Cool
Average highs are around 15°C, so pack for cooler days.
September verdict
Mount William National Park, Australia in September
Weather score30Poor
Poor for holiday weather
Average highs are around 15°C, so pack for cooler days. Sunshine averages 6.1h per day, enough for a balanced month. Rainfall averages 65mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
15°C
Rain
65mm
Sun
6.1h
Sea
13°C
Weather score
30
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 65mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 6.1h per day, enough for a balanced month.
Cool sea
Sea temperatures average 13°C, so the water can feel cool.
Map
Weather map
Compare Mount William National Park, Australia with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September15°C average high
September is on the cooler side of Mount William National Park's year, useful if you prefer less intense daytime heat.
Warmest monthsJanuary to March and December
This stretch sets the upper range for average daytime heat.
Rain
September65mm average rain
September sits near Mount William National Park's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to April, June, and September to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September6.1 hours average sun
September sits close to Mount William National Park's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsJanuary to February and November to December
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September13°C average sea
September is one of the coolest sea months, so the water may feel fresher than in peak months.
Warmest seaJanuary to March
Sea temperatures are usually near 18°C in this stretch, so swimming comfort is at its strongest.
Weather score
September30 weather score
September scores below Mount William National Park's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJanuary to March
These months have the strongest weather score in the monthly averages.
