Climate and monthly weather forecastMarietta, GA
Climate and monthly weather forecast
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, Georgia, 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 refreshing month, with an average temperature varying between 61°F (16.1°C) and 43.7°F (6.5°C). With November's arrival, Marietta sees a decrease in average high-temperatures, moving from a pleasant 72.7°F (22.6°C) in October to a refreshing 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: Aug 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Temperature records mark January as the coldest month, with highs averaging 49.6°F (9.8°C) and lows at 34.2°F (1.2°C).
In Marietta, during the entire year, the rain falls for 177.1 days and collects up to 41.93" (1065mm) of precipitation.
Months with snowfall are January through March and December.
The month with the most snowfall is January, when snow falls for 1.6 days and typically aggregates up to 0.98" (25mm) of snow.
Throughout the year, there are 4.5 snowfall days, and 2.6" (66mm) of snow is accumulated.
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.
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.
In Marietta, snow does not fall in April through November.
May through August, with an average maximum UV index of 6, are months with the highest UV index.
With an average of 14h and 24min of daylight, June has the longest days of the year.
With average high and low temperatures of 90.5°F (32.5°C) and 71.4°F (21.9°C) respectively, July is Marietta's warmest month.
July has the most sunshine of the year, with an average of 10.6h of sunshine.
With an average relative humidity of 68%, August is the least humid month.
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.
October is the month with the least rainfall. Rain falls for 10.2 days and accumulates 2.24" (57mm) of precipitation.
December is the most humid month, with an average relative humidity of 78%.
The month with the shortest days is December, with an average of 9h and 54min of daylight.
With an average of 5h of sunshine, December has the least sunshine of the year in Marietta.
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).
Average pressure
Marietta, GA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.1"Hg - Average pressure in April:
30.02"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
29.99"Hg
- Average pressure in July:
30.01"Hg - Average pressure in August:
30"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.06"Hg - Average pressure in November:
30.15"Hg - Average pressure in December:
30.15"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed
Marietta, GA
- Average wind speed in January:
8.1mph - Average wind speed in February:
8mph - Average wind speed in March:
7.5mph - Average wind speed in April:
7.3mph - Average wind speed in May:
5.9mph - Average wind speed in June:
5.1mph
- Average wind speed in July:
4.7mph - Average wind speed in August:
4.7mph - Average wind speed in September:
5mph - Average wind speed in October:
6.2mph - Average wind speed in November:
6.8mph - Average wind speed in December:
7.5mph
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).
Average humidity
Marietta, GA
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is August (68%).
Average rainfall
Marietta, GA
- Average rainfall in January:
3.23" - Average rainfall in February:
3.58" - Average rainfall in March:
3.43" - Average rainfall in April:
3.43" - Average rainfall in May:
3.94" - Average rainfall in June:
3.46"
- Average rainfall in July:
4.17" - Average rainfall in August:
4.88" - Average rainfall in September:
2.76" - Average rainfall in October:
2.24" - Average rainfall in November:
3.03" - Average rainfall in December:
3.78"
The wettest month (with the highest rainfall) is August (4.88").
The driest month (with the least rainfall) is October (2.24").
Average rainfall days
Marietta, GA
- Average rainfall days in January:
12.3 days - Average rainfall days in February:
14.6 days - Average rainfall days in March:
15.4 days - Average rainfall days in April:
14.3 days - Average rainfall days in May:
17.6 days - Average rainfall days in June:
18.3 days
- Average rainfall days in July:
19.6 days - Average rainfall days in August:
18.8 days - Average rainfall days in September:
12.8 days - Average rainfall days in October:
10.2 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
13.7 days
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).
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").
Average snowfall days
Marietta, GA
- Average snowfall days in January:
1.6 days - Average snowfall days in February:
1.3 days - Average snowfall days in March:
0.6 days - Average snowfall days in April:
0.1 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.1 days - Average snowfall days in December:
0.8 days
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).
Average daylight / Average sunshine
Marietta, GA
- Average daylight in January:
10h and 12min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 6min - Average daylight in May:
13h and 54min - Average daylight in June:
14h and 24min
- Average daylight in July:
14h and 12min - Average daylight in August:
13h and 24min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 18min - Average daylight in November:
10h and 24min - Average daylight in December:
9h and 54min
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).
- Average sunshine in January:
5h and 36min - Average sunshine in February:
6h and 24min - Average sunshine in March:
6h and 48min - Average sunshine in April:
8h and 18min - Average sunshine in May:
9h and 42min - Average sunshine in June:
10h and 30min
- Average sunshine in July:
10h and 36min - Average sunshine in August:
9h and 18min - Average sunshine in September:
8h and 30min - Average sunshine in October:
7h and 6min - Average sunshine in November:
5h and 42min - Average sunshine in December:
5h and 0min
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).
Average sunshine days
Marietta, GA
- Average sunshine days in January:
16 days - Average sunshine days in February:
11.5 days - Average sunshine days in March:
13.5 days - Average sunshine days in April:
13.9 days - Average sunshine days in May:
12.1 days - Average sunshine days in June:
10.4 days
- Average sunshine days in July:
9.6 days - Average sunshine days in August:
9.9 days - Average sunshine days in September:
15.5 days - Average sunshine days in October:
20.1 days - Average sunshine days in November:
19.1 days - Average sunshine days in December:
15.7 days
The month with the most sunshine days is October (20.1 days).
The month with the least sunshine days is July (9.6 days).
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).
Average cloud cover
Marietta, GA
The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 31).
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).
