Climate and monthly weather forecast
Marietta, GA

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The climate of Marietta

Marietta, positioned in the state of Georgia, USA, endures a humid subtropical climate - a climate type labeled as Cfa under the Köppen climate classification. Humidity permeates the atmosphere year-round, with a relative humidity range from 68% to 78%. The city lies in a zone with no dry season, receiving consistent reinfall throughout the year, varying from 2.24" (57mm) to 4.88" (124mm) per month. Splendidly, sunshine hours per day follow an ascending and descending trend, with a peak of 10.6 hours in July and a nadir of 5 hours in December.

Tracking temperatures through the months in Marietta, January is the coldest with a low average of 34.2°F (1.2°C), and summer witnesses the highest average temperature of 90.5°F (32.5°C) in July. Wind speed bears light changes over the months as it hovers from 4.7mph (7.6km/h) to 8.1mph (13km/h). A cloud cover percentage sticks around 32% to 48%, implying a fair amount of sunshine is guaranteed to visitors or residents. The UV index remains at a low level of 3 during winter months and steps up to a moderate level of 6 in sun-drenched summer. Noticeably, Marietta experiences a certain level of snowfall in winter months, especially January that gets almost an inch of snow, albeit snowfall days per year are trivial.

The best time to visit Marietta

Fall, precisely late October to November, claims the accolade as the finest time to visit Marietta, Georgia. During these months, the weather delicately balances warm, welcoming afternoons with cooler nights, averaging from 43.7°F (6.5°C) to 72.7°F (22.6°C). With rain highest at 4.88" (124mm) in August, rainfall in the autumn months trims down to the lowest at 2.24" (57mm) in October. Humidity drops to a comfortable level as well, while the frequency and intensity of storms dwindle, providing tranquil, clear skies for outdoor exploration.

The worst time to visit Marietta

Unfavorable weather conditions dress the stage of Marietta during summer, particularly in July. The city endures the highest temperatures, with an average high of 90.5°F (32.5°C), alongside the highest relative humidity of 70%. These factors often combine to create an extremely hot and humid climate, which can be stifling for those unaccustomed to such weather conditions. Additionally, July has the peak daylight hours of 14.2, making the days long and potentially blistering.

Spring weather in Marietta

Springtime in Marietta, from late March to early June, paints a picture of milder weather. Rising temperatures buffet between a low of 45°F (7.2°C) in March to a high of 80.8°F (27.1°C) in May. During this season, both cloud cover and rainfall increase, with numbers fluctuating from 2.76" (70mm) to 3.94" (100mm) of rain per month, coupled with a cloud cover percentage fluctuating around 34% to 47%. As daylight hours stretch from 12 to 13.9 hours per day, this period allows abundant opportunities for outdoor activities.

Summer weather in Marietta

Marietta presents a typical humid subtropical summer from June to August. Daytime high temperatures soar from 80.8°F (27.1°C) to 90.5°F (32.5°C) with interjecting thunderstorms frequently cooling off the hot days. Rainfall depicts an increasing trend, moving from 3.46" (88mm) in June to 4.88" (124mm) in August. Despite high humidity and rainfall, the sun shines brightly for about 14.4 hours in June, eventually reducing to 13.4 hours in August.

Autumn weather in Marietta

As summer begins to wane, Autumn in Marietta, from September through November, witnesses a decrease in rainfall, with amounts falling from 2.76" (70mm) to 3.03" (77mm) per month. Simultaneously, temperatures make a comfortable transition from 84°F (28.9°C) in September to 61°F (16.1°C) in November. These are the months boasting the highest percentage of sunshine days, brightening up to 20.1 days in October.

Winter weather in Marietta

Finally, winter steps in from December to February with temperatures ranging between a low of 34.2°F (1.2°C) and a high of 54.9°F (12.7°C). With decreasing daylight hours from 9.9 hours to 10.2 hours among the winter months, Marietta enjoys the highest relative humidity, reaching up to 78% in December. Precipitation in the form of snowfall occurs occasionally, specifically in January with 0.98" (25mm) of snow observed on an average of 1.6 days.

Weather in January

With the year's commencement, Marietta, Georgia greets its residents with a hint of snow. The relative humidity soars to the peak of 74%. The shift from January to February sees a slight increase in temperature, making the days marginally warmer. Weather in January »

Weather in February

A transition from January to February marks a subtle rise in Marietta's temperature accompanied by the fragrant arrival of early spring blooms. A noteworthy aspect is the average rainfall of 3.58" (91mm), providing a moist environment favourable for plant growth. Weather in February »

Weather in March

In March, the weather fluctuates moderately between fresh, warm days and cool, breezy nights. Ensuring a consistent vision across Marietta the visibility stays at 6 miles. As the city moves into April, there is a heightened sense of spring euphoria with slightly warmer days. Weather in March »

Weather in April

April heralds the full bloom of spring in Marietta, showcasing a plethora of colors and aromas. The average highest temperature shifts to 72.5°F (22.5°C), substantiating the arrival of warmer days. There is a marked decrease in rainfall from April to May, hinting at the impending dry spell. Weather in April »

Weather in May

May observes a significant climb in temperature, introducing Marietta's inhabitants to longer and warmer days. Residents keep an eye out for the highest rainfall of the year, averaging about 3.94" (100mm). As June rolls in, the increase in heat can be noticeably felt. Weather in May »

Weather in June

June in Marietta sees a steady rise in temperature, signifying the commencement of the summer season. Particularly impressing is the amount of sunshine received: about 10.5 hours per day, promising sun-filled days throughout the month. Weather in June »

