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
Sun Valley's weather in September, with an average high-temperature of a moderately hot 85.1°F (29.5°C), subtly shifts from August's 86.7°F (30.4°C). Sun Valley experiences a steady nighttime temperature of 80.1°F (26.7°C) throughout the month of September.Heat index
Throughout September, the heat index is appraised at a fiery hot 95°F (35°C). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.Heat index details are generally centered around shaded locations and a mild breeze. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', takes into account both air temperature and humidity to illustrate what people actually feel. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. When relative humidity is at high levels, the evaporation rate lessens, causing the body to keep more heat than it would in less humid conditions. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.
Humidity
In September, the average relative humidity is 75%.Rainfall
In Sun Valley, during September, the rain falls for 26.8 days and regularly aggregates up to 7.48" (190mm) of precipitation. Throughout the year, there are 238.3 rainfall days, and 54.53" (1385mm) of precipitation is accumulated.Daylight
The average length of the day in September is 12h and 18min.On the first day of September, sunrise is at 7:00 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:07 pm EDT.
Sunshine
In Sun Valley, the average sunshine in September is 8.9h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 7 during September leads to these instructions:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the average humidity in September?
How many days does it rain in September?
How many hours of daylight does Sun Valley have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
When is the highest UV index?
What is the UV index intensity in September?
Average temperature in September
Sun Valley, FL
- Average high temperature in September: 85.1°F
The warmest month (with the highest average high temperature) is August (86.7°F).
The month with the lowest average high temperature is January (72.5°F).
- Average low temperature in September: 80.1°F
The month with the highest average low temperature is August (81.5°F).
The coldest month (with the lowest average low temperature) is January (64°F).
Average pressure in September
Sun Valley, FL
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are September and October (29.96"Hg).
Average wind speed in September
Sun Valley, FL
- Average wind speed in September: 8.5mph
The windiest month (with the highest average wind speed) is March (11.5mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).
Average humidity in September
Sun Valley, FL
- Average humidity in September: 75%
The months with the highest relative humidity are June and December (76%).
The month with the lowest relative humidity is March (70%).
Average rainfall in September
Sun Valley, FL
- Average rainfall in September: 7.48"
The wettest month (with the highest rainfall) is August (9.06").
The driest month (with the least rainfall) is January (1.3").
Average rainfall days in September
Sun Valley, FL
- Average rainfall days in September: 26.8 days
The month with the highest number of rainy days is August (27.3 days).
The month with the least rainy days is February (13.3 days).
Average daylight in September /
Average sunshine in September
Sun Valley, 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 42min).
The months with the least sunshine are January and December (Average sunshine: 6h and 0min).
Average sunshine days in September
Sun Valley, FL
- Average sunshine days in September: 2.8 days
The month with the most sunshine days is March (12.7 days).
The month with the least sunshine days is July (2.3 days).
Average UV index in September
Sun Valley, 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
Sun Valley, FL
- Average cloud cover in September: 32
The months with the most cloud cover are January, October, November and December (Cloud cover 36).
The months with the least cloud cover are April and July (Cloud cover 29).
Average visibility in September
Sun Valley, 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).
Sun Valley, Florida, USA
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