Cool
Average highs are around 11°C, so pack for cooler days.
September verdict
Unalaska, United States in September
Weather score23Poor
Poor for holiday weather
Average highs are around 11°C, so pack for cooler days. Sunshine averages 6.4h per day, enough for a balanced month. Rainfall averages 100mm, so some wet days are possible.
September weather
Monthly averages
Temp
11°C
Rain
100mm
Sun
6.4h
Sea
9°C
Weather score
23
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 100mm, so some wet days are possible.
Some sun
Sunshine averages 6.4h per day, enough for a balanced month.
Cool sea
Sea temperatures average 9°C, so the water can feel cool.
Map
Weather map
Compare Unalaska, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September11°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJuly to September
This stretch sets the upper range for average daytime heat.
Rain
September100mm average rain
September is wetter than Unalaska's yearly average, so flexible plans matter more.
Driest monthsJanuary to July
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September6.4 hours average sun
September sits close to Unalaska's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMarch to June
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September9°C average sea
September sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaJuly to September
Sea temperatures are usually near 9°C in this stretch, so swimming comfort is at its strongest.
Weather score
September23 weather score
September sits close to Unalaska's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsFebruary to September
These months have the strongest weather score in the monthly averages.