Average May Weather in Delaware

Typical temperatures, precipitation, humidity and sunshine during May at cities and towns throughout Delaware are listed below.

Temperatures in Delaware for May

This table gives the averages in degrees Fahrenheit and Celsius for maximum and minimum monthly temperatures. These normal temperatures are based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

Average May temperatures

High °F	Low °F	Place	High °C	Low °C
74	54	Dover	24	12
75	55	Georgetown	24	13
73	52	Greenwood	23	11
75	56	Lewes	24	13
76	52	Newark	24	11
74	53	Wilmington	23	12

Precipitation in Delaware for May

Here are the May averages for rainfall in Delaware. Each place has a total for how many days of wet weather it usually gets this month and for the normal amount of precipitation, based on the weather during 1991 to 2020. The calculation of days only includes those when precipitation totalled 0.01 inches (0.25 millimetres) or more.

Average precipitation in May

Days	Place	Inches	Milli­metres
11	Dover	3.9	99
12	Georgetown	3.6	92
10	Greenwood	3.7	93
11	Lewes	3.4	86
11	Newark	3.6	92
12	Wilmington	3.6	91

Sunshine in Delaware for May

In the table below, the average number of Sunny Days in Delaware is the total days this month when the sky is mostly clear. This includes the days when cloud covers up to 30% of the sky during daylight hours.

Partly Sunny Days have cloud covering from 40% to 70% of the sky during the daytime. The rest of the days during May are mainly overcast, with at least 80% cloud cover. Total Days With Sun is a sum of the Sunny plus Partly Sunny days. These numbers are averages of most the years the weather station has operated.

Days of sunshine in May

City	Sunny	Partly Sunny	Total Days With Sun
Wilmington	7	10	17

Humidity in Delaware

In the table below, the Daily number is the average of relative humidity readings taken every three hours throughout the day. Morning percentages are for 7 am and Afternoon levels are for 4 pm local standard time. All the humidity numbers are averages for the years 1961 to 1990.

Average May humidity (%)

Daily	City	Morning	Afternoon
67	Wilmington	75	52