September weather forecastTranquillity, CA
September
Weather in September
September, the first month of the autumn in Tranquillity, is also a hot month, with an average temperature fluctuating between 91.6°F (33.1°C) and 63°F (17.2°C).Temperature
A moderate decline in average high-temperatures is noted in September, moving from a fiery hot 98.2°F (36.8°C) in August to a tropical 91.6°F (33.1°C). Throughout September, Tranquillity notes a dramatic plunge from the daily high to an average low-temperature of 63°F (17.2°C).Humidity
The average relative humidity in September is 35%.Rainfall
January through July, September through December are months with rainfall in Tranquillity. September is the first month it rains. Throughout September, in the average 1.5 rainfall days, it receives 0.08" (2mm) of precipitation. Throughout the year, in Tranquillity, there are 59.3 rainfall days, and 8.86" (225mm) of precipitation is accumulated.Daylight
In September, the average length of the day in Tranquillity is 12h and 24min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:28 pm. On the last day of September, in Tranquillity, California, sunrise is at 6:56 am and sunset at 6:45 pm PDT.
Sunshine
In Tranquillity, California, the average sunshine in September is 11.4h.UV index
In Tranquillity, California, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 6 during September, leads to the following recommendations:
Guard against overexposure. Protection from sun-induced harm is essential. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Tranquillity, CA
- Average high temperature in September: 91.6°F
The warmest month (with the highest average high temperature) is July (99.9°F).
The month with the lowest average high temperature is December (55.9°F).
- Average low temperature in September: 63°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is December (42.3°F).
Average pressure in September
Tranquillity, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Tranquillity, CA
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is June (7.6mph).
The calmest month (with the lowest average wind speed) is January (4.8mph).
Average humidity in September
Tranquillity, CA
- Average humidity in September: 35%
The month with the highest relative humidity is January (67%).
The month with the lowest relative humidity is July (31%).
Average rainfall in September
Tranquillity, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is March (1.69").
The driest month (with the least rainfall) is August (0").
Average rainfall days in September
Tranquillity, CA
- Average rainfall days in September: 1.5 days
The month with the highest number of rainy days is March (11.4 days).
The month with the least rainy days is August (0.6 days).
Average daylight in September /
Average sunshine in September
Tranquillity, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 11h and 24min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The months with the least sunshine are February and December (Average sunshine: 6h and 24min).
Average sunshine days in September
Tranquillity, CA
- Average sunshine days in September: 27.4 days
The month with the most sunshine days is August (29.8 days).
The month with the least sunshine days is March (18.7 days).
Average UV index in September
Tranquillity, CA
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Tranquillity, CA
- Average cloud cover in September: 5
The months with the most cloud cover are March and December (Cloud cover 29).
The months with the least cloud cover are July and August (Cloud cover 4).
Average visibility in September
Tranquillity, 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).
