Swansea in September
So, what's Swansea actually like in September? In a word: fresh. It's spring, and the days are averaging 15.8 degrees.
The average daily maximum is 15.8 degrees with overnight lows of 7.2 degrees. Manageable with a decent layer, and you'll warm up by midday.
At 15.8 degrees, September sits 2.4 degrees below the annual average of 18.2 degrees.
The rain data says 46mm over 7 days. Light enough that it won't ruin your plans.
Sunshine-wise, September delivers around 13.3 MJ/m2 of daily solar radiation. UV sits in the high category. Sun protection is still a good idea, especially around midday.
At 4.1/10 on the Comfort Score, September is middle of the road.
Packing tip: bring a decent jumper or fleece, and serious sun protection.
The full data breakdown is below. You can also see how other Australian cities compare in September.
September at a Glance
Temperature Range
Daily temperature range in September. The bar shows the typical spread between overnight lows and afternoon highs.
What to Pack
- A jumper or light cardigan for flexibility
- A warm jumper or fleece for cool mornings and evenings
- A light rain jacket just in case
Coming From Overseas?
How September in Swansea stacks up against major cities around the world.
About 4 degrees cooler and considerably drier.
About 10 degrees cooler and considerably drier.
About 11 degrees cooler and considerably drier.
How September Compares
Swansea's monthly climate at a glance. September is highlighted.
| Month | Max | Min | Rain | Comfort |
|---|---|---|---|---|
| Jan | 22.7 | 13.3 | 62mm | 9.5 |
| Feb | 24.6 | 13.0 | 22mm | 10.0 |
| Mar | 22.6 | 11.9 | 24mm | 9.4 |
| Apr | 18.2 | 8.8 | 67mm | 5.6 |
| May | 15.1 | 7.6 | 59mm | 2.7 |
| Jun | 12.3 | 6.5 | 40mm | 1.0 |
| Jul | 12.3 | 5.3 | 92mm | 1.0 |
| Aug | 15.1 | 7.6 | 64mm | 2.9 |
| Sep | 15.8 | 7.2 | 46mm | 4.1 |
| Oct | 17.9 | 8.0 | 54mm | 6.0 |
| Nov | 19.8 | 10.6 | 77mm | 7.3 |
| Dec | 21.9 | 12.5 | 95mm | 8.8 |