The highest day temperature in January 2026 was 57°F. The lowest night temperature was -21°F. The average values for day and night temperatures during January were 21.5°F и 8.3°F respectivly.

Most of the days in January are gloomy but you can also expect sunny days.

Precipitation total in January for Sioux Falls is 0.3 in. It makes january one of the least rainy months of the year.

The average wind speed in January is 9.6 mph. It makes January one of the most windless months of the year for Sioux Falls.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Sioux Falls in January is 4.5 hours.