Saint Petersburg
Florida, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Saint Petersburg, FL

Scenic palm trees and a straight road to St. Petersburg in Florida, a beautiful clear waterfront, on a hot and sunny day with cloudy sky
Scenic palm trees and a straight road to St. Petersburg in Florida, a beautiful clear waterfront, on a hot and sunny day with cloudy sky
The first month of the autumn, September, is still a tropical month in Saint Petersburg, Florida, with average temperature ranging between min 75°F (23.9°C) and max 89.1°F (31.7°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a still hot 89.1°F (31.7°C). In September, in Saint Petersburg, the average low-temperature is 75°F (23.9°C).

Rainfall

In Saint Petersburg, it is raining for 12 days, with typically 6.1" (154.9mm) of accumulated precipitation. Throughout the year, in Saint Petersburg, there are 105 rainfall days, and 45.9" (1165.8mm) of precipitation is accumulated.

Ocean temperature

In September, the average ocean temperature is 84.7°F (29.3°C).
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The average length of the day in September is 12.3h.

Sunshine

In September, the average sunshine in Saint Petersburg is 8h.

UV index

In September, the average daily maximum UV index in Saint Petersburg is 10. A UV Index reading of 8 to 10 represents a very high health vulnerability from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 10 in September transform into the following instructions:
Take special precautions, as unprotected skin can be damaged and can burn quickly. 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. A wide-brim hat offers excellent sun protection for 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. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in September in Saint Petersburg?

In Saint Petersburg, Florida, in September, the average high-temperature is 89.1°F (31.7°C), and the average low-temperature is 75°F (23.9°C).

How much does it rain in Saint Petersburg in September?

In Saint Petersburg, during September, the rain falls for 12 days and regularly aggregates up to 6.1" (154.9mm) of precipitation.

What is the water temperature in September in Saint Petersburg?

In September, the average ocean temperature in Saint Petersburg 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.

What is the average length of the day in September in Saint Petersburg?

In Saint Petersburg, Florida, the average length of the day in September is 12.3h.

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

In Saint Petersburg, Florida, the average sunshine in September is 8h.

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

In September, the average daily maximum UV index is 10. A UV Index value of 8 to 10 symbolizes a very high hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Saint Petersburg, FL
  • Average high temperature in September: 89°F

Warmest months (with the highest average high temperature) are July and August (90°F).
The month with the lowest average high temperature is January (70°F).

  • Average low temperature in September: 75°F

Months with the highest average low temperature are July and August (76°F).
The coldest month (with the lowest average low temperature) is January (53°F).

Average rainfall in September - Saint Petersburg, FL
  • Average rainfall in September: 6.1"

The wettest month (with the highest rainfall) is August (7.8").
The driest month (with the lowest rainfall) is April (1.6").

Average rainfall days in September - Saint Petersburg, FL
  • Average rainfall days in September: 12 days

The month with the highest number of rainy days is August (17 days).
The month with the lowest number of rainy days is April (4 days).

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).

Average daylight in September / Average sunshine in September - Saint Petersburg, FL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.9h).
The month with shortest days is December (Average daylight: 10.4h).

  • Average sunshine in September: 8h

Months with most sunshine are April and May (Average sunshine: 10h).
The month with least sunshine is December (Average sunshine: 6h).

Average UV index in September - Saint Petersburg, FL
  • Average UV index in September: 10

Months with the highest UV index are May, June, July and August (UV index 11).
Months with the lowest UV index are January and December (UV index 5).