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Best
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Best
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Best
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Best
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Tan
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Sea
13°
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13°
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14°
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14°
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15°
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17°
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18°
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19°
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19°
Swim
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17°
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16°
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15°
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September is one of the best months to visit Marin County for the best beach weather. It has the most sunshine and best sunbathing and swimming conditions of the year.
The weather in September is slightly warmer than the previous month. September has average maximum temperatures of 25°C (76°F) which is nice and warm and makes sunbathing pleasant on clear days. The sunshine percentage is 73.2% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.1hrs making the days long and bright.
September has total rainfall of 0.5cm (0.2inches) making it extremely dry with only very rare light showers. There are just 1.4 days with some rainfall so you can still enjoy the beach on the majority of rain free clear days and rainy days are few and far between.
Sea temperatures are a cool 19°C (66°F). September is a slightly chilly month for swimming in Marin County. The sea temperature in September is slightly warmer than the previous month.
Also consider visiting Marin County in one of the other best months of June, July, August, for the best beach weather. Also consider one of our other suggestions for September.
Yes, September is a great time for sunbathing in Marin County.
September has average maximum temperatures of 25°C (76°F) which is nice and warm and makes sunbathing pleasant on clear days. The sunshine percentage is 73.2% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.1hrs making the days long and bright. September has total rainfall of 0.5cm (0.2inches) making it extremely dry with only very rare light showers. There are just 1.4 days with some rainfall so you can still enjoy the beach on the majority of rain free clear days and rainy days are few and far between.
More about September temperature and sunshine.
Yes, September is a a slightly chilly month for swimming in Marin County with cool sea temperatures 19°C (66°F).
More about September sea temperatures.
Yes, September is a good time for a holiday in Marin County.
September has average maximum temperatures of 25°C (76°F) which is nice and warm and makes sunbathing pleasant on clear days. The sunshine percentage is 73.2% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.1hrs making the days long and bright. September has total rainfall of 0.5cm (0.2inches) making it extremely dry with only very rare light showers. There are just 1.4 days with some rainfall so you can still enjoy the beach on the majority of rain free clear days and rainy days are few and far between. Sea temperatures are a cool 19°C (66°F). September is a slightly chilly month for swimming in Marin County.
More about the September temperatures and sunshine.
Yes, Marin County is nice and warm and makes sunbathing pleasant on clear days in September.
The average maximum temperature in Marin County in September is 25°C (76°F). The average maximum temperature is 24°C (75°) in the previous month and 23°C (73°F) in the next month.
The average temperature in Marin County in September is 18°C (65°F). The average temperature is 18°C (65°F) in the previous month and 17°C (62°F) in the next month.
More info about the September temperatures and sunshine.
The average day light hours per day in Marin County in September are 12.4. The sunshine percentage is 73.2% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.1hrs making the days long and bright.
More about September sunshine.
The weather in September is slightly warmer than the previous month. The average maximum temperature in Marin County in September is 25°C (76°F). The average maximum temperature is 24°C (75°F) in the previous month and 23°C (73°F) in the next month.
The average temperature in Marin County in September is 18°C (65°F). The average temperature is 18°C (65°F) in the previous month and 17°C (62°F) in the next month.
The average minimum temperature in Marin County in September is 12°C (54°F). The minimum temperature is 12°C (54°F) in the previous month and 10°C (51°F) in the next month.
The days in September are shorter than the previous month and days continue to get shorter into October. September has less hours of sunshine than the previous month and hours of sunshine continue to drop quickly into October. During September the average day light hours are 12.4 per day in Marin County. The sunshine percentage is 73.2% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.1hrs making the days long and bright.
The ultraviolet index in Marin County in September is typically 7.6 during September. An ultraviolet index reading of 8 to 10 indicates a very high risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 15 minutes. Take extra precautions because unprotected skin and eyes will be damaged and can burn quickly. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.
The average sea water temperature in Marin County in September is 19.1°C (66.4°F) which is comfortable for swimming though some may prefer warmer water. The sea temperature in September is slightly warmer than the previous month.
September weather is marginally wetter than the previous month and rainfall continues to rise slightly into October. September has a couple of more days of rain than the previous month and rainy days continue to rise into October. The average total rainfall in Marin County in September is 0.5cm (0.2inches) and on average there are 1.4 rainy days in September making it an extremely dry time to visit the beach.
The maximum dew point (an indicator of humidity) in Marin County in September is 14°C (56°F) which is comfortable for everyone. The dew point is 14°C (58°F) in the previous month and 12°C (12°F) in the next month.
The average maximum relative humidity in Marin County in September is typically 92.3%. The maximum relative humidity is 93.5% in the previous month and 91.5% in the next month.
The average relative humidity in Marin County in September is typically 73%. The average relative humidity is 76.5% in the previous month and 71.6% in the next month.
The average maximum wind speed in Marin County in September is typically 31KM/H (19MPH). The average maximum wind speed is 30KM/H (19MPH) in the previous month and 27KM/H (17MPH) in the next month.
The average wind speed in Marin County in September is typically 12KM/H (8MPH). The average wind speed is 13KM/H (8MPH) in the previous month and 10KM/H (6MPH) in the next month.
The average wind direction in Marin County in September is from the West-Northwest.
Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.
Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.
