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May Weather in Dover, United States

Last updated: June 24, 2025

In May, the average temperature in Dover, United States hovers around 20°C (68°F), with daily fluctuations that can bring a minimum of 5°C (41°F) and a summer-like maximum of 33°C (92°F). Be prepared for wet weather, as the region experiences an average precipitation of 209 mm (8.2 in) over approximately 15 days, accompanied by an average humidity level of 82%. Embrace the variety while enjoying the climate!

May Temperature in Dover

In May in Dover, the average temperature is 20°C (68°F), with maximums reaching 33°C (92°F) and minimums dropping as low as 5°C (41°F). This climate makes Dover an ideal destination for travelers seeking a pleasant mix of warm days and cool nights.

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

The chart illustrates May 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, May typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 5°C (41°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.

May Precipitation in Dover

In Dover in May, the total precipitation amount is 209 mm (8.2 in) over the course of 15 days.

May Precipitation Trends in Dover

The chart displays monthly precipitation patterns in Dover, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Dover, May typically receives around 209 mm (8.2 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec99144155147209116801117210597113
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Dover

In Dover in May humidity is 82%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit sluggish but surprisingly refreshing, as long as you take breaks in shaded areas to cool off.

May Average Humidity in Dover

This chart illustrates the average monthly humidity levels in Dover, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Dover is approximately 82%, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Dover

In Dover in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Dover.

Maximum UV Index Levels in Dover for May

The chart shows the monthly maximum UV Index (UVI) for Dover in May, 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 May, the maximum UV index in Dover typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109754
Data source: Dover May 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 May 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 May’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 May’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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