Cool
Average highs are around 5°C, so pack for cooler days.
September verdict
Heard Island and McDonald Islands in September
Weather score21Poor
Poor for holiday weather
Average highs are around 5°C, so pack for cooler days. Sunshine averages 0h per day, so this is not one of the brighter months. Rainfall averages 91mm, so some wet days are possible.
September weather
Monthly averages
Temp
5°C
Rain
91mm
Sun
0h
Sea
1°C
Weather score
21
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 91mm, so some wet days are possible.
Limited sun
Sunshine averages 0h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 1°C, so the water can feel cool.
Map
Weather map
Compare Heard Island and McDonald Islands with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September5°C average high
September has some of the coolest average daytime highs of the year, so pack for fresher conditions.
Warmest monthsJanuary to May
This stretch sets the upper range for average daytime heat.
Rain
September91mm average rain
September is one of Heard Island and McDonald Islands' driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsJanuary to February and June to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September0 hours average sun
September is close to Heard Island and McDonald Islands' usual sunshine level, with limited seasonal swing across the year.
Brightest monthsAll year
Sunshine stays consistently strong through the year.
Sea temperature
September1°C average sea
September is one of the coolest sea months, so the water may feel fresher than in peak months.
Warmest seaJanuary to June and December
Sea temperatures are usually near 3°C in this stretch, so swimming comfort is at its strongest.
Weather score
September21 weather score
September scores below Heard Island and McDonald Islands' yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJanuary to February and November to December
These months have the strongest weather score in the monthly averages.