September weather forecast
St. Augustine, FL

Palm trees and colorful houses in front of water fountains in a popular town square in St. Augustine, Florida
Palm trees and colorful houses in front of water fountains in a popular town square in St. Augustine, Florida

Weather in September

The first month of the autumn, September, is still a tropical month in St. Augustine, with an average temperature fluctuating between 86°F (30°C) and 71.1°F (21.7°C).

Temperature

In September, the average high-temperature in St. Augustine is practically the same as in August - a still hot 86°F (30°C). In September, in St. Augustine, the average low-temperature is 71.1°F (21.7°C).

Rainfall

September is the month with the most rainfall in St. Augustine. Rain falls for 13 days and accumulates 7.52" (191mm) of precipitation.

Ocean temperature

In St. Augustine, the average water temperature is 83.1°F (28.4°C).
Note: 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.

Daylight

In St. Augustine, the average length of the day in September is 12h and 20min.
On the first day of the month, sunrise is at 7:02 am and sunset at 7:47 pm. On the last day of September, in St. Augustine, sunrise is at 7:18 am and sunset at 7:12 pm EDT.

Sunshine

In St. Augustine, the average sunshine in September is 8h.

UV index

The average daily maximum UV index in September in St. Augustine, Florida, is 9. A UV Index reading of 8 to 10 represents a very high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 9 translate into the following recommendations:
Take extra precautions. Protection against sun damage is required. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in September in St. Augustine?

In St. Augustine, Florida, in September, the average high-temperature is 86°F (30°C), and the average low-temperature is 71.1°F (21.7°C).

What is the rainiest month in St. Augustine?

The month with the most rainfall in St. Augustine is September, when the rain falls for 13 days and typically aggregates up to 7.52" (191mm) of precipitation.

How much does it rain in St. Augustine in September?

In St. Augustine, in September, during 13 rainfall days, 7.52" (191mm) of precipitation is typically accumulated.

How warm is the water in September in St. Augustine?

In St. Augustine, Florida, the average seawater temperature in September is 83.1°F (28.4°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 St. Augustine have in September?

In September, the average day length in St. Augustine, Florida, is 12h and 20min.

When are sunrise and sunset in September in St. Augustine?

On the first day of September in St. Augustine, Florida, sunrise is at 7:02 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:12 pm EDT.

How long on average sun shines in September in St. Augustine?

In St. Augustine, the average sunshine duration in September is 8h.

What is the UV index reading in September in St. Augustine?

In September, the average daily maximum UV index in St. Augustine, Florida, is 9. A UV Index value of 8 to 10 symbolizes a very high health threat from exposure to Sun's UV rays.
Average rainfall days
Average sunshine
Average UV index

Average temperature in September
St. Augustine, FL

Average temperature in September - St. Augustine, FL
  • Average high temperature in September: 86°F

The warmest month (with the highest average high temperature) is July (90°F).
The month with the lowest average high temperature is January (66°F).

  • Average low temperature in September: 71°F

The month with the highest average low temperature is August (73°F).
The coldest month (with the lowest average low temperature) is January (46°F).

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Average rainfall in September
St. Augustine, FL

Average rainfall in September - St. Augustine, FL
  • Average rainfall in September: 7.5"

The wettest month (with the highest rainfall) is September (7.5").
The driest month (with the least rainfall) is November (2.3").

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Average rainfall days in September
St. Augustine, FL

Average rainfall days in September - St. Augustine, FL
  • Average rainfall days in September: 13 days

The months with the highest number of rainy days are July and August (15 days).
The month with the least rainy days is April (6 days).

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Average sea temperature in September
St. Augustine, FL

Average sea temperature in September - St. Augustine, FL
  • Average sea temperature in September: 83.2°F

The best month for swimming (with the highest average sea temperature) is August (83.8°F).
The coldest months (with the lowest average sea temperature) are January and February (64.3°F).

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Average daylight in September /
Average sunshine in September
St. Augustine, FL

Average daylight in September / Average sunshine in September - St. Augustine, FL
  • Average daylight in September: 12h and 20min

The month with the longest days is June (Average daylight: 14h and 2min).
The month with the shortest days is December (Average daylight: 10h and 16min).

  • Average sunshine in September: 8h

The months with the most sunshine are March, April, May, June, July and August (Average sunshine: 9h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average UV index in September
St. Augustine, FL

Average UV index in September - St. Augustine, FL
  • Average UV index in September: 9

The months with the highest UV index are June and July (UV index 11).
The months with the lowest UV index are January and December (UV index 4).

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