September weather forecast
Dover, FL

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Weather in September

The first month of the autumn, September, is still a hot month in Dover, Florida, with an average temperature ranging between min 73.9°F (23.3°C) and max 88.3°F (31.3°C).

Temperature

The shift into September uncovers an average high-temperature of a still hot 88.3°F (31.3°C), subtly different from the previous month. September nights are marked by an average low-temperature of 73.9°F (23.3°C).

Heat index

During September, the heat index is computed to be a blisteringly hot 105.8°F (41°C). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Be aware that heat index ratings are designed for shaded locations and minor breezes. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a composite of temperature and humidity figures to convey how warm it feels. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

With an average relative humidity of 78%, September is the most humid month.

Rainfall

In Dover, in September, during 23 rainfall days, 4.45" (113mm) of precipitation is typically accumulated. In Dover, during the entire year, the rain falls for 192.2 days and collects up to 37.91" (963mm) of precipitation.

Daylight

In September, the average length of the day is 12h and 19min.
On the first day of the month, sunrise is at 7:07 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:21 am and sunset at 7:15 pm EDT.

Sunshine

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 estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 7 translates into the following recommendations:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.

Frequently asked questions

How hot is September?

The average high-temperature, in September, in Dover, is 88.3°F (31.3°C), while the average low-temperature is 73.9°F (23.3°C). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is computed to be 105.8°F (41°C).

What is the most humid month?

With an average relative humidity of 78%, September is the most humid month.

What is the average humidity in September?

In Dover, the average relative humidity in September is 78%.

How much does it rain in September?

In Dover, in September, during 23 rainfall days, 4.45" (113mm) of precipitation is typically accumulated.

How many hours of daylight does Dover have in September?

In Dover, the average day length in September is 12h and 19min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 7:07 am and sunset at 7:49 pm. On the last day of the month, in Dover, sunrise is at 7:21 am and sunset at 7:15 pm EDT.

How many hours of sunshine does Dover have in September?

In September, the average sunshine duration is 8.8h.

When is the highest UV index?

The months with the highest UV index are May through September, with an average maximum UV index of 7.

How high is the UV index in September?

In Dover, the average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Dover, FL

Average temperature in September - Dover, FL
  • Average high temperature in September: 88.3°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 (68.9°F).

  • Average low temperature in September: 73.9°F

The month with the highest average low temperature is August (76.6°F).
The coldest month (with the lowest average low temperature) is January (51.8°F).

Average pressure in September
Dover, FL

Average pressure in September - Dover, 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
Dover, FL

Average wind speed in September - Dover, FL
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is March (6.9mph).
The calmest month (with the lowest average wind speed) is July (4.8mph).

Average humidity in September
Dover, FL

Average humidity in September - Dover, FL
  • Average humidity in September: 78%

The month with the highest relative humidity is September (78%).
The months with the lowest relative humidity are March and May (71%).

Average rainfall in September
Dover, FL

Average rainfall in September - Dover, FL
  • Average rainfall in September: 4.45"

The wettest month (with the highest rainfall) is August (6.93").
The driest month (with the least rainfall) is February (1.22").

Average rainfall days in September
Dover, FL

Average rainfall days in September - Dover, FL
  • Average rainfall days in September: 23 days

The month with the highest number of rainy days is August (27.3 days).
The month with the least rainy days is February (8.8 days).

Average daylight in September /
Average sunshine in September
Dover, FL

Average daylight in September / Average sunshine in September - Dover, 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: 8h and 5min

The month with the most sunshine is May (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 6h and 12min).

Average sunshine days in September
Dover, FL

Average sunshine days in September - Dover, FL
  • Average sunshine days in September: 5.1 days

The month with the most sunshine days is January (20.3 days).
The month with the least sunshine days is August (2.7 days).

Average UV index in September
Dover, FL

Average UV index in September - Dover, 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
Dover, FL

Average cloud cover in September - Dover, FL
  • Average cloud cover in September: 32

The month with the most cloud cover is February (Cloud cover 35).
The month with the least cloud cover is May (Cloud cover 26).

Average visibility in September
Dover, FL

Average visibility in September - Dover, 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).

Dover, Florida, USA

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