September weather forecast and climate
Fort Ross, CA

Weather in September

The first month of the autumn, September, is still a warm month in Fort Ross, California, with average temperature fluctuating between 53.4°F (11.9°C) and 79.9°F (26.6°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still warm 79.9°F (26.6°C). In Fort Ross, in September, the average low-temperature is 53.4°F (11.9°C).

Humidity

The least humid month is September, with an average relative humidity of 62%.

Rainfall

In Fort Ross, during 1.9 rainfall days, 0.08" (2mm) of precipitation is typically accumulated. Throughout the year, there are 60.1 rainfall days, and 12.87" (327mm) of precipitation is accumulated.

Daylight

In Fort Ross, the average length of the day is 12.4h.

Sunshine

In September, the average sunshine in Fort Ross is 10.8h.

UV index

In September, the average daily maximum UV index in Fort Ross is 5. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the 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 - 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 temperature in September in Fort Ross?

In September, the average high-temperature is 79.9°F (26.6°C), and the average low-temperature is 53.4°F (11.9°C).

What is the least humid month in Fort Ross?

September is the least humid month in Fort Ross, with an average relative humidity of 62%.

What is the average humidity in September in Fort Ross?

In September, the average relative humidity in Fort Ross is 62%.

How much does it rain in Fort Ross in September?

In Fort Ross, California, in September, during 1.9 rainfall days, 0.08" (2mm) of precipitation is typically accumulated.

How many hours of daylight does Fort Ross have in September?

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

How many hours of sunshine does Fort Ross have in September?

In Fort Ross, the average sunshine in September is 10.8h.

How high is the UV index in September in Fort Ross?

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.

Average temperature in September
Fort Ross, CA

Average temperature in September - Fort Ross, CA
  • Average high temperature in September: 79.9°F

The warmest month (with the highest average high temperature) is August (81°F).
The month with the lowest average high temperature is December (56.3°F).

  • Average low temperature in September: 53.4°F

Months with the highest average low temperature are August and September (53.4°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).

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Average pressure in September
Fort Ross, CA

Average pressure in September - Fort Ross, 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
Fort Ross, CA

Average wind speed in September - Fort Ross, CA
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is May (7.2mph).
The calmest month (with the lowest average wind speed) is November (5mph).

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Average humidity in September
Fort Ross, CA

Average humidity in September - Fort Ross, CA
  • Average humidity in September: 62%

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (62%).

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Average rainfall in September
Fort Ross, CA

Average rainfall in September - Fort Ross, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is February (3.27").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Fort Ross, CA

Average rainfall days in September - Fort Ross, CA
  • Average rainfall days in September: 1.9 days

The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is August (0.9 days).

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Average daylight in September /
Average sunshine in September
Fort Ross, CA

Average daylight in September / Average sunshine in September - Fort Ross, 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: 9.5h).

  • Average sunshine in September: 10.8h

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is December (Average sunshine: 5.4h).

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Average sunshine days in September
Fort Ross, CA

Average sunshine days in September - Fort Ross, CA
  • Average sunshine days in September: 27.9 days

The month with the most sunshine days is July (28.9 days).
The month with the least sunshine days is February (19.9 days).

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Average UV index in September
Fort Ross, CA

Average UV index in September - Fort Ross, CA
  • Average UV index in September: 5

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Fort Ross, CA

Average cloud cover in September - Fort Ross, CA
  • Average cloud cover in September: 12

The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 11).

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Average visibility in September
Fort Ross, CA

Average visibility in September - Fort Ross, 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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