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
Harlem experiences a recorded average high-temperature of a still tropical 87.4°F (30.8°C) in September, closely aligned with August's 89.6°F (32°C). An average low-temperature of 74.7°F (23.7°C) is common during the nights of September.Heat index
In September, the heat index is calculated to be an extremely hot 105.8°F (41°C). Exercise enhanced safety steps, heat cramps and heat exhaustion are probable. Heatstroke could be a result of sustained activity.Take note of the fact that heat index values are based on shaded circumstances with light airflows. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.
Humidity
With an average relative humidity of 81%, September is the most humid month.Rainfall
In Harlem, in September, it is raining for 19.9 days, with typically 1.54" (39mm) of accumulated precipitation. Throughout the year, there are 166.9 rainfall days, and 16.06" (408mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 18min.On the first day of September, sunrise is at 7:03 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 7:10 pm EDT.
Sunshine
In Harlem, the average sunshine in September is 8.8h.UV index
May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum UV index of 7 during September leads to these instructions:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. 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 does it get in September?
What is the most humid month?
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?
When are sunrise and sunset in September in Harlem?
How long on average sun shines in September?
What are the months with the highest UV index?
What is the UV index reading in September?
Average temperature in September
Harlem, FL
- Average high temperature in September: 87.4°F
The warmest month (with the highest average high temperature) is August (89.6°F).
The month with the lowest average high temperature is January (72.3°F).
- Average low temperature in September: 74.7°F
The month with the highest average low temperature is August (76.5°F).
The coldest month (with the lowest average low temperature) is January (56.1°F).
Average pressure in September
Harlem, FL
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is September (29.95"Hg).
Average wind speed in September
Harlem, FL
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is March (7.1mph).
The calmest month (with the lowest average wind speed) is July (4.7mph).
Average humidity in September
Harlem, FL
- Average humidity in September: 81%
The month with the highest relative humidity is September (81%).
The month with the lowest relative humidity is March (70%).
Average rainfall in September
Harlem, FL
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is August (3.19").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Harlem, FL
- Average rainfall days in September: 19.9 days
The month with the highest number of rainy days is August (22.3 days).
The month with the least rainy days is January (6.8 days).
Average daylight in September /
Average sunshine in September
Harlem, 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 month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 6h and 12min).
Average sunshine days in September
Harlem, FL
- Average sunshine days in September: 5.6 days
The month with the most sunshine days is January (20.3 days).
The month with the least sunshine days is August (4.3 days).
Average UV index in September
Harlem, 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, February and December (UV index 5).
Average cloud cover in September
Harlem, FL
- Average cloud cover in September: 33
The months with the most cloud cover are January, November and December (Cloud cover 34).
The months with the least cloud cover are March, April and May (Cloud cover 29).
Average visibility in September
Harlem, 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).
Harlem, Florida, USA
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