The temperatures in Mount Vernon 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 Mount Vernon 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 Mount Vernon in September 2025.
If you’re planning to visit Mount Vernon in the near future, we highly recommend that you review the 14 day weather forecast for Mount Vernon before you arrive.
Temperatures
25° / 17°
Rainy Days
5
Snowy Days
0
Dry Days
25
Rainfall
132
mm
Sun Hours
10.2
Hrs