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
Westley marks the start of September with an average high-temperature of a hot 89.8°F (32.1°C), hinting at a slight fluctuation from August's 95°F (35°C). The nighttime temperature during September displays a significant divergence from daily peaks, averaging at a refreshing 59.2°F (15.1°C).Heat index
Throughout September, the heat index is calculated to be a hot 91.4°F (33°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.In terms of the heat index, values are set with light wind and shade conditions in mind. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', binds temperature metrics with humidity values to give a sense of the actual warmth. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
Humidity
In September, the average relative humidity in Westley 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, in Westley, there are 49.1 rainfall days, and 2.8" (71mm) of precipitation is accumulated.Daylight
The average length of the day in September 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 value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 5 during September translates into the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Frequently asked questions
How hot does it get in Westley in September?
What is the average humidity in September in Westley?
How many days does it rain in September in Westley?
How many hours of daylight does Westley have in September?
When is the sunrise / sunset in September in Westley?
How long on average sun shines in September in Westley?
What is the UV index reading in September in Westley?
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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