Delaware, United States — Weather in May 2027

Climate Overview

Delaware, United States in May has warm conditions, with highs averaging 21.7°C (71°F). Rain falls on about 15 days this month, totalling around 121 mm.

This month falls at the end of Spring.

Daily highs in May gradually rise from around 19°C (67°F) at the start to 24°C (75°F) by month's end.

May sees fairly even rainfall, totalling about 121 mm across the month.

Expect around 7.5h of sunshine at the start of May, increasing to 10.6h by the end.

Wind speeds ease off through the month, from 22 km/h (13 mph) to 18 km/h (11 mph).

The warmest days tend to fall around the 26th, averaging 24.6°C (76°F).

Compared to April, this month is about 5°C warmer with 2 more rainy days. Temperatures will rise further into June.

Monthly May Averages

Temperature

22°C / 12°C

Feels Like

22°C / 11°C

Rain

15 days · 121 mm

Sunshine

9.7h / day

Humidity

73% — Humid

Wind

19 km/h

Wind Direction

SW (226°)

Gusts

39 km/h

Daylight

14.4 h

Cloud Cover

66%

Clear Sky Days

2.9

UV Index

6.4 — High

Dew Point

12°C — Comfortable

Moon Phase

Waxing Gibbous · 66%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

HighLow

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 06:18

Daylight 14.4h

Sunset 20:42

What to Expect

Daytime temperatures around 22°C (71°F) are ideal for full-day outdoor exploration. Keep afternoons flexible as tropical showers are common — they typically clear within an hour.

Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.

2 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	3°C / -5°C	-2°C / -10°C	10days (84 mm) Wet	4.9h Fair	73% Muggy	2.3 Moderate	Poor	View Details
February	6°C / -3°C	2°C / -8°C	11days (95 mm) Wet	6.3h Fair	71% Muggy	3.4 Moderate	Poor	View Details
March	12°C / 1°C	8°C / -3°C	13days (106 mm) Wet	7.6h Good	66% Muggy	4.7 Moderate	Poor	View Details
April	17°C / 6°C	14°C / 2°C	13days (111 mm) Wet	9h Good	67% Muggy	5.7 High	Fair	View Details
May best	22°C / 12°C	22°C / 11°C	15days (121 mm) Wet	9.7h Good	73% Muggy	6.4 High	Good	View Details
June best	26°C / 17°C	28°C / 17°C	13days (119 mm) Wet	11.5h Excellent	71% Muggy	6.9 High	Excellent	View Details
July best	28°C / 19°C	31°C / 21°C	13days (110 mm) Wet	11.5h Excellent	74% Muggy	7.1 Very High	Good	View Details
August best	27°C / 18°C	30°C / 20°C	11days (73 mm) Wet	11.1h Excellent	74% Muggy	6.6 High	Excellent	View Details
September best	25°C / 16°C	26°C / 16°C	8days (74 mm) Wet	9.5h Good	70% Muggy	5.5 High	Excellent	View Details
October	19°C / 10°C	17°C / 7°C	9days (78 mm) Wet	7.8h Good	69% Muggy	4 Moderate	Good	View Details
November	11°C / 2°C	7°C / -2°C	9days (76 mm) Wet	6h Fair	70% Muggy	2.6 Moderate	Poor	View Details
December	6°C / -2°C	2°C / -7°C	11days (87 mm) Wet	4.8h Fair	75% Muggy	2.1 Moderate	Poor	View Details

What to Wear

Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

UmbrellaWaterproof jacketWaterproof shoesSunscreen (SPF 30+)Sunglasses

Frequently Asked Questions

Expand all

Is May a good time to visit Delaware?

May is typically good for visiting Delaware, with average highs of 22°C (71°F) and around 15 rainy days. Delaware, United States in May has warm conditions, with highs averaging 21.7°C (71°F). Rain falls on about 15 days this

Does it rain a lot in Delaware in May?

Delaware typically sees around 15 rainy days in May with 121 mm (4.8 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Delaware in May?

Nights in Delaware during May are cool at around 12°C (54°F). Bring a jacket or sweater for evenings.

What should I pack for Delaware in May?

With highs of 22°C (71°F) and lows of 12°C (54°F) in May, we recommend: Umbrella, Waterproof jacket, Waterproof shoes, Sunscreen (SPF 30+), Sunglasses. Comfortable walking shoes are essential.

Is May among the best months weather-wise in Delaware?

Yes, May offers some of the best weather conditions in Delaware with comfortable temperatures and lower chances of rain.

What is the UV index in Delaware in May?

The average UV index in Delaware during May is 6 (high). Wear sunscreen SPF 30+, a hat, and sunglasses. Limit direct sun exposure between 10 AM and 4 PM.

How many hours of daylight are there in Delaware in May?

Delaware gets approximately 14 hours of daylight per day in May, with around 10 hours of sunshine.

Does it snow in Delaware in May?

Snow is uncommon in Delaware during May based on 10-year climate averages.

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