September weather forecast and climate
Mendocino, CA

Weather in September

September, the first month of the autumn, in Mendocino, is still a comfortable month, with average temperature ranging between max 67.5°F (19.7°C) and min 54.9°F (12.7°C).

Temperature

The warmest month is September, with an average high-temperature of 67.5°F (19.7°C) and an average low-temperature of 54.9°F (12.7°C).

Humidity

In September, the average relative humidity is 76%.

Rainfall

In Mendocino, California, in September, it is raining for 2.1 days, with typically 0.16" (4mm) of accumulated precipitation. In Mendocino, during the entire year, the rain falls for 68.4 days and collects up to 9.53" (242mm) of precipitation.

Snowfall

January, March through December are months without snowfall.

Ocean temperature

In September, the average ocean temperature in Mendocino is 54.9°F (12.7°C).
Note: Swimming in 54.9°F (12.7°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 September, the average length of the day in Mendocino is 12.4h.

Sunshine

The average sunshine in Mendocino is 10.7h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the warmest month in Mendocino?

September is the warmest month in Mendocino, with an average high-temperature of 67.5°F (19.7°C) and an average low-temperature of 54.9°F (12.7°C).

What is the temperature in September in Mendocino?

In September, in Mendocino, California, the average high-temperature is 67.5°F (19.7°C), and the average low-temperature is 54.9°F (12.7°C).

What is the average humidity in September in Mendocino?

In September, the average relative humidity in Mendocino, California, is 76%.

How many days does it rain in September in Mendocino?

In September, in Mendocino, the rain falls for 2.1 days. Throughout September, 0.16" (4mm) of precipitation is accumulated.

When it does not snow in Mendocino?

January, March through December are months without snowfall in Mendocino.

What is the ocean temperature in September in Mendocino?

In Mendocino, in September, the average water temperature is 54.9°F (12.7°C). Swimming in 54.9°F (12.7°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 Mendocino have in September?

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

How long on average sun shines in September in Mendocino?

In Mendocino, California, the average sunshine in September is 10.7h.

How high is the UV index in September in Mendocino?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.

Average temperature in September
Mendocino, CA

Average temperature in September - Mendocino, CA
  • Average high temperature in September: 67.5°F

The warmest month (with the highest average high temperature) is September (67.5°F).
Months with the lowest average high temperature are February and December (54.3°F).

  • Average low temperature in September: 54.9°F

The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is February (45.5°F).

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Average pressure in September
Mendocino, CA

Average pressure in September - Mendocino, CA
  • Average pressure in September: 29.94"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is August (29.93").

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Average wind speed in September
Mendocino, CA

Average wind speed in September - Mendocino, CA
  • Average wind speed in September: 8.3mph

The windiest month (with the highest average wind speed) is June (10.9mph).
The calmest month (with the lowest average wind speed) is August (7.8mph).

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Average humidity in September
Mendocino, CA

Average humidity in September - Mendocino, CA
  • Average humidity in September: 76%

Months with the highest relative humidity are March, May and August (80%).
The month with the lowest relative humidity is October (75%).

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Average rainfall in September
Mendocino, CA

Average rainfall in September - Mendocino, CA
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is December (1.77").
The driest months (with the least rainfall) are June, July and August (0.08").

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Average rainfall days in September
Mendocino, CA

Average rainfall days in September - Mendocino, CA
  • Average rainfall days in September: 2.1 days

The month with the highest number of rainy days is March (11.4 days).
Months with the least rainy days are June and August (1.8 days).

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Average snowfall in September
Mendocino, CA

Average snowfall in September - Mendocino, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.04").
Months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Mendocino, CA

Average snowfall days in September - Mendocino, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.1 days).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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Average sea temperature in September
Mendocino, CA

Average sea temperature in September - Mendocino, CA
  • Average sea temperature in September: 54.8°F

The best month for swimming (with the highest average sea temperature) is October (55.6°F).
The coldest month (with the lowest average sea temperature) is April (52.1°F).

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

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

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 10.7h

Months with the most sunshine are July and August (Average sunshine: 11.8h).
The month with the least sunshine is December (Average sunshine: 5.5h).

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Average sunshine days in September
Mendocino, CA

Average sunshine days in September - Mendocino, CA
  • Average sunshine days in September: 27.7 days

The month with the most sunshine days is July (28.2 days).
The month with the least sunshine days is March (18.4 days).

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Average UV index in September
Mendocino, CA

Average UV index in September - Mendocino, CA
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (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
Mendocino, CA

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

The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 10).

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Average visibility in September
Mendocino, CA

Average visibility in September - Mendocino, 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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