Climate and monthly weather forecast
Annapolis, MD

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The Chesapeake Bay at dusk, in Annapolis, Maryland, with a distant view of the US Naval Academy chapel dome
The Chesapeake Bay at dusk, in Annapolis, Maryland, with a distant view of the US Naval Academy chapel dome

The climate of Annapolis

The year-round climatic conditions of Annapolis, Maryland, relate to a subtropical classification under the Köppen Climate System: Cfa. It indicates the city's exposure to a robust seasonal shift, known for its humid subtropical climate and lack of a dry season. Reviewing the data highlights several distinctions in weather-related parameters across different months.

Surveying temperature trends, one observes significant seasonal fluctuation. During winter months, low temperatures hover near freezing, with the coldest months being January and February at 29.8°F (-1.2°C) and 32°F (0°C) respectively. High temperatures in these same months do not exceed the mid-40s°F. From there, a steady increase culminates in the heat of July with a maximum temperature of 84.7°F (29.3°C) and a minimum of a balmy 72°F (22.2°C). Early fall sees this heat decline steadily, wrapping up the year with December temperatures back in the mid-40s°F.

There exists a continuous presence of humidity, with monthly averages between 72% and 78% throughout the year. Rainfall maintains a steady pattern, recording a minimum of 0.47" (12mm) in January, and peaking at 1.69" (43mm) in August. These measurements coincide with the number of rainfall days, which see a high of 14.3 in July and August, and a low of 5.3 in November. Snowfall, though not a frequent occurrence, finds slight prominence between January and March with only a small variation.

Annapolis lays claim to generally favorable winds and sea temperatures. Wind attributes reach a consistent high in January with speeds of up to 10.7mph (17.2km/h) and occasional gusts at 16mph (25.7km/h), before diminishing gradually. Sea temperatures bask in a high of 77.8°F (25.4°C) in August prior to cooling towards the year's end. Sunshine hours and daylight indicate an obvious rise and fall in adherence with the progression of seasons.

The best time to visit Annapolis

Planning a trip to Annapolis leaves ample room for weather-specific preferences. However, given parameters indicating favorable temperature and sunlight, one might lean towards the period from May to September. These months present an encouraging temperature range, fluctuating between 62.2°F (16.8°C) and 84.7°F (29.3°C) alongside an escalation in sea temperatures from 57.4°F (14.1°C) to 77.8°F (25.4°C). Additionally, sunlight hours peak with values reaching 10.8 in July.

The worst time to visit Annapolis

Potential visitors may want to avoid Annapolis during the winter season when temperatures dip, daylight hours recede, and the possibility of snowfall becomes apparent. January and February demonstrate the most challenging conditions, with low temperatures recorded at 29.8°F (-1.2°C) and 32°F (0°C) respectively and a reduction in sunlight hours to 5.3.

Spring weather in Annapolis

The transition period of Spring, spanning from March to May, paints a picture of mild temperatures and increasing daylight. With high temperatures gradually rising from 50.5°F (10.3°C) to 71.2°F (21.8°C), and lows from 38.5°F (3.6°C) to 57.7°F (14.3°C), Spring ushers in warmer days. An increase in rainfall accompanies this warmth, culminating in 0.87" (22mm) in May. Wind speeds begin a steady decline during this period, providing a calm atmosphere for residents and visitors alike.

Summer weather in Annapolis

June to August in Annapolis signifies a period of high temperatures, extended hours of sunlight, and favorable sea temperatures. Marked by temperatures that oscillate between 79.3°F (26.3°C) and 84.7°F (29.3°C), and lows from 66.7°F (19.3°C) to 72°F (22.2°C), summer brings warmth in abundance. Rainfall increases to its yearly peaks during this period, with a high of 1.69" (43mm) in August. Sunshine hours consistently reach their zenith, ensuring plenty of daylight for summer activities.

Autumn weather in Annapolis

The Autumn months of September to November reflect a gradual decrease in temperatures, sunset hours, and rainfall. High temperatures drop steadily from 77°F (25°C) to 54.5°F (12.5°C). Rainfall and numbers of rainfall days lessen considerably, reaching a mere 0.51" (13mm) of precipitation in November. Wind speeds pick up slightly, adding a chill to the diminishing sunlight and reducing sea temperatures.

Winter weather in Annapolis

December through February in Annapolis sees a wintry mix of cold temperatures, reduced daylight hours, and increased wind speeds. These colder months chart minimum temperatures descending towards freezing. With high temperatures lingering between 40.3°F (4.6°C) and 50.5°F (10.3°C), and lows from 29.8°F (-1.2°C) to 38.5°F (3.6°C), caution is advised for outdoor activities. A decrease in precipitation counters slightly with the potential for minimal snowfall. Winter months also highlight the shortest daylight durations and sunrise times of the year.

Weather in January

The year kicks off with typical winter weather in Annapolis. The chilly sensation is in part due to a maximum daytime temperature barely exceeding 40.3°F (4.6°C), along with nighttime lows often dipping just below freezing. This month is marked by an almost constant cloud cover and robust winds. Weather in January »

Weather in February

In February, temperatures in Annapolis gradually start creeping upwards. With the arrival and departure of the snow blanket, conditions vary from wintry chill to early hints of spring. It is an atmospheric tug of war between different seasons. Weather in February »

Weather in March

As spring arrives in the city of Annapolis, the climate begins to shift. Despite the month's characteristic increase in rainfall to an average of 0.67" (17mm) from 0.55" (14mm) in February, the city takes on a cheerier disposition. Weather in March »

Weather in April

April in Annapolis is marked by a visible leap from the lingering chill of early spring to a more comfortable climate. The harbinger of this weather transformation is the significant jump in both daytime and nighttime temperatures. Weather in April »

