September weather forecast and climate
Monterey, CA

The rugged mountainous coast of Big Sur in Monterey, California
The rugged mountainous coast of Big Sur in Monterey, California

Weather in September

The first month of the autumn, September, is still a pleasant month in Monterey, California, with average temperature varying between 55.2°F (12.9°C) and 72.5°F (22.5°C).

Temperature

September is the warmest month, with an average high-temperature of 72.5°F (22.5°C) and an average low-temperature of 55.2°F (12.9°C).

Humidity

In Monterey, the average relative humidity is 72%.

Rainfall

In Monterey, California, it is raining for 2.4 days, with typically 0.12" (3mm) of accumulated precipitation. Throughout the year, in Monterey, there are 73.6 rainfall days, and 11.77" (299mm) of precipitation is accumulated.

Ocean temperature

Months with the warmest seawater in Monterey are August and September, with an average ocean temperature of 58.1°F (14.5°C).
Note: Swimming in 58.1°F (14.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

In September, the average length of the day in Monterey, California, is 12.4h.

Sunshine

The average sunshine is 11.1h.

UV index

Months with the highest UV index in Monterey are June through September, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the warmest month in Monterey?

With an average high-temperature of 72.5°F (22.5°C) and an average low-temperature of 55.2°F (12.9°C), September is the warmest month in Monterey, California.

What is the temperature in September in Monterey?

The average high-temperature, in September, in Monterey, is 72.5°F (22.5°C), while the average low-temperature is 55.2°F (12.9°C).

What is the average humidity in September in Monterey?

In Monterey, California, the average relative humidity in September is 72%.

How many days does it rain in September in Monterey?

In Monterey, during September, the rain falls for 2.4 days and regularly aggregates up to 0.12" (3mm) of 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 in Monterey, California.

How cold is the water in September in Monterey?

In Monterey, California, in September, the average water temperature is 58.1°F (14.5°C). 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.

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

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

How long on average sun shines in September in Monterey?

The average sunshine in September is 11.1h.

When is the highest UV index in Monterey?

June through September, with an average maximum UV index of 5, are months with the highest UV index in Monterey, California.

What is the UV index reading in September in Monterey?

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Monterey, CA

Average temperature in September - Monterey, CA
  • Average high temperature in September: 72.5°F

The warmest month (with the highest average high temperature) is September (72.5°F).
The month with the lowest average high temperature is December (57.2°F).

  • Average low temperature in September: 55.2°F

Months with the highest average low temperature are August and September (55.2°F).
The coldest month (with the lowest average low temperature) is February (46°F).

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Average pressure in September
Monterey, CA

Average pressure in September - Monterey, CA
  • Average pressure in September: 29.92"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is September (29.92").

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Average wind speed in September
Monterey, CA

Average wind speed in September - Monterey, CA
  • Average wind speed in September: 5.7mph

The windiest months (with the highest average wind speed) are April and May (7.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in September
Monterey, CA

Average humidity in September - Monterey, CA
  • Average humidity in September: 72%

Months with the highest relative humidity are March and May (76%).
The month with the lowest relative humidity is November (68%).

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Average rainfall in September
Monterey, CA

Average rainfall in September - Monterey, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is December (2.4").
The driest months (with the least rainfall) are July and August (0.08").

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Average rainfall days in September
Monterey, CA

Average rainfall days in September - Monterey, CA
  • Average rainfall days in September: 2.4 days

The month with the highest number of rainy days is March (12.5 days).
The month with the least rainy days is August (1.1 days).

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Average sea temperature in September
Monterey, CA

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

The 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).

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Average daylight in September /
Average sunshine in September
Monterey, CA

Average daylight in September / Average sunshine 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 the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 11.1h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average sunshine days in September
Monterey, CA

Average sunshine days in September - Monterey, CA
  • Average sunshine days in September: 25.9 days

The month with the most sunshine days is July (27.3 days).
The month with the least sunshine days is March (16.8 days).

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Average UV index in September
Monterey, CA

Average UV index in September - Monterey, CA
  • Average UV index in September: 5

Months with the highest UV index are June, July, August and September (UV index 5).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in September
Monterey, CA

Average cloud cover in September - Monterey, CA
  • Average cloud cover in September: 12

The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 9).

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Average visibility in September
Monterey, CA

Average visibility in September - Monterey, CA
  • Average visibility in September: 6mi

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

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