Mount Vernon
Washington, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Mount Vernon, WA

September, the first month of the autumn, in Mount Vernon, is also an agreeable month, with average temperature varying between 47.5°F (8.6°C) and 69.1°F (20.6°C).

Temperature

In Mount Vernon, Washington, the average high-temperature in September is almost the same as in August - a pleasant 69.1°F (20.6°C). In Mount Vernon, the average low-temperature is 47.5°F (8.6°C).

Rainfall

In Mount Vernon, 1.7" (43.2mm) of precipitation is typically accumulated. During the entire year, Mount Vernon aggregates up to 32.7" (830.7mm) of precipitation.

Daylight

In September, the average length of the day is 12.6h.

What is the temperature in September in Mount Vernon?

In Mount Vernon, in September, the average high-temperature is 69.1°F (20.6°C), and the average low-temperature is 47.5°F (8.6°C).

How much does it rain in Mount Vernon in September?

In Mount Vernon, in September, 1.7" (43.2mm) of precipitation is typically accumulated.

What is the average length of the day in September in Mount Vernon?

In September, the average length of the day is 12.6h.
Average temperature in September - Mount Vernon, WA
  • Average high temperature in September: 69.1°F

The warmest month (with the highest average high temperature) is August (74.1°F).
The month with the lowest average high temperature is January (45.7°F).

  • Average low temperature in September: 47.5°F

The month with the highest average low temperature is August (51.6°F).
The coldest month (with the lowest average low temperature) is January (34.1°F).

Average rainfall in September - Mount Vernon, WA
  • Average rainfall in September: 1.7"

The wettest month (with the highest rainfall) is November (4.8").
The driest month (with the lowest rainfall) is July (1.2").

Average daylight in September - Mount Vernon, WA
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16h).
The month with shortest days is December (Average daylight: 8.4h).