Last updated: August 27, 2025
In San Sebastian del Sur, Mexico, the average temperature in September hovers around 19°C (67°F), with a minimum of 14°C (57°F) and a maximum of 29°C (84°F). This month typically sees 223 mm (8.8 in) of precipitation over about 25 days. With an average humidity of 83%, be prepared for a humid and rainy atmosphere!
In September in San Sebastian del Sur, the average temperature is 19°C (67°F). Maximum temperatures can reach 29°C (84°F), while minimums can drop to as low as 14°C (57°F). This mild climate makes San Sebastian del Sur an ideal destination for travelers looking to enjoy pleasant weather during this time of year.
In San Sebastian del Sur in September, the precipitation amount is 223 mm (8.8 in) over the course of 25 days.
In San Sebastian del Sur in September humidity is 83%. With an average temperature of 19°C (67°F), this humidity feels like a warm, tropical blanket wrapping around you, making traveling feel a bit sluggish and sticky, yet still inviting as long as you stay hydrated and take breaks in the shade.
In San Sebastian del Sur in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Sebastian del Sur, you can check here.
UV Risk Categories
Weather in San Sebastian del Sur varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Sebastian del Sur, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 16°C (61°F) | 11 mm (0.4 inches) | 70% | very high |
| February Weather | 17°C (63°F) | 19 mm (0.8 inches) | 65% | extreme |
| March Weather | 19°C (66°F) | 9 mm (0.4 inches) | 59% | extreme |
| April Weather | 20°C (68°F) | 3 mm (0.1 inches) | 60% | extreme |
| May Weather | 21°C (71°F) | 36 mm (1.4 inches) | 67% | extreme |
| June Weather | 21°C (70°F) | 176 mm (6.9 inches) | 80% | extreme |
| July Weather | 20°C (68°F) | 212 mm (8.4 inches) | 81% | extreme |
| August Weather | 20°C (68°F) | 209 mm (8.2 inches) | 83% | extreme |
| September Weather | 19°C (67°F) | 223 mm (8.8 inches) | 83% | extreme |
| October Weather | 19°C (67°F) | 117 mm (4.6 inches) | 80% | extreme |
| November Weather | 18°C (64°F) | 35 mm (1.4 inches) | 77% | very high |
| December Weather | 16°C (61°F) | 10 mm (0.4 inches) | 76% | very high |