Climate and monthly weather forecast
Dewey Beach, DE

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The climate of Dewey Beach

Situated on the Atlantic coast in the state of Delaware, Dewey Beach features a humid subtropical climate, denoted as Cfa according to the Köppen-Geiger climate classification. It is characterized by plentiful rainfall throughout the year and no specific dry season.

Over twelve months, Dewey Beach experiences significant temperature variations. Average high temperatures ascend from 41.4°F (5.2°C) in January to a peak of 80.2°F (26.8°C) in July, before descending to 47.3°F (8.5°C) in December. On the other hand, the average low temperatures reveal a similar pattern, with January starting at 33.1°F (0.6°C), peaking at 73.6°F (23.1°C) in July, and finally receding to 39.4°F (4.1°C) in December.

Humidity hovers high in the range from 73% to 82% throughout the year, contributing to the general warmth. Rainfall varies between 0.28" (7mm) and 0.71" (18mm) per month, with the heaviest downpours seen in October. The city witnesses minimal snowfall, usually restricted to the months of January and December.

On average, Dewey Beach enjoys 5.5 hours of sunshine in January and up to 11.1 hours in July. The UV index stays moderate from 2 to 6, indicating need for protection against skin damage during the hotter months. The wind speed varies from 8.9mph (14.3km/h) to 13mph (20.9km/h), while gusts can reach speeds of up to 21.6mph (34.8km/h).

The best time to visit Dewey Beach

For those seeking the mildest and most enjoyable weather, May to September is deemed the best time to visit Dewey Beach. Average high temperatures during this period stay between 56.5°F (13.6°C) and 79.2°F (26.2°C). The days are long and packed with sunshine, with average daylight spanning from 14.3 to 14.8 hours. Humidity is at a manageable 80%, and while there is moderate rainfall, these months also provide the longest hours of daylight and sunshine, an opportune time for participating in outdoor activities and visiting attractions.

The worst time to visit Dewey Beach

January and February are considered the least favorable months to visit Dewey Beach because of the unfavorable weather conditions. During these months, average high temperatures fall to a chilly 41.4°F (5.2°C) to 42.6°F (5.9°C), while the average lows dip even further to around 33.1°F (0.6°C) to 34.3°F (1.3°C). While the snowfall is rather insignificant compared to other parts of the country, it adds to the overall wintry feel.

Spring weather in Dewey Beach

Spring in Dewey Beach is mild and enjoyable. From March to May, average high temperatures increase steadily from 47.3°F (8.5°C) to 65.5°F (18.6°C). Rainfall starts to increase, with April receiving 0.43" (11mm) and May witnessing 0.55" (14mm) of average monthly rainfall. Daylight gradually increases, from 12 hours in March to 14.3 hours in May, enhancing the warmth and charm of spring.

Summer weather in Dewey Beach

Summers are the liveliest time in Dewey Beach. From June to August, the temperatures peak with monthly highs averaging between 74.5°F (23.6°C) and 80.2°F (26.8°C). The weather supports water activities with increased hours of sunshine up to 11.1 hours. Though these months experience the highest rainfall figures - up to 0.63" (16mm), it barely affects outdoor activities due to comparatively longer days and ample sunshine.

Autumn weather in Dewey Beach

Autumn sees mild weather but with a substantial reduction in temperature. From September to November, average high temperatures drop from 74.1°F (23.4°C) to 54.5°F (12.5°C). October receives maximum rainfall of 0.71" (18mm) amongst autumn months. However, dewy mornings and luminous days still attract nature enthusiasts.

Winter weather in Dewey Beach

Winters in Dewey Beach, although mild by northern standards, are the coldest time of the year. December through February witnesses a drop in average high temperatures from 47.3°F (8.5°C) to 41.4°F (5.2°C), with lows dropping between 39.4°F (4.1°C) and 33.1°F (0.6°C). Nights become lengthy and chilly, and minimal snowfall may occur, transforming the Beach into a scenic winter landscape.

