Annual mean 8°C · wettest around May · prevailing wind W
Warmest
26.8 °C
Coldest
-7.6 °C
Wettest
43%
Windiest
6.3 m/s
Prevailing
W
4.9 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Sioux Falls over the whole year is 8°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -10°C. Sioux Falls has no sharply defined rainy season: the chance of rain on a given day runs from 34% in December, the driest month, to 41% in May, the wettest. Winds in Sioux Falls are highest in April, averaging 4.9 m/s (18 km/h), and lightest in July, at 3.0 m/s (11 km/h). The prevailing wind is from the W. The clearest skies in Sioux Falls come in July, when the sky is typically 33% covered; January is the cloudiest month, at 57%.
Month by month Sioux Falls climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-6°C
-10°C
-12°C
35%
57%
3.9 m/s
0
0
0
February
-4°C
-9°C
-11°C
35%
51%
4.0 m/s
0
0
4
March
4°C
-2°C
-2°C
38%
54%
4.5 m/s
2
0
14
April
11°C
3°C
4°C
41%
52%
4.9 m/s
11
0
38
May
19°C
11°C
15°C
41%
49%
4.0 m/s
48
8
64
June
26°C
18°C
24°C
41%
38%
3.8 m/s
64
42
38
July
27°C
19°C
26°C
38%
33%
3.0 m/s
55
58
22
August
25°C
17°C
25°C
39%
39%
3.0 m/s
66
44
36
September
22°C
13°C
20°C
37%
38%
3.3 m/s
67
23
58
October
13°C
5°C
8°C
38%
43%
3.8 m/s
23
1
51
November
5°C
-1°C
-1°C
35%
48%
4.0 m/s
4
0
18
December
-3°C
-7°C
-9°C
34%
53%
4.0 m/s
0
0
2
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Sioux Falls weather by season
Year round, Sioux Falls has days of about -6°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -10°C to 19°C through the year, and the average temperature over the year is 8°C around the clock. Rain is most likely around May and least likely around December. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Sioux Falls weather in winterDecember to February
High -4°CLow -9°CRain 35%
Winter in Sioux Falls has typical daily highs of about -4°C and lows of about -9°C, with a 35% chance of rain on a given day.
Sioux Falls weather in springMarch to May
High 11°CLow 4°CRain 40%
Spring in Sioux Falls has typical daily highs of about 11°C and lows of about 4°C, with a 40% chance of rain on a given day.
Sioux Falls weather in summerJune to August
High 26°CLow 18°CRain 39%
Summer in Sioux Falls has typical daily highs of about 26°C and lows of about 18°C, with a 39% chance of rain on a given day.
Sioux Falls weather in autumnSeptember to November
High 13°CLow 6°CRain 37%
Autumn in Sioux Falls has typical daily highs of about 13°C and lows of about 6°C, with a 37% chance of rain on a given day.
When is the rainy season in Sioux Falls?
Sioux Falls has no sharply defined rainy season: the chance of rain on a given day runs from 34% in December, the driest month, to 41% in May, the wettest.
What time of year is Sioux Falls windiest?
Winds in Sioux Falls are highest in April, averaging 4.9 m/s (18 km/h), and lightest in July, at 3.0 m/s (11 km/h). The prevailing wind is from the W.
What is the average temperature in Sioux Falls year round?
The average temperature in Sioux Falls over the whole year is 8°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -10°C.