Last updated: June 24, 2025
In San Antonio Heights, United States, the average temperature in September hovers around 23°C (73°F), offering a pleasant climate. However, be prepared for temperature fluctuations, with minimums dipping to 9°C (48°F) and maximums soaring to 42°C (108°F). Additionally, you can expect 6 mm (0.2 in) of precipitation over the course of just 1 day, accompanied by an average humidity level of 48%.
In September in San Antonio Heights, the average temperature is 23°C (73°F). Maximum can reach 42°C (108°F) and minimum can be as low as 9°C (48°F). Be prepared for a wide range of temperatures when traveling during this month, as both heat and cool conditions can occur.
In San Antonio Heights in September, the precipitation amount is 6 mm (0.2 in) over the course of 1 day.
In San Antonio Heights in September humidity is 48%. With an average temperature of 23°C (73°F), this humidity feels like a pleasant embrace, making it comfortable for traveling while allowing you to enjoy outdoor activities without feeling overly sticky or weighed down.
In San Antonio Heights in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in San Antonio Heights.
UV Risk Categories
Weather in San Antonio Heights varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Antonio Heights, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 10°C (50°F) | 77 mm (3.0 inches) | 78% | moderate |
| February Weather | 10°C (50°F) | 73 mm (2.9 inches) | 82% | high |
| March Weather | 11°C (53°F) | 79 mm (3.1 inches) | 75% | very high |
| April Weather | 15°C (59°F) | 25 mm (1.0 inches) | 68% | very high |
| May Weather | 17°C (62°F) | 20 mm (0.8 inches) | 57% | extreme |
| June Weather | 21°C (71°F) | 3 mm (0.1 inches) | 52% | extreme |
| July Weather | 25°C (77°F) | 6 mm (0.2 inches) | 46% | extreme |
| August Weather | 25°C (77°F) | 9 mm (0.4 inches) | 39% | extreme |
| September Weather | 23°C (73°F) | 6 mm (0.2 inches) | 48% | very high |
| October Weather | 18°C (65°F) | 11 mm (0.4 inches) | 59% | high |
| November Weather | 14°C (58°F) | 25 mm (1.0 inches) | 72% | moderate |
| December Weather | 10°C (50°F) | 79 mm (3.1 inches) | 76% | moderate |