Manassas Weather in September

September in Manassas averages 27°C (81°F) during the day and 15°C (59°F) at night. Quite a bit of rainfall is typical this month, with around 116 mm (4.6 in) on average. An umbrella is a good idea.

Rainfall in Manassas in September

Historically, approximately 9 days this month are expected to have rain, averaging 116 mm (4.6 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Manassas in September

Daytime highs in Manassas in September reach 27°C (81°F), with nights around 15°C (59°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights cool down to 15°C (59°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Manassas in September

There are approximately 225 hours of sunshine this month, resulting in mostly clear days.

Should you favor a climate that's both dry and comfortably warm, April typically offers the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.