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 snowfall 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
As August transitions into September, O'Brien records an average high-temperature of a still tropical 87.8°F (31°C), showing a gentle shift from the preceding month. O'Brien witnesses an average low-temperature of 70.9°F (21.6°C) throughout the month of September.Heat index
The heat index in September is estimated at a blisteringly hot 104°F (40°C). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.Understanding the heat index involves considering values for shaded locales with light wind. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.
Humidity
The months with the highest humidity in O'Brien, Florida, are August and September, with an average relative humidity of 77%.Rainfall
In September, in O'Brien, the rain falls for 19.6 days. Throughout September, 3.7" (94mm) of precipitation is accumulated. Throughout the year, there are 173.7 rainfall days, and 30.83" (783mm) of precipitation is accumulated.Snowfall
January, March through December are months without snowfall in O'Brien.Daylight
The average length of the day in September is 12h and 20min.On the first day of the month, sunrise is at 7:09 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:24 am and sunset at 7:18 pm EDT.
Sunshine
In September, the average sunshine is 8.3h.UV index
In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: An average UV index of 6 in September transforms into this advice:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Frequently asked questions
How hot is it in O'Brien in September?
What are the most humid months in O'Brien?
What is the average humidity in September in O'Brien?
How many days does it rain in September in O'Brien?
When it does not snow in O'Brien?
What is the average length of the day in September in O'Brien?
What time are sunrise and sunset in September in O'Brien?
How long on average sun shines in September in O'Brien?
What is the UV index intensity in September in O'Brien?
Average temperature in September
O'Brien, FL
- Average high temperature in September: 87.8°F
The warmest months (with the highest average high temperature) are July and August (91.2°F).
The month with the lowest average high temperature is January (62.2°F).
- Average low temperature in September: 70.9°F
The month with the highest average low temperature is August (74.8°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).
Average pressure in September
O'Brien, FL
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.98"Hg).
Average wind speed in September
O'Brien, FL
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in September
O'Brien, FL
- Average humidity in September: 77%
The months with the highest relative humidity are August and September (77%).
The month with the lowest relative humidity is May (70%).
Average rainfall in September
O'Brien, FL
- Average rainfall in September: 3.7"
The wettest month (with the highest rainfall) is August (4.53").
The driest month (with the least rainfall) is November (0.98").
Average rainfall days in September
O'Brien, FL
- Average rainfall days in September: 19.6 days
The month with the highest number of rainy days is August (25.4 days).
The month with the least rainy days is November (7.1 days).
Average snowfall days in September
O'Brien, FL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
O'Brien, 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 2min
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
O'Brien, FL
- Average sunshine days in September: 8.8 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is August (4.2 days).
Average UV index in September
O'Brien, FL
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).
Average cloud cover in September
O'Brien, FL
- Average cloud cover in September: 36
The month with the most cloud cover is December (Cloud cover 40).
The months with the least cloud cover are May and October (Cloud cover 30).
Average visibility in September
O'Brien, FL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is December (5mi).
O'Brien, Florida, USA
Weather forecast for your location
2. Allow the app to use your location
