September weather forecast
Saint Petersburg, FL

Beautiful clear waterfront, scenic palm trees, and a straight road to St. Petersburg in Florida
Beautiful clear waterfront, scenic palm trees, and a straight road to St. Petersburg in Florida

Weather in September

The first month of the autumn, September, is still a tropical month in Saint Petersburg, Florida, with an average temperature varying between 77.2°F (25.1°C) and 87.3°F (30.7°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still hot 87.3°F (30.7°C). In Saint Petersburg, the average low-temperature is 77.2°F (25.1°C).

Heat index

In September, the average heat index is evaluated at a very hot 100.4°F (38°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like differences in body mass, height, and shape, wind, pregnancy, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for 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 human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Saint Petersburg, during 21.7 rainfall days, 3.46" (88mm) of precipitation is typically accumulated. In Saint Petersburg, during the entire year, the rain falls for 172.1 days and collects up to 27.2" (691mm) of precipitation.

Ocean temperature

In September, the average ocean temperature is 84.7°F (29.3°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

The average length of the day in September is 12h and 19min.
On the first day of September, sunrise is at 7:09 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:18 pm EDT.

Sunshine

In Saint Petersburg, the average sunshine in September is 9.1h.

UV index

The months with the highest UV index in Saint Petersburg are May through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the temperature in September in Saint Petersburg?

The average high-temperature, in September, is 87.3°F (30.7°C), while the average low-temperature is 77.2°F (25.1°C). in September, the average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, is evaluated at 100.4°F (38°C).

What is the average humidity in September in Saint Petersburg?

The average relative humidity in September in Saint Petersburg, Florida, is 74%.

How many days does it rain in September in Saint Petersburg?

In Saint Petersburg, Florida, during September, the rain falls for 21.7 days and regularly aggregates up to 3.46" (88mm) of precipitation.

What is the ocean temperature in September in Saint Petersburg?

In September, the average ocean temperature in Saint Petersburg, Florida, is 84.7°F (29.3°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Saint Petersburg have in September?

In Saint Petersburg, Florida, the average day length in September is 12h and 19min.

When are sunrise and sunset in September in Saint Petersburg?

In September, on the first day of the month, sunrise is at 7:09 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:18 pm EDT.

How long on average sun shines in September in Saint Petersburg?

In Saint Petersburg, Florida, the average sunshine duration in September is 9.1h.

What is the month with the highest UV index in Saint Petersburg?

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

What is the UV index reading in September in Saint Petersburg?

In September, the average daily maximum UV index in Saint Petersburg, Florida, is 7. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to Sun's UV rays.

Average temperature in September
Saint Petersburg, FL

Average temperature in September - Saint Petersburg, FL
  • Average high temperature in September: 87.3°F

The warmest month (with the highest average high temperature) is August (88.7°F).
The month with the lowest average high temperature is January (67.6°F).

  • Average low temperature in September: 77.2°F

The month with the highest average low temperature is August (79.5°F).
The coldest month (with the lowest average low temperature) is January (55.2°F).

[Resources]

Average pressure in September
Saint Petersburg, FL

Average pressure in September - Saint Petersburg, 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).

[Resources]

Average wind speed in September
Saint Petersburg, FL

Average wind speed in September - Saint Petersburg, FL
  • Average wind speed in September: 7.1mph

The windiest months (with the highest average wind speed) are January, March, October and November (8.9mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).

[Resources]

Average humidity in September
Saint Petersburg, FL

Average humidity in September - Saint Petersburg, FL
  • Average humidity in September: 74%

The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is May (71%).

[Resources]

Average rainfall in September
Saint Petersburg, FL

Average rainfall in September - Saint Petersburg, FL
  • Average rainfall in September: 3.46"

The wettest month (with the highest rainfall) is July (5.24").
The driest months (with the least rainfall) are February and November (0.75").

[Resources]

Average rainfall days in September
Saint Petersburg, FL

Average rainfall days in September - Saint Petersburg, FL
  • Average rainfall days in September: 21.7 days

The month with the highest number of rainy days is July (26.2 days).
The month with the least rainy days is November (7 days).

[Resources]

Average sea temperature in September
Saint Petersburg, FL

Average sea temperature in September - Saint Petersburg, FL
  • Average sea temperature in September: 84.7°F

The best month for swimming (with the highest average sea temperature) is August (86.7°F).
The coldest month (with the lowest average sea temperature) is January (64°F).

[Resources]

Average daylight in September /
Average sunshine in September
Saint Petersburg, FL

Average daylight in September / Average sunshine in September - Saint Petersburg, FL
  • Average daylight in September: 12h and 19min

The month with the longest days is June (Average daylight: 13h and 52min).
The month with the shortest days is December (Average daylight: 10h and 25min).

  • Average sunshine in September: 9h and 6min

The month with the most sunshine is May (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

[Resources]

Average sunshine days in September
Saint Petersburg, FL

Average sunshine days in September - Saint Petersburg, FL
  • Average sunshine days in September: 5.3 days

The month with the most sunshine days is January (22.1 days).
The month with the least sunshine days is July (3.1 days).

[Resources]

Average UV index in September
Saint Petersburg, FL

Average UV index in September - Saint Petersburg, 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).

[Resources]

Average cloud cover in September
Saint Petersburg, FL

Average cloud cover in September - Saint Petersburg, FL
  • Average cloud cover in September: 27

The month with the most cloud cover is December (Cloud cover 30).
The month with the least cloud cover is May (Cloud cover 21).

[Resources]

Average visibility in September
Saint Petersburg, FL

Average visibility in September - Saint Petersburg, 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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location