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.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Manassas's climate page.

Manassas Temperature in September

Min Temperature 15°C (59°F)  

Max Temperature 27°C (81°F)  

Chance of Rain 30%  

Precipitation 116 mm (4.6 in)  

Rainy days 9 days  

Humidity 68% *  

Sunshine 225 hours *  

Percentage Sunshine 60% *  

* Data from: Washington DC, the United States of America (39 KM, 24 Miles).

What to Wear in Manassas in September

Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Manassas in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Manassas's climate page.

More climate data for Manassas

Temperature Rainfall Sunshine Humidity

See the full Manassas climate overview or explore weather in the United States of America.