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
As Saint Marks welcomes September, the average high-temperature stabilizes at a warm 84.7°F (29.3°C), showing little deviation from August's 86.5°F (30.3°C). Saint Marks, during September nights, records a temperature marginally cooler than the daytime average, at a still moderately hot 75.9°F (24.4°C).Heat index
The heat index value during September is appraised at a tropical 93.2°F (34°C). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.Research indicates the heat index considers values in shaded locales and with light winds. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
Humidity
In September, the average relative humidity is 75%.Rainfall
In Saint Marks, in September, during 20.3 rainfall days, 5.08" (129mm) of precipitation is typically accumulated. In Saint Marks, during the entire year, the rain falls for 173 days and collects up to 43.74" (1111mm) of precipitation.Daylight
The average length of the day in September in Saint Marks is 12h and 20min.On the first day of September, 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 is 9.1h.UV index
In Saint Marks, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: An average UV index of 6 in September transforms into this advice:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What is the average humidity in September in Saint Marks?
How much does it rain in September?
How many hours of daylight does Saint Marks have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
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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