Weather in January

January in Dewey Beach, Delaware, sees the year off to a frosty start. A mixture of rain, snow, and cold temperatures characterizes the weather this month. The high temperature has an average of 41.4°F (5.2°C), whilst the low temperature dips to an average of 33.1°F (0.6°C). Weather in January »

Weather in February

The weather in February in Dewey Beach, Delaware, remains chilly, albeit slightly warmer than January. Overcast skies and drizzle are frequent, lending the city an ethereal beauty. With highs of 42.6°F (5.9°C) and lows of 34.3°F (1.3°C), the mercury level is marginally higher compared to January. Weather in February »

Weather in March

March ushers in spring, as temperatures start to steadily rise in Dewey Beach, Delaware. This change is noticeable as the average high and low temperatures stand at 47.3°F (8.5°C) and 39.7°F (4.3°C) respectively. Along with the warmer temperatures, rainfall also witnesses an increase, amounting to 0.51" (13mm) usually distributed among 7.6 days. Weather in March »

Weather in April

The heart of spring, April's weather in Dewey Beach, Delaware, is characterized by longer sunny days and warming temperatures. Outdoor enthusiasts can start packing their picnic baskets and hiking gear. This month registers a significant rise in temperature, with the high averaging at 56.5°F (13.6°C) and the low at 48.7°F (9.3°C). Weather in April »

Weather in May

May is when Dewey Beach, Delaware, truly starts to show signs of approaching summer. The landscape transitions into shades of green and the air is filled with the scent of blossoming flowers. The high temperature marks a palpable increase to an average of 65.5°F (18.6°C), while the low registers at 58.5°F (14.7°C). Weather in May »

Weather in June

The month of June in Dewey Beach, Delaware, is indicative of the full swing of summer. The city is filled with cheerful outdoor events and beach activities. The average high temperature increases to a warm and pleasant 74.5°F (23.6°C) and the low hovers around 67.6°F (19.8°C). Weather in June »

Weather in July

July is the peak of the summer season in Dewey Beach, Delaware, with temperatures soaring to new heights. Vacationers throng the city's beaches and parks to soak up the sun. Expected high and low temperatures are 80.2°F (26.8°C) and 73.6°F (23.1°C) respectively, making July the hottest month of the year. Weather in July »

Weather in August

August in Dewey Beach, Delaware, entails the continuation of summer's warmth but with a hint of an approaching fall. Frequent visits to the beach or swimming pool become a daily routine for many. The high temperature records a slight dip to 79.2°F (26.2°C) while the low remains more or less unchanged at 73°F (22.8°C). Weather in August »

Weather in September

September brings the onset of autumn in Dewey Beach, Delaware. There is a significant decrease in temperature as summer recedes. This month experiences weather moderation with the high temperature averaging around 74.1°F (23.4°C) and the low around 67.8°F (19.9°C). Weather in September »

Weather in October

October is the heart of the autumn season in Dewey Beach, Delaware. It is marked by vibrant fall colors and comfortably cool temperatures. The average high temperature of 65.3°F (18.5°C) and the low of 58.1°F (14.5°C) makes October weather just right for hiking and bird watching. Weather in October »

Weather in November

November, in Dewey Beach, Delaware, indicates a gradual shift to winter. Local cafes start serving hot beverages and hearty meals to stave off the chill. The high temperature drops considerably to an average of 54.5°F (12.5°C) while the low descends to 46.8°F (8.2°C). Weather in November »

Weather in December

December is the advent of winter in Dewey Beach, Delaware. The city exudes a festive vibe with streets adorned with holiday lights and decorations, despite the cold weather. December experiences lower average temperatures, with the high temperature dropping to 47.3°F (8.5°C) and the low to 39.4°F (4.1°C). Weather in December »
Updated: Aug 7, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

Dewey Beach notes the coldest temperatures in January, with a average high of 41.4°F (5.2°C) and a low of 33.1°F (0.6°C).

