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
A minor adjustment in Callahan's average high-temperature is noted with the start of September, touching a still hot 86.9°F (30.5°C) from August's 90.9°F (32.7°C). September nights are marked by an average temperature drop to a moderately hot 73.4°F (23°C).Heat index
Throughout September, the heat index is appraised at a fiery hot 100.4°F (38°C). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.
Humidity
In Callahan, Florida, the average relative humidity in September is 76%.Rainfall
In Callahan, during September, the rain falls for 16.8 days and regularly aggregates up to 2.48" (63mm) of precipitation. Throughout the year, in Callahan, there are 165.4 rainfall days, and 28.39" (721mm) of precipitation is accumulated.Snowfall
March through December are months without snowfall.Daylight
The average length of the day in September is 12h and 20min.On the first day of September in Callahan, 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.
Sunshine
In Callahan, Florida, the average sunshine in September is 8.5h.UV index
In September, the average daily maximum UV index in Callahan is 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum high daily UV index of 6 during September translates into the following directions:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Frequently asked questions
How hot is September in Callahan?
What is the average humidity in September in Callahan?
How many days does it rain in September in Callahan?
When it does not snow in Callahan?
What is the average length of the day in September in Callahan?
When is the sunrise / sunset in September in Callahan?
How long on average sun shines in September in Callahan?
What is the UV index intensity in September in Callahan?
Average temperature in September
Callahan, FL
- Average high temperature in September: 86.9°F
The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is January (63°F).
- Average low temperature in September: 73.4°F
The month with the highest average low temperature is August (76.5°F).
The coldest month (with the lowest average low temperature) is January (46.8°F).
Average pressure in September
Callahan, FL
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.98"Hg).
Average wind speed in September
Callahan, FL
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is April (6.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity in September
Callahan, FL
- Average humidity in September: 76%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is March (70%).
Average rainfall in September
Callahan, FL
- Average rainfall in September: 2.48"
The wettest month (with the highest rainfall) is August (4.09").
The driest month (with the least rainfall) is January (1.3").
Average rainfall days in September
Callahan, FL
- Average rainfall days in September: 16.8 days
The month with the highest number of rainy days is August (22.6 days).
The month with the least rainy days is November (8.7 days).
Average snowfall days in September
Callahan, FL
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.1 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Callahan, 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: 8h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Callahan, FL
- Average sunshine days in September: 11.4 days
The month with the most sunshine days is January (19.9 days).
The month with the least sunshine days is August (6.8 days).
Average UV index in September
Callahan, 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
Callahan, FL
- Average cloud cover in September: 33
The month with the most cloud cover is December (Cloud cover 41).
The month with the least cloud cover is May (Cloud cover 28).
Average visibility in September
Callahan, 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).
Callahan, Florida, USA
Weather forecast for your location
2. Allow the app to use your location
