Cool
Average highs are around 20°C, so pack for cooler days.
September verdict
Mount Vernon, Washington, United States in September
Weather score49Mixed
Mixed for holiday weather
Average highs are around 20°C, so pack for cooler days. Sunshine averages 6.6h per day, enough for a balanced month. Rainfall averages 60mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
20°C
Rain
60mm
Sun
6.6h
Weather score
49
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 60mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 6.6h per day, enough for a balanced month.
Map
Weather map
Compare Mount Vernon, Washington, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September20°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
September60mm average rain
September sits on the drier side of Mount Vernon's year, which helps with sightseeing and transfers.
Driest monthsMay to September
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September6.6 hours average sun
September sits close to Mount Vernon's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
September49 weather score
September sits close to Mount Vernon's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
