Manassas weather in September 2025

The temperatures in Manassas in September are comfortable with low of 16°C and and high up to 27°C.

You can expect about 3 to 8 days of rain in Manassas 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 Manassas in September 2025.

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

Temperatures

27° / 16°

Rainy Days

Snowy Days

Dry Days

Rainfall

113

Sun Hours

7.2

Hrs

Sun	Mon	Tue	Wed	Thu	Fri	Sat
	1 30° /16°	2 29° /15°	3 31° /15°	4 31° /17°	5 28° /18°	6 30° /19°
7 26° /17°	8 27° /15°	9 29° /14°	10 30° /15°	11 29° /17°	12 28° /17°	13 28° /17°
14 28° /15°	15 27° /13°	16 27° /13°	17 23° /15°	18 26° /15°	19 28° /15°	20 28° /15°
21 28° /15°	22 22° /15°	23 22° /14°	24 20° /14°	25 24° /14°	26 23° /16°	27 22° /15°
28 21° /12°	29 23° /15°	30 20° /13°

Explore the weather in Manassas in other months

Manassas annual weather

Month	Temperatures	Rainy Days	Dry Days	Snowy Days	Rainfall	Weather	More details
January	5° / -3°	6	19	7	101 mm	Awful	Manassas in January
February	7° / -2°	7	15	6	112 mm	Awful	Manassas in February
March	12° / 3°	8	20	4	126 mm	Awful	Manassas in March
April	19° / 8°	7	23	0	127 mm	Ok	Manassas in April
May	24° / 13°	9	22	0	160 mm	Good	Manassas in May
June	29° / 17°	6	24	0	129 mm	Good	Manassas in June
July	32° / 20°	6	25	0	132 mm	Good	Manassas in July
August	31° / 19°	6	25	0	129 mm	Good	Manassas in August
September	27° / 16°	5	25	0	113 mm	Perfect	Manassas in September
October	20° / 10°	5	26	0	130 mm	Good	Manassas in October
November	13° / 4°	5	25	0	95 mm	Ok	Manassas in November
December	8° / 1°	6	21	3	130 mm	Bad	Manassas in December

Temperatures in Manassas in September

Rain in Manassas in September

Weather in Manassas in September - FAQ

What is the average temperature in Manassas in September?

The average temperature in Manassas in September is 16/27° C.

What is the chance of rain in Manassas in September?

On average, there are 5 rainy days in Manassas during September.

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

The weather in Manassas in September is perfect.

Can it snow in Manassas in September?

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

More about the weather in Manassas