Astoria
Oregon, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Astoria, OR

A scenic seaside shot of the city of Astoria in Oregon, with a view of the iconic Astoria Megler bridge crossing over the Columbia River
A scenic seaside shot of the city of Astoria in Oregon, with a view of the iconic Astoria Megler bridge crossing over the Columbia River
September, the first month of the autumn, in Astoria, is still a comfortable month, with average temperature varying between 67.6°F (19.8°C) and 49.5°F (9.7°C).

Temperature

In Astoria, the average high-temperature is almost the same as in August - an enjoyable 67.6°F (19.8°C). In September, the average low-temperature is 49.5°F (9.7°C).

Rainfall

In Astoria, during September, the rain falls for 9.4 days and regularly aggregates up to 2.1" (54.4mm) of precipitation. Throughout the year, in Astoria, there are 191.1 rainfall days, and 67.2" (1708.1mm) of precipitation is accumulated.

Snowfall

In Astoria, during the entire year, snow aggregates up to 1.1" (27.9mm).

Ocean temperature

In Astoria, Oregon, the average seawater temperature is 55.9°F (13.3°C). Swimming in 55.9°F (13.3°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

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

Sunshine

In Astoria, Oregon, the average sunshine is 7h.

UV index

In Astoria, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV radiation for average individuals.
The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. 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.

What is the temperature in September in Astoria?

The average high-temperature, in September, is 67.6°F (19.8°C), while the average low-temperature is 49.5°F (9.7°C).

How much does it rain in Astoria in September?

In Astoria, Oregon, in September, it is raining for 9.4 days, with typically 2.1" (54.4mm) of accumulated precipitation.

What is the ocean temperature in September in Astoria?

In Astoria, the average seawater temperature in September is 55.9°F (13.3°C). Swimming in 55.9°F (13.3°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the average length of the day in September in Astoria?

The average length of the day in September in Astoria is 12.5h.

How many hours of sunshine does Astoria have in September?

In Astoria, the average sunshine in September is 7h.

How high is the UV index in September in Astoria?

In September, the average daily maximum UV index in Astoria, Oregon, is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.
Average temperature in September - Astoria, OR
  • Average high temperature in September: 67.6°F

The warmest month (with the highest average high temperature) is August (68.7°F).
The month with the lowest average high temperature is December (48.7°F).

  • Average low temperature in September: 49.4°F

Months with the highest average low temperature are July and August (53.1°F).
The coldest month (with the lowest average low temperature) is December (36.6°F).

Average rainfall in September - Astoria, OR
  • Average rainfall in September: 2.1"

The wettest month (with the highest rainfall) is November (11.2").
The driest month (with the lowest rainfall) is July (1").

Average rainfall days in September - Astoria, OR
  • Average rainfall days in September: 9.4 days

Months with the highest number of rainy days are January and November (21.4 days).
The month with the lowest number of rainy days is August (7.4 days).

Average snowfall in September - Astoria, OR
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.5").
Months with the lowest snowfall are March, April, May, June, July, August, September and October (0").

Average snowfall days in September - Astoria, OR
  • Average snowfall days in September: 0 days

Months with the highest number of snowfall days are January and February (0.4 days).
Months with the lowest number of snowfall days are March, April, May, June, July, August, September and October (0 days).

Average sea temperature in September - Astoria, OR
  • Average sea temperature in September: 55.9°F

The best month for swimming (with the highest average sea temperature) is July (56.9°F).
The coldest month (with the lowest average sea temperature) is February (47.7°F).

Average daylight in September / Average sunshine in September - Astoria, OR
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.7h).
The month with shortest days is December (Average daylight: 8.7h).

  • Average sunshine in September: 7h

The month with most sunshine is July (Average sunshine: 9h).
Months with least sunshine are November and December (Average sunshine: 2).

Average UV index in September - Astoria, OR
  • Average UV index in September: 5

The month with the highest UV index is July (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).