September weather forecastBay Harbor Islands, FL
September
Weather in September
The first month of the autumn, September, is still a hot month in Bay Harbor Islands, Florida, with an average temperature ranging between max 86.2°F (30.1°C) and min 81°F (27.2°C).Temperature
At the start of September, Bay Harbor Islands's average high-temperature reaches a still hot 86.2°F (30.1°C), subtly different from the preceding month. Bay Harbor Islands maintains an average of approximately a moderately hot 81°F (27.2°C) during September nights, with only a minimal decrease from the daytime temperature.Heat index
For September, the heat index is appraised at a fiery hot 96.8°F (36°C). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.Factoring in the heat index, values are geared towards shaded areas with light breezes. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Normally, the human body cools itself through perspiration, which removes excessive heat by evaporating sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.
Humidity
In September, the average relative humidity is 73%.Rainfall
In Bay Harbor Islands, during September, the rain falls for 21.7 days and regularly aggregates up to 1.1" (28mm) of precipitation. In Bay Harbor Islands, Florida, during the entire year, the rain falls for 157 days and collects up to 11.34" (288mm) of precipitation.Snowfall
September is the only month when snow falls in Bay Harbor Islands. The month with the most snowfall in Bay Harbor Islands is September, when snow falls for 0.1 days and typically aggregates up to 0.04" (1mm) of snow.Ocean temperature
In Bay Harbor Islands, in September, the average water temperature is 85.5°F (29.7°C).Note: Water surface temperatures from 77°F (25°C) to 84.2°F (29°C) are considered optimal and extremely delightful for long-lasting pleasure in any water activity.
Daylight
In Bay Harbor Islands, the average length of the day in September is 12h and 18min.On the first day of the month, sunrise is at 7:01 am and sunset at 7:39 pm. On the last day of September, in Bay Harbor Islands, sunrise is at 7:12 am and sunset at 7:07 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 in Bay Harbor Islands, Florida. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A typical high UV index of 7 in September suggests the following recommendations:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bay Harbor Islands, FL
- Average high temperature in September: 86.2°F
The warmest month (with the highest average high temperature) is August (87.6°F).
The month with the lowest average high temperature is January (73°F).
- Average low temperature in September: 81°F
The month with the highest average low temperature is August (82°F).
The coldest month (with the lowest average low temperature) is January (64°F).
Average pressure in September
Bay Harbor Islands, FL
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are September and October (29.95"Hg).
Average wind speed in September
Bay Harbor Islands, FL
- Average wind speed in September: 8.1mph
The windiest month (with the highest average wind speed) is March (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).
Average humidity in September
Bay Harbor Islands, FL
- Average humidity in September: 73%
The month with the highest relative humidity is December (75%).
The month with the lowest relative humidity is March (69%).
Average rainfall in September
Bay Harbor Islands, FL
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is August (1.97").
The driest month (with the least rainfall) is January (0.31").
Average rainfall days in September
Bay Harbor Islands, FL
- Average rainfall days in September: 21.7 days
The month with the highest number of rainy days is September (21.7 days).
The month with the least rainy days is February (6.8 days).
Average snowfall in September
Bay Harbor Islands, FL
- Average snowfall in September: 0.04"
The month with the highest snowfall is September (0.04").
The months with the least snowfall are January, February, March, April, May, June, July, August, October, November and December (0").
Average snowfall days in September
Bay Harbor Islands, FL
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is September (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).
Average sea temperature in September
Bay Harbor Islands, FL
- Average sea temperature in September: 85.4°F
The best month for swimming (with the highest average sea temperature) is August (86.5°F).
The coldest month (with the lowest average sea temperature) is February (74°F).
Average daylight in September /
Average sunshine in September
Bay Harbor Islands, FL
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 36min).
- 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 December (Average sunshine: 6h and 18min).
Average sunshine days in September
Bay Harbor Islands, FL
- Average sunshine days in September: 4.4 days
The month with the most sunshine days is March (20.3 days).
The month with the least sunshine days is September (4.4 days).
Average UV index in September
Bay Harbor Islands, 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 5).
Average cloud cover in September
Bay Harbor Islands, FL
- Average cloud cover in September: 30
The month with the most cloud cover is October (Cloud cover 35).
The month with the least cloud cover is April (Cloud cover 27).
Average visibility in September
Bay Harbor Islands, 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).
