Mount Vernon Weather in September

Mount Vernon in September sees pleasant temperatures, with highs around 20°C (68°F) and overnight lows of 10°C (50°F). Rainfall is fairly high at around 63 mm (2.5 in) on average, so pack waterproofs just in case.

Rainfall in Mount Vernon in September

On average, there are about 12 days with rain during this month, averaging 63 mm (2.5 in). Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Mount Vernon in September

The temperature in Mount Vernon in September is perfect. Daytime highs reach 20°C (68°F), with nights dropping to 10°C (50°F). The summer season takes place during September. The difference between afternoon and evening temperatures is usually noticeable. Nights fall to 10°C (50°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Mount Vernon in September

The month brings about 188 hours of sunlight, offering a comfortable mix of sun and overcast.

If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Mount Vernon.

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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 Mount Vernon's climate page.

Mount Vernon Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 20°C (68°F)  

Chance of Rain 40%  

Precipitation 63 mm (2.5 in)  

Rainy days 12 days  

Sunshine 188 hours *  

Percentage Sunshine *  

* Data from: Bellingham, the United States of America (38 KM, 24 Miles).

What to Wear in Mount Vernon in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Mount Vernon in September

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

Swimming

6/10

Cycling

10/10

Walking

10/10

Camping

4/10

Outdoor sports

10/10

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 Mount Vernon's climate page.

More climate data for Mount Vernon

Temperature Rainfall Sunshine

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