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September Weather in San Isidro, Nicaragua

Last updated: August 31, 2025

In San Isidro, Nicaragua, the average temperature for September hovers around 24°C (75°F), with a minimum of 18°C (65°F) and a maximum reaching 33°C (92°F). Expect precipitation of 208 mm (8.2 in) over approximately 23 days, contributing to the average humidity level of 69%.

September Temperature in San Isidro

In September in San Isidro, the average temperature is 24°C (75°F), with maximums reaching 33°C (92°F) and minimums dropping to as low as 18°C (65°F). This pleasant climate makes it an ideal destination for travelers looking to enjoy mild weather and outdoor activities.

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

The chart illustrates September temperature patterns in San Isidro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Isidro, September typically has an average temperature of 24°C (75°F), with highs reaching up to 33°C (92°F) and lows dropping to around 18°C (65°F).
JanFebMarAprMayJunJulAugSepOctNovDec727475787775757575747372
Data source: Temperature data for San Isidro 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 Isidro

In San Isidro in September, the precipitation amount is 208 mm (8.2 in) over a span of 23 days.

September Precipitation Trends in San Isidro

The chart displays monthly precipitation patterns in San Isidro, 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 Isidro, September typically receives around 208 mm (8.2 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec758362971826814120830510013
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Isidro

In San Isidro in September, humidity is 69%. With an average temperature of 24°C (75°F), this humidity feels like a warm embrace, making it both refreshing and somewhat muggy for traveling.

September Average Humidity in San Isidro

This chart illustrates the average monthly humidity levels in San Isidro, 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 Isidro is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec56%54%51%50%50%55%65%64%69%68%61%56%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Isidro

In San Isidro 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 Isidro.

Maximum UV Index Levels in San Isidro for September

The chart shows the monthly maximum UV Index (UVI) for San Isidro 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 Isidro typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec111315151414141413141110
Data source: San Isidro 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 Isidro Compares to Other Months

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

This table compares monthly weather conditions in San Isidro, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather22°C (73°F)7 mm (0.3 inches)56%extreme
February Weather23°C (74°F)5 mm (0.2 inches)54%extreme
March Weather24°C (75°F)8 mm (0.3 inches)51%extreme
April Weather26°C (78°F)36 mm (1.4 inches)50%extreme
May Weather25°C (77°F)297 mm (11.7 inches)50%extreme
June Weather24°C (76°F)182 mm (7.2 inches)55%extreme
July Weather24°C (76°F)68 mm (2.7 inches)65%extreme
August Weather24°C (76°F)141 mm (5.6 inches)64%extreme
September Weather24°C (75°F)208 mm (8.2 inches)69%extreme
October Weather23°C (74°F)305 mm (12.0 inches)68%extreme
November Weather23°C (74°F)100 mm (3.9 inches)61%extreme
December Weather22°C (73°F)13 mm (0.5 inches)56%very high

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