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 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
The high-temperature average in September for Twin Peaks is a moderately hot 85.8°F (29.9°C), staying closely aligned with August's conditions. Twin Peaks undergoes a major shift from daytime highs, averaging a refreshing 62.4°F (16.9°C) during the night in September.Humidity
In September, the average relative humidity is 39%.Rainfall
In Twin Peaks, in September, during 2.6 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. In Twin Peaks, during the entire year, the rain falls for 51.8 days and collects up to 6.69" (170mm) of precipitation.Snowfall
In Twin Peaks, snow does not fall in January, March through December.Daylight
The average length of the day in September in Twin Peaks is 12h and 22min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:14 pm. On the last day of September, sunrise is at 6:43 am and sunset at 6:33 pm PDT.
Sunshine
In Twin Peaks, the average sunshine in September is 10.7h.UV index
The average daily maximum UV index in September in Twin Peaks, California, is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 6 in September interprets into the following recommendations:
Resist overexposure. Safeguarding from solar damage is indispensable. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Frequently asked questions
How hot is September in Twin Peaks?
What is the average humidity in September in Twin Peaks?
How many days does it rain in September in Twin Peaks?
When it does not snow in Twin Peaks?
What is the average length of the day in September in Twin Peaks?
When is the sunrise / sunset in September in Twin Peaks?
How many hours of sunshine does Twin Peaks have in September?
How high is the UV index in September in Twin Peaks?
Average temperature in September
Twin Peaks, CA
- Average high temperature in September: 85.8°F
The warmest month (with the highest average high temperature) is August (90.9°F).
The month with the lowest average high temperature is December (57.7°F).
- Average low temperature in September: 62.4°F
The month with the highest average low temperature is August (66.6°F).
The coldest months (with the lowest average low temperature) are February and December (41.5°F).
Average pressure in September
Twin Peaks, CA
- Average pressure in September: 29.86"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Twin Peaks, CA
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is September (4.8mph).
Average humidity in September
Twin Peaks, CA
- Average humidity in September: 39%
The month with the highest relative humidity is February (52%).
The month with the lowest relative humidity is August (36%).
Average rainfall in September
Twin Peaks, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is December (1.42").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Twin Peaks, CA
- Average rainfall days in September: 2.6 days
The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is June (1.3 days).
Average snowfall days in September
Twin Peaks, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Twin Peaks, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 10h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in September
Twin Peaks, CA
- Average sunshine days in September: 25.7 days
The month with the most sunshine days is June (28.5 days).
The month with the least sunshine days is February (20.9 days).
Average UV index in September
Twin Peaks, CA
- Average UV index in September: 6
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 3).
Average cloud cover in September
Twin Peaks, CA
- Average cloud cover in September: 6
The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in September
Twin Peaks, 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).
Twin Peaks, California, USA
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