Big Sioux Rainfall Forecast

Today 10 Sep
No Rain
Fri 11 Sep
5%
Sat 12 Sep
10%
Sun 13 Sep
55%
Mon 14 Sep
80%
Tue 15 Sep
10%
Wed 16 Sep
35%

Big Sioux Rainfall Statistics

September Rainfall

Sioux Falls, Foss Field (7.5 miles)

Total Rainfall 2026
13.5in
Daily Average 2026
0.1in
Wettest Day 1 July, 2026
1.8in
Wet Days 2026
61/253 (24%)
Total Rainfall August
1.2in
Daily Average August
0.04in
Wettest Day 13 August, 2026
0.7in
Wet Days August
9/31 (29%)
Total Rainfall September
0.4in
Daily Average September
0.1in
Wettest Day 5 September, 2026
0.2in
Wet Days September
5/10 (50%)

Climate (2021–2025)

Sioux Falls, Foss Field (7.5 miles)

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Annual Average 2021–2025
25.5in
Monthly Average 2021–2026
2in
Daily Average 2021–2026
0.1in
Wettest Day 3 January, 2023
6in

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