September weather forecast
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

September, the first month of the autumn in Monterey, is also an agreeable month, with an average temperature fluctuating between 72.5°F (22.5°C) and 55.2°F (12.9°C).

Temperature

The warmest month is September, 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 in September is 72%.

Rainfall

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

Ocean temperature

The 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

In Monterey, the average length of the day in September is 12h and 24min.
On the first day of September in Monterey, sunrise is at 6:38 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:53 pm PDT.

Sunshine

In Monterey, the average sunshine in September is 11.1h.

UV index

The 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 moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the 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?

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).

What is the temperature in September in Monterey?

The average high-temperature, in September, in Monterey, California, 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 September, the average relative humidity in Monterey is 72%.

How much does it rain in Monterey in September?

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

How many hours of daylight does Monterey have in September?

The average day length in September in Monterey is 12h and 24min.

When are sunrise and sunset in September in Monterey?

In September, on the first day of the month, sunrise is at 6:38 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:53 pm PDT.

How many hours of sunshine does Monterey have in September?

In September, the average sunshine duration in Monterey, California, is 11.1h.

When is the highest UV index in Monterey?

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

How high is the UV index in September in Monterey?

The average daily maximum UV index in September in Monterey is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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

The 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"Hg

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

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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%

The 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: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in September: 11h and 1min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

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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

The 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

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

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