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September Weather in Dover, United States

Last updated: June 24, 2025

In Dover, United States, the average temperature in September is a pleasant 23°C (74°F), making it an ideal time to explore. However, be prepared for temperature fluctuations, with minimums dropping to 8°C (46°F) and maximums soaring up to 35°C (96°F). Expect some rain, as precipitation averages around 72 mm (2.8 in) over 7 days, and don't forget to stay comfortable, as the average humidity sits at 59%.

September Temperature in Dover

In September, in Dover, the average temperature is 23°C (74°F). Maximums can reach 35°C (96°F) while minimums can drop to as low as 8°C (46°F). This weather makes Dover an ideal destination for travelers, offering a pleasant climate for outdoor activities and exploration.

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 23°C (74°F), with highs reaching up to 35°C (96°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec394252586876807874624945
Data source: Temperature data for Dover generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Dover

In Dover in September, the total precipitation amount is 72 mm (2.8 in) over the course of 7 days.

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 72 mm (2.8 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec99144155147209116801117210597113
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Dover

In Dover in September humidity is 59%. With an average temperature of 23°C (74°F), this humidity feels like a warm, inviting embrace, making it comfortable for traveling as long as you stay hydrated and take breaks in the shade.

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 59%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%77%78%82%81%75%61%59%69%82%88%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109754
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.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)99 mm (3.9 inches)82%moderate
February Weather6°C (43°F)144 mm (5.7 inches)79%high
March Weather11°C (53°F)155 mm (6.1 inches)77%very high
April Weather14°C (58°F)147 mm (5.8 inches)78%very high
May Weather20°C (68°F)209 mm (8.2 inches)82%extreme
June Weather24°C (76°F)116 mm (4.6 inches)81%extreme
July Weather27°C (80°F)80 mm (3.2 inches)75%extreme
August Weather25°C (78°F)110 mm (4.3 inches)61%very high
September Weather23°C (74°F)72 mm (2.8 inches)59%very high
October Weather16°C (62°F)105 mm (4.1 inches)69%high
November Weather9°C (49°F)97 mm (3.8 inches)82%moderate
December Weather7°C (45°F)113 mm (4.5 inches)87%moderate

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