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

September weather forecast and climate
Monterey, CA

The scenic view of the rugged mountainous coast of Big Sur in Monterey, California, under the clear blue sky
The scenic view of the rugged mountainous coast of Big Sur in Monterey, California, under the clear blue sky
September, the first month of the autumn, in Monterey, is a pleasant month, with average temperature fluctuating between 52.9°F (11.6°C) and 69.6°F (20.9°C).

Temperature

The warmest month is September, with an average high-temperature of 69.6°F (20.9°C) and an average low-temperature of 52.9°F (11.6°C).

Rainfall

In September, in Monterey, the rain falls for 2 days. Throughout September, 0.2" (6.1mm) of precipitation is accumulated. In Monterey, during the entire year, the rain falls for 71 days and collects up to 21.1" (536mm) of precipitation.

Ocean temperature

Months with the warmest seawater are August and September, with an average ocean temperature of 58.1°F (14.5°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

The average length of the day in September is 12.4h.

What is the warmest month in Monterey?

September is the warmest month in Monterey, California, with an average high-temperature of 69.6°F (20.9°C) and an average low-temperature of 52.9°F (11.6°C).

What is the temperature in September in Monterey?

The average high-temperature, in September, in Monterey, is 69.6°F (20.9°C), while the average low-temperature is 52.9°F (11.6°C).

How many days does it rain in September in Monterey?

In Monterey, in September, it is raining for 2 days, with typically 0.2" (6.1mm) of accumulated precipitation.

What months are the ocean warmest in Monterey?

August and September, with an average ocean temperature of 58.1°F (14.5°C), are months with the warmest seawater.

What is the water temperature in September in Monterey?

In September, the average ocean temperature in Monterey is 58.1°F (14.5°C). Swimming in 58.1°F (14.5°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 Monterey?

In Monterey, the average length of the day in September is 12.4h.
Average temperature in September - Monterey, CA
  • Average high temperature in September: 69.6°F

The warmest month (with the highest average high temperature) is September (69.6°F).
The month with the lowest average high temperature is December (57.8°F).

  • Average low temperature in September: 52.8°F

The month with the highest average low temperature is August (53.1°F).
The coldest month (with the lowest average low temperature) is January (43.7°F).

Average rainfall in September - Monterey, CA
  • Average rainfall in September: 0.2"

The wettest month (with the highest rainfall) is January (4.4").
Driest months (with the lowest rainfall) are July and August (0.1").

Average rainfall days in September - Monterey, CA
  • Average rainfall days in September: 2 days

The month with the highest number of rainy days is January (11 days).
Months with the lowest number of rainy days are July, August and September (2 days).

Average sea temperature in September - Monterey, CA
  • Average sea temperature in September: 58.1°F

Best months for swimming (with the highest average sea temperature) are August and September (58.1°F).
The coldest month (with the lowest average sea temperature) is April (53.8°F).

Average daylight in September - Monterey, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.6h).
The month with shortest days is December (Average daylight: 9.7h).