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Sioux City, IA weather and climate

Plymouth County, IA · population 85,651 · about 1,102 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Sioux City's own coordinates.

The year at a glance

Sunny days
216
clear or partly cloudy, per year
Precipitation
33 in
per year
Wet days
105
rain or snow per year
Snowfall
35 in
per year
Hot days
25
above 90 °F
Freezing nights
155
at or below 32 °F
Humidity
69%
average relative
Average temperature
48 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
255075JanMarMayJulSepNovDaily high, Jan: 30 °FDaily high, Feb: 34 °FDaily high, Mar: 47 °FDaily high, Apr: 61 °FDaily high, May: 72 °FDaily high, Jun: 82 °FDaily high, Jul: 85 °FDaily high, Aug: 83 °FDaily high, Sep: 77 °FDaily high, Oct: 63 °FDaily high, Nov: 47 °FDaily high, Dec: 34 °FDaily low, Jan: 10 °FDaily low, Feb: 14 °FDaily low, Mar: 25 °FDaily low, Apr: 36 °FDaily low, May: 48 °FDaily low, Jun: 59 °FDaily low, Jul: 63 °FDaily low, Aug: 61 °FDaily low, Sep: 51 °FDaily low, Oct: 38 °FDaily low, Nov: 25 °FDaily low, Dec: 14 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high303447617282858377634734
Daily low101425364859636151382514

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovSioux City, Jan: 0.9 inSioux City, Feb: 1.1 inSioux City, Mar: 2.2 inSioux City, Apr: 4.0 inSioux City, May: 5.0 inSioux City, Jun: 4.8 inSioux City, Jul: 3.0 inSioux City, Aug: 3.9 inSioux City, Sep: 3.0 inSioux City, Oct: 2.4 inSioux City, Nov: 1.6 inSioux City, Dec: 1.2 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Sioux City0.91.12.24.05.04.83.03.93.02.41.61.2

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovSioux City, Jan: 16 daysSioux City, Feb: 14 daysSioux City, Mar: 16 daysSioux City, Apr: 15 daysSioux City, May: 16 daysSioux City, Jun: 19 daysSioux City, Jul: 23 daysSioux City, Aug: 22 daysSioux City, Sep: 22 daysSioux City, Oct: 20 daysSioux City, Nov: 17 daysSioux City, Dec: 16 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Sioux City161416151619232222201716

Compare Sioux City with another city

Nearby cities and popular picks. Any two cities can be compared from the home page.

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About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).