Climate and monthly weather forecast
Norwalk, CT

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The tourist attraction spot of a stone house home to the Sheffield Island lighthouse in Norwalk, Connecticut
The tourist attraction spot of a stone house home to the Sheffield Island lighthouse in Norwalk, Connecticut

The climate of Norwalk

Taking account of geographical position and the set of climatological parameters, Norwalk, Connecticut, USA is classified as a Humid Subtropical climate according to the Köppen climate classification system. In this classification, a key feature is that there is no dry season, and the climate maintains a fairly consistent humidity throughout the year, with relative humidity averaging between 72% and 76% during the twelve months.

Norwalk experiences a noticeable range in temperatures during the year. In the warmer months of July and August, average high temperatures reach up to 81.1°F (27.3°C) and 80.1°F (26.7°C) respectively. In stark contrast, the colder months of January and February record low average temperatures of 26.4°F (-3.1°C) and 27.3°F (-2.6°C). Snowfall occurs predominantly in these colder months, precisely from December to March, in quantities between 2.01" (51mm) and 2.83" (72mm).

Rainfall is not biased to any particular season in Norwalk; there is observable precipitation throughout the year. Equally distributed through a year, rainfall quantity ranges from 2.36" (60mm) to 4.13" (105mm). The month observing the highest average rainfall is July, with 4.13" (105mm), while the least falls in January and February with 2.36" (60mm) each. It is interesting to note that months signaling the start of seasons, namely April, July, and October, present a higher number of rainfall days.

The best time to visit Norwalk

Given that weather preferences can vary dramatically from person to person, the recommended time to visit Norwalk could differ. However, considering factors such as temperature, humidity, and rainfall, the months from late spring to early fall could provide the most agreeable conditions. Ranging from May to September, the temperatures are moderate, with highs oscillating from 65.8°F (18.8°C) to 80.1°F (26.7°C). These months also see reduced wind speeds, descending from a maximum of 9.1mph (14.6km/h) in April to a minimum of 6.5mph (10.5km/h) in July.

Several outdoor activities can be planned during this period thanks to longer daylight hours. June boasts the longest daylight duration of 15.1 hours, which slowly descends to 12.5 hours by September.

The worst time to visit Norwalk

Less hospitable for visitors without a preference for cold weather, the months from December to February could present a challenge. Average high temperatures during this period barely touch the mid-thirties in Fahrenheit, while lows can drop below freezing. Accompanied by strong winds, up to 9.8mph (15.8km/h) to be precise, these low temperatures may feel even more numbing. It is also during these winter months that Norwalk sees its most significant snowfall, reaching up to 2.83" (72mm) in February.

Spring weather in Norwalk

Spring months from March to May in Norwalk see a steady increase in temperatures from an average high of 44.4°F (6.9°C) in March to 65.8°F (18.8°C) in May. Simultaneously, daylight hours are also on the rise, increasing from 12 hours in March to 14.5 hours in May. Even with these warming conditions, rainfall sees an uptick in both quantity and number of days. While March receives an average of 2.8" (71mm) of rain over 12.5 days, May collects an average of 3.11" (79mm) over 17.1 days.

Summer weather in Norwalk

Summers in Norwalk are marked by warm temperatures, long daylight hours, and consistent humidity. Average high temperatures from June to August fluctuate between 74.1°F (23.4°C) and 81.1°F (27.3°C), while low temperatures rarely dip below the high sixties. Daylight hours peak in June, extending up to 15.1 hours. Despite this abundance of sunlight, summers also register the highest occurrences of rainfall, with July seeing an average 4.13" (105mm) over 18.1 days.

Autumn weather in Norwalk

Shifting from September through November, autumn in Norwalk is characterised by decreasing temperatures and daylight hours. Highs plunge from 73°F (22.8°C) in September to 50.9°F (10.5°C) in November, while daylight reduces from 12.5 hours to 9.9 hours. Rainfall continues to be significant during this period with October witnessing the second-highest rainfall in the year, reaching 3.5" (89mm).

