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September Weather in San Fernando, Nicaragua

Last updated: August 31, 2025

In September, the average temperature in San Fernando, Nicaragua is a pleasant 24°C (76°F). Expect a minimum of 17°C (64°F) and a maximum of 35°C (95°F) throughout the month. With precipitation amounting to 158 mm (6.2 in) over 23 days, a bit of rain can be anticipated. The average humidity rests at a comfortable 69%, making for an inviting atmosphere.

September Temperature in San Fernando

In September in San Fernando, the average temperature is 24°C (76°F), with maximums reaching up to 35°C (95°F) and minimums dipping as low as 17°C (64°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy the outdoor attractions.

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

The chart illustrates September temperature patterns in San Fernando, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Fernando, September typically has an average temperature of 24°C (76°F), with highs reaching up to 35°C (95°F) and lows dropping to around 17°C (64°F).
JanFebMarAprMayJunJulAugSepOctNovDec717274777775747575747271
Data source: Temperature data for San Fernando 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 Fernando

In San Fernando in September, the precipitation amount is 158 mm (6.2 in) over a span of 23 days.

September Precipitation Trends in San Fernando

The chart displays monthly precipitation patterns in San Fernando, 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 Fernando, September typically receives around 158 mm (6.2 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec24242335212164991131582399435
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Fernando

In San Fernando in September humidity is 69%. With an average temperature of 24°C (76°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel a bit more exhausting, so travelers should stay hydrated and take frequent breaks in the shade.

September Average Humidity in San Fernando

This chart illustrates the average monthly humidity levels in San Fernando, 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 Fernando 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 Fernando

In San Fernando 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 Fernando.

Maximum UV Index Levels in San Fernando for September

The chart shows the monthly maximum UV Index (UVI) for San Fernando 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 Fernando typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec111315151414141413131110
Data source: San Fernando 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 Fernando Compares to Other Months

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

This table compares monthly weather conditions in San Fernando, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather21°C (71°F)24 mm (0.9 inches)56%extreme
February Weather22°C (73°F)23 mm (0.9 inches)54%extreme
March Weather23°C (74°F)23 mm (0.9 inches)51%extreme
April Weather25°C (78°F)35 mm (1.4 inches)50%extreme
May Weather25°C (78°F)212 mm (8.3 inches)50%extreme
June Weather24°C (75°F)164 mm (6.5 inches)55%extreme
July Weather24°C (75°F)99 mm (3.9 inches)65%extreme
August Weather24°C (75°F)113 mm (4.4 inches)64%extreme
September Weather24°C (76°F)158 mm (6.2 inches)69%extreme
October Weather23°C (74°F)239 mm (9.4 inches)68%extreme
November Weather22°C (73°F)94 mm (3.7 inches)61%extreme
December Weather21°C (71°F)35 mm (1.4 inches)56%very high

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