Weathermondo.com
AustraliaThe weather in September in Rottnest Island
It's pleasantly warm in September in Rottnest Island with an average temperature of 20°C. Temperatures this month range from a low of 18°C to a high of 23°C. At night, you can expect temperatures between 9°C and 13°C.
Looking for great weather? September is a good time to be in Rottnest Island. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Rottnest Island, Australia. 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 33°C in 2023, Rottnest Island reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 13°C in 2021. The extreme nighttime temperatures ranged from a lowest recorded value of 1°C to a highest value of 18°C.
Rainfall amount
In September, there is an average of 38 mm of precipitation, spread over 8 days. The wind speed is around 5 Bft, mostly coming from the South.
Daily weather in September for Rottnest Island
Click on any day in September to get detailed info about the usual weather on that day in Rottnest Island. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Rottnest Island | New York | |
|---|---|---|
| Average temperature | 20°C | 27°C |
| Max. temperature | 23°C | 31°C |
| Min. temperature | 9°C | -5°C |
| Total precipitation | 38 mm | 57 mm |
| Rainy days | 8 days | 9 days |
Start of September
The month of September starts in Rottnest Island with mild temps, averaging around 20°C during the day and nights around 11°C.
Mid September
By mid-September, daytime temps rise to around 21°C, with nights around 11°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 Rottnest Island is around 22°C, while nighttime temps are about 12°C. A shower might pop up, but overall, the weather will be dry and sunny.
Find affordable trips to Rottnest Island
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Rottnest Island for all months and discover the best travel time
Curious about the weather in other parts of Australia? Check out the climate and weather for spots like Sydney, Gold Coast, Melbourne, or explore other destinations in Australia.
Temperature charts
These charts show the average temperatures in September in Rottnest Island, Australia. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Rottnest Island
Temperature in September in Rottnest Island over the years
Precipitation charts
These charts show the average amount of precipitation in September in Rottnest Island, Australia. 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 Rottnest Island
Total precipitation in September in Rottnest Island over the years
Daily UV index in September in Rottnest Island
This chart shows the average daily UV index in September in Rottnest Island, 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 Rottnest Island
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Average weather in Rottnest Island by month
Click on a month below to see detailed weather info for Rottnest Island. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.