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
September's presence records an average high-temperature of a still tropical 88.7°F (31.5°C), closely mirroring August's climate. Riverview experiences an average low-temperature of 75.4°F (24.1°C) in the month of September.Heat index
In September, the average heat index is calculated to be a scorching 105.8°F (41°C). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.Heat index values are typically calculated for conditions of shade and a light breeze. 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 'real feel', marries air temperature and humidity to produce a value illustrating perceived warmth. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.
Humidity
September and December, with an average relative humidity of 76%, are the most humid months.Rainfall
In Riverview, in September, during 18.5 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. Throughout the year, there are 148.4 rainfall days, and 12.32" (313mm) 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 7:08 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:21 am and sunset at 7:16 pm EDT.
Sunshine
In Riverview, the average sunshine in September is 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 value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index, 7 during September, leads to the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September?
What are the most humid months in Riverview?
What is the average humidity in September?
How many days does it rain in September?
What is the average length of the day in September in Riverview?
When are sunrise and sunset in September?
How many hours of sunshine does Riverview have in September?
What is the month with the highest UV index?
What is the UV index reading in September?
Average temperature in September
Riverview, FL
- Average high temperature in September: 88.7°F
The warmest month (with the highest average high temperature) is August (90.1°F).
The month with the lowest average high temperature is January (68.5°F).
- Average low temperature in September: 75.4°F
The month with the highest average low temperature is August (78.1°F).
The coldest month (with the lowest average low temperature) is January (52.7°F).
Average pressure in September
Riverview, FL
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).
Average wind speed in September
Riverview, FL
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is March (7.6mph).
The calmest month (with the lowest average wind speed) is July (5.4mph).
Average humidity in September
Riverview, FL
- Average humidity in September: 76%
The months with the highest relative humidity are September and December (76%).
The months with the lowest relative humidity are March and May (70%).
Average rainfall in September
Riverview, FL
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is July (2.48").
The driest month (with the least rainfall) is March (0.24").
Average rainfall days in September
Riverview, FL
- Average rainfall days in September: 18.5 days
The month with the highest number of rainy days is July (22.8 days).
The month with the least rainy days is January (4.9 days).
Average daylight in September /
Average sunshine in September
Riverview, FL
- Average daylight in September: 12h and 2min
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 May (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in September
Riverview, FL
- Average sunshine days in September: 8.4 days
The month with the most sunshine days is January (24.2 days).
The month with the least sunshine days is July (4.7 days).
Average UV index in September
Riverview, 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
Riverview, FL
- Average cloud cover in September: 29
The months with the most cloud cover are January and December (Cloud cover 31).
The month with the least cloud cover is May (Cloud cover 23).
Average visibility in September
Riverview, 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).
Riverview, Florida, USA
Weather forecast for your location
2. Allow the app to use your location