September weather forecast
Hollister, CA

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Weather in September

The first month of the autumn, September, is still a warm month in Hollister, California, with temperature in the range of an average high of 85.1°F (29.5°C) and an average low of 54.9°F (12.7°C).

Temperature

September's onset records a minor alteration in the average high-temperature to a warm 85.1°F (29.5°C) from August's 87.4°F (30.8°C). Hollister sees a consistent average low-temperature of 54.9°F (12.7°C) in September, indicating a substantial decrease from the day's temperature.

Heat index

September's average heat index is evaluated at a hot 87.8°F (31°C). Prolonged activity during exposure might result in a state of fatigue and cause heat cramps.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', offers an insight into how hot it feels when we factor in moisture content. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. 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 September, the average relative humidity in Hollister is 54%.

Rainfall

In September, the rain falls for 1.5 days. Throughout September, 0.08" (2mm) of precipitation is accumulated. Throughout the year, there are 59.2 rainfall days, and 8.66" (220mm) of precipitation is accumulated.

Daylight

In September, the average length of the day in Hollister is 12h and 24min.
On the first day of the month, sunrise is at 6:37 am and sunset at 7:33 pm. On the last day of September, sunrise is at 7:00 am and sunset at 6:49 pm PDT.

Sunshine

In Hollister, California, the average sunshine in September is 11.4h.

UV index

In Hollister, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.
Note: An average UV index of 5 in September transforms into this advice:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
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Frequently asked questions

How hot is it in Hollister in September?

In Hollister, in September, the average high-temperature is 85.1°F (29.5°C), and the average low-temperature is 54.9°F (12.7°C). In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is evaluated at 87.8°F (31°C).

What is the average humidity in September in Hollister?

In Hollister, the average relative humidity in September is 54%.

How many days does it rain in September in Hollister?

In Hollister, in September, it is raining for 1.5 days, with typically 0.08" (2mm) of accumulated precipitation.

What is the average length of the day in September in Hollister?

In Hollister, California, the average day length in September is 12h and 24min.

When is the sunrise / sunset in September in Hollister?

On the first day of September, sunrise is at 6:37 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:49 pm PDT.

How long on average sun shines in September in Hollister?

In September, the average sunshine duration in Hollister is 11.4h.

What is the UV index intensity in September in Hollister?

The average daily maximum UV index in September in Hollister is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Hollister, CA

Average temperature in September - Hollister, CA
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is December (57.4°F).

  • Average low temperature in September: 54.9°F

The month with the highest average low temperature is August (55.4°F).
The coldest months (with the lowest average low temperature) are March and December (40.3°F).

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Average pressure in September
Hollister, CA

Average pressure in September - Hollister, CA
  • Average pressure in September: 29.92"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).

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Average wind speed in September
Hollister, CA

Average wind speed in September - Hollister, CA
  • Average wind speed in September: 4.2mph

The windiest month (with the highest average wind speed) is May (5.5mph).
The calmest month (with the lowest average wind speed) is November (3.7mph).

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Average humidity in September
Hollister, CA

Average humidity in September - Hollister, CA
  • Average humidity in September: 54%

The month with the highest relative humidity is March (73%).
The month with the lowest relative humidity is July (53%).

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Average rainfall in September
Hollister, CA

Average rainfall in September - Hollister, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is December (1.57").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Hollister, CA

Average rainfall days in September - Hollister, CA
  • Average rainfall days in September: 1.5 days

The month with the highest number of rainy days is March (11.6 days).
The month with the least rainy days is August (0.3 days).

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

Average daylight in September / Average sunshine in September - Hollister, 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 42min).

  • Average sunshine in September: 11h and 2min

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 6min).

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Average sunshine days in September
Hollister, CA

Average sunshine days in September - Hollister, CA
  • Average sunshine days in September: 27.8 days

The month with the most sunshine days is August (30.3 days).
The month with the least sunshine days is March (18.6 days).

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Average UV index in September
Hollister, CA

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

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Hollister, CA

Average cloud cover in September - Hollister, CA
  • Average cloud cover in September: 7

The month with the most cloud cover is March (Cloud cover 34).
The months with the least cloud cover are July and August (Cloud cover 5).

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Average visibility in September
Hollister, CA

Average visibility in September - Hollister, 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).

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Hollister, California, USA

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