September weather forecast
Long Beach, WA

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Weather in September

The first month of the autumn, September, is also an enjoyable month in Long Beach, Washington, with an average temperature ranging between min 55°F (12.8°C) and max 62.6°F (17°C).

Temperature

Long Beach's entry into September measures an average high-temperature of a still enjoyable 62.6°F (17°C), closely parallel to the preceding month. Long Beach's September nights demonstrate minimal variation from the daytime temperatures, with an average of 55°F (12.8°C).

Humidity

In September, the average relative humidity in Long Beach is 83%.

Rainfall

In Long Beach, in September, during 9.9 rainfall days, 0.94" (24mm) of precipitation is typically accumulated. In Long Beach, during the entire year, the rain falls for 165.1 days and collects up to 19.92" (506mm) of precipitation.

Snowfall

Months with snowfall in Long Beach are January, February and September. September is the first month it typically snows in Long Beach. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Long Beach, Washington, during the entire year, snow falls for 1.8 days and aggregates up to 0.47" (12mm) of snow.

Ocean temperature

In September, the average ocean temperature is 56.8°F (13.8°C).
Note: With an efficient thermal swimsuit, one can navigate 56.8°F (13.8°C) even if it's colder than 50°F (10°C); otherwise, rapid cold shock and breathlessness might set in. Barely wading at 55.4°F (13°C) feels chilly.

Daylight

In September, the average length of the day is 12h and 32min.
On the first day of September, sunrise is at 6:37 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 6:57 pm PDT.

Sunshine

The average sunshine in September in Long Beach is 8.7h.

UV index

May through September, with an average maximum UV index of 4, are months with the highest UV index in Long Beach. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The maximum UV index of 4 during September translates into these guidelines:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature in Long Beach?

The high-temperature, in September, in Long Beach, records 62.6°F (17°C), while the low-temperature is 55°F (12.8°C).

What is the average humidity in September in Long Beach?

In September, the average relative humidity in Long Beach, Washington, is 83%.

How many days does it rain in September in Long Beach?

In September, the rain falls for 9.9 days. Throughout September, 0.94" (24mm) of precipitation is accumulated.

When does it start to snow in Long Beach?

September is the first month it typically snows in Long Beach, Washington. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

What is the water temperature in September in Long Beach?

In September, the average ocean temperature is 56.8°F (13.8°C). Swimming in 56.8°F (13.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in September in Long Beach?

In Long Beach, the average day length in September is 12h and 32min.

When are sunrise and sunset in September in Long Beach?

On the first day of September in Long Beach, Washington, sunrise is at 6:37 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 6:57 pm PDT.

How many hours of sunshine does Long Beach have in September?

The average sunshine duration in September is 8.7h.

When is the highest UV index in Long Beach?

May through September, with an average maximum UV index of 4, are months with the highest UV index in Long Beach, Washington.

What is the UV index reading in September in Long Beach?

In Long Beach, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Long Beach, WA

Average temperature in September - Long Beach, WA
  • Average high temperature in September: 62.6°F

The warmest month (with the highest average high temperature) is August (63.9°F).
The month with the lowest average high temperature is December (46.8°F).

  • Average low temperature in September: 55°F

The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (41.5°F).

Average pressure in September
Long Beach, WA

Average pressure in September - Long Beach, WA
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is July (30.08"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).

Average wind speed in September
Long Beach, WA

Average wind speed in September - Long Beach, WA
  • Average wind speed in September: 7.8mph

The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (7.1mph).

Average humidity in September
Long Beach, WA

Average humidity in September - Long Beach, WA
  • Average humidity in September: 83%

The month with the highest relative humidity is August (86%).
The month with the lowest relative humidity is April (80%).

Average rainfall in September
Long Beach, WA

Average rainfall in September - Long Beach, WA
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is December (3.31").
The driest month (with the least rainfall) is July (0.35").

Average rainfall days in September
Long Beach, WA

Average rainfall days in September - Long Beach, WA
  • Average rainfall days in September: 9.9 days

The month with the highest number of rainy days is November (18.5 days).
The month with the least rainy days is August (6.7 days).

Average snowfall in September
Long Beach, WA

Average snowfall in September - Long Beach, WA
  • Average snowfall in September: 0.04"

The month with the highest snowfall is February (0.31").
The months with the least snowfall are March, April, May, June, July, August, October, November and December (0").

Average snowfall days in September
Long Beach, WA

Average snowfall days in September - Long Beach, WA
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (0.8 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).

Average sea temperature in September
Long Beach, WA

Average sea temperature in September - Long Beach, WA
  • Average sea temperature in September: 56.8°F

The best month for swimming (with the highest average sea temperature) is July (58.6°F).
The coldest month (with the lowest average sea temperature) is February (47.8°F).

Average daylight in September /
Average sunshine in September
Long Beach, WA

Average daylight in September / Average sunshine in September - Long Beach, WA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in September
Long Beach, WA

Average sunshine days in September - Long Beach, WA
  • Average sunshine days in September: 17.1 days

The month with the most sunshine days is August (20.3 days).
The month with the least sunshine days is November (8.9 days).

Average UV index in September
Long Beach, WA

Average UV index in September - Long Beach, WA
  • Average UV index in September: 4

The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are February, November and December (UV index 2).

Average cloud cover in September
Long Beach, WA

Average cloud cover in September - Long Beach, WA
  • Average cloud cover in September: 37

The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 37).

Average visibility in September
Long Beach, WA

Average visibility in September - Long Beach, WA
  • Average visibility in September: 6mi

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

Long Beach, Washington, USA

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