Weather in May

May sees the city of Annapolis in full spring mode. The noticeable jump in temperature signals the close proximity of summer. Longer days and warmer weather make May the ideal time for outdoor activities and events. However, prospective visitors should prepare for the wettest month of the year in Annapolis. Weather in May »

Weather in June

June in Annapolis announces the arrival of summer. With the increasing sunlight and lengthening of days, the city blossoms into the vibrant summer life. By June, water enthusiasts can relish in the rising sea temperatures, ideal for aquatic activities. Weather in June »

Weather in July

In Annapolis, July owns the title of the hottest month. The heat of the mid-Atlantic summer is felt in full force, with top temperatures reaching as high as 84.7°F (29.3°C). Beaches and pools take center stage as residents and visitors seek relief from the heat. Weather in July »

Weather in August

August in Annapolis continues the summer trend. The heat persists, though slightly less intense than in July. The sea temperature reaches its peak, providing ideal beach conditions. While the city remains bathed in ample sunshine, it is alleviated by an ambient breeze. Weather in August »

Weather in September

September sees Annapolis transitioning from summer into fall. The cooling trend starts, presenting an ideal scenario for those seeking milder temperatures. Autumnal colors begin to paint the cityscape against a backdrop of reduced rainfall, now averaging at 0.63" (16mm). Weather in September »

Weather in October

October marks the full arrival of autumn in Annapolis. The climatic shift is clearly visible with the landscape assuming a palette of vibrant fall colors. As temperatures continue to dip, the crisp autumn air enhances the city’s beauty. Weather in October »

Weather in November

November in Annapolis characteristically brings the first hints of the approaching winter. The climate experiences a definite chill as temperatures fall consistently. It serves as a prelude to the winter season with the wind speed experiencing another increase. Weather in November »

Weather in December

December brings the full arrival of winter, with colder days and longer nights. The temperature drops further with the noticeable chill in the air signaling the arrival of the holiday season. A notable feature of December is its first snowfall, with an average thickness of 0.12" (3mm). Weather in December »
Updated: Jun 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month?

January is the coldest month of the year in Annapolis, registering average temperatures as high as 40.3°F (4.6°C) and as low as 29.8°F (-1.2°C).

What is the least humid month?

The months with the lowest humidity are January, March, April and November, with an average relative humidity of 72%.

What is the driest month?

The month with the least rainfall is January, when the rain falls for 6 days and typically collects 0.47" (12mm) of precipitation.

How many days does it rain?

Throughout the year, there are 120.4 rainfall days, and 10.47" (266mm) of precipitation is accumulated.

When does it snow?

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

When does it snow the most?

January is the month with the most snowfall. Snow falls for 2.3 days and accumulates 0.67" (17mm) of snow.

How much does it snow in Annapolis?

Throughout the year, there are 8.3 snowfall days, and 1.22" (31mm) of snow is accumulated.

What are the months 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 month is the ocean coldest?

The month with the coldest seawater is February, with an average ocean temperature of 45.1°F (7.3°C).

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)?

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?

In Annapolis, Maryland, snow does not fall in April through October.

What is the most humid month?

The most humid month is May, with an average relative humidity of 78%.

What are the months 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?

The month with the longest days is June, with an average of 14h and 54min of daylight.

What month is the hottest?

July stands out as Annapolis's warmest month, with an average high-temperature of 84.7°F (29.3°C) and a low-temperature of 72°F (22.2°C).

What month has the most sunshine in Annapolis?

With an average of 10.8h of sunshine, July has the most sunshine of the year.

What is the wettest month?

August is the month with the most rainfall. Rain falls for 14.3 days and accumulates 1.69" (43mm) of precipitation.

When is the ocean warmest?

With an average ocean temperature of 77.7°F (25.4°C), August is the month with the warmest seawater.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 30min of daylight.
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Average temperature
Annapolis, MD

Average temperature - Annapolis, MD

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (40.3°F).

The month with the highest average low temperature is July (72°F).
The coldest month (with the lowest average low temperature) is January (29.8°F).

Average pressure
Annapolis, MD

Average pressure - Annapolis, MD

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed
Annapolis, MD

Average wind speed - Annapolis, MD

The windiest month (with the highest average wind speed) is January (10mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

Average humidity
Annapolis, MD

Average humidity - Annapolis, MD

The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January, March, April and November (72%).

Average rainfall
Annapolis, MD

Average rainfall - Annapolis, MD

The wettest month (with the highest rainfall) is August (1.69").
The driest month (with the least rainfall) is January (0.47").

Average rainfall days
Annapolis, MD

Average rainfall days - Annapolis, MD

The months with the highest number of rainy days are July and August (14.3 days).
The month with the least rainy days is November (5.3 days).

Average snowfall
Annapolis, MD

Average snowfall - Annapolis, MD

The month with the highest snowfall is January (0.67").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days
Annapolis, MD

Average snowfall days - Annapolis, MD

The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature
Annapolis, MD

Average sea temperature - Annapolis, MD

The best month for swimming (with the highest average sea temperature) is August (77.8°F).
The coldest month (with the lowest average sea temperature) is February (45.1°F).

Average daylight / Average sunshine
Annapolis, MD

Average daylight / Average sunshine - Annapolis, MD

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days
Annapolis, MD

Average sunshine days - Annapolis, MD

The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is August (13.8 days).

Average UV index
Annapolis, MD

Average UV index - Annapolis, MD

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
Annapolis, MD

Average cloud cover - Annapolis, MD

The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility
Annapolis, MD

Average visibility - Annapolis, MD

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).

Annapolis, Maryland, USA

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