September Weather in Dover, United States

Last updated: June 24, 2025

In September, the average temperature in Dover, United States is a comfortable 22°C (72°F), with daytime highs reaching up to 33°C (92°F) and occasional lows of 9°C (49°F). You can expect 96 mm (3.8 in) of precipitation spread over 11 days, contributing to an average humidity of 75%. Enjoy the diverse climate of this beautiful location!

September Temperature in Dover

In September in Dover, the average temperature is 22°C (72°F). The maximum can reach 33°C (92°F), while the minimum can drop to as low as 9°C (49°F). This makes Dover a perfect destination for travelers seeking mild weather with the option for warmer or cooler days.

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

The chart illustrates September temperature patterns in Dover, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dover, September typically has an average temperature of 22°C (72°F), with highs reaching up to 33°C (92°F) and lows dropping to around 9°C (49°F).

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

September Precipitation in Dover

In Dover in September, the precipitation amount is 96 mm (3.8 in) spread over 11 days, resulting in a significant accumulation of rainfall.

September Precipitation Trends in Dover

The chart displays monthly precipitation patterns in Dover, 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 Dover, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 11 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 Dover

In Dover in September, humidity is 75%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet requiring travelers to stay hydrated and take breaks in shaded areas.

September Average Humidity in Dover

This chart illustrates the average monthly humidity levels in Dover, 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 Dover 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 Dover

In Dover 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 Dover.

Maximum UV Index Levels in Dover for September

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

Data source: Dover 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 Dover Compares to Other Months

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

This table compares monthly weather conditions in Dover, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (38°F)	59 mm (2.3 inches)	84%	moderate
February Weather	5°C (41°F)	99 mm (3.9 inches)	83%	moderate
March Weather	8°C (46°F)	105 mm (4.1 inches)	83%	high
April Weather	13°C (56°F)	96 mm (3.8 inches)	81%	very high
May Weather	18°C (65°F)	127 mm (5.0 inches)	78%	very high
June Weather	24°C (75°F)	106 mm (4.2 inches)	79%	very high
July Weather	27°C (80°F)	144 mm (5.7 inches)	74%	very high
August Weather	25°C (78°F)	183 mm (7.2 inches)	72%	very high
September Weather	22°C (72°F)	96 mm (3.8 inches)	75%	very high
October Weather	17°C (63°F)	121 mm (4.8 inches)	81%	high
November Weather	9°C (49°F)	78 mm (3.1 inches)	85%	moderate
December Weather	5°C (42°F)	97 mm (3.8 inches)	84%	moderate