Winter weather in Norwalk

Winter arrives in Norwalk in December and lasts through February. During this period, the temperature visibly dips with average highs going from 41.9°F (5.5°C) in December to a low of 35.8°F (2.1°C) in January. Lower temperatures are accompanied by shorter daylight hours, dropping to 9.3 hours in December. This season is also marked by snowfall, peaking at 2.83" (72mm) in February.

Weather in January

The year kicks off in Norwalk, Connecticut, USA with typically winter conditions. January typically brings a chilly combination of snow and rainfall, rendering the city a winter wonderland. With mean daily high temperatures of 35.8°F (2.1°C) and lows dipping to 26.4°F (-3.1°C), Norwalk residents are quite acquainted with the cold. Weather in January »

Weather in February

Compared to January, February is a slightly warmer but anticipated cold winter month. Norwalk sustains moderately high relative humidity at 76%, contributing to the overall chill in the air. Temperatures rise marginally from January, with highs reaching up to 38.1°F (3.4°C) and lows at 27.3°F (-2.6°C). Weather in February »

Weather in March

March signals the shift from intense winter pressures to the beginning of the spring season in Norwalk. There's an evident jump in temperature ranges from February, as the highs hit 44.4°F (6.9°C) and lows rise to 33.4°F (0.8°C). Weather in March »

Weather in April

April sees the full bloom of spring in Norwalk with its share of consistent rain showers. April’s weather deviates considerably from March's, characterized by warmer temperatures, increased daylight hours, and a substantial dip in snowfall. Weather in April »

Weather in May

May brings a breath of fresh air in Norwalk with pleasant temperatures marking the transition into summer. The city witnesses higher temperatures with highs soaring up to 65.8°F (18.8°C) and lows maintaining a mild 52.7°F (11.5°C). Weather in May »

Weather in June

June introduces the summer solstice in Norwalk, bringing the longest period of daylight for the year. While noticeably warmer than May, temperatures still hover in the pleasant range, with highs peaking at 74.1°F (23.4°C) and lows at approximately 61°F (16.1°C). Weather in June »

Weather in July

July is the warmest month in Norwalk, showcasing typical summer weather and high sun exposures. Temperatures rise significantly from June, topping at 81.1°F (27.3°C) for high temperatures, and 68.2°F (20.1°C) for low temperatures. Weather in July »

Weather in August

The summer season reaches its finale in August, with temperature highs nearly matching those of July at 80.1°F (26.7°C), and lows resting at 67.8°F (19.9°C). Although warmer than June, August brings an appealing end to the summer season, balancing heat with the slight cooling breeze. Weather in August »

Weather in September

September in Norwalk ushers in the fall season, with temperatures retreating from the summer highs. High temperatures drop to 73°F (22.8°C) and low temperatures to 61.2°F (16.2°C), signaling the arrival of mild temperatures. Weather in September »

Weather in October

October in Norwalk emerges as a true fall month. The weather, cooler than September’s, necessitates warmer clothing, as high temperatures average at 61.9°F (16.6°C) and low temperatures dive to 51.3°F (10.7°C). The trees in Norwalk adorn vibrant colored foliage, adding charm to the city's landscape. Weather in October »

Weather in November

November sees a brisk drop in temperatures, hinting at the approaching winter. With high temperatures averaging 50.9°F (10.5°C) and low temperatures falling to 40.3°F (4.6°C), chilly winds signify the reign of winter in the near future. Weather in November »

Weather in December

December marks the onset of winter and festive cheer in Norwalk. The weather in December considerably drops from November, with high temperatures reaching 41.9°F (5.5°C) and low temperatures falling to 32.9°F (0.5°C). Along with the festive excitement, residents brace for the cold, chilly winds, frosty mornings, and possibilities of snowfall characteristic to the month, rounding off the year on a wintry note. Setting in of December comes with a decrease in the average high-temperature, moving from a cool 50.9°F (10.5°C) in November to a cold 41.9°F (5.5°C). Weather in December »
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months in Norwalk?

The coldest period tends to be January, when average temperatures fluctuate between a high of 35.8°F (2.1°C) and a low of 26.4°F (-3.1°C).

