September weather forecast
Hollister, FL

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Weather in September

September, the first month of the autumn in Hollister, is still a hot month, with an average temperature fluctuating between 88.5°F (31.4°C) and 73°F (22.8°C).

Temperature

With the start of September, Hollister measures an average high-temperature of a still tropical 88.5°F (31.4°C), not significantly differing from August's 91.9°F (33.3°C). Hollister's nighttime temperature in September falls to an average of 73°F (22.8°C).

Heat index

The heat index for September is calculated to be a blisteringly hot 105.8°F (41°C). Adopt additional preventive measures, heat cramps and heat exhaustion are potential outcomes. Prolonged activity may trigger heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

August, September and December, with an average relative humidity of 77%, are the most humid months.

Rainfall

In September, the rain falls for 15.2 days. Throughout September, 1.18" (30mm) of precipitation is accumulated. In Hollister, during the entire year, the rain falls for 138.3 days and collects up to 12.76" (324mm) of precipitation.

Snowfall

In Hollister, snow does not fall in February through December.

Daylight

The average length of the day in September is 12h and 20min.
On the first day of the month, sunrise is at 7:04 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:20 am and sunset at 7:13 pm EDT.

Sunshine

In September, the average sunshine is 8.5h.

UV index

In Hollister, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 6 suggests these recommendations:
Guard oneself from overexposure. Defence against sun injury is vital. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Updated: Aug 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is September?

The high-temperature, in September, in Hollister, records 88.5°F (31.4°C), while the low-temperature is 73°F (22.8°C). The average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in September is calculated to be 105.8°F (41°C).

What is the most humid month in Hollister?

August, September and December, with an average relative humidity of 77%, are most humid months in Hollister.

What is the average humidity in September?

In September, the average relative humidity in Hollister is 77%.

How many days does it rain in September?

In September, the rain falls for 15.2 days. Throughout September, 1.18" (30mm) of precipitation is accumulated.

When it does not snow in Hollister?

In Hollister, snow does not fall in February through December.

What is the average length of the day in September?

In Hollister, the average day length in September is 12h and 20min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 7:04 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:13 pm EDT.

How many hours of sunshine does Hollister have in September?

In Hollister, the average sunshine duration in September is 8.5h.

How high is the UV index in September?

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Hollister, FL

Average temperature in September - Hollister, FL
  • Average high temperature in September: 88.5°F

The warmest month (with the highest average high temperature) is August (91.9°F).
The month with the lowest average high temperature is January (65.8°F).

  • Average low temperature in September: 73°F

The month with the highest average low temperature is August (75.4°F).
The coldest month (with the lowest average low temperature) is January (48.2°F).

Average pressure in September
Hollister, FL

Average pressure in September - Hollister, FL
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.97"Hg).

Average wind speed in September
Hollister, FL

Average wind speed in September - Hollister, FL
  • Average wind speed in September: 4.6mph

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.2mph).

Average humidity in September
Hollister, FL

Average humidity in September - Hollister, FL
  • Average humidity in September: 77%

The months with the highest relative humidity are August, September and December (77%).
The month with the lowest relative humidity is March (70%).

Average rainfall in September
Hollister, FL

Average rainfall in September - Hollister, FL
  • Average rainfall in September: 1.18"

The wettest month (with the highest rainfall) is July (2.09").
The driest month (with the least rainfall) is March (0.47").

Average rainfall days in September
Hollister, FL

Average rainfall days in September - Hollister, FL
  • Average rainfall days in September: 15.2 days

The month with the highest number of rainy days is August (18.8 days).
The month with the least rainy days is November (6.7 days).

Average snowfall days in September
Hollister, FL

Average snowfall days in September - Hollister, FL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).

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

Average daylight in September / Average sunshine in September - Hollister, FL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

Average sunshine days in September
Hollister, FL

Average sunshine days in September - Hollister, FL
  • Average sunshine days in September: 12.1 days

The month with the most sunshine days is January (21.3 days).
The month with the least sunshine days is June (9.3 days).

Average UV index in September
Hollister, FL

Average UV index in September - Hollister, FL
  • Average UV index in September: 6

The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 4).

Average cloud cover in September
Hollister, FL

Average cloud cover in September - Hollister, FL
  • Average cloud cover in September: 33

The month with the most cloud cover is December (Cloud cover 40).
The months with the least cloud cover are May and July (Cloud cover 30).

Average visibility in September
Hollister, FL

Average visibility in September - Hollister, FL
  • 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).

Hollister, Florida, USA

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