September weather forecast
Manchester, WA

Weather in September

September, the first month of the autumn, in Manchester, is also an agreeable month, with average temperature varying between 70°F (21.1°C) and 50.9°F (10.5°C).

Temperature

In Manchester, the average high-temperature marginally drops, from a moderately hot 77.2°F (25.1°C) in August, to a pleasant 70°F (21.1°C). The average low-temperature, in Manchester, Washington, is 50.9°F (10.5°C).

Humidity

In Manchester, the average relative humidity is 75%.

Rainfall

In Manchester, it is raining for 9.9 days, with typically 0.59" (15mm) of accumulated precipitation. In Manchester, during the entire year, the rain falls for 138.9 days and collects up to 12.24" (311mm) of precipitation.

Snowfall

April through October are months without snowfall in Manchester, Washington.

Ocean temperature

August and September, with an average ocean temperature of 53.2°F (11.8°C), are months with the warmest seawater in Manchester.
Note: Swimming in 53.2°F (11.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

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

Sunshine

In Manchester, the average sunshine is 9.3h.

UV index

In Manchester, Washington, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the average humidity in September in Manchester?

In Manchester, the average relative humidity in September is 75%.

How much does it rain in Manchester in September?

In Manchester, Washington, in September, it is raining for 9.9 days, with typically 0.59" (15mm) of accumulated precipitation.

When it does not snow in Manchester?

April through October are months without snowfall in Manchester, Washington.

What are the months with the warmest ocean in Manchester?

August and September, with an average ocean temperature of 53.2°F (11.8°C), are months with the warmest seawater in Manchester.

What is the water temperature in September in Manchester?

In September, the average ocean temperature in Manchester, Washington, is 53.2°F (11.8°C). Swimming in 53.2°F (11.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Manchester have in September?

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

How many hours of sunshine does Manchester have in September?

In September, the average sunshine in Manchester, Washington, is 9.3h.

What is the UV index reading in September in Manchester?

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

Average temperature in September
Manchester, WA

Average temperature in September - Manchester, WA
  • Average high temperature in September: 70°F

The warmest month (with the highest average high temperature) is August (77.2°F).
The month with the lowest average high temperature is December (43.2°F).

  • Average low temperature in September: 50.9°F

The month with the highest average low temperature is August (53.6°F).
The coldest month (with the lowest average low temperature) is December (34.9°F).

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Average pressure in September
Manchester, WA

Average pressure in September - Manchester, WA
  • Average pressure in September: 30.01"

The month with the highest atmospheric pressure is January (30.09").
Months with the lowest atmospheric pressure are March, August and September (30.01").

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Average wind speed in September
Manchester, WA

Average wind speed in September - Manchester, WA
  • Average wind speed in September: 4.1mph

The windiest month (with the highest average wind speed) is March (5.5mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).

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Average humidity in September
Manchester, WA

Average humidity in September - Manchester, WA
  • Average humidity in September: 75%

The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is July (69%).

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Average rainfall in September
Manchester, WA

Average rainfall in September - Manchester, WA
  • Average rainfall in September: 0.59"

The wettest months (with the highest rainfall) are January and December (2.05").
The driest month (with the least rainfall) is July (0.28").

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Average rainfall days in September
Manchester, WA

Average rainfall days in September - Manchester, WA
  • Average rainfall days in September: 9.9 days

The month with the highest number of rainy days is March (15.3 days).
The month with the least rainy days is August (5.4 days).

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Average snowfall in September
Manchester, WA

Average snowfall in September - Manchester, WA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.22").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Manchester, WA

Average snowfall days in September - Manchester, WA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.8 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in September
Manchester, WA

Average sea temperature in September - Manchester, WA
  • Average sea temperature in September: 53.1°F

The best month for swimming (with the highest average sea temperature) is August (53.2°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).

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

Average daylight in September / Average sunshine in September - Manchester, 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: 8.5h).

  • Average sunshine in September: 9.3h

The month with the most sunshine is August (Average sunshine: 10.7h).
The month with the least sunshine is December (Average sunshine: 4.1h).

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Average sunshine days in September
Manchester, WA

Average sunshine days in September - Manchester, WA
  • Average sunshine days in September: 18.5 days

The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (11.8 days).

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Average UV index in September
Manchester, WA

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

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Manchester, WA

Average cloud cover in September - Manchester, WA
  • Average cloud cover in September: 34

The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 25).

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Average visibility in September
Manchester, WA

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

Months with the highest visibility are May, June, July, August and September (6mi).
Months with the lowest visibility are January, February, March, April, October, November and December (5mi).

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