Flat Branch Weather Forecast 15 Days, Weather in Flat Branch Today
Current weather conditions and 15 day weather forecast for Flat Branch, 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 Flat Branch
| 19 September 2026 Saturday 27.1 ° C / 80.8°F  Sunny |
Feels Like : 28.3 ° C / 82.9°F Humidity : % 61 Pressure : 1014 mb Wind Speed : 13.3 kmph / 8.3 miles from WSW  Visibility : 10 km Precipitation (rainfall) : 0 mm Cloud (%) : 5 |
15 day weather forecast for Flat Branch, IL, USA
Weather Forecast for next 15 Days for Flat Branch 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 Flat Branch, 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 |  Patchy rain nearby |
21.1 ° C (70°F) |
33.5 ° C (92.3°F) |
27.3 ° C (81.1°F) |
% 65 | 69% | 6.8 | Sunrise:06:40 AM Sunset: 06:58 PM |
Moonrise:03:35 PM Moonset: Does not set today Moon Phase ( First Quarter ) |
|
| 20 September 2026 Sunday |  Overcast |
17.5 ° C (63.5°F) |
31.5 ° C (88.7°F) |
25.6 ° C (78.2°F) |
% 61 | 57% | 7 | Sunrise:06:41 AM Sunset: 06:56 PM |
Moonrise:04:13 PM Moonset: 12:39 AM Moon Phase ( Waxing Gibbous ) |
|
| 21 September 2026 Monday | Overcast |
16.8 ° C (62.2°F) |
22.8 ° C (73°F) |
18.9 ° C (66.1°F) |
% 83 | 88% | 3.7 | Sunrise:06:42 AM Sunset: 06:55 PM |
Moonrise:04:44 PM Moonset: 01:41 AM Moon Phase ( Waxing Gibbous ) |
|
| 22 September 2026 Tuesday | Overcast |
16.2 ° C (61.1°F) |
23.1 ° C (73.6°F) |
18.4 ° C (65.1°F) |
% 75 | 41% | 6 | Sunrise:06:43 AM Sunset: 06:53 PM |
Moonrise:05:10 PM Moonset: 02:43 AM Moon Phase ( Waxing Gibbous ) |
|
| 23 September 2026 Wednesday |  Cloudy |
12 ° C (53.7°F) |
20.3 ° C (68.5°F) |
16.7 ° C (62.1°F) |
% 76 | 45% | 6 | Sunrise:06:44 AM Sunset: 06:51 PM |
Moonrise:05:34 PM Moonset: 03:44 AM Moon Phase ( Waxing Gibbous ) |
|
| 24 September 2026 Thursday | Overcast |
12.5 ° C (54.4°F) |
20.3 ° C (68.5°F) |
16.1 ° C (60.9°F) |
% 70 | 17% | 5 | Sunrise:06:45 AM Sunset: 06:50 PM |
Moonrise:05:55 PM Moonset: 04:45 AM Moon Phase ( Full Moon ) |
|
| 25 September 2026 Friday | Overcast |
13.7 ° C (56.6°F) |
21.1 ° C (70°F) |
17.3 ° C (63.2°F) |
% 66 | 14% | 6 | Sunrise:06:46 AM Sunset: 06:48 PM |
Moonrise:06:15 PM Moonset: 05:46 AM Moon Phase ( Full Moon ) |
|
| 26 September 2026 Saturday | Sunny |
12.8 ° C (55.1°F) |
23.1 ° C (73.6°F) |
17.5 ° C (63.5°F) |
% 65 | 9% | 6 | Sunrise:06:47 AM Sunset: 06:46 PM |
Moonrise:06:37 PM Moonset: 06:47 AM Moon Phase ( Full Moon ) |
|
| 27 September 2026 Sunday | Overcast |
13.1 ° C (55.6°F) |
25.7 ° C (78.3°F) |
18.8 ° C (65.9°F) |
% 61 | 7% | 7 | Sunrise:06:48 AM Sunset: 06:45 PM |
Moonrise:06:59 PM Moonset: 07:49 AM Moon Phase ( Waning Gibbous ) |
|
| 28 September 2026 Monday | Overcast |
15.2 ° C (59.4°F) |
28.1 ° C (82.6°F) |
21.1 ° C (70.1°F) |
% 53 | 6% | 7 | Sunrise:06:49 AM Sunset: 06:43 PM |
Moonrise:07:25 PM Moonset: 08:55 AM Moon Phase ( Waning Gibbous ) |
|
| 29 September 2026 Tuesday |  Light rain shower |
13.9 ° C (57°F) |
20.2 ° C (68.4°F) |
16.9 ° C (62.4°F) |
% 73 | 84% | 4 | Sunrise:06:50 AM Sunset: 06:42 PM |
Moonrise:07:56 PM Moonset: 10:02 AM Moon Phase ( Waning Gibbous ) |
|
| 30 September 2026 Wednesday | Patchy rain nearby |
13.6 ° C (56.5°F) |
18.2 ° C (64.7°F) |
15.2 ° C (59.4°F) |
% 89 | 86% | 4 | Sunrise:06:51 AM Sunset: 06:40 PM |
Moonrise:08:34 PM Moonset: 11:12 AM Moon Phase ( Waning Gibbous ) |
|
| 01 October 2026 Thursday |  Fog |
12.1 ° C (53.8°F) |
19.1 ° C (66.3°F) |
15.3 ° C (59.5°F) |
% 79 | 19% | 5 | Sunrise:06:52 AM Sunset: 06:38 PM |
Moonrise:09:22 PM Moonset: 12:20 PM Moon Phase ( Last Quarter ) |
|
| 02 October 2026 Friday | Patchy rain nearby |
13.3 ° C (55.9°F) |
20 ° C (68°F) |
15.8 ° C (60.5°F) |
% 81 | 42% | 4 | Sunrise:06:52 AM Sunset: 06:37 PM |
Moonrise:10:20 PM Moonset: 01:25 PM Moon Phase ( Last Quarter ) |
|
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