The weather in September in Heard Island and McDonald Islands
It's cold in September in Heard Island and McDonald Islands with an average temperature of 1°C. Temperatures this month range from a low of 1°C to a high of 2°C. At night, you can expect temperatures between -2°C and 0°C.
Looking for sun? September isn’t a good month to be in Heard Island and McDonald Islands. There’s too much chance of rain this month.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Heard Island and McDonald Islands. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 6°C in 2017, Heard Island and McDonald Islands reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was -4°C in 2023. The extreme nighttime temperatures ranged from a lowest recorded value of -6°C to a highest value of 3°C.
Precipitation and snowfall
In September, there is an average of 114 mm of precipitation, spread over 15 days. Of the total precipitation, about 37 cm falls as snow in September. The wind speed is around 7 Bft, mostly coming from the West.
Daily weather in September for Heard Island and McDonald Islands
Click on any day in September to get detailed info about the usual weather on that day in Heard Island and McDonald Islands. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Heard Island and McDonald Islands | New York | |
|---|---|---|
| Average temperature | 1°C | 27°C |
| Max. temperature | 2°C | 31°C |
| Min. temperature | -2°C | -5°C |
| Total precipitation | 114 mm | 57 mm |
| Rainy days | 15 days | 9 days |
| Total snowfall | 37 cm | 0 cm |
| Snowy days | 17 days | 0 days |
Start of September
The month of September starts in Heard Island and McDonald Islands with really cold temps, averaging around 2°C during the day and nights dipping to about 0°C.
Mid September
By mid-September, daytime temps stay steady at around 2°C, with nights around 0°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Heard Island and McDonald Islands is around 2°C, while nighttime temps are about 0°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
UV index
The UV index is a maximum of 6 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Temperature charts
These charts show the average temperatures in September in Heard Island and McDonald Islands. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Heard Island and McDonald Islands
Temperature in September in Heard Island and McDonald Islands over the years
Precipitation charts
These charts show the average amount of precipitation in September in Heard Island and McDonald Islands. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Heard Island and McDonald Islands
Total precipitation in September in Heard Island and McDonald Islands over the years
Daily Snowfall in September in Heard Island and McDonald Islands
Snowfall in September in Heard Island and McDonald Islands per year
Daily UV index in September in Heard Island and McDonald Islands
This chart shows the average daily UV index in September in Heard Island and McDonald Islands, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Heard Island and McDonald Islands
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Average weather in Heard Island and McDonald Islands by month
Click on a month below to see detailed weather info for Heard Island and McDonald Islands. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.