Last updated: August 23, 2025
In San Juan Ostuncalco, Guatemala, the average temperature in September hovers around 21°C (69°F), with a mild range between a minimum of 16°C (60°F) and a maximum of 28°C (82°F). Expect a substantial precipitation amount of 604 mm (23.8 in) over the course of the month, complemented by an average humidity level of 82%. Prepare for a wet and warm experience!
In September in San Juan Ostuncalco, the average temperature is 21°C (69°F), with maximums reaching 28°C (82°F) and minimums dipping as low as 16°C (60°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities in San Juan Ostuncalco.
In San Juan Ostuncalco in September, the total precipitation amount reaches 604 mm (23.8 in) over the span of 30 days.
In San Juan Ostuncalco in September humidity is 82%. With an average temperature of 21°C (69°F), this humidity feels like a sweltering embrace, making outdoor activities feel more strenuous and prompting travelers to seek shade and cooling breezes.
In San Juan Ostuncalco 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 Juan Ostuncalco, you can check here.
UV Risk Categories
Weather in San Juan Ostuncalco varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Juan Ostuncalco, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 19°C (67°F) | 51 mm (2.0 inches) | 76% | extreme |
| February Weather | 20°C (68°F) | 62 mm (2.5 inches) | 68% | extreme |
| March Weather | 20°C (68°F) | 134 mm (5.3 inches) | 59% | extreme |
| April Weather | 21°C (69°F) | 248 mm (9.8 inches) | 57% | extreme |
| May Weather | 21°C (70°F) | 702 mm (27.6 inches) | 65% | extreme |
| June Weather | 21°C (70°F) | 561 mm (22.1 inches) | 66% | extreme |
| July Weather | 21°C (70°F) | 461 mm (18.2 inches) | 75% | extreme |
| August Weather | 21°C (70°F) | 588 mm (23.1 inches) | 82% | extreme |
| September Weather | 21°C (69°F) | 604 mm (23.8 inches) | 82% | extreme |
| October Weather | 21°C (69°F) | 528 mm (20.8 inches) | 83% | extreme |
| November Weather | 20°C (69°F) | 224 mm (8.8 inches) | 80% | extreme |
| December Weather | 20°C (68°F) | 71 mm (2.8 inches) | 76% | very high |