Last updated: August 27, 2025
In Alto San Ildefonso, Peru, the average temperature in September hovers around 18°C (64°F), with a comfortable range, where the minimum dips to 13°C (57°F) and the maximum reaches 23°C (73°F). The month experiences minimal precipitation, with just 5 mm (0.2 in) spread over 0 days, ensuring plenty of dry weather. With an average humidity of 42%, it's a great time to enjoy the outdoors!
In September in Alto San Ildefonso, the average temperature is 18°C (64°F). The maximum can reach 23°C (73°F) and the minimum can be as low as 13°C (57°F). This mild climate makes it an ideal time for travelers to explore and enjoy outdoor activities in Alto San Ildefonso.
In Alto San Ildefonso in September, the precipitation amount is 5 mm (0.2 in) during a span of 0 days.
In Alto San Ildefonso in September humidity is 42%. With an average temperature of 18°C (64°F), this humidity feels like a refreshing embrace, making it pleasant for traveling as you can enjoy outdoor activities without the stickiness often associated with higher humidity levels.
In Alto San Ildefonso 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 Alto San Ildefonso, you can check here.
UV Risk Categories
Weather in Alto San Ildefonso varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Alto San Ildefonso, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 22°C (72°F) | 30 mm (1.2 inches) | 83% | extreme |
| February Weather | 24°C (75°F) | 41 mm (1.6 inches) | 81% | extreme |
| March Weather | 24°C (75°F) | 63 mm (2.5 inches) | 88% | extreme |
| April Weather | 22°C (72°F) | 24 mm (0.9 inches) | 85% | extreme |
| May Weather | 20°C (69°F) | 10 mm (0.4 inches) | 78% | extreme |
| June Weather | 19°C (67°F) | 2 mm (0.1 inches) | 62% | extreme |
| July Weather | 18°C (65°F) | 3 mm (0.1 inches) | 44% | extreme |
| August Weather | 18°C (65°F) | 3 mm (0.1 inches) | 38% | extreme |
| September Weather | 18°C (64°F) | 5 mm (0.2 inches) | 42% | extreme |
| October Weather | 18°C (65°F) | 9 mm (0.3 inches) | 58% | extreme |
| November Weather | 19°C (66°F) | 10 mm (0.4 inches) | 69% | extreme |
| December Weather | 21°C (69°F) | 30 mm (1.2 inches) | 82% | extreme |