Cool
Average highs are around 18°C, so pack for cooler days.
September verdict
Aspen, Colorado, United States in September
Weather score45Mixed
Mixed for holiday weather
Average highs are around 18°C, so pack for cooler days. Sunshine averages 8.8h per day, so bright days are a strong part of the month. Rainfall averages 46mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
18°C
Rain
46mm
Sun
8.8h
Weather score
45
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 46mm, which is relatively low for holiday planning.
Bright
Sunshine averages 8.8h per day, so bright days are a strong part of the month.
Map
Weather map
Compare Aspen, Colorado, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September18°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September46mm average rain
September sits near Aspen's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsFebruary to November
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September8.8 hours average sun
September sits close to Aspen's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
September45 weather score
September sits close to Aspen's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsMay to August
These months have the strongest weather score in the monthly averages.
