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 in September
- Average snowfall days 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
In September, the average high-temperature marginally drops from 85.5°F (29.7°C) in August to a still moderately hot 78.1°F (25.6°C). An average temperature of 60.3°F (15.7°C) is recorded in Swansea during the nights in September.Humidity
The average relative humidity in September in Swansea is 22%.Rainfall
June and September are months with the least rain in Swansea when the rain falls for 2.3 days and typically aggregates up to 0.16" (4mm) of rain.Snowfall
May through October are months without snowfall in Swansea.Daylight
In Swansea, the average length of the day in September is 12h and 24min.On the first day of September in Swansea, sunrise is at 6:23 am and sunset at 7:19 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:35 pm PDT.
Sunshine
The average sunshine in September in Swansea is 10.9h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 5 in September translates into this advice:
Act with care - The need to guard against sun damage is communicated. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Frequently asked questions
What are the temperatures in Swansea in September?
What is the average humidity in September in Swansea?
What is the driest month in Swansea?
How many days does it rain in September in Swansea?
When it does not snow in Swansea?
What is the average length of the day in September in Swansea?
What time are sunrise and sunset in September in Swansea?
How long on average sun shines in September in Swansea?
What is the UV index intensity in September in Swansea?
Average temperature in September
Swansea, CA
- Average high temperature in September: 78.1°F
The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is December (46.9°F).
- Average low temperature in September: 60.3°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is December (31.5°F).
Average pressure in September
Swansea, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in September
Swansea, CA
- Average wind speed in September: 6.2mph
The windiest months (with the highest average wind speed) are April, May and June (7.6mph).
The calmest month (with the lowest average wind speed) is November (5.8mph).
Average humidity in September
Swansea, CA
- Average humidity in September: 22%
The month with the highest relative humidity is December (47%).
The month with the lowest relative humidity is August (19%).
Average rainfall in September
Swansea, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is December (0.67").
The driest months (with the least rainfall) are June and September (0.16").
Average rainfall days in September
Swansea, CA
- Average rainfall days in September: 2.3 days
The month with the highest number of rainy days is March (5.7 days).
The month with the least rainy days is September (2.3 days).
Average snowfall in September
Swansea, CA
- Average snowfall in September: 0"
The month with the highest snowfall is December (1.18").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Swansea, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (1.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Swansea, CA
- Average daylight in September: 12h and 2min
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: 10h and 5min
The month with the most sunshine is June (Average sunshine: 12h and 12min).
The months with the least sunshine are January, February and December (Average sunshine: 7h and 18min).
Average sunshine days in September
Swansea, CA
- Average sunshine days in September: 25 days
The month with the most sunshine days is October (27.7 days).
The month with the least sunshine days is July (20 days).
Average UV index in September
Swansea, CA
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are November and December (UV index 2).
Average cloud cover in September
Swansea, CA
- Average cloud cover in September: 5
The month with the most cloud cover is January (Cloud cover 16).
The months with the least cloud cover are August and September (Cloud cover 5).
Average visibility in September
Swansea, 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).
Swansea, California, USA
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