September Weather in San Juan

Last updated: March 2, 2024

The weather in San Juan, Peru, during September is characterized by an average temperature of 15°C (58°F). Highs can soar to 19°C (66°F), while lows may dip to 12°C (53°F). Typically, the humidity level in San Juan throughout September hovers around 74%.

12°C (53°F)

Minimum temperature

15°C (58°F)

Average temperature

19°C (66°F)

Maximum temperature

74%

Humidity

Precipitation and Sunshine hours

In September, San Juan averages 6 mm (0.2 inches) of rainfall, typically over the course of 0 rainy days. The month enjoys an average of 12 hours 0 minutes of daylight, with the sun shining for approximately 10 hours 35 minutes each day. Additionally, there is a 31% probability of sunny days during this period.

6 mm (0.2 inches)

Precipitation

0 rainy days

Rainy days

10 hours 35 minutes

Sunshine hours

31%

Chance of sun

UV Index

In September, the UV Index in San Juan reaches a maximum of 13, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 10 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 1 3 7 10 12 13 11 8 5 2 1 0 0
Exposure Low Moderate High VeryHigh Extreme VeryHigh Moderate Low
Time to burn 45 min 30 min 25 min 15 min 10 min 15 min 30 min 45 min

Compare San Juan's Climate with Cities Worldwide