Warm
Average highs sit around 30°C, giving warm days by monthly-average standards.
Weather Guide
Waterloo, Iowa, United States Average Monthly Weather
Weather score50Mixed annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 15°C, sunshine averages 7.2h per day, and rainfall totals about 884mm.
Annual weather
Annual averages
Temp
15°C
Rain
884mm
Annual total
Sun
7.2h
Weather score
50
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 119mm, so some wet days are possible.
Bright
Sunshine averages 10h per day, so bright days are a strong part of the month.
Map
Weather map
Compare Waterloo, Iowa, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
July30°C average high
July is one of Waterloo'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
July119mm average rain
July is one of Waterloo's wettest months, so rain is likely to be a major planning factor.
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
July10 hours average sun
July is one of Waterloo's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
July82 weather score
July is one of Waterloo's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
