September weather forecast and climate
Quincy, WA

Weather in September

The first month of the autumn, September, is still a warm month in Quincy, Washington, with temperature in the range of an average high of 74.3°F (23.5°C) and an average low of 53.2°F (11.8°C).

Temperature

In September, the average high-temperature drops, from a tropical 86.2°F (30.1°C) in August, to a warm 74.3°F (23.5°C). In Quincy, the average low-temperature is 53.2°F (11.8°C).

Humidity

In Quincy, Washington, the average relative humidity is 46%.

Rainfall

In Quincy, during 4.9 rainfall days, 0.35" (9mm) of precipitation is typically accumulated. Throughout the year, in Quincy, there are 100.6 rainfall days, and 7.87" (200mm) of precipitation is accumulated.

Snowfall

January through April, September, November and December are months with snowfall in Quincy. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 25.2 snowfall days, and 12.56" (319mm) of snow is accumulated.

Daylight

In Quincy, the average length of the day is 12.5h.

Sunshine

The average sunshine in September is 10.8h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in September in Quincy?

The average relative humidity in September in Quincy, Washington, is 46%.

How much does it rain in Quincy in September?

In Quincy, during September, the rain falls for 4.9 days and regularly aggregates up to 0.35" (9mm) of precipitation.

When does it start snowing in Quincy?

September is the first month it typically snows in Quincy, Washington. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow.

How many hours of daylight does Quincy have in September?

In September, the average length of the day is 12.5h.

How many hours of sunshine does Quincy have in September?

The average sunshine in September in Quincy is 10.8h.

How high is the UV index in September in Quincy?

In September, the average daily maximum UV index in Quincy is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Quincy, WA

Average temperature in September - Quincy, WA
  • Average high temperature in September: 74.3°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is December (33.4°F).

  • Average low temperature in September: 53.2°F

The month with the highest average low temperature is August (60.4°F).
The coldest month (with the lowest average low temperature) is December (22.6°F).

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Average pressure in September
Quincy, WA

Average pressure in September - Quincy, WA
  • Average pressure in September: 29.96"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is August (29.92").

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Average wind speed in September
Quincy, WA

Average wind speed in September - Quincy, WA
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is December (4.5mph).

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Average humidity in September
Quincy, WA

Average humidity in September - Quincy, WA
  • Average humidity in September: 46%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (38%).

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Average rainfall in September
Quincy, WA

Average rainfall in September - Quincy, WA
  • Average rainfall in September: 0.35"

The wettest month (with the highest rainfall) is December (1.1").
The driest month (with the least rainfall) is August (0.24").

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Average rainfall days in September
Quincy, WA

Average rainfall days in September - Quincy, WA
  • Average rainfall days in September: 4.9 days

The month with the highest number of rainy days is March (13.1 days).
The month with the least rainy days is July (3.9 days).

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Average snowfall in September
Quincy, WA

Average snowfall in September - Quincy, WA
  • Average snowfall in September: 0.08"

The month with the highest snowfall is December (4.45").
Months with the least snowfall are May, June, July, August and October (0").

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Average snowfall days in September
Quincy, WA

Average snowfall days in September - Quincy, WA
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is December (8.1 days).
Months with the least snowfall days are May, June, July, August and October (0 days).

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Average daylight in September /
Average sunshine in September
Quincy, WA

Average daylight in September / Average sunshine in September - Quincy, WA
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in September: 10.8h

The month with the most sunshine is August (Average sunshine: 12.1h).
The month with the least sunshine is January (Average sunshine: 4.8h).

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Average sunshine days in September
Quincy, WA

Average sunshine days in September - Quincy, WA
  • Average sunshine days in September: 23.6 days

The month with the most sunshine days is July (26 days).
The month with the least sunshine days is February (14.3 days).

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Average UV index in September
Quincy, WA

Average UV index in September - Quincy, WA
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Quincy, WA

Average cloud cover in September - Quincy, WA
  • Average cloud cover in September: 17

The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 10).

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Average visibility in September
Quincy, WA

Average visibility in September - Quincy, WA
  • Average visibility in September: 6mi

Months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).

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