Weather in July

July is predominantly hot in Marietta, marking the height of the summer season. With recorded highest temperature hovering around 90.5°F (32.5°C), it's the warmest month in the city. The sweltering heat of July moderately cools off as August arrives. Weather in July »

Weather in August

Marietta in August witnesses a slight dip in temperature, giving respite from July's intense heat. Accompanying the end of August, there is a substantial increase in rainfall - about 4.88" (124mm) - preparing the way for falls. The transition into September carries a promise of slightly cooler days to come. Weather in August »

Weather in September

September rings in the fall season in Marietta, with the temperature displaying a significant plunge compared to August's. Interestingly, the average number of sunny days soars to 15.5, hinting at clear, crisp autumn skies. The autumnal equinox by the end of September paves the way for October, characterized by even cooler temperatures. Weather in September »

Weather in October

Come October, Marietta adorns a new look, with leaves taking on hues of yellow, orange, and brown. The city experiences a considerable drop in temperature, especially during the evenings. As the city heads towards November, the nights grow colder, indicating the arrival of winter. Weather in October »

Weather in November

November, the last month of the autumn in Marietta, is also an enjoyable month, with temperature in the range of an average high of 61°F (16.1°C) and an average low of 43.7°F (6.5°C). Marietta's progression into November involves a drop in the average high-temperature, receding from a pleasant 72.7°F (22.6°C) in October to a comfortable 61°F (16.1°C). Weather in November »

Weather in December

Concluding the year, December brings the chills back to the city of Marietta. Witnessing the first snowfall of the winter season, Marietta records an average of 0.67" (17mm) of snow. The progression from December to January results in a slight decrease in temperature. Weather in December »
Updated: Feb 10, 2024 | Published by: Weather U.S. | Resources

Frequently asked questions

What part of the year is the coldest in Marietta?

With its average high temperature of 49.6°F (9.8°C) and a low of 34.2°F (1.2°C), January is regarded as the coldest month.

How much does it rain in Marietta?

Throughout the year, in Marietta, Georgia, there are 177.1 rainfall days, and 41.93" (1065mm) of precipitation is accumulated.

When does it snow in Marietta?

Months with snowfall in Marietta, Georgia, are January through March and December.

When does it snow the most in Marietta?

January is the month with the most snowfall. Snow falls for 1.6 days and accumulates 0.98" (25mm) of snow.

How much does it snow in Marietta?

Throughout the year, in Marietta, there are 4.5 snowfall days, and 2.6" (66mm) of snow is accumulated.

When is the lowest UV index in Marietta?

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.

When is Daylight Saving Time (DST) in Marietta?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Marietta, Georgia, 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 Marietta?

In Marietta, Georgia, snow does not fall in April through November.

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

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

When are the longest days in Marietta?

With an average of 14h and 24min of daylight, June has the longest days of the year in Marietta.

What time of the year is the hottest in Marietta?

July registers as the month with the average highest temperatures in Marietta, Georgia, reaching 90.5°F (32.5°C) at its peak and 71.4°F (21.9°C) at the lowest.

What month has the most sunshine in Marietta?

With an average of 10.6h of sunshine, July has the most sunshine of the year in Marietta, Georgia.

What is the least humid month in Marietta?

With an average relative humidity of 68%, August is the least humid month.

What is the wettest month in Marietta?

The month with the most rainfall is August, when the rain falls for 18.8 days and typically aggregates up to 4.88" (124mm) of precipitation.

What is the driest month in Marietta?

October is the month with the least rainfall. Rain falls for 10.2 days and accumulates 2.24" (57mm) of precipitation.

What is the most humid month in Marietta?

With an average relative humidity of 78%, December is the most humid month.

What is the month with the shortest days in Marietta?

December has the shortest days of the year in Marietta, Georgia, with an average of 9h and 54min of daylight.

What is the month with the least sunshine in Marietta?

December has the least sunshine of the year in Marietta, Georgia, with an average of 5h of sunshine.

Average temperature
Marietta, GA

Average temperature - Marietta, GA

The warmest month (with the highest average high temperature) is July (90.5°F).
The month with the lowest average high temperature is January (49.6°F).

The month with the highest average low temperature is July (71.4°F).
The coldest month (with the lowest average low temperature) is January (34.2°F).

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Average pressure
Marietta, GA

Average pressure - Marietta, GA

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).

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Average wind speed
Marietta, GA

Average wind speed - Marietta, GA

The windiest month (with the highest average wind speed) is January (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).

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Average rainfall
Marietta, GA

Average rainfall - Marietta, GA

The wettest month (with the highest rainfall) is August (4.88").
The driest month (with the least rainfall) is October (2.24").

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Average rainfall days
Marietta, GA

Average rainfall days - Marietta, GA

The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (9.5 days).

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Average snowfall
Marietta, GA

Average snowfall - Marietta, GA

The month with the highest snowfall is January (0.98").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days
Marietta, GA

Average snowfall days - Marietta, GA

The month with the highest number of snowfall days is January (1.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Marietta, GA

Average daylight / Average sunshine - Marietta, GA

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).

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Average sunshine days
Marietta, GA

Average sunshine days - Marietta, GA

The month with the most sunshine days is October (20.1 days).
The month with the least sunshine days is July (9.6 days).

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Average UV index
Marietta, GA

Average UV index - Marietta, GA

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, November and December (UV index 3).

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Average visibility
Marietta, GA

Average visibility - Marietta, GA

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).

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Marietta, Georgia, USA

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