Sioux Falls climate

Sioux Falls Weather in August

NOAA 1991-2020 normals for Sioux Falls, 4.9 km from Sioux Falls

Average highs run from 85°F on August 1 to 80°F on August 31, and lows from 63°F to 58°F. Normal precipitation for the month is 3.34 in over about 9 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Sioux Falls, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
83°F
Average low
61°F
Precipitation
3.34 in
Record high
105°FAug 2, 2022
Record low
44°FAug 17, 2012
Chance of a freeze
0%
Days of 90°F or more
3.5
Daylight
14 h 33 min to 13 h 14 min
Cloud cover
50%
Humidity
66%
Dew point
58°F
Wind
9.2 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 185°F63°F102°F 201255°F 201331%0%
Aug 285°F63°F105°F 202248°F 201831%0%
Aug 385°F63°F95°F 201252°F 201331%0%
Aug 485°F63°F90°F 202350°F 201731%0%
Aug 584°F63°F95°F 202250°F 202631%0%
Aug 684°F63°F98°F 201256°F 201631%0%
Aug 784°F63°F93°F 201258°F 201331%0%
Aug 884°F63°F89°F 201852°F 202630%0%
Aug 984°F63°F93°F 201651°F 202430%0%
Aug 1084°F62°F95°F 201650°F 202430%0%
Aug 1184°F62°F91°F 202354°F 201230%0%
Aug 1284°F62°F95°F 202253°F 201430%0%
Aug 1383°F62°F90°F 201850°F 201230%0%
Aug 1483°F62°F91°F 201554°F 201230%0%
Aug 1583°F62°F90°F 201554°F 202330%0%
Aug 1683°F61°F90°F 202053°F 201230%0%
Aug 1783°F61°F90°F 202144°F 201230%0%
Aug 1883°F61°F93°F 201651°F 201530%0%
Aug 1983°F61°F92°F 202351°F 201530%0%
Aug 2082°F61°F91°F 201350°F 201529%0%
Aug 2182°F60°F96°F 202351°F 201629%0%
Aug 2282°F60°F102°F 202354°F 201829%0%
Aug 2382°F60°F101°F 202350°F 201529%0%
Aug 2482°F60°F96°F 202046°F 201529%0%
Aug 2581°F60°F96°F 202047°F 201529%0%
Aug 2681°F59°F95°F 202048°F 202529%0%
Aug 2781°F59°F95°F 201355°F 201929%0%
Aug 2881°F59°F99°F 201251°F 201929%0%
Aug 2981°F58°F101°F 201250°F 201829%0%
Aug 3081°F58°F104°F 201251°F 201928%0%
Aug 3180°F58°F92°F 202253°F 202028%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Sioux Falls, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

August 1
sunrise 6:16 AM, sunset 8:49 PM
August 31
sunrise 6:50 AM, sunset 8:04 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00014944 (Sioux Falls), public domain. Records: NOAA GHCN-Daily, station USC00397666, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.