September Weather in Ellicott, United States

Last updated: June 24, 2025

In September, the average temperature in Ellicott, United States is a pleasant 19°C (66°F). However, temperatures can vary significantly, with a minimum of -1°C (31°F) and a sweltering maximum of 36°C (96°F). Expect an average humidity of 79% and 22 mm (0.9 in) of precipitation over about 4 days.

September Temperature in Ellicott

In September in Ellicott, the average temperature is 19°C (66°F). The maximum can reach 36°C (96°F), and the minimum can be as low as -1°C (31°F). It's important to pack for a range of temperatures if you're planning a trip during this month.

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

The chart illustrates September temperature patterns in Ellicott, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ellicott, September typically has an average temperature of 19°C (66°F), with highs reaching up to 36°C (96°F) and lows dropping to around -1°C (31°F).

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

September Precipitation in Ellicott

In Ellicott in September, the precipitation amount is 22 mm (0.9 in) over a duration of 4 days.

September Precipitation Trends in Ellicott

The chart displays monthly precipitation patterns in Ellicott, 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 Ellicott, September typically receives around 22 mm (0.9 inches) of precipitation spread over approximately 4 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 Ellicott

In Ellicott in September humidity is 79%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, making it feel much warmer than the actual temperature and creating a heavy, sticky atmosphere that can be a bit uncomfortable for traveling.

September Average Humidity in Ellicott

This chart illustrates the average monthly humidity levels in Ellicott, 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 Ellicott is approximately 79%, 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 Ellicott

In Ellicott in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Ellicott.

Maximum UV Index Levels in Ellicott for September

The chart shows the monthly maximum UV Index (UVI) for Ellicott 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 Ellicott typically reaches 10, which falls under the very high exposure category.

Data source: Ellicott 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 Ellicott Compares to Other Months

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

This table compares monthly weather conditions in Ellicott, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (31°F)	12 mm (0.5 inches)	74%	moderate
February Weather	-1°C (30°F)	16 mm (0.6 inches)	75%	high
March Weather	5°C (41°F)	42 mm (1.6 inches)	66%	very high
April Weather	9°C (48°F)	33 mm (1.3 inches)	62%	extreme
May Weather	14°C (57°F)	59 mm (2.3 inches)	74%	extreme
June Weather	21°C (70°F)	30 mm (1.2 inches)	76%	extreme
July Weather	23°C (74°F)	63 mm (2.5 inches)	75%	extreme
August Weather	22°C (72°F)	39 mm (1.5 inches)	80%	extreme
September Weather	19°C (66°F)	22 mm (0.9 inches)	79%	very high
October Weather	10°C (49°F)	28 mm (1.1 inches)	77%	high
November Weather	4°C (40°F)	13 mm (0.5 inches)	74%	moderate
December Weather	1°C (33°F)	8 mm (0.3 inches)	80%	moderate