September Weather in Lebanon, United States

Last updated: June 24, 2025

In September, the average temperature in Lebanon, United States hovers around a pleasant 20°C (68°F). However, be prepared for temperature swings, as it can dip to a chilly 4°C (39°F) or soar up to a sizzling 32°C (89°F). With an average precipitation of 102 mm (4.0 in) spread over 11 days, and humidity levels at a comfortable 68%, this month offers a refreshing blend of warmth and moisture.

September Temperature in Lebanon

In September in Lebanon, the average temperature is 20°C (68°F). Maximums can reach 32°C (89°F) and minimums can be as low as 4°C (39°F). This makes Lebanon an ideal destination for travelers looking to enjoy mild weather and a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Lebanon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lebanon, September typically has an average temperature of 20°C (68°F), with highs reaching up to 32°C (89°F) and lows dropping to around 4°C (39°F).

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

September Precipitation in Lebanon

In Lebanon in September, the precipitation amount is 102 mm (4.0 in) over the course of 11 days.

September Precipitation Trends in Lebanon

The chart displays monthly precipitation patterns in Lebanon, 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 Lebanon, September typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 11 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 Lebanon

In Lebanon in September humidity is 68%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls while also prompting travelers to stay hydrated and seek out refreshing breaks from the heat.

September Average Humidity in Lebanon

This chart illustrates the average monthly humidity levels in Lebanon, 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 Lebanon is approximately 68%, 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 Lebanon

In Lebanon in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Lebanon.

Maximum UV Index Levels in Lebanon for September

The chart shows the monthly maximum UV Index (UVI) for Lebanon 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 Lebanon typically reaches 9, which falls under the very high exposure category.

Data source: Lebanon 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 Lebanon Compares to Other Months

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

This table compares monthly weather conditions in Lebanon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	92 mm (3.6 inches)	87%	moderate
February Weather	5°C (42°F)	161 mm (6.3 inches)	87%	high
March Weather	8°C (47°F)	126 mm (5.0 inches)	86%	very high
April Weather	12°C (54°F)	143 mm (5.6 inches)	84%	very high
May Weather	17°C (64°F)	122 mm (4.8 inches)	83%	extreme
June Weather	21°C (69°F)	135 mm (5.3 inches)	83%	extreme
July Weather	23°C (73°F)	92 mm (3.6 inches)	79%	extreme
August Weather	22°C (71°F)	95 mm (3.7 inches)	66%	very high
September Weather	20°C (68°F)	102 mm (4.0 inches)	68%	very high
October Weather	14°C (58°F)	119 mm (4.7 inches)	78%	high
November Weather	7°C (44°F)	75 mm (3.0 inches)	89%	moderate
December Weather	4°C (40°F)	120 mm (4.7 inches)	86%	moderate