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 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
The high-temperature average in September for Saint Marks, Florida, is a moderately hot 84.7°F (29.3°C), staying closely aligned with August's conditions. Saint Marks indicates a consistently low-temperature of 75.9°F (24.4°C) during the nights of September.Heat index
September's heat index is calculated to be a tropical 93.2°F (34°C). Exercise special caution, heat exhaustion and heat cramps are probable. Prolonged activity may induce heatstroke.Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', binds temperature metrics with humidity values to give a sense of the actual warmth. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
Humidity
In September, the average relative humidity is 75%.Rainfall
In September, in Saint Marks, the rain falls for 20.3 days. Throughout September, 5.08" (129mm) of precipitation is accumulated. In Saint Marks, during the entire year, the rain falls for 173 days and collects up to 43.74" (1111mm) of precipitation.Daylight
In Saint Marks, the average length of the day in September is 12h and 20min.On the first day of September in Saint Marks, sunrise is at 7:14 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 7:23 pm EDT.
Sunshine
In September, the average sunshine in Saint Marks is 9.1h.UV index
In September, the average daily maximum UV index in Saint Marks is 6. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 6 during September translates into the following recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Frequently asked questions
How hot is September in Saint Marks?
What is the average humidity in September in Saint Marks?
How much does it rain in Saint Marks in September?
What is the average length of the day in September in Saint Marks?
When are sunrise and sunset in September in Saint Marks?
How long on average sun shines in September in Saint Marks?
What is the UV index reading in September in Saint Marks?
Average temperature in September
Saint Marks, FL
- Average high temperature in September: 84.7°F
The warmest months (with the highest average high temperature) are July and August (86.5°F).
The month with the lowest average high temperature is January (60.1°F).
- Average low temperature in September: 75.9°F
The month with the highest average low temperature is August (79.7°F).
The coldest month (with the lowest average low temperature) is January (49.6°F).
Average pressure in September
Saint Marks, 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
Saint Marks, FL
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is July (8mph).
Average humidity in September
Saint Marks, FL
- Average humidity in September: 75%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Saint Marks, FL
- Average rainfall in September: 5.08"
The wettest month (with the highest rainfall) is August (8.35").
The driest month (with the least rainfall) is November (1.46").
Average rainfall days in September
Saint Marks, FL
- Average rainfall days in September: 20.3 days
The month with the highest number of rainy days is August (26.1 days).
The month with the least rainy days is November (7.4 days).
Average daylight in September /
Average sunshine in September
Saint Marks, FL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is May (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in September
Saint Marks, FL
- Average sunshine days in September: 7 days
The month with the most sunshine days is November (21.2 days).
The month with the least sunshine days is August (2.7 days).
Average UV index in September
Saint Marks, 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
Saint Marks, FL
- Average cloud cover in September: 25
The month with the most cloud cover is December (Cloud cover 35).
The month with the least cloud cover is May (Cloud cover 21).
Average visibility in September
Saint Marks, 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).
Saint Marks, Florida, USA
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