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 snowfall 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
In September, the average high-temperature registers at a still hot 88.2°F (31.2°C), nearly identical to August's 90.1°F (32.3°C). An average nighttime temperature of 72.7°F (22.6°C) is noted during the month of September.Heat index
The heat index for September is evaluated at a scorching 105.8°F (41°C). Adopt special protective actions against heat exhaustion and heat cramps. Long-duration activity risks heatstroke.Keep in mind the heat index values are meant for areas in shade and with light wind. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.
Humidity
The months with the highest humidity are July through September, with an average relative humidity of 78%.Rainfall
In September, in Lake Weir, the rain falls for 18.5 days. Throughout September, 1.93" (49mm) of precipitation is accumulated. Throughout the year, there are 159.3 rainfall days, and 21.1" (536mm) of precipitation is accumulated.Snowfall
February through December are months without snowfall.Daylight
In September, the average length of the day is 12h and 19min.On the first day of the month, sunrise is at 7:05 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:20 am and sunset at 7:14 pm EDT.
Sunshine
The average sunshine in September in Lake Weir is 8.6h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum high UV index of 6 in September translates into the following recommendations:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What are the most humid months?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Lake Weir have in September?
What is the UV index intensity in September?
Average temperature in September
Lake Weir, FL
- Average high temperature in September: 88.2°F
The warmest months (with the highest average high temperature) are July and August (90.1°F).
The month with the lowest average high temperature is January (66.6°F).
- Average low temperature in September: 72.7°F
The month with the highest average low temperature is August (75.6°F).
The coldest month (with the lowest average low temperature) is January (48.7°F).
Average pressure in September
Lake Weir, FL
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.97"Hg).
Average wind speed in September
Lake Weir, FL
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is July (4.7mph).
Average humidity in September
Lake Weir, FL
- Average humidity in September: 78%
The months with the highest relative humidity are July, August and September (78%).
The month with the lowest relative humidity is March (71%).
Average rainfall in September
Lake Weir, FL
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is July (3.82").
The driest month (with the least rainfall) is March (0.71").
Average rainfall days in September
Lake Weir, FL
- Average rainfall days in September: 18.5 days
The month with the highest number of rainy days is July (21.9 days).
The month with the least rainy days is November (7 days).
Average snowfall days in September
Lake Weir, FL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Lake Weir, FL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is May (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in September
Lake Weir, FL
- Average sunshine days in September: 9.8 days
The month with the most sunshine days is January (21.7 days).
The month with the least sunshine days is July (6.3 days).
Average UV index in September
Lake Weir, FL
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 4).
Average cloud cover in September
Lake Weir, FL
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 38).
The month with the least cloud cover is May (Cloud cover 29).
Average visibility in September
Lake Weir, 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).
Lake Weir, Florida, USA
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