Last updated: August 22, 2025
In San Antonio, Belize, the average temperature in September hovers around 27°C (81°F), making it a warm destination. Expect minimum temperatures to dip to 21°C (71°F), while highs can soar to 36°C (97°F). However, prepare for some moisture, as precipitation averages 139 mm (5.5 in) spread over 26 days of the month, and the humidity remains notably high at 82%.
In September in San Antonio, the average temperature is 27°C (81°F). The maximum can reach 36°C (97°F), and the minimum can be as low as 21°C (71°F). This warm weather makes San Antonio an ideal destination for travelers seeking sunshine and pleasant outdoor activities.
In San Antonio in September, the total precipitation amount is 139 mm (5.5 in) spread out over 26 days.
In San Antonio in September humidity is 82%. With an average temperature of 27°C (81°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel more exhausting, and leaving you longing for the relief of air-conditioned spaces during your travels.
In San Antonio in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in San Antonio.
UV Risk Categories
Weather in San Antonio varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Antonio, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 23°C (73°F) | 68 mm (2.7 inches) | 85% | very high |
| February Weather | 24°C (76°F) | 50 mm (2.0 inches) | 78% | extreme |
| March Weather | 25°C (77°F) | 65 mm (2.5 inches) | 67% | extreme |
| April Weather | 27°C (81°F) | 57 mm (2.3 inches) | 62% | extreme |
| May Weather | 28°C (82°F) | 106 mm (4.2 inches) | 62% | extreme |
| June Weather | 27°C (81°F) | 172 mm (6.8 inches) | 63% | extreme |
| July Weather | 27°C (81°F) | 122 mm (4.8 inches) | 66% | extreme |
| August Weather | 27°C (81°F) | 130 mm (5.1 inches) | 73% | extreme |
| September Weather | 27°C (81°F) | 139 mm (5.5 inches) | 82% | extreme |
| October Weather | 26°C (79°F) | 219 mm (8.6 inches) | 86% | extreme |
| November Weather | 24°C (76°F) | 138 mm (5.5 inches) | 87% | very high |
| December Weather | 23°C (74°F) | 65 mm (2.6 inches) | 87% | very high |