Williamstown weather in September 2025

The temperatures in Williamstown in September are comfortable with low of 17°C and and high up to 25°C.

You can expect about 3 to 8 days of rain in Williamstown during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.

Our weather forecast can give you a great sense of what weather to expect in Williamstown in September 2025.

If you’re planning to visit Williamstown in the near future, we highly recommend that you review the 14 day weather forecast for Williamstown before you arrive.

Temperatures

25° / 17°

Rainy Days

Snowy Days

Dry Days

Rainfall

106

Sun Hours

7.1

Hrs

Sun	Mon	Tue	Wed	Thu	Fri	Sat
	1 28° /18°	2 28° /16°	3 29° /17°	4 30° /19°	5 30° /19°	6 28° /20°
7 26° /19°	8 27° /16°	9 28° /17°	10 29° /17°	11 27° /18°	12 28° /18°	13 27° /17°
14 26° /16°	15 26° /16°	16 26° /14°	17 25° /16°	18 24° /16°	19 25° /16°	20 25° /17°
21 26° /17°	22 22° /15°	23 19° /13°	24 20° /13°	25 21° /15°	26 22° /16°	27 22° /15°
28 20° /13°	29 19° /14°	30 20° /15°

Explore the weather in Williamstown in other months

Williamstown annual weather

Month	Temperatures	Rainy Days	Dry Days	Snowy Days	Rainfall	Weather	More details
January	4° / -2°	8	20	3	84 mm	Awful	Williamstown in January
February	6° / -2°	8	17	3	97 mm	Awful	Williamstown in February
March	11° / 2°	8	21	2	115 mm	Awful	Williamstown in March
April	17° / 8°	7	23	0	102 mm	Ok	Williamstown in April
May	22° / 13°	8	23	0	100 mm	Ok	Williamstown in May
June	27° / 18°	10	20	0	121 mm	Good	Williamstown in June
July	30° / 21°	11	20	0	124 mm	Ok	Williamstown in July
August	29° / 21°	10	21	0	135 mm	Ok	Williamstown in August
September	25° / 17°	7	23	0	106 mm	Good	Williamstown in September
October	19° / 11°	7	24	0	135 mm	Ok	Williamstown in October
November	12° / 5°	5	25	0	82 mm	Ok	Williamstown in November
December	8° / 1°	7	23	1	126 mm	Bad	Williamstown in December

Temperatures in Williamstown in September

Rain in Williamstown in September

Weather in Williamstown in September - FAQ

What is the average temperature in Williamstown in September?

The average temperature in Williamstown in September is 17/25° C.

What is the chance of rain in Williamstown in September?

On average, there are 7 rainy days in Williamstown during September.

Weather wise, is September a good time to visit Williamstown?

The weather in Williamstown in September is good.

Can it snow in Williamstown in September?

On average, there are 0 snowy days in Williamstown in September.

More about the weather in Williamstown