How much does it rain?

In Dewey Beach, during the entire year, the rain falls for 89.4 days and collects up to 6.18" (157mm) of precipitation.

When does it snow?

Months with snowfall are January through March, November and December.

When does it snow the most?

The months with the most snowfall are January and December, with an average 0.12" (3mm) of accumulated snow.

How much does it snow in Dewey Beach?

Throughout the year, there are 7.3 snowfall days, and 0.43" (11mm) of snow is accumulated.

What is the month with the lowest UV index?

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the month with the least sunshine?

The month with the least sunshine is February, with an average of 5h of sunshine.

When is Daylight Saving Time (DST) in Dewey Beach?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

When it does not snow?

April through October are months without snowfall.

What is the most humid month?

With an average relative humidity of 82%, May is the most humid month.

What is the month with the highest UV index?

The months with the highest UV index are May through August, with an average maximum UV index of 6.

When are the longest days?

With an average of 14h and 48min of daylight, June has the longest days of the year.

What is the warmest month?

July is the month when Dewey Beach sees the average highest temperatures, with a high of 80.2°F (26.8°C) and a low of 73.6°F (23.1°C).

What month has the most sunshine?

The month with the most sunshine is July, with an average of 11.1h of sunshine.

What is the driest month in Dewey Beach?

September is the month with the least rainfall. Rain falls for 7.5 days and accumulates 0.28" (7mm) of precipitation.

What is the wettest month?

The month with the most rainfall is October, when the rain falls for 6.8 days and typically aggregates up to 0.71" (18mm) of precipitation.

What is the least humid month?

With an average relative humidity of 73%, November is the least humid month.

What is the month with the shortest days?

December has the shortest days of the year in Dewey Beach, with an average of 9h and 30min of daylight.
Today
Tomorrow
Long-term
YearJFMAMJJASOND

Average temperature
Dewey Beach, DE

Average temperature - Dewey Beach, DE

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (41.4°F).

The month with the highest average low temperature is July (73.6°F).
The coldest month (with the lowest average low temperature) is January (33.1°F).

Average pressure
Dewey Beach, DE

Average pressure - Dewey Beach, DE

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed
Dewey Beach, DE

Average wind speed - Dewey Beach, DE

The windiest month (with the highest average wind speed) is January (13mph).
The calmest month (with the lowest average wind speed) is August (8.8mph).

Average humidity
Dewey Beach, DE

Average humidity - Dewey Beach, DE

The month with the highest relative humidity is May (82%).
The month with the lowest relative humidity is November (73%).

Average rainfall
Dewey Beach, DE

Average rainfall - Dewey Beach, DE

The wettest month (with the highest rainfall) is October (0.71").
The driest month (with the least rainfall) is September (0.28").

Average rainfall days
Dewey Beach, DE

Average rainfall days - Dewey Beach, DE

The month with the highest number of rainy days is July (10.2 days).
The month with the least rainy days is November (4.9 days).

Average snowfall
Dewey Beach, DE

Average snowfall - Dewey Beach, DE

The months with the highest snowfall are January and December (0.12").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days
Dewey Beach, DE

Average snowfall days - Dewey Beach, DE

The month with the highest number of snowfall days is January (2.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight / Average sunshine
Dewey Beach, DE

Average daylight / Average sunshine - Dewey Beach, DE

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days
Dewey Beach, DE

Average sunshine days - Dewey Beach, DE

The month with the most sunshine days is January (23.5 days).
The months with the least sunshine days are June and July (18.2 days).

Average UV index
Dewey Beach, DE

Average UV index - Dewey Beach, DE

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).

Average cloud cover
Dewey Beach, DE

Average cloud cover - Dewey Beach, DE

The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 24).

Average visibility
Dewey Beach, DE

Average visibility - Dewey Beach, DE

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Dewey Beach, Delaware, USA

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