September Weather in Harper, Liberia

Last updated: August 23, 2025

In September, the average temperature in Harper, Liberia hovers around 25°C (78°F), with minimum temperatures dropping to 23°C (74°F) and maximums rising to 30°C (86°F). Expect a precipitation amount of 358 mm (14.1 in) over 29 days, accompanied by a high average humidity of 94%, creating a distinctively tropical atmosphere.

September Temperature in Harper

In September in Harper, the average temperature is 25°C (78°F), with maximums reaching up to 30°C (86°F) and minimums dipping as low as 23°C (74°F). This pleasant climate makes it an ideal time for travelers to explore all that Harper has to offer.

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

The chart illustrates September temperature patterns in Harper, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harper, September typically has an average temperature of 25°C (78°F), with highs reaching up to 30°C (86°F) and lows dropping to around 23°C (74°F).

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

September Precipitation in Harper

In Harper in September, the total precipitation amount is 358 mm (14.1 in) accumulated over 29 days.

September Precipitation Trends in Harper

The chart displays monthly precipitation patterns in Harper, 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 Harper, September typically receives around 358 mm (14.1 inches) of precipitation spread over approximately 29 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 Harper

In Harper in September humidity is 94%. With an average temperature of 25°C (78°F), this humidity feels like stepping into a warm, damp embrace, making travel challenging as the air weighs heavily, inviting sweat to bead on your skin and leaving you feeling sticky and lethargic.

September Average Humidity in Harper

This chart illustrates the average monthly humidity levels in Harper, 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 Harper is approximately 94%, 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 Harper

In Harper in September, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Harper.

Maximum UV Index Levels in Harper for September

The chart shows the monthly maximum UV Index (UVI) for Harper 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 Harper typically reaches 12, which falls under the extreme exposure category.

Data source: Harper 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 Harper Compares to Other Months

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

This table compares monthly weather conditions in Harper, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (80°F)	92 mm (3.6 inches)	74%	extreme
February Weather	27°C (81°F)	111 mm (4.4 inches)	77%	extreme
March Weather	27°C (80°F)	162 mm (6.4 inches)	79%	extreme
April Weather	27°C (81°F)	170 mm (6.7 inches)	81%	extreme
May Weather	27°C (80°F)	300 mm (11.8 inches)	84%	extreme
June Weather	26°C (79°F)	447 mm (17.6 inches)	88%	extreme
July Weather	25°C (78°F)	189 mm (7.4 inches)	89%	extreme
August Weather	25°C (77°F)	140 mm (5.5 inches)	93%	extreme
September Weather	25°C (78°F)	358 mm (14.1 inches)	94%	extreme
October Weather	26°C (79°F)	260 mm (10.2 inches)	92%	extreme
November Weather	26°C (79°F)	173 mm (6.8 inches)	82%	extreme
December Weather	26°C (80°F)	126 mm (5.0 inches)	79%	extreme