September weather forecastHollister, FL
September
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 12h and 18min
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 30min
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: 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: 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: 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: 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).
