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 arrival of September corresponds with a light shift in temperature, down from a sweltering 96.8°F (36°C) in August to a tropical 90.7°F (32.6°C). Porterville encounters a significant temperature differential, with an average low-temperature of 61.9°F (16.6°C) during September nights.Humidity
The average relative humidity in September is 32%.Rainfall
In September, the rain falls for 1.5 days. Throughout September, 0.12" (3mm) of precipitation is accumulated. In Porterville, during the entire year, the rain falls for 52.3 days and collects up to 9.37" (238mm) of precipitation.Snowfall
January, March through December are months without snowfall.Daylight
The average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:28 am and sunset at 7:23 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:40 pm PDT.
Sunshine
The average sunshine in September is 11h.UV index
In September, the average daily maximum UV index in Porterville is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 6 during September leads to these advisories:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Frequently asked questions
How hot does it get in Porterville in September?
What is the average humidity in September in Porterville?
How much does it rain in Porterville in September?
When it does not snow in Porterville?
What is the average length of the day in September in Porterville?
When is the sunrise / sunset in September in Porterville?
How many hours of sunshine does Porterville have in September?
What is the UV index reading in September in Porterville?
Average temperature in September
Porterville, CA
- Average high temperature in September: 90.7°F
The warmest month (with the highest average high temperature) is July (97.7°F).
The month with the lowest average high temperature is December (57.6°F).
- Average low temperature in September: 61.9°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is December (40.3°F).
Average pressure in September
Porterville, CA
- Average pressure in September: 29.91"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Porterville, CA
- Average wind speed in September: 4.5mph
The windiest month (with the highest average wind speed) is June (5.2mph).
The calmest month (with the lowest average wind speed) is December (3.6mph).
Average humidity in September
Porterville, CA
- Average humidity in September: 32%
The month with the highest relative humidity is January (64%).
The month with the lowest relative humidity is August (30%).
Average rainfall in September
Porterville, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is March (1.93").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in September
Porterville, CA
- Average rainfall days in September: 1.5 days
The month with the highest number of rainy days is March (9.3 days).
The month with the least rainy days is August (0.5 days).
Average snowfall days in September
Porterville, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.2 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
Porterville, 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 48min).
- Average sunshine in September: 11h and 0min
The months with the most sunshine are June and July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in September
Porterville, CA
- Average sunshine days in September: 27.7 days
The month with the most sunshine days is August (28.8 days).
The month with the least sunshine days is February (20.3 days).
Average UV index in September
Porterville, 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, November and December (UV index 3).
Average cloud cover in September
Porterville, CA
- Average cloud cover in September: 5
The month with the most cloud cover is March (Cloud cover 24).
The months with the least cloud cover are July and August (Cloud cover 4).
Average visibility in September
Porterville, 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).
Porterville, California, USA
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