Warm
Average highs sit around 29°C, giving warm days by monthly-average standards.
Weather Guide
Sioux City, Iowa, United States Average Monthly Weather
Weather score53Mixed annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 15°C, sunshine averages 7.3h per day, and rainfall totals about 657mm.
Annual weather
Annual averages
Temp
15°C
Rain
657mm
Annual total
Sun
7.3h
Weather score
53
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 75mm, which is relatively low for holiday planning.
Bright
Sunshine averages 9.4h per day, so bright days are a strong part of the month.
Map
Weather map
Compare Sioux City, Iowa, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August29°C average high
August is one of Sioux City's warmest months, with daytime heat above the yearly average.
Warmest monthsMay to September
This stretch sets the upper range for average daytime heat.
Rain
August75mm average rain
August is wetter than Sioux City's yearly average, so flexible plans matter more.
Driest monthsJanuary to February and November to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August9.4 hours average sun
August is brighter than Sioux City's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
August81 weather score
August scores above Sioux City's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
