Big Sioux Weather Forecast 15 Days, Weather in Big Sioux Today
Current weather conditions and 15 day weather forecast for Big Sioux, South Dakota, 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 Big Sioux
| 27 August 2026 Thursday 17.9 ° C / 64.2°F  Clear |
Feels Like : 18 ° C / 64.4°F Humidity : % 81 Pressure : 1016 mb Wind Speed : 7.2 kmph / 4.5 miles from NW  Visibility : 10 km Precipitation (rainfall) : 0 mm Cloud (%) : 0 |
15 day weather forecast for Big Sioux, SD, USA
Weather Forecast for next 15 Days for Big Sioux 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 Big Sioux, South Dakota 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 27 August 2026 Thursday | Sunny |
15.5 ° C (59.9°F) |
30 ° C (86.1°F) |
23.2 ° C (73.8°F) |
% 57 | 3% | 7.3 | Sunrise:06:45 AM Sunset: 08:09 PM |
Moonrise:08:03 PM Moonset: 06:20 AM Moon Phase ( Full Moon ) |
|
| 28 August 2026 Friday | Sunny |
18.5 ° C (65.3°F) |
33.6 ° C (92.5°F) |
24.6 ° C (76.2°F) |
% 50 | 62% | 7 | Sunrise:06:46 AM Sunset: 08:07 PM |
Moonrise:08:22 PM Moonset: 07:23 AM Moon Phase ( Full Moon ) |
|
| 29 August 2026 Saturday |  Overcast |
19.8 ° C (67.7°F) |
37 ° C (98.6°F) |
27.3 ° C (81.1°F) |
% 58 | 59% | 8 | Sunrise:06:47 AM Sunset: 08:05 PM |
Moonrise:08:40 PM Moonset: 08:25 AM Moon Phase ( Waning Gibbous ) |
|
| 30 August 2026 Sunday | Overcast |
26 ° C (78.7°F) |
34.3 ° C (93.8°F) |
30 ° C (86°F) |
% 45 | 9% | 8 | Sunrise:06:49 AM Sunset: 08:04 PM |
Moonrise:08:59 PM Moonset: 09:29 AM Moon Phase ( Waning Gibbous ) |
|
| 31 August 2026 Monday | Overcast |
23.9 ° C (75°F) |
34.6 ° C (94.3°F) |
29.5 ° C (85.1°F) |
% 53 | 60% | 8 | Sunrise:06:50 AM Sunset: 08:02 PM |
Moonrise:09:20 PM Moonset: 10:34 AM Moon Phase ( Waning Gibbous ) |
|
| 01 September 2026 Tuesday | Sunny |
20 ° C (68°F) |
30.3 ° C (86.6°F) |
25.2 ° C (77.3°F) |
% 73 | 57% | 8 | Sunrise:06:51 AM Sunset: 08:00 PM |
Moonrise:09:44 PM Moonset: 11:41 AM Moon Phase ( Waning Gibbous ) |
|
| 02 September 2026 Wednesday | Overcast |
22.5 ° C (72.6°F) |
29.9 ° C (85.8°F) |
25.7 ° C (78.3°F) |
% 64 | 11% | 6 | Sunrise:06:52 AM Sunset: 07:59 PM |
Moonrise:10:15 PM Moonset: 12:52 PM Moon Phase ( Last Quarter ) |
|
| 03 September 2026 Thursday | Sunny |
20.3 ° C (68.5°F) |
32.3 ° C (90.2°F) |
25.7 ° C (78.3°F) |
% 65 | 7% | 7 | Sunrise:06:53 AM Sunset: 07:57 PM |
Moonrise:10:54 PM Moonset: 02:03 PM Moon Phase ( Last Quarter ) |
|
| 04 September 2026 Friday | Overcast |
21.3 ° C (70.3°F) |
32.1 ° C (89.8°F) |
25.5 ° C (77.9°F) |
% 70 | 11% | 8 | Sunrise:06:54 AM Sunset: 07:55 PM |
Moonrise:11:44 PM Moonset: 03:13 PM Moon Phase ( Last Quarter ) |
|
| 05 September 2026 Saturday | Sunny |
21.2 ° C (70.2°F) |
34.5 ° C (94.2°F) |
26.8 ° C (80.2°F) |
% 64 | 37% | 8 | Sunrise:06:55 AM Sunset: 07:54 PM |
Moonrise:Does not rise today Moonset: 04:17 PM Moon Phase ( Waning Crescent ) |
|
| 06 September 2026 Sunday | Sunny |
20.1 ° C (68.2°F) |
30.1 ° C (86.1°F) |
25.2 ° C (77.4°F) |
% 56 | 57% | 8 | Sunrise:06:56 AM Sunset: 07:52 PM |
Moonrise:12:47 AM Moonset: 05:11 PM Moon Phase ( Waning Crescent ) |
|
| 07 September 2026 Monday | Sunny |
14.1 ° C (57.4°F) |
27.9 ° C (82.1°F) |
21.4 ° C (70.5°F) |
% 41 | 36% | 7 | Sunrise:06:57 AM Sunset: 07:50 PM |
Moonrise:02:02 AM Moonset: 05:55 PM Moon Phase ( Waning Crescent ) |
|
| 08 September 2026 Tuesday | Sunny |
15.7 ° C (60.3°F) |
25.9 ° C (78.7°F) |
20.5 ° C (68.9°F) |
% 58 | 57% | 7 | Sunrise:06:58 AM Sunset: 07:48 PM |
Moonrise:03:23 AM Moonset: 06:29 PM Moon Phase ( Waning Crescent ) |
|
| 09 September 2026 Wednesday | Sunny |
10.1 ° C (50.2°F) |
29 ° C (84.1°F) |
19.2 ° C (66.6°F) |
% 42 | 2% | 7 | Sunrise:06:59 AM Sunset: 07:47 PM |
Moonrise:04:45 AM Moonset: 06:58 PM Moon Phase ( New Moon ) |
|
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