September weather forecastUpper Swan, Australia
September
Weather in September
The first month of the spring, September, is still a refreshing month in Upper Swan, Australia, with an average temperature ranging between min 8.7°C (47.7°F) and max 19.1°C (66.4°F).Temperature
Transitioning from August to September, Upper Swan observes an average high-temperature of a still refreshing 19.1°C (66.4°F), differing subtly from the previous month. In the month of September, the average low-temperature in Upper Swan usually rests at a frosty 8.7°C (47.7°F).Humidity
In September, the average relative humidity is 74%.Rainfall
In September, in Upper Swan, the rain falls for 11.2 days. Throughout September, 25mm (0.98") of precipitation is accumulated. In Upper Swan, during the entire year, the rain falls for 100 days and collects up to 290mm (11.42") of precipitation.Daylight
In Upper Swan, the average length of the day in September is 11h and 54min.On the first day of September, sunrise is at 6:32 am and sunset at 5:59 pm. On the last day of the month, sunrise is at 5:54 am and sunset at 6:17 pm AWST.
Sunshine
In Upper Swan, the average sunshine in September is 7.9h.UV index
In Upper Swan, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: In September, a daily UV index of 5 turns into the following recommendations:
Ensure safety - Recommendations to avert sunburn are presented. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Upper Swan, Australia
- Average high temperature in September: 19.1°C
The warmest month (with the highest average high temperature) is February (32°C).
The month with the lowest average high temperature is July (16.8°C).
- Average low temperature in September: 8.7°C
The month with the highest average low temperature is February (18.9°C).
The coldest month (with the lowest average low temperature) is August (8.5°C).
Average pressure in September
Upper Swan, Australia
- Average pressure in September: 1019.1mbar
The month with the highest atmospheric pressure is July (1020.7mbar).
The month with the lowest atmospheric pressure is January (1011mbar).
Average wind speed in September
Upper Swan, Australia
- Average wind speed in September: 10.7km/h
The windiest months (with the highest average wind speed) are January and February (12.6km/h).
The calmest months (with the lowest average wind speed) are May and July (10km/h).
Average humidity in September
Upper Swan, Australia
- Average humidity in September: 74%
The months with the highest relative humidity are July and August (78%).
The month with the lowest relative humidity is January (49%).
Average rainfall in September
Upper Swan, Australia
- Average rainfall in September: 25mm
The wettest month (with the highest rainfall) is June (51mm).
The driest months (with the least rainfall) are March and December (9mm).
Average rainfall days in September
Upper Swan, Australia
- Average rainfall days in September: 11.2 days
The month with the highest number of rainy days is July (13.5 days).
The month with the least rainy days is February (4.8 days).
Average daylight in September /
Average sunshine in September
Upper Swan, Australia
- Average daylight in September: 11h and 54min
The month with the longest days is December (Average daylight: 14h and 12min).
The month with the shortest days is June (Average daylight: 10h and 6min).
- Average sunshine in September: 7h and 54min
The months with the most sunshine are January and December (Average sunshine: 11h and 30min).
The month with the least sunshine is August (Average sunshine: 5h and 42min).
Average sunshine days in September
Upper Swan, Australia
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is December (24.5 days).
The month with the least sunshine days is July (15.1 days).
Average UV index in September
Upper Swan, Australia
- Average UV index in September: 5
The month with the highest UV index is February (UV index 7).
The months with the lowest UV index are May, June, July and August (UV index 4).
Average cloud cover in September
Upper Swan, Australia
- Average cloud cover in September: 36
The months with the most cloud cover are July and August (Cloud cover 41).
The month with the least cloud cover is January (Cloud cover 14).
Average visibility in September
Upper Swan, Australia
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, November and December (10km).
The months with the lowest visibility are May, June, July, August, September and October (9km).
