Climate and monthly weather forecast
Mystic, CT

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The climate of Mystic

Mystic, Connecticut, is characterized by a Marine West Coast climate, with warm summers, as described by the Köppen climate classification Cfb. Sitting at the mouth of the Mystic river, this charming maritime town experiences an array of weather conditions throughout the year. Given its geographical position, it's much influenced by the Atlantic Ocean, which tends to moderate summer heat and winter cold.

Temperature fluctuations are a regularity in Mystic. High temperatures range from a chilly 36.5°F (2.5°C) in January to a pleasant 77.9°F (25.5°C) in July compared to low temperatures that vary from a cold 26.6°F (-3°C) in January up to a moderately warm 66.9°F (19.4°C) in July. Overall, temperatures stay mild to warm, benefiting from the climate type. Humidity also changes over the year, varying from 74% to 81%.

Rainfall in Mystic oscillates from month to month, with an average of 3.86" (98mm) being recorded in December, marking the peak of the city's annual precipitation. The driest period occurs in September, with an average rainfall of 1.73" (44mm). Snow is not a frequent phenomenon, highest snowfall of 2.44" (62mm) registered in March.

Unique points to highlight in Mystic's weather are its relatively constant visibility, set at an average of 6 miles throughout the year. Furthermore, the UV index, not reaching beyond 6 throughout the months, is significantly lower compared to many national averages.

The best time to visit Mystic

The perfect time to visit Mystic largely depends on the visitor's weather preferences. For beach, and water recreational activities, warmer summer temperatures from June to August, ranging between 70.9°F (21.6°C) and 77.9°F (25.5°C) in highs, prove ideal. Besides, the Atlantic Ocean is warmest during these months, with temperatures peaking at 70.3°F (21.3°C) in August, which is optimum for various marine activities.

For those who prefer cooler temperatures, comfortable weather can be found from September to November. During these months, temperatures decline progressively from highs of 71.4°F (21.9°C) in September to 51.3°F (10.7°C) in November, creating superb conditions for exploring Mystic's historic town center or hiking the nearby trails.

The worst time to visit Mystic

Adverse weather conditions in Mystic are often experienced from January to March. In January and February temperatures drop to lows of 26.6°F (-3°C) and 27.3°F (-2.6°C) respectively, along with a significant increase of snowfall, peaking at 2.44" (62mm) in March. This period could make outside activities challenging and uncomfortable, especially for those unprepared for such cold conditions.

Spring weather in Mystic

The onset of spring in Mystic comes with a notable rise in temperatures, reaching up to 52.5°F (11.4°C) in April from the lower temperatures of March. By the end of spring in May, high temperatures reach 62.6°F (17°C), creating perfect conditions for outdoor explorations. The rainfall during this season varies from 2.95" (75mm) in March up to 3.23" (82mm) in April, thus, carrying a mild rainfall gear could be beneficial.

Summer weather in Mystic

Known for its warm summers, Mystic experiences average high temperatures between 70.9°F (21.6°C) and 77.9°F (25.5°C) from June to August. An increase in daylight to a peak of 15.1 hours in June allows ample time for sightseeing and marine activities. One important aspect to consider is the rise in humidity during summer, averaging 80% and peaking at 81% in June.

Autumn weather in Mystic

Autumn brings a gradual decrease in temperature, with October highs averaging 61.7°F (16.5°C), falling to 51.3°F (10.7°C) by November. Though rainfall increases to a yearly maximum of 3.43" (87mm) in October, this period offers scenic beauty with a plethora of autumn colors, characteristic of New England's Fall.

Winter weather in Mystic

Notably wintery, Mystic's December to February period is characterized by temperatures ranging within 42.3°F (5.7°C) to 36.5°F (2.5°C) in high and 33.4°F (0.8°C) to 26.6°F (-3°C) in low. An accumulation of snowfall that could reach 1.65" (42mm) in December and 1.89" (48mm) in February is another remarkable winter feature. Despite these rigid conditions, Mystic winter can offer a quiet and peaceful retreat, decorated with festive illuminations during the holiday period.

Weather in January

In Mystic, January persists as the coldest month with an average high of only 36.5°F (2.5°C) and sun for just 5.2 hours per day. A crisp wind moving at a monthly average of 12.4mph (20km/h) whisks in the New Year, setting the tone for the frosty month ahead. Weather in January »

Weather in February

Moving into February, Mystic's winter weather remains quite consistent with an increase in temperature to 38.1°F (3.4°C) being the only notable change. As the shortest month of the year, with daylight hours of just 10.6 hours, February makes for a cozy season. Weather in February »

Weather in March

Greeting spring, March showcases a major shift, with temperatures rising to an average high of 43.3°F (6.3°C). The transition from the frigid cold to a somewhat warmer climate is greatly welcomed by the locals and tourists. Even though the temperatures start to climb, Mystic retains its rainfall level to about 2.95" (75mm) scattered across 12.6 days. Weather in March »

Weather in April

April experiences a significant leap in temperatures to a welcoming 52.5°F (11.4°C), signaling the peak of the short-lived spring. With the snow completely melted away, locals and tourists can now enjoy full days outside. The landscape transitions from the drab winter tones to vibrant springtime hues, with flowering trees accentuating Mystic's quaint charm. Weather in April »

Weather in May

With the passing of time, May sees Mystic fully immersed in the warmth of spring, setting the stage for the impending summer. Mystic throws off its winter coat as the temperature climbs to an average high of 62.6°F (17°C). The coastal town becomes a hive of outdoor activities, including outdoor dining, hiking, and waterfront sightseeing, among others. Weather in May »

