Oceanside
California, USA
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Oceanside, CA

An evening panoramic view of people on the clean beach of Oceanside City in California, with buildings and palm trees with sun rays and a cloudy sky
An evening panoramic view of people on the clean beach of Oceanside City in California, with buildings and palm trees with sun rays and a cloudy sky
January, the same as December, is another comfortable winter month in Oceanside, California, with average temperature varying between 45°F (7.2°C) and 64°F (17.8°C).

Temperature

The coldest months are January, February and December, with an average high-temperature of 64°F (17.8°C).

Rainfall

January is the month with the most rainfall, with 2.4" (61.5mm) of accumulated precipitation.

Ocean temperature

Months with the coldest seawater are January and February, with an average ocean temperature of 58.6°F (14.8°C).
Note: Swimming in 58.6°F (14.8°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.

Daylight

In Oceanside, the average length of the day in January is 10.3h.

What are the coldest months in Oceanside?

January, February and December, with an average high-temperature of 64°F (17.8°C), are the coldest months.

What is the temperature in January in Oceanside?

In January, the average high-temperature is 64°F (17.8°C), and the average low-temperature is 45°F (7.2°C).

How much does it rain in Oceanside in January?

During January, Oceanside regularly aggregates up to 2.4" (61.5mm) of precipitation.

What is the rainiest month in Oceanside?

January is the month with the most rainfall in Oceanside, California, with 2.4" (61.5mm) of accumulated precipitation.

What are the months with the coldest ocean in Oceanside?

January and February, with an average ocean temperature of 58.6°F (14.8°C), are months with the coldest seawater in Oceanside.

How cold is the water in January in Oceanside?

In January, the average ocean temperature in Oceanside, California, is 58.6°F (14.8°C). Swimming in 58.6°F (14.8°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.

How many hours of daylight does Oceanside have in January?

The average length of the day in January in Oceanside, California, is 10.3h.
Average temperature in January - Oceanside, CA
  • Average high temperature in January: 64°F

The warmest month (with the highest average high temperature) is July (73.9°F).
Months with the lowest average high temperature are January, February and December (64°F).

  • Average low temperature in January: 45°F

The month with the highest average low temperature is July (64°F).
Coldest months (with the lowest average low temperature) are January and December (45°F).

Average rainfall in January - Oceanside, CA
  • Average rainfall in January: 2.4"

The wettest month (with the highest rainfall) is January (2.4").
The driest month (with the lowest rainfall) is July (0").

Average sea temperature in January - Oceanside, CA
  • Average sea temperature in January: 58.7°F

The best month for swimming (with the highest average sea temperature) is August (68°F).
Coldest months (with the lowest average sea temperature) are January and February (58.7°F).

Average daylight in January - Oceanside, CA
  • Average daylight in January: 10.3h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).