Cool
Average highs are around 5°C, so pack for cooler days.
Weather Guide
Heard Island and McDonald Islands Average Monthly Weather
Weather score23Poor annual avg
Best months: December, January, November
Across the year, average daytime temperatures are around 6°C, sunshine averages 0h per day, and rainfall totals about 1288mm. Sea temperatures average 2°C across the year.
Annual weather
Annual averages
Temp
6°C
Rain
1288mm
Annual total
Sun
0h
Sea
2°C
Weather score
23
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 118mm, 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 2°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
August5°C average high
August 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
August118mm average rain
August is wetter than Heard Island and McDonald Islands' yearly average, so flexible plans matter more.
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
August0 hours average sun
August 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
August2°C average sea
August 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
August18 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 February and November to December
These months have the strongest weather score in the monthly averages.