The weather in September in San Antonio

It's hot in September in San Antonio with an average temperature of 32°C. Temperatures this month range from a low of 31°C to a high of 33°C. At night, you can expect temperatures between 25°C and 27°C.

Looking for sun? September isn’t a good month to be in San Antonio. The temperature is nice, but there’s too much chance of rain.

Average temperatures and precipitation

This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for San Antonio, Puerto Rico. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.

Temperature records

With 35°C in 2023, San Antonio reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 27°C in 2022. The extreme nighttime temperatures ranged from a lowest recorded value of 23°C to a highest value of 29°C.

Rainfall amount

In September, there is an average of 231 mm of precipitation, spread over 22 days. The wind speed is around 4 Bft, mostly coming from the East.

Daily weather in September for San Antonio

Click on any day in September to get detailed info about the usual weather on that day in San Antonio. Check out the historical temperatures and precipitation over the past 10 years on this day.

1

32° / 26°

2

32° / 27°

3

32° / 27°

4

32° / 27°

5

32° / 27°

6

32° / 27°

7

31° / 26°

8

32° / 26°

9

32° / 27°

10

32° / 27°

11

32° / 27°

12

32° / 27°

13

33° / 27°

14

32° / 27°

15

32° / 27°

16

32° / 27°

17

32° / 27°

18

32° / 26°

19

32° / 25°

20

32° / 26°

21

32° / 27°

22

32° / 26°

23

33° / 26°

24

32° / 27°

25

32° / 26°

26

31° / 26°

27

32° / 26°

28

32° / 26°

29

33° / 26°

30

33° / 26°

Start of September

The month of September starts in San Antonio with hot temps, averaging around 32°C during the day and nights around 27°C.

Mid September

By mid-September, daytime temps rise to around 33°C, with nights around 27°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.

End of September

By the end of September, the average daytime temperature in San Antonio is around 33°C, while nighttime temps are about 27°C. There’s a significant chance of many days with precipitation.

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UV index

The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.

The hurricane season in San Antonio runs from June to November.

Check out the climate of San Antonio for all months and discover the best travel time

Temperature charts

These charts show the average temperatures in September in San Antonio, Puerto Rico. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.

Daily Temperature in September in San Antonio

Temperature in September in San Antonio over the years

Precipitation charts

These charts show the average amount of precipitation in September in San Antonio, Puerto Rico. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.

Daily Precipitation in September in San Antonio

Total precipitation in September in San Antonio over the years

Daily UV index in September in San Antonio

This chart shows the average daily UV index in September in San Antonio, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.

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Average weather in San Antonio by month

Click on a month below to see detailed weather info for San Antonio. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.