Humidity : % 70 Pressure : 1013 mb Wind Speed : 7.2 kmph / 4.5 miles from SE  Visibility : 10 km Precipitation (rainfall) : 0 mm Cloud (%) : 100 |
15 day weather forecast for Frederick, IL, USA
Weather Forecast for next 15 Days for Frederick 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 Frederick, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 19 September 2026 Saturday | Overcast |
21.9 ° C (71.4°F) |
27.2 ° C (81°F) |
24.9 ° C (76.9°F) |
% 80 | 75% | 2.7 | Sunrise:06:46 AM Sunset: 07:04 PM |
Moonrise:03:43 PM Moonset: Does not set today Moon Phase ( First Quarter ) |
|
| 20 September 2026 Sunday | Overcast |
17.6 ° C (63.7°F) |
27.5 ° C (81.6°F) |
23.5 ° C (74.3°F) |
% 75 | 19% | 6.4 | Sunrise:06:47 AM Sunset: 07:02 PM |
Moonrise:04:21 PM Moonset: 12:44 AM Moon Phase ( Waxing Gibbous ) |
|
| 21 September 2026 Monday | Overcast |
15.4 ° C (59.7°F) |
17.1 ° C (62.8°F) |
16.3 ° C (61.4°F) |
% 89 | 88% | 0.9 | Sunrise:06:48 AM Sunset: 07:01 PM |
Moonrise:04:51 PM Moonset: 01:45 AM Moon Phase ( Waxing Gibbous ) |
|
| 22 September 2026 Tuesday | Overcast |
14.1 ° C (57.4°F) |
15.6 ° C (60.1°F) |
14.8 ° C (58.7°F) |
% 79 | 55% | 1.1 | Sunrise:06:49 AM Sunset: 06:59 PM |
Moonrise:05:17 PM Moonset: 02:48 AM Moon Phase ( Waxing Gibbous ) |
|
| 23 September 2026 Wednesday |  Sunny |
12.5 ° C (54.4°F) |
22 ° C (71.6°F) |
16.7 ° C (62°F) |
% 65 | 7% | 6.1 | Sunrise:06:50 AM Sunset: 06:57 PM |
Moonrise:05:40 PM Moonset: 03:49 AM Moon Phase ( Waxing Gibbous ) |
|
| 24 September 2026 Thursday |  Partly Cloudy |
12.7 ° C (54.8°F) |
22.4 ° C (72.3°F) |
17.3 ° C (63.1°F) |
% 75 | 14% | 6 | Sunrise:06:51 AM Sunset: 06:56 PM |
Moonrise:06:01 PM Moonset: 04:51 AM Moon Phase ( Full Moon ) |
|
| 25 September 2026 Friday |  Patchy rain nearby |
11.5 ° C (52.7°F) |
16.7 ° C (62.1°F) |
14.7 ° C (58.4°F) |
% 88 | 86% | 4 | Sunrise:06:52 AM Sunset: 06:54 PM |
Moonrise:06:22 PM Moonset: 05:52 AM Moon Phase ( Full Moon ) |
|
| 26 September 2026 Saturday |  Light rain shower |
10.6 ° C (51.1°F) |
22.6 ° C (72.7°F) |
16.4 ° C (61.5°F) |
% 70 | 74% | 6 | Sunrise:06:53 AM Sunset: 06:52 PM |
Moonrise:06:42 PM Moonset: 06:53 AM Moon Phase ( Full Moon ) |
|
| 27 September 2026 Sunday | Sunny |
10.7 ° C (51.2°F) |
21.3 ° C (70.4°F) |
16.8 ° C (62.2°F) |
% 64 | 6% | 6 | Sunrise:06:54 AM Sunset: 06:51 PM |
Moonrise:07:05 PM Moonset: 07:56 AM Moon Phase ( Waning Gibbous ) |
|
| 28 September 2026 Monday | Overcast |
16.9 ° C (62.4°F) |
22.8 ° C (73.1°F) |
19.1 ° C (66.4°F) |
% 64 | 17% | 5 | Sunrise:06:55 AM Sunset: 06:49 PM |
Moonrise:07:30 PM Moonset: 09:02 AM Moon Phase ( Waning Gibbous ) |
|
| 29 September 2026 Tuesday | Overcast |
15.2 ° C (59.4°F) |
21.8 ° C (71.2°F) |
18.1 ° C (64.6°F) |
% 76 | 48% | 5 | Sunrise:06:56 AM Sunset: 06:47 PM |
Moonrise:08:01 PM Moonset: 10:10 AM Moon Phase ( Waning Gibbous ) |
|
| 30 September 2026 Wednesday | Patchy rain nearby |
13.5 ° C (56.2°F) |
19.5 ° C (67.1°F) |
15.8 ° C (60.5°F) |
% 83 | 28% | 4 | Sunrise:06:57 AM Sunset: 06:46 PM |
Moonrise:08:39 PM Moonset: 11:19 AM Moon Phase ( Waning Gibbous ) |
|
| 01 October 2026 Thursday | Overcast |
11.6 ° C (52.8°F) |
20.3 ° C (68.5°F) |
15.7 ° C (60.3°F) |
% 73 | 17% | 5 | Sunrise:06:58 AM Sunset: 06:44 PM |
Moonrise:09:26 PM Moonset: 12:29 PM Moon Phase ( Last Quarter ) |
|
| 02 October 2026 Friday | Overcast |
13.1 ° C (55.6°F) |
20.3 ° C (68.5°F) |
15.9 ° C (60.7°F) |
% 79 | 30% | 5 | Sunrise:06:59 AM Sunset: 06:42 PM |
Moonrise:10:24 PM Moonset: 01:33 PM Moon Phase ( Last Quarter ) |
|
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