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 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
September's arrival brings an average high-temperature of a hot 89.8°F (32.1°C), demonstrating subtle variation from the preceding month. Westley, during the nights of September, registers a substantial plunge from the daytime high, averaging at a refreshing 59.2°F (15.1°C).Heat index
September's mean heat index is appraised at a tropical 91.4°F (33°C). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.In reference to the heat index, it's for places in shade and with a slight wind. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
Humidity
In Westley, the average relative humidity in September is 43%.Rainfall
In Westley, during September, the rain falls for 1.8 days and regularly aggregates up to 0.08" (2mm) of precipitation. Throughout the year, there are 49.1 rainfall days, and 2.8" (71mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 25min.On the first day of September, sunrise is at 6:35 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:48 pm PDT.
Sunshine
The average sunshine in September is 11.5h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. Around midday, solar radiation is most harmful; hence, exposure should be limited. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
How many days does it rain in September?
How many hours of daylight does Westley have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Westley have in September?
What is the UV index intensity in September?
Average temperature in September
Westley, CA
- Average high temperature in September: 89.8°F
The warmest month (with the highest average high temperature) is July (96.4°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in September: 59.2°F
The months with the highest average low temperature are July and August (60.8°F).
The coldest months (with the lowest average low temperature) are January and December (41°F).
Average pressure in September
Westley, 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
Westley, CA
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is June (6.7mph).
The calmest months (with the lowest average wind speed) are January and November (5.1mph).
Average humidity in September
Westley, CA
- Average humidity in September: 43%
The month with the highest relative humidity is January (72%).
The month with the lowest relative humidity is July (39%).
Average rainfall in September
Westley, CA
- Average rainfall in September: 0.08"
The wettest months (with the highest rainfall) are March and December (0.47").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in September
Westley, CA
- Average rainfall days in September: 1.8 days
The month with the highest number of rainy days is March (8.5 days).
The month with the least rainy days is June (1 days).
Average daylight in September /
Average sunshine in September
Westley, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 11h and 3min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in September
Westley, CA
- Average sunshine days in September: 27.2 days
The month with the most sunshine days is August (28.9 days).
The month with the least sunshine days is March (20.9 days).
Average UV index in September
Westley, CA
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Westley, CA
- Average cloud cover in September: 6
The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Westley, 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).
Westley, California, USA
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