Last updated: August 27, 2025
In September, the average temperature in San Cristobal, Peru hovers around 3°C (38°F). Expect a minimum of -5°C (22°F) and a comfortable maximum of 12°C (53°F). Be prepared for some rain, as 99 mm (3.9 in) of precipitation is likely over about 23 days. Don't forget, the average humidity is around 40%, adding a bit of chill to the air!
In September in San Cristobal, the average temperature is 3°C (38°F). The maximum can reach 12°C (53°F) and the minimum can be as low as -5°C (22°F). Travelers should be prepared for chilly weather and pack accordingly, ensuring they have suitable clothing for both mild and cold conditions.
In San Cristobal in September, the total precipitation amount is 99 mm (3.9 in), occurring over the course of 23 days.
In San Cristobal in September, humidity is 40%. With an average temperature of 3°C (38°F), this humidity feels like a crisp, invigorating chill that sharpens the senses, making it perfect for outdoor exploration and invigorating walks, although travelers should be prepared for the bite of cold air.
In San Cristobal in September, the maximum UV index is 18, which corresponds to an extreme exposure category. This means that the time to burn is just 10 minutes. For more detailed information, you can check the hourly UV index in San Cristobal.
UV Risk Categories
Weather in San Cristobal varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Cristobal, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (40°F) | 219 mm (8.6 inches) | 91% | extreme |
| February Weather | 4°C (40°F) | 255 mm (10.0 inches) | 90% | extreme |
| March Weather | 4°C (40°F) | 294 mm (11.6 inches) | 91% | extreme |
| April Weather | 4°C (40°F) | 146 mm (5.8 inches) | 89% | extreme |
| May Weather | 4°C (39°F) | 91 mm (3.6 inches) | 85% | extreme |
| June Weather | 3°C (38°F) | 32 mm (1.3 inches) | 65% | extreme |
| July Weather | 2°C (37°F) | 26 mm (1.0 inches) | 47% | extreme |
| August Weather | 3°C (37°F) | 45 mm (1.8 inches) | 38% | extreme |
| September Weather | 3°C (38°F) | 99 mm (3.9 inches) | 40% | extreme |
| October Weather | 4°C (39°F) | 156 mm (6.2 inches) | 56% | extreme |
| November Weather | 5°C (41°F) | 197 mm (7.8 inches) | 76% | extreme |
| December Weather | 5°C (41°F) | 236 mm (9.3 inches) | 90% | extreme |