September weather forecast
Stinson Beach, CA

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Weather in September

September, the first month of the autumn in Stinson Beach, is still a pleasant month, with an average temperature ranging between max 70.9°F (21.6°C) and min 56.3°F (13.5°C).

Temperature

September, on average, is the warmest month, registering a high temperature of 70.9°F (21.6°C) and a low of 56.3°F (13.5°C).

Humidity

In September, the average relative humidity is 73%.

Rainfall

In Stinson Beach, California, during September, the rain falls for 3.4 days and regularly aggregates up to 0.12" (3mm) of precipitation. In Stinson Beach, California, during the entire year, the rain falls for 80.3 days and collects up to 15.98" (406mm) of precipitation.

Snowfall

January through November are months without snowfall in Stinson Beach.

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of the month, sunrise is at 6:41 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:06 am and sunset at 6:54 pm PDT.

Sunshine

In September, the average sunshine is 10.5h.

UV index

The months with the highest UV index are June through September, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Make use of precautions - Shielding skin and eyes from injury is a requirement. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Experience reduced UV exposure by about half when donning a wide-brim hat.
Updated: Jul 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the warmest months?

September is Stinson Beach's warmest month, registering average high temperatures of 70.9°F (21.6°C) and lows of 56.3°F (13.5°C).

What is the temperature in September?

The high-temperature, in September, in Stinson Beach, is 70.9°F (21.6°C), while the low-temperature averages to 56.3°F (13.5°C).

What is the average humidity in September?

The average relative humidity in September in Stinson Beach is 73%.

How many days does it rain in September in Stinson Beach?

In September, the rain falls for 3.4 days. Throughout September, 0.12" (3mm) of precipitation is accumulated.

When it does not snow?

In Stinson Beach, snow does not fall in January through November.

How many hours of daylight does Stinson Beach have in September?

The average day length in September in Stinson Beach is 12h and 25min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:41 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:54 pm PDT.

How long on average sun shines in September?

In Stinson Beach, the average sunshine duration in September is 10.5h.

When is the highest UV index?

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

How high is the UV index in September?

The average daily maximum UV index in September in Stinson Beach is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Stinson Beach, CA

Average temperature in September - Stinson Beach, CA
  • Average high temperature in September: 70.9°F

The warmest month (with the highest average high temperature) is September (70.9°F).
The month with the lowest average high temperature is December (55.2°F).

  • Average low temperature in September: 56.3°F

The month with the highest average low temperature is September (56.3°F).
The coldest month (with the lowest average low temperature) is December (46°F).

Average pressure in September
Stinson Beach, CA

Average pressure in September - Stinson Beach, CA
  • Average pressure in September: 29.92"Hg

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

Average wind speed in September
Stinson Beach, CA

Average wind speed in September - Stinson Beach, CA
  • Average wind speed in September: 6.3mph

The windiest months (with the highest average wind speed) are April and May (8.3mph).
The calmest month (with the lowest average wind speed) is November (5.9mph).

Average humidity in September
Stinson Beach, CA

Average humidity in September - Stinson Beach, CA
  • Average humidity in September: 73%

The month with the highest relative humidity is August (78%).
The month with the lowest relative humidity is October (69%).

Average rainfall in September
Stinson Beach, CA

Average rainfall in September - Stinson Beach, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is February (3.43").
The driest months (with the least rainfall) are July and August (0.08").

Average rainfall days in September
Stinson Beach, CA

Average rainfall days in September - Stinson Beach, CA
  • Average rainfall days in September: 3.4 days

The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is July (2.3 days).

Average snowfall days in September
Stinson Beach, CA

Average snowfall days in September - Stinson Beach, CA
  • Average snowfall days in September: 0 days

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

Average daylight in September /
Average sunshine in September
Stinson Beach, CA

Average daylight in September / Average sunshine in September - Stinson Beach, CA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in September: 10h and 3min

The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).

Average sunshine days in September
Stinson Beach, CA

Average sunshine days in September - Stinson Beach, CA
  • Average sunshine days in September: 24.1 days

The months with the most sunshine days are June and July (24.8 days).
The month with the least sunshine days is March (16.6 days).

Average UV index in September
Stinson Beach, CA

Average UV index in September - Stinson Beach, CA
  • Average UV index in September: 5

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

Average cloud cover in September
Stinson Beach, CA

Average cloud cover in September - Stinson Beach, CA
  • Average cloud cover in September: 19

The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is September (Cloud cover 19).

Average visibility in September
Stinson Beach, CA

Average visibility in September - Stinson Beach, 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).

Stinson Beach, California, USA

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