Weather in June

The onset of June indicates the arrival of summer to Mystic, with average high temperatures reaching 70.9°F (21.6°C). The longer daylight hours, offering a maximum of 15.1 hours, mark the summer solstice period. This transitional phase into summer imbues the city with a vibrant hustle and bustle as locals and tourists alike venture outdoors to make the most of the warm weather and clear skies. Weather in June »

Weather in July

July, the heart of the summer season, brings Mystic's highest temperature, reaching up to 77.9°F (25.5°C). Thus, the city morphs into a bustling summer haven, teeming with tourists exploring the local attractions and stunning coastline. Weather in July »

Weather in August

Even though August is typically characterized by slightly lower temperatures, the mercury levels remain high, ensuring the continuation of Mystic's summer spirits. The prevalence of long daylight hours, close to 13.8 hours, ensures visitors ample time to explore the natural and cultural richness of the city. Weather in August »

Weather in September

September bids goodbye to summer with a notable decrease in temperature scale. The average high drops to 71.4°F (21.9°C), a perfect transition from the hot summer towards the cooler autumn. As autumn colors start to show, the city of Mystic transforms into an artist's palette with hues of gold, orange, and red. Weather in September »

Weather in October

The warmth of October makes it a popular month for visitors to the historic seaport city. As the month progresses, the foliage changes color, providing a splendid display of fall hues. All this while, the average high temperature cools to a comfortable 61.7°F (16.5°C). Weather in October »

Weather in November

November puts a marker on fall's end, with average high temperatures taking a dip to 51.3°F (10.7°C). As the crisp autumn air starts to turn chilly, Mystic gears up for the wintry season ahead. The vibrancy of autumn begins to fade, making way for the bare, winter-ready trees. Weather in November »

Weather in December

The arrival of December witnesses Mystic embracing winter once again, with temperatures dropping to an average high of 42.3°F (5.7°C). The city prepares for the holiday season, with festive decor adding to its charm. Snow starts to reappear, dusting the cityscape with a light coat and bringing around 4.5 snowfall days. Weather in December »
Updated: Aug 5, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest time of year?

Mystic records the coldest temperatures in January, averaging a high of 36.5°F (2.5°C) and a low of 26.6°F (-3°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 74%.

How many days does it rain in Mystic?

In Mystic, Connecticut, during the entire year, the rain falls for 166.1 days and collects up to 34.09" (866mm) of precipitation.

When does it snow?

January through April, October through December are months with snowfall.

How many days does it snow?

In Mystic, during the entire year, snow falls for 24.7 days and aggregates up to 7.87" (200mm) of snow.

When is the lowest UV index in Mystic?

January through March 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 37.9°F (3.3°C).

What is the month with the least sunshine?

February and December, with an average of 4.9h of sunshine, are months with the least sunshine.

When does it snow the most?

The month with the most snowfall is March, when snow falls for 5.3 days and typically aggregates up to 2.44" (62mm) of snow.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Mystic, 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 Mystic, snow does not fall in May through September.

What is the most humid month?

With an average relative humidity of 81%, June is the most humid month.

When are the longest days?

June has the longest days of the year, with an average of 15h and 6min of daylight.

When is the highest UV index?

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

What is the hottest time of year?

Mystic's July weather, with an average high temperature of 77.9°F (25.5°C) and an average low temperature of 66.9°F (19.4°C), tends to be the warmest of the year.

What month is the ocean warmest?

The month with the warmest seawater is August, with an average ocean temperature of 70.3°F (21.3°C).

What month has the most sunshine?

The month with the most sunshine is August, with an average of 10.6h of sunshine.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 12.8 days and typically collects 1.73" (44mm) of precipitation.

What is the wettest month?

The month with the most rainfall in Mystic is December, when the rain falls for 13.4 days and typically aggregates up to 3.86" (98mm) of precipitation.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 12min of daylight.
Today
Tomorrow
Long-term
YearJFMAMJJASOND

Average temperature
Mystic, CT

Average temperature - Mystic, CT

The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (36.5°F).

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).

Average pressure
Mystic, CT

Average pressure - Mystic, CT

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed
Mystic, CT

Average wind speed - Mystic, CT

The windiest month (with the highest average wind speed) is January (12.4mph).
The calmest month (with the lowest average wind speed) is August (8.1mph).

Average humidity
Mystic, CT

Average humidity - Mystic, CT

The month with the highest relative humidity is June (81%).
The months with the lowest relative humidity are January, March, April and November (74%).

Average rainfall
Mystic, CT

Average rainfall - Mystic, CT

The wettest month (with the highest rainfall) is December (3.86").
The driest month (with the least rainfall) is September (1.73").

Average rainfall days
Mystic, CT

Average rainfall days - Mystic, CT

The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is February (10.1 days).

Average snowfall
Mystic, CT

Average snowfall - Mystic, CT

The month with the highest snowfall is March (2.44").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days
Mystic, CT

Average snowfall days - Mystic, CT

The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average sea temperature
Mystic, CT

Average sea temperature - Mystic, CT

The best month for swimming (with the highest average sea temperature) is August (70.3°F).
The coldest month (with the lowest average sea temperature) is February (37.9°F).

Average daylight / Average sunshine
Mystic, CT

Average daylight / Average sunshine - Mystic, CT

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).

Average sunshine days
Mystic, CT

Average sunshine days - Mystic, CT

The month with the most sunshine days is November (16.5 days).
The months with the least sunshine days are June and July (11.7 days).

Average UV index
Mystic, CT

Average UV index - Mystic, CT

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

Average cloud cover
Mystic, CT

Average cloud cover - Mystic, CT

The months with the most cloud cover are February, March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 28).

Average visibility
Mystic, CT

Average visibility - Mystic, CT

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).

Mystic, Connecticut, USA

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