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September Weather in San Cristobal, Peru

Last updated: August 27, 2025

The average temperature in San Cristobal, Peru during September is a comfortable 11°C (52°F). Expect minimums dropping to -2°C (29°F) and maximums rising to 21°C (70°F). Precipitation is light, with about 5 mm (0.2 in) over the course of 1 day. Humidity averages around 58%, creating a pleasant environment for your visits!

September Temperature in San Cristobal

In September in San Cristobal, the average temperature is 11°C (52°F). The maximum can reach 21°C (70°F), while the minimum can drop as low as -2°C (29°F). Be prepared for diverse weather conditions and pack accordingly for your trip!

September Weather in San Cristobal: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in San Cristobal, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Cristobal, September typically has an average temperature of 11°C (52°F), with highs reaching up to 21°C (70°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec494848484948484952525251
Data source: Temperature data for San Cristobal generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in San Cristobal

In San Cristobal in September, the precipitation amount is 5 mm (0.2 in) over a duration of 1 day.

September Precipitation Trends in San Cristobal

The chart displays monthly precipitation patterns in San Cristobal, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In San Cristobal, September typically receives around 5 mm (0.2 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec2302442105261215173592
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Cristobal

In San Cristobal in September humidity is 58%. With an average temperature of 11°C (52°F), this humidity feels like a cool, crisp embrace, making it quite pleasant for traveling as long as you're dressed appropriately for the slightly damp conditions.

September Average Humidity in San Cristobal

This chart illustrates the average monthly humidity levels in San Cristobal, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in San Cristobal is approximately 58%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%90%91%88%76%61%57%59%75%84%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Cristobal

In San Cristobal in September, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in San Cristobal.

Maximum UV Index Levels in San Cristobal for September

The chart shows the monthly maximum UV Index (UVI) for San Cristobal in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in San Cristobal typically reaches 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec181917151210111416181818
Data source: San Cristobal September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in San Cristobal Compares to Other Months

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.

This table compares monthly weather conditions in San Cristobal, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (49°F)230 mm (9.1 inches)89%extreme
February Weather9°C (49°F)244 mm (9.6 inches)90%extreme
March Weather9°C (49°F)209 mm (8.2 inches)90%extreme
April Weather9°C (49°F)52 mm (2.0 inches)91%extreme
May Weather9°C (49°F)6 mm (0.2 inches)88%extreme
June Weather9°C (48°F)1 mm (0.1 inches)76%very high
July Weather9°C (48°F)2 mm (0.1 inches)61%extreme
August Weather9°C (49°F)1 mm (0.1 inches)57%extreme
September Weather11°C (52°F)5 mm (0.2 inches)58%extreme
October Weather11°C (53°F)17 mm (0.7 inches)75%extreme
November Weather11°C (52°F)35 mm (1.4 inches)83%extreme
December Weather11°C (51°F)92 mm (3.6 inches)84%extreme

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