Cool
Average highs are around 18°C, so pack for cooler days.
Weather Guide
Perth, Western Australia, Australia Average Monthly Weather
Weather score60Good annual avg
Best months: January, February, December
Across the year, average daytime temperatures are around 24°C, sunshine averages 8h per day, and rainfall totals about 824mm. Sea temperatures average 21°C across the year.
Annual weather
Annual averages
Temp
24°C
Rain
824mm
Annual total
Sun
8h
Sea
21°C
Weather score
60
Good avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 118mm, so some wet days are possible.
Some sun
Sunshine averages 6.4h per day, enough for a balanced month.
Cool sea
Sea temperatures average 19°C, so the water can feel cool.
Map
Weather map
Compare Perth, Western Australia, Australia with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August18°C average high
August has some of the coolest average daytime highs of the year, so pack for fresher conditions.
Warmest monthsJanuary to March and December
This stretch sets the upper range for average daytime heat.
Rain
August118mm average rain
August is wetter than Perth's yearly average, so flexible plans matter more.
Driest monthsJanuary to April and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August6.4 hours average sun
August is below Perth's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsJanuary to February and December
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August19°C average sea
August is below Perth's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJanuary to May
Sea temperatures are usually near 22°C in this stretch, so swimming comfort is at its strongest.
Weather score
August36 weather score
August is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJanuary to March and December
These months have the strongest weather score in the monthly averages.
