September Weather in Alexandria, United States

Last updated: June 24, 2025

In Alexandria, United States, the average temperature in September hovers around 19°C (66°F). Expect a temperature range that can dip to a chilly 3°C (37°F) and soar up to a warm 34°C (93°F). This month also brings 90 mm (3.6 in) of precipitation over 8 days, with an average humidity of 75%. Be prepared for varying weather conditions!

September Temperature in Alexandria

In September in Alexandria, the average temperature is 19°C (66°F). Maximums can reach 34°C (93°F), while minimums can drop to as low as 3°C (37°F). Be prepared for a mix of warm days and cooler nights when traveling to Alexandria during this month.

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

The chart illustrates September temperature patterns in Alexandria, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alexandria, September typically has an average temperature of 19°C (66°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (37°F).

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

September Precipitation in Alexandria

In Alexandria in September, the total precipitation amount is 90 mm (3.6 in) spread over the course of 8 days.

September Precipitation Trends in Alexandria

The chart displays monthly precipitation patterns in Alexandria, 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 Alexandria, September typically receives around 90 mm (3.6 inches) of precipitation spread over approximately 8 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Alexandria

In Alexandria in September humidity is 75%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it slightly uncomfortable for traveling as you navigate through the thick, muggy air.

September Average Humidity in Alexandria

This chart illustrates the average monthly humidity levels in Alexandria, 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 Alexandria is approximately 75%, 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 Alexandria

In Alexandria in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Alexandria.

Maximum UV Index Levels in Alexandria for September

The chart shows the monthly maximum UV Index (UVI) for Alexandria 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 Alexandria typically reaches 8, which falls under the very high exposure category.

Data source: Alexandria 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 Alexandria Compares to Other Months

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

This table compares monthly weather conditions in Alexandria, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	18 mm (0.7 inches)	77%	low
February Weather	-7°C (20°F)	20 mm (0.8 inches)	81%	moderate
March Weather	2°C (35°F)	61 mm (2.4 inches)	71%	moderate
April Weather	7°C (45°F)	75 mm (3.0 inches)	75%	very high
May Weather	15°C (59°F)	100 mm (3.9 inches)	74%	very high
June Weather	23°C (73°F)	74 mm (2.9 inches)	82%	extreme
July Weather	24°C (76°F)	86 mm (3.4 inches)	84%	very high
August Weather	22°C (72°F)	89 mm (3.5 inches)	82%	very high
September Weather	19°C (66°F)	90 mm (3.6 inches)	75%	very high
October Weather	9°C (48°F)	76 mm (3.0 inches)	72%	moderate
November Weather	2°C (35°F)	21 mm (0.8 inches)	81%	moderate
December Weather	-3°C (26°F)	34 mm (1.4 inches)	79%	low