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September Weather in San Jose, Peru

Last updated: August 27, 2025

In San Jose, Peru, the average temperature in September hovers around 16°C (60°F). Expect a comfortable range with a minimum of 9°C (48°F) and a maximum reaching 23°C (74°F). During this month, precipitation totals about 133 mm (5.3 in) spread across 28 days, while the humidity stays at a moderate 42%. Prepare accordingly for a blend of mild warmth and occasional rain!

September Temperature in San Jose

In September in San Jose, the average temperature is 16°C (60°F). Maximums can reach 23°C (74°F) and minimums can be as low as 9°C (48°F). It's a great time for travelers to enjoy mild weather while exploring the local attractions.

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

The chart illustrates September temperature patterns in San Jose, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Jose, September typically has an average temperature of 16°C (60°F), with highs reaching up to 23°C (74°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec626362626160595960626363
Data source: Temperature data for San Jose 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 Jose

In San Jose in September, the total precipitation amount is 133 mm (5.3 in) spread over a period of 28 days.

September Precipitation Trends in San Jose

The chart displays monthly precipitation patterns in San Jose, 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 Jose, September typically receives around 133 mm (5.3 inches) of precipitation spread over approximately 28 days.
JanFebMarAprMayJunJulAugSepOctNovDec222222257207157131143142133183167247
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Jose

In San Jose in September humidity is 42%. With an average temperature of 16°C (60°F), this humidity feels like a refreshing breeze, making it a pleasant time for traveling and exploring the area's attractions without feeling overheated.

September Average Humidity in San Jose

This chart illustrates the average monthly humidity levels in San Jose, 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 Jose is approximately 42%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%88%85%78%62%44%38%42%58%69%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Jose

In San Jose 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 Jose.

Maximum UV Index Levels in San Jose for September

The chart shows the monthly maximum UV Index (UVI) for San Jose 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 Jose typically reaches 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec171718181513131416171616
Data source: San Jose 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 Jose Compares to Other Months

Weather in San Jose varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Jose, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Jose, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (62°F)222 mm (8.8 inches)83%extreme
February Weather17°C (63°F)221 mm (8.7 inches)81%extreme
March Weather17°C (62°F)257 mm (10.1 inches)88%extreme
April Weather16°C (62°F)207 mm (8.1 inches)85%extreme
May Weather16°C (62°F)157 mm (6.2 inches)78%extreme
June Weather16°C (61°F)131 mm (5.1 inches)62%extreme
July Weather15°C (59°F)143 mm (5.6 inches)44%extreme
August Weather15°C (60°F)142 mm (5.6 inches)38%extreme
September Weather16°C (60°F)133 mm (5.3 inches)42%extreme
October Weather16°C (62°F)183 mm (7.2 inches)58%extreme
November Weather17°C (63°F)167 mm (6.6 inches)69%extreme
December Weather17°C (63°F)247 mm (9.7 inches)82%extreme

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