What is the driest month in Norwalk?

January and February are months with the least rain when the rain falls for 8.3 days and typically aggregates up to 2.36" (60mm) of rain.

How much does it rain in Norwalk?

In Norwalk, Connecticut, during the entire year, the rain falls for 166.3 days and collects up to 37.87" (962mm) of precipitation.

When does it snow in Norwalk?

January through April, November and December are months with snowfall in Norwalk.

How many days does it snow in Norwalk?

In Norwalk, Connecticut, during the entire year, snow falls for 24.6 days and aggregates up to 9.61" (244mm) of snow.

What is the month with the lowest UV index in Norwalk?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Norwalk.

What are the most humid months in Norwalk?

February, May and June, with an average relative humidity of 76%, are most humid months.

When does it snow the most in Norwalk?

The month with the most snowfall is February, when snow falls for 7.4 days and typically aggregates up to 2.83" (72mm) of snow.

When is the ocean coldest in Norwalk?

The month with the coldest seawater is February, with an average ocean temperature of 39°F (3.9°C).

What is the month with the least sunshine in Norwalk?

February has the least sunshine of the year in Norwalk, Connecticut, with an average of 4.7h of sunshine.

When is Daylight Saving Time (DST) in Norwalk?

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.

What are the least humid months in Norwalk?

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

When it does not snow in Norwalk?

In Norwalk, Connecticut, snow does not fall in May through October.

When are the longest days in Norwalk?

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

What is the month with the highest UV index in Norwalk?

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

What is the warmest month in Norwalk?

July is the warmest month, with an average high-temperature of 81.1°F (27.3°C) and an average low-temperature of 68.2°F (20.1°C).

What is the wettest month in Norwalk?

The month with the most rainfall in Norwalk is July, when the rain falls for 18.1 days and typically aggregates up to 4.13" (105mm) of precipitation.

What month has the most sunshine in Norwalk?

With an average of 10.5h of sunshine, July has the most sunshine of the year.

When is the ocean warmest in Norwalk?

With an average ocean temperature of 73°F (22.8°C), August is the month with the warmest seawater.

What is the month with the shortest days in Norwalk?

With an average of 9h and 18min of daylight, December has the shortest days of the year.
Today
Tomorrow
Long-term
YearJFMAMJJASOND

Average temperature
Norwalk, CT

Average temperature - Norwalk, CT

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (35.8°F).

The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).

Average pressure
Norwalk, CT

Average pressure - Norwalk, CT

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed
Norwalk, CT

Average wind speed - Norwalk, CT

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).

Average humidity
Norwalk, CT

Average humidity - Norwalk, CT

The months with the highest relative humidity are February, May and June (76%).
The months with the lowest relative humidity are April and November (72%).

Average rainfall
Norwalk, CT

Average rainfall - Norwalk, CT

The wettest month (with the highest rainfall) is July (4.13").
The driest months (with the least rainfall) are January and February (2.36").

Average rainfall days
Norwalk, CT

Average rainfall days - Norwalk, CT

The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is January (8.3 days).

Average snowfall
Norwalk, CT

Average snowfall - Norwalk, CT

The month with the highest snowfall is February (2.83").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days
Norwalk, CT

Average snowfall days - Norwalk, CT

The month with the highest number of snowfall days is February (7.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature
Norwalk, CT

Average sea temperature - Norwalk, CT

The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is February (39°F).

Average daylight / Average sunshine
Norwalk, CT

Average daylight / Average sunshine - Norwalk, 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 18min).

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days
Norwalk, CT

Average sunshine days - Norwalk, CT

The month with the most sunshine days is January (17.8 days).
The month with the least sunshine days is June (10 days).

Average UV index
Norwalk, CT

Average UV index - Norwalk, 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, November and December (UV index 2).

Average cloud cover
Norwalk, CT

Average cloud cover - Norwalk, CT

The months with the most cloud cover are February, March and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility
Norwalk, CT

Average visibility - Norwalk, 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).

Norwalk, Connecticut, USA

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