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September Weather in San Marcos, Nicaragua

Last updated: August 31, 2025

In September, the average temperature in San Marcos, Nicaragua hovers around 26°C (79°F). Expect a minimum of 21°C (71°F) and a maximum of 34°C (94°F), making for a warm climate. However, with an average humidity of 80% and 310 mm (12.2 in) of precipitation over 28 days, be prepared for some rainy spells during your visit!

September Temperature in San Marcos

In September in San Marcos, the average temperature is 26°C (79°F), with maximums reaching up to 34°C (94°F) and minimums dipping as low as 21°C (71°F). This pleasant climate makes it an ideal time for outdoor activities and exploring the sights.

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

The chart illustrates September temperature patterns in San Marcos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Marcos, September typically has an average temperature of 26°C (79°F), with highs reaching up to 34°C (94°F) and lows dropping to around 21°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec798081838180807979787979
Data source: Temperature data for San Marcos 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 Marcos

In San Marcos in September, the precipitation amount is 310 mm (12.2 in) spread over a period of 28 days.

September Precipitation Trends in San Marcos

The chart displays monthly precipitation patterns in San Marcos, 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 Marcos, September typically receives around 310 mm (12.2 inches) of precipitation spread over approximately 28 days.
JanFebMarAprMayJunJulAugSepOctNovDec5453531130914223331042714116
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Marcos

In San Marcos in September humidity is 80%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket, making outdoor activities feel sticky and exhausting, potentially dampening the travel experience and necessitating frequent breaks to cool down and hydrate.

September Average Humidity in San Marcos

This chart illustrates the average monthly humidity levels in San Marcos, 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 Marcos is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec66%64%63%63%63%74%85%82%80%79%79%70%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Marcos

In San Marcos in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in San Marcos.

Maximum UV Index Levels in San Marcos for September

The chart shows the monthly maximum UV Index (UVI) for San Marcos 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 Marcos typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec111314141414131313131010
Data source: San Marcos 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 Marcos Compares to Other Months

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

This table compares monthly weather conditions in San Marcos, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (79°F)5 mm (0.2 inches)66%extreme
February Weather26°C (80°F)4 mm (0.1 inches)64%extreme
March Weather27°C (81°F)5 mm (0.2 inches)63%extreme
April Weather28°C (83°F)35 mm (1.4 inches)63%extreme
May Weather27°C (81°F)311 mm (12.2 inches)63%extreme
June Weather26°C (80°F)309 mm (12.1 inches)74%extreme
July Weather27°C (80°F)142 mm (5.6 inches)85%extreme
August Weather26°C (80°F)233 mm (9.2 inches)82%extreme
September Weather26°C (79°F)310 mm (12.2 inches)80%extreme
October Weather26°C (78°F)427 mm (16.8 inches)79%extreme
November Weather26°C (79°F)141 mm (5.5 inches)79%very high
December Weather26°C (79°F)16 mm (0.6 inches)70%very high

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