September Weather in Siuna, Nicaragua

Last updated: August 31, 2025

In September, the average temperature in Siuna, Nicaragua is a warm 26°C (79°F). Temperatures can dip to a comfortable 21°C (69°F) and occasionally soar to a sizzling 33°C (92°F). The month sees about 183 mm (7.2 in) of rain spread over 27 days, contributing to a high average humidity of 72%.

September Temperature in Siuna

In September in Siuna, the average temperature is 26°C (79°F). Maximums can reach 33°C (92°F) while minimums can drop as low as 21°C (69°F). This pleasant climate makes it an ideal destination for travelers looking to enjoy outdoor activities and explore the sights.

September Weather in Siuna: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Siuna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Siuna, September typically has an average temperature of 26°C (79°F), with highs reaching up to 33°C (92°F) and lows dropping to around 21°C (69°F).

Data source: Temperature data for Siuna generated using information from the Copernicus Climate Change Service.

September Precipitation in Siuna

In Siuna in September, the total precipitation amount is 183 mm (7.2 in) spread over 27 days.

September Precipitation Trends in Siuna

The chart displays monthly precipitation patterns in Siuna, 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 Siuna, September typically receives around 183 mm (7.2 inches) of precipitation spread over approximately 27 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Siuna

In Siuna in September, humidity is 72%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel a bit more strenuous but also adding a tropical charm to your travels.

September Average Humidity in Siuna

This chart illustrates the average monthly humidity levels in Siuna, 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 Siuna is approximately 72%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Siuna

In Siuna 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 Siuna.

Maximum UV Index Levels in Siuna for September

The chart shows the monthly maximum UV Index (UVI) for Siuna 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 Siuna typically reaches 13, which falls under the extreme exposure category.

Data source: Siuna 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 Siuna Compares to Other Months

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

This table compares monthly weather conditions in Siuna, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	24°C (75°F)	49 mm (1.9 inches)	68%	very high
February Weather	24°C (76°F)	50 mm (2.0 inches)	68%	extreme
March Weather	25°C (77°F)	61 mm (2.4 inches)	67%	extreme
April Weather	26°C (80°F)	57 mm (2.2 inches)	67%	extreme
May Weather	26°C (80°F)	259 mm (10.2 inches)	68%	extreme
June Weather	26°C (79°F)	240 mm (9.4 inches)	73%	extreme
July Weather	26°C (78°F)	189 mm (7.4 inches)	76%	extreme
August Weather	25°C (78°F)	187 mm (7.3 inches)	73%	extreme
September Weather	26°C (79°F)	183 mm (7.2 inches)	72%	extreme
October Weather	25°C (78°F)	244 mm (9.6 inches)	71%	extreme
November Weather	25°C (77°F)	177 mm (7.0 inches)	71%	very high
December Weather	24°C (75°F)	67 mm (2.7 inches)	69%	very high