September weather forecastMerritt Island, FL
September
Weather in September
September, the first month of the autumn in Merritt Island, is still a warm month, with an average temperature fluctuating between 85.1°F (29.5°C) and 77.7°F (25.4°C).Temperature
Transitioning into September, Merritt Island records an average high-temperature of a moderately hot 85.1°F (29.5°C), almost identical to August's 87.3°F (30.7°C). September nighttime temperatures hover close to the daytime peak with an average of 77.7°F (25.4°C).Heat index
September's average heat index is calculated to be a torrid 95°F (35°C). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', integrates the air's temperature and its humidity to showcase the felt temperature by people. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. When body heat isn't effectively managed, risks of dehydration and overheating amplify.
Humidity
The average relative humidity in September is 77%.Rainfall
In Merritt Island, during September, the rain falls for 22.5 days and regularly aggregates up to 3.58" (91mm) of precipitation. Throughout the year, there are 190.9 rainfall days, and 29.37" (746mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 19min.On the first day of the month, sunrise is at 7:01 am and sunset at 7:43 pm. On the last day of September, sunrise is at 7:15 am and sunset at 7:09 pm EDT.
Sunshine
The average sunshine in September is 9h.UV index
May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 7 in September interprets into the following recommendations:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Merritt Island, FL
- Average high temperature in September: 85.1°F
The warmest month (with the highest average high temperature) is August (87.3°F).
The month with the lowest average high temperature is January (68.4°F).
- Average low temperature in September: 77.7°F
The month with the highest average low temperature is August (78.6°F).
The coldest month (with the lowest average low temperature) is January (57.7°F).
Average pressure in September
Merritt Island, FL
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.97"Hg).
Average wind speed in September
Merritt Island, FL
- Average wind speed in September: 7.9mph
The windiest months (with the highest average wind speed) are January and November (10mph).
The calmest month (with the lowest average wind speed) is July (6.9mph).
Average humidity in September
Merritt Island, FL
- Average humidity in September: 77%
The month with the highest relative humidity is August (79%).
The month with the lowest relative humidity is March (72%).
Average rainfall in September
Merritt Island, FL
- Average rainfall in September: 3.58"
The wettest month (with the highest rainfall) is August (5.12").
The driest month (with the least rainfall) is March (1.14").
Average rainfall days in September
Merritt Island, FL
- Average rainfall days in September: 22.5 days
The month with the highest number of rainy days is August (24.7 days).
The month with the least rainy days is February (9.6 days).
Average daylight in September /
Average sunshine in September
Merritt Island, FL
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 6min).
Average sunshine days in September
Merritt Island, FL
- Average sunshine days in September: 5.3 days
The month with the most sunshine days is January (17.2 days).
The month with the least sunshine days is August (3.1 days).
Average UV index in September
Merritt Island, FL
- Average UV index in September: 7
The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 4).
Average cloud cover in September
Merritt Island, FL
- Average cloud cover in September: 28
The months with the most cloud cover are January, November and December (Cloud cover 34).
The months with the least cloud cover are April, May and July (Cloud cover 26).
Average visibility in September
Merritt Island, 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).
