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
Welcoming September, Jupiter Island notes an average high-temperature of a warm 84.7°F (29.3°C), nearly consistent with August's 86.5°F (30.3°C). Jupiter Island, during September nights, witnesses an average temperature marginally cooler than its daytime highs, at a still moderately hot 79.2°F (26.2°C).Heat index
For most parts of September, the heat index is calculated to be a very hot 95°F (35°C). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.Note that heat index values are valued for light wind and location in the shade. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is the outcome of merging air's temperature and its humidity metrics. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.
Humidity
The average relative humidity in September in Jupiter Island, Florida, is 76%.Rainfall
In Jupiter Island, during September, the rain falls for 24.7 days and regularly aggregates up to 5.35" (136mm) of precipitation. Throughout the year, there are 227.4 rainfall days, and 44.72" (1136mm) of precipitation is accumulated.Daylight
In Jupiter Island, Florida, the average length of the day in September is 12h and 19min.On the first day of the month, sunrise is at 7:00 am and sunset at 7:40 pm. On the last day of September, in Jupiter Island, sunrise is at 7:12 am and sunset at 7:07 pm EDT.
Sunshine
The average sunshine in September in Jupiter Island, Florida, is 8.9h.UV index
May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: An average maximum UV index of 7 in September leads to these recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot in Jupiter Island during September?
What is the average humidity in September in Jupiter Island?
How many days does it rain in September in Jupiter Island?
How many hours of daylight does Jupiter Island have in September?
When is the sunrise / sunset in September in Jupiter Island?
How long on average sun shines in September in Jupiter Island?
What are the months with the highest UV index in Jupiter Island?
What is the UV index reading in September in Jupiter Island?
Average temperature in September
Jupiter Island, FL
- Average high temperature in September: 84.7°F
The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is January (71.2°F).
- Average low temperature in September: 79.2°F
The month with the highest average low temperature is August (81°F).
The coldest month (with the lowest average low temperature) is January (63.1°F).
Average pressure in September
Jupiter Island, FL
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are September and October (29.96"Hg).
Average wind speed in September
Jupiter Island, FL
- Average wind speed in September: 8.6mph
The windiest month (with the highest average wind speed) is January (11.4mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in September
Jupiter Island, FL
- Average humidity in September: 76%
The month with the highest relative humidity is June (78%).
The month with the lowest relative humidity is March (71%).
Average rainfall in September
Jupiter Island, FL
- Average rainfall in September: 5.35"
The wettest month (with the highest rainfall) is August (7.64").
The driest month (with the least rainfall) is January (1.34").
Average rainfall days in September
Jupiter Island, FL
- Average rainfall days in September: 24.7 days
The month with the highest number of rainy days is August (26.7 days).
The month with the least rainy days is January (13 days).
Average daylight in September /
Average sunshine in September
Jupiter Island, FL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in September: 8h and 5min
The months with the most sunshine are July and August (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 54min).
Average sunshine days in September
Jupiter Island, FL
- Average sunshine days in September: 3.8 days
The month with the most sunshine days is January (14.3 days).
The month with the least sunshine days is August (2.4 days).
Average UV index in September
Jupiter 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 months with the lowest UV index are January and February (UV index 5).
Average cloud cover in September
Jupiter Island, FL
- Average cloud cover in September: 31
The months with the most cloud cover are November and December (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Jupiter 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).
Jupiter Island, Florida, USA
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