September weather forecast and climate
Sausalito, CA

The colorful waterfront homes and the hilly region over the clear blue water of the ocean, Sausalito, California
The colorful waterfront homes and the hilly region over the clear blue water of the ocean, Sausalito, California

Weather in September

The first month of the autumn, September, is still a pleasant month in Sausalito, California, with average temperature varying between 56.5°F (13.6°C) and 72.3°F (22.4°C).

Temperature

With an average high-temperature of 72.3°F (22.4°C) and an average low-temperature of 56.5°F (13.6°C), September is the warmest month.

Humidity

The average relative humidity in Sausalito is 71%.

Rainfall

June through September are months with the least rain in Sausalito when the rain falls for 2.7 days and typically aggregates up to 0.08" (2mm) of rain.

Ocean temperature

September is the month with the warmest seawater in Sausalito, California, with an average ocean temperature of 57.4°F (14.1°C).
Note: Swimming in 57.4°F (14.1°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 Sausalito is 12.4h.

Sunshine

The average sunshine in September is 10.6h.

UV index

Months with the highest UV index in Sausalito are April, June through September, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the warmest month in Sausalito?

With an average high-temperature of 72.3°F (22.4°C) and an average low-temperature of 56.5°F (13.6°C), September is the warmest month in Sausalito.

What is the temperature in September in Sausalito?

In Sausalito, in September, the average high-temperature is 72.3°F (22.4°C), and the average low-temperature is 56.5°F (13.6°C).

What is the average humidity in September in Sausalito?

The average relative humidity in September in Sausalito, California, is 71%.

How many days does it rain in September in Sausalito?

In September, in Sausalito, California, the rain falls for 2.7 days. Throughout September, 0.08" (2mm) of precipitation is accumulated.

What is the driest month in Sausalito?

June through September are months with the least rain when the rain falls for 2.7 days and typically aggregates up to 0.08" (2mm) of rain.

What month is the ocean warmest in Sausalito?

With an average ocean temperature of 57.4°F (14.1°C), September is the month with the warmest seawater.

What is the water temperature in September in Sausalito?

In September, the average ocean temperature in Sausalito, California, is 57.4°F (14.1°C). Swimming in 57.4°F (14.1°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 Sausalito?

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

How long on average sun shines in September in Sausalito?

In Sausalito, California, the average sunshine in September is 10.6h.

When is the highest UV index in Sausalito?

Months with the highest UV index in Sausalito, California, are April, June through September, with an average maximum UV index of 5.

What is the UV index intensity in September in Sausalito?

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

Average temperature in September
Sausalito, CA

Average temperature in September - Sausalito, CA
  • Average high temperature in September: 72.3°F

The warmest month (with the highest average high temperature) is September (72.3°F).
The month with the lowest average high temperature is December (55.2°F).

  • Average low temperature in September: 56.5°F

The month with the highest average low temperature is September (56.5°F).
The coldest months (with the lowest average low temperature) are January and December (46.2°F).

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Average pressure in September
Sausalito, CA

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

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed in September
Sausalito, CA

Average wind speed in September - Sausalito, CA
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is May (7.9mph).
The calmest months (with the lowest average wind speed) are October and November (5.7mph).

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Average humidity in September
Sausalito, CA

Average humidity in September - Sausalito, CA
  • Average humidity in September: 71%

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

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Average rainfall in September
Sausalito, CA

Average rainfall in September - Sausalito, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is February (0.98").
The driest months (with the least rainfall) are June, July, August and September (0.08").

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Average rainfall days in September
Sausalito, CA

Average rainfall days in September - Sausalito, CA
  • Average rainfall days in September: 2.7 days

The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is June (1.9 days).

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Average sea temperature in September
Sausalito, CA

Average sea temperature in September - Sausalito, CA
  • Average sea temperature in September: 57.3°F

The best month for swimming (with the highest average sea temperature) is September (57.3°F).
The coldest months (with the lowest average sea temperature) are April and June (53°F).

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

Average daylight in September / Average sunshine in September - Sausalito, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 10.6h

The month with the most sunshine is July (Average sunshine: 11.4h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days in September
Sausalito, CA

Average sunshine days in September - Sausalito, CA
  • Average sunshine days in September: 24.5 days

The month with the most sunshine days is October (25 days).
The month with the least sunshine days is March (18.4 days).

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Average UV index in September
Sausalito, CA

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

Months with the highest UV index are April, June, July, August and September (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Sausalito, CA

Average cloud cover in September - Sausalito, CA
  • Average cloud cover in September: 18

The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is September (Cloud cover 18).

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Average visibility in September
Sausalito, CA

Average visibility in September - Sausalito, 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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