Atherton in September
If September is your window for visiting Atherton, here's what the climate data says you can expect.
The average daily maximum is 23.3 degrees with overnight lows of 14.9 degrees. That's solidly pleasant territory. Great for being outdoors.
September is 1.5 degrees cooler than Atherton's yearly average.
Rainfall in September averages 43mm over about 11 days. That means roughly a 37% chance of rain on any given day, pack a compact umbrella just in case.
Sunshine-wise, September delivers around 19.2 MJ/m2 of daily solar radiation. UV sits in the very high category. You'll want SPF 50+ and a decent hat.
Our Comfort Score rates September at 9.7/10. That's about as good as it gets.
For your suitcase: t-shirts with a light layer for evenings, and SPF 50+ sunscreen and a hat.
Check the data table below for the full picture, or compare Atherton in September with another destination.
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
- T-shirts and shorts for daytime
- A waterproof jacket or compact umbrella
- Sunscreen (SPF 30+) and sunglasses for UV protection
Coming From Overseas?
How September in Atherton stacks up against major cities around the world.
About 3 degrees warmer and considerably drier.
About 3 degrees cooler and considerably drier.
About 4 degrees cooler and considerably drier.
How September Compares
Atherton's monthly climate at a glance. September is highlighted.
| Month | Max | Min | Rain | Comfort |
|---|---|---|---|---|
| Jan | 27.5 | 20.4 | 418mm | 5.6 |
| Feb | 26.8 | 20.2 | 182mm | 5.8 |
| Mar | 25.8 | 19.7 | 245mm | 6.3 |
| Apr | 24.2 | 17.6 | 76mm | 8.8 |
| May | 21.8 | 16.1 | 36mm | 7.3 |
| Jun | 22.5 | 12.7 | 11mm | 9.5 |
| Jul | 20.3 | 12.2 | 14mm | 7.5 |
| Aug | 22.3 | 13.3 | 14mm | 9.3 |
| Sep | 23.3 | 14.9 | 43mm | 9.7 |
| Oct | 26.6 | 16.1 | 10mm | 9.5 |
| Nov | 28.1 | 17.2 | 61mm | 8.0 |
| Dec | 28.2 | 19.5 | 382mm | 5.8 |