September weather forecast and climate
Westley, CA

Weather in September

The first month of the autumn, September, is still a tropical month in Westley, California, with average temperature varying between 89.8°F (32.1°C) and 59.2°F (15.1°C).

Temperature

In Westley, the average high-temperature is relatively the same as in August - a tropical 89.8°F (32.1°C). In Westley, in September, the average low-temperature is 59.2°F (15.1°C).

Heat index

The average heat index in September is evaluated at a hot 91.4°F (33°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, metabolic differences, clothing), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In September, the average relative humidity in Westley is 43%.

Rainfall

In Westley, California, during September, the rain falls for 1.8 days and regularly aggregates up to 0.08" (2mm) of precipitation. In Westley, during the entire year, the rain falls for 49.1 days and collects up to 2.8" (71mm) of precipitation.

Daylight

The average length of the day in Westley is 12.4h.

Sunshine

The average sunshine in Westley is 11.5h.

UV index

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to the UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What is the temperature in September in Westley?

The average high-temperature, in September, in Westley, is 89.8°F (32.1°C), while the average low-temperature is 59.2°F (15.1°C). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that combines relative humidity and air temperature, is estimated at 91.4°F (33°C).

What is the average humidity in September in Westley?

In Westley, the average relative humidity in September is 43%.

How much does it rain in Westley in September?

In Westley, during September, the rain falls for 1.8 days and regularly aggregates up to 0.08" (2mm) of precipitation.

How many hours of daylight does Westley have in September?

The average length of the day in September is 12.4h.

How many hours of sunshine does Westley have in September?

In September, the average sunshine in Westley is 11.5h.

What is the UV index intensity in September in Westley?

In September, the average daily maximum UV index in Westley, California, is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Westley, CA

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

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).

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Average pressure in September
Westley, CA

Average pressure in September - Westley, CA
  • Average pressure in September: 29.92"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Westley, CA

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).

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Average humidity in September
Westley, CA

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%).

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Average rainfall in September
Westley, CA

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").

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Average rainfall days in September
Westley, CA

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).

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Average daylight in September /
Average sunshine in September
Westley, CA

Average daylight in September / Average sunshine in September - Westley, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 11.5h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average sunshine days in September
Westley, CA

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).

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Average UV index in September
Westley, CA

Average UV index in September - Westley, CA
  • Average UV index in September: 5

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Westley, CA

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).

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Average visibility in September
Westley, CA

Average visibility in September - Westley, CA
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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