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

December weather forecast and climate
Seaside, OR

From atop a high cliff is this view of large rocks in the water on the Seaside shores, Oregon, overlooking the breathtaking sunset view
From atop a high cliff is this view of large rocks in the water on the Seaside shores, Oregon, overlooking the breathtaking sunset view
December, the first month of the winter, in Seaside, is still a cool month, with average temperature fluctuating between 37.2°F (2.9°C) and 51.1°F (10.6°C).

Temperature

With an average high-temperature of 51.1°F (10.6°C) and an average low-temperature of 37.2°F (2.9°C), December is the coldest month.

Rainfall

In Seaside, during December, the rain falls for 19.6 days and regularly aggregates up to 10.6" (268mm) of precipitation. In Seaside, during the entire year, the rain falls for 177.3 days and collects up to 74.4" (1889.3mm) of precipitation.

Ocean temperature

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

Daylight

The month with the shortest days in Seaside is December, with an average of 8.7h of daylight.

What is the coldest month in Seaside?

December is the coldest month in Seaside, Oregon, with an average high-temperature of 51.1°F (10.6°C) and an average low-temperature of 37.2°F (2.9°C).

What is the temperature in December in Seaside?

In Seaside, in December, the average high-temperature is 51.1°F (10.6°C), and the average low-temperature is 37.2°F (2.9°C).

How many days does it rain in December in Seaside?

In Seaside, during December, the rain falls for 19.6 days and regularly aggregates up to 10.6" (268mm) of precipitation.

How cold is the water in December in Seaside?

In Seaside, in December, the average water temperature is 50°F (10°C). Swimming in 50°F (10°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 month with the shortest days in Seaside?

The month with the shortest days is December, with an average of 8.7h of daylight.

How many hours of daylight does Seaside have in December?

In Seaside, Oregon, the average length of the day in December is 8.7h.
Average temperature in December - Seaside, OR
  • Average high temperature in December: 51°F

The warmest month (with the highest average high temperature) is August (67.6°F).
The month with the lowest average high temperature is December (51°F).

  • Average low temperature in December: 37.2°F

Months with the highest average low temperature are July and August (52.5°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).

Average rainfall in December - Seaside, OR
  • Average rainfall in December: 10.6"

The wettest month (with the highest rainfall) is November (11.7").
The driest month (with the lowest rainfall) is August (1.2").

Average rainfall days in December - Seaside, OR
  • Average rainfall days in December: 19.6 days

Months with the highest number of rainy days are January and November (20.4 days).
The month with the lowest number of rainy days is August (6.9 days).

Average sea temperature in December - Seaside, OR
  • Average sea temperature in December: 49.9°F

The best month for swimming (with the highest average sea temperature) is July (57.2°F).
The coldest month (with the lowest average sea temperature) is February (48.1°F).

Average daylight in December - Seaside, OR
  • Average daylight in December: 8.7h

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