Warm
Average highs sit around 29°C, giving warm days by monthly-average standards.
Weather Guide
Longmont, Colorado, United States Average Monthly Weather
Weather score54Mixed annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 17°C, sunshine averages 8.3h per day, and rainfall totals about 400mm.
Annual weather
Annual averages
Temp
17°C
Rain
400mm
Annual total
Sun
8.3h
Weather score
54
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 33mm, which is relatively low for holiday planning.
Bright
Sunshine averages 9.8h per day, so bright days are a strong part of the month.
Map
Weather map
Compare Longmont, Colorado, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August29°C average high
August is one of Longmont's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August33mm average rain
August sits near Longmont's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to March and August to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August9.8 hours average sun
August is brighter than Longmont's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
August79 weather score
August scores above Longmont'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.
