September weather forecastDee Why, Australia
September
Weather in September
Sea temperature
The month with the coldest seawater in Dee Why, Australia, is September, with an average sea temperature of 18.6°C (65.5°F).Note: Swimming in water that is 18.6°C (65.5°F) is not enjoyable for most. Breathing becomes more challenging to manage as the water temperature dips from 21°C (69.8°F) to 15°C (59°F).
Daylight
The average length of the day in September is 11h and 53min.On the first day of the month, sunrise is at 6:12 am and sunset at 5:37 pm. On the last day of September, in Dee Why, sunrise is at 5:32 am and sunset at 5:56 pm AEST.
Updated: Jan 26, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
With an average sea temperature of 18.6°C (65.5°F), September is the month with the coldest seawater in Dee Why.
In Dee Why, Australia, in September, the average water temperature is 18.6°C (65.5°F). For swimming, a surface water temperature of 18.6°C (65.5°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).
In Dee Why, Australia, the average day length in September is 11h and 53min.
In September, on the first day of the month, sunrise is at 6:12 am and sunset at 5:37 pm. On the last day of the month, in Dee Why, Australia, sunrise is at 5:32 am and sunset at 5:56 pm AEST.
Average sea temperature in September
Dee Why, Australia
- Average sea temperature in September: 18.6°C
The best month for swimming (with the highest average sea temperature) is February (23.7°C).
The coldest month (with the lowest average sea temperature) is September (18.6°C).
Average daylight in September
Dee Why, Australia
- Average daylight in September: 11h and 54min
The month with the longest days is December (Average daylight: 14h and 24min).
The month with the shortest days is June (Average daylight: 9h and 54min).
