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 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, marked by an average high-temperature of 72.3°F (22.4°C) and a low-temperature of 56.5°F (13.6°C), is the warmest month.Humidity
In September, the average relative humidity is 71%.Rainfall
The months with the least rainfall in Belvedere are June through September Rain falls for 2.7 days and accumulates 0.08" (2mm) of rain.Ocean temperature
With an average ocean temperature of 57.4°F (14.1°C), September is the month with the warmest seawater.Note: One needs to be cautious in 57.4°F (14.1°C) waters. 55.4°F (13°C) is already forbidding, but sub14°F (-10°C) can seriously disrupt your breathing and lead to a frigid shock, considering one's well-being.
Daylight
In September, the average length of the day is 12h and 25min.On the first day of September, sunrise is at 6:40 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:53 pm PDT.
Sunshine
In September, the average sunshine is 10.6h.UV index
April, June through September, with an average maximum UV index of 5, are months with the highest UV index. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: In September, the UV index of 5 transforms into the following advice:
Take precautions - Protection against sun damage is advised. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Frequently asked questions
What is the warmest month in Belvedere?
What are September temperatures in Belvedere?
What is the average humidity in September in Belvedere?
What is the driest month in Belvedere?
How much does it rain in Belvedere in September?
What is the month with the warmest ocean in Belvedere?
What is the ocean temperature in September in Belvedere?
How many hours of daylight does Belvedere have in September?
When are sunrise and sunset in September in Belvedere?
How long on average sun shines in September in Belvedere?
What are the months with the highest UV index in Belvedere?
How high is the UV index in September in Belvedere?
Average temperature in September
Belvedere, 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).
Average pressure in September
Belvedere, 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
Belvedere, 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).
Average humidity in September
Belvedere, CA
- Average humidity in September: 71%
The months with the highest relative humidity are March and August (76%).
The month with the lowest relative humidity is October (68%).
Average rainfall in September
Belvedere, 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").
Average rainfall days in September
Belvedere, 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).
Average sea temperature in September
Belvedere, 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).
Average daylight in September /
Average sunshine in September
Belvedere, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 10h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Belvedere, 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).
Average UV index in September
Belvedere, CA
- Average UV index in September: 5
The months with the highest UV index are April, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Belvedere, 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).
Average visibility in September
Belvedere, 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).
Belvedere, California, USA
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