Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September, with its average high-temperature of 70.9°F (21.6°C) and an average low-temperature of 56.3°F (13.5°C), holds the record as the warmest month.Humidity
In September, the average relative humidity is 73%.Rainfall
In Bolinas, in September, during 3.4 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. In Bolinas, 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.Ocean temperature
September is the month with the warmest seawater, with an average ocean temperature of 56.8°F (13.8°C).Note: Swimming in 56.8°F (13.8°C) can be lethal. Merely spending a few minutes in 55.4°F (13°C) waters feels harsh, and venturing below 50°F (10°C) might disrupt breathing control and bring about cold shock, contingent on individual resilience.
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 in Bolinas 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 moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 5 in September translates into these instructions:
Undertake precautions - It is suggested to shield oneself from sunburn. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the hottest?
What is the usual temperature for Bolinas in September?
What is the average humidity in September in Bolinas?
How many days does it rain in September in Bolinas?
When it does not snow?
What month is the ocean warmest?
What is the water temperature in September?
How many hours of daylight does Bolinas have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the month with the highest UV index?
What is the UV index reading in September?
Average temperature in September
Bolinas, 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
Bolinas, 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
Bolinas, 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
Bolinas, 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
Bolinas, 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
Bolinas, 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
Bolinas, 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 sea temperature in September
Bolinas, CA
- Average sea temperature in September: 56.9°F
The best month for swimming (with the highest average sea temperature) is September (56.9°F).
The coldest month (with the lowest average sea temperature) is June (52.4°F).
Average daylight in September /
Average sunshine in September
Bolinas, 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
Bolinas, 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
Bolinas, 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
Bolinas, 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
Bolinas, 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).
Bolinas, California, USA
Weather forecast for your location
2. Allow the app to use your location