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Monthly climate in Sioux City, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Sioux City features a humid continental climate (Dfa).Temperatures typically range between -5 °C (23 °F) and 25 °C (77 °F) through the year, but rarely can drop to -33 °C (-26 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 881 mm (34.7 inches) and receives 98 rainy days on the 1 mm (0.04 inches) threshold annually.Sioux City enjoys an average of 3115 hours of sunshine throughout the year, and daylight varies from 9 hours 5 minutes to 15 hours 14 minutes per day.

Monthly average temperatures in Sioux City, Iowa, United States §

The warmest months in Sioux City are June, July and August, with daily mean temperatures ranging from 23 to 25 °C (73 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -5 to -2 °C (23 - 29 °F) throughout the day. On average each year, Sioux City experiences 94 days above 25 °C (77.0 °F) and 128 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sioux City, Iowa, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 12°C
(54°F)		 21°C
(71°F)		 25°C
(77°F)		 29°C
(85°F)		 35°C
(96°F)		 35°C
(96°F)		 36°C
(97°F)		 36°C
(97°F)		 34°C
(94°F)		 31°C
(89°F)		 27°C
(80°F)		 19°C
(67°F)
Mean maximum 10°C
(50°F)		 14°C
(57°F)		 22°C
(72°F)		 27°C
(81°F)		 32°C
(90°F)		 33°C
(92°F)		 35°C
(95°F)		 33°C
(91°F)		 33°C
(91°F)		 29°C
(85°F)		 20°C
(67°F)		 13°C
(56°F)
Average high -0°C
(32°F)		 0°C
(32°F)		 9°C
(48°F)		 15°C
(59°F)		 21°C
(70°F)		 29°C
(84°F)		 30°C
(86°F)		 28°C
(83°F)		 25°C
(78°F)		 16°C
(61°F)		 9°C
(48°F)		 3°C
(38°F)
Daily mean -5°C
(23°F)		 -5°C
(23°F)		 3°C
(38°F)		 9°C
(48°F)		 16°C
(61°F)		 23°C
(74°F)		 25°C
(77°F)		 23°C
(73°F)		 20°C
(68°F)		 10°C
(51°F)		 3°C
(38°F)		 -2°C
(29°F)
Average low -9°C
(15°F)		 -10°C
(14°F)		 -1°C
(30°F)		 3°C
(37°F)		 11°C
(52°F)		 18°C
(64°F)		 20°C
(68°F)		 18°C
(64°F)		 14°C
(58°F)		 5°C
(42°F)		 -2°C
(28°F)		 -6°C
(21°F)
Mean minimum -23°C
(-9°F)		 -23°C
(-8°F)		 -12°C
(11°F)		 -7°C
(20°F)		 3°C
(38°F)		 11°C
(53°F)		 14°C
(57°F)		 11°C
(53°F)		 6°C
(44°F)		 -4°C
(24°F)		 -11°C
(12°F)		 -17°C
(2°F)
Minimum -31°C
(-24°F)		 -33°C
(-26°F)		 -22°C
(-8°F)		 -11°C
(12°F)		 1°C
(34°F)		 8°C
(47°F)		 12°C
(53°F)		 9°C
(49°F)		 4°C
(40°F)		 -9°C
(17°F)		 -15°C
(5°F)		 -23°C
(-9°F)

Compare climate in Sioux City with other places

Compare temperature, precipitation, sunshine, UV index in Sioux City, Iowa, United States with other places around the world.

Monthly average precipitation in Sioux City, Iowa, United States §

Sioux City usually has the most precipitation in May, June and August, with an average of 11 rainy days and 117 mm (4.6 inches) of precipitation per month.The driest months in Sioux City are January, February and November. On average, 28 mm (1.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sioux City, Iowa, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 28 (1.1) 29 (1.2) 81 (3.2) 80 (3.2) 140 (5.5) 102 (4.0) 66 (2.6) 109 (4.3) 101 (4.0) 77 (3.0) 27 (1.0) 41 (1.6)
Average precipitation days (≥ 1 mm) 4 6 8 11 15 10 8 9 9 9 5 4

Monthly sunshine hours in Sioux City, Iowa, United States §

The sunniest months in Sioux City are June, July and August, when the sun shines an average of 11 hours 30 minutes a day.Least sunny months in Sioux City: January, February and December receive an average of 6 hours 20 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sioux City, Iowa, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 154 208 223 259 271 354 377 327 273 233 218 213
Mean daily daylight hours 9h 27m 10h 33m 11h 58m 13h 24m 14h 37m 15h 14m 14h 54m 13h 48m 12h 25m 10h 59m 9h 44m 9h 5m

Solar UV radiation in Sioux City, Iowa, United States §

Sioux City experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Sioux City UV Index data.

Average daily maximum UV levels by month for Sioux City, Iowa, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 5 5 8 9 11 10 9 8 5 3 2