Williamstown in September
7.8out of 10
Yes, a good time to go
Warm and comfortable: highs around 26°C. Frequent rain: about 9 rainy days.
26°CAvg high
17°CAvg low
9Rainy days (98 mm)
12:15 hDaylight
06:47Sunrise · 19:02 Sunset
Why this score
- Warm and comfortable: highs around 26°C
- Frequent rain: about 9 rainy days
What to wear and pack
- T-shirts and light layers
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±3.3 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 6°C | -2°C | 80 mm | 9 | – | – | 4.9 |
| February | 7°C | -1°C | 75 mm | 9 | – | – | 5.3 |
| March | 12°C | 2°C | 102 mm | 10 | – | – | 5.9 |
| April | 18°C | 8°C | 87 mm | 10 | – | – | 7.1 |
| May | 23°C | 13°C | 86 mm | 11 | – | – | 7.6 |
| June | 28°C | 18°C | 97 mm | 11 | – | – | 7.5 |
| July | 30°C | 21°C | 96 mm | 11 | – | – | 7.2 |
| August | 29°C | 20°C | 107 mm | 11 | – | – | 7.5 |
| September | 26°C | 17°C | 98 mm | 9 | – | – | 7.8 |
| October | 19°C | 10°C | 93 mm | 8 | – | – | 7.6 |
| November | 13°C | 5°C | 73 mm | 8 | – | – | 6.6 |
| December | 8°C | 1°C | 98 mm | 10 | – | – | 5.4 |
Frequently asked questions
How hot is Williamstown in September?
Daytime highs average 26°C and nights about 17°C.
When is the best time to visit Williamstown?
The best months are September, May, October, June.