Annual mean 13°C · wettest around May · prevailing wind SW
Warmest
28.6 °C
Coldest
1.3 °C
Wettest
19%
Windiest
4.3 m/s
Prevailing
SW
3.3 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Marietta over the whole year is 13°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -2°C. Marietta has no sharply defined rainy season: the chance of rain on a given day runs from 14% in September, the driest month, to 23% in May, the wettest. Winds in Marietta are highest in March, averaging 2.9 m/s (10 km/h), and lightest in August, at 1.4 m/s (5 km/h). The prevailing wind is from the SW. The clearest skies in Marietta come in July, when the sky is typically 38% covered; January is the cloudiest month, at 65%.
Month by month Marietta climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
2°C
-2°C
-2°C
19%
65%
2.6 m/s
2
0
13
February
6°C
1°C
1°C
22%
56%
2.8 m/s
6
0
27
March
11°C
3°C
7°C
21%
49%
2.9 m/s
19
0
47
April
16°C
8°C
13°C
21%
48%
2.7 m/s
42
5
64
May
22°C
14°C
20°C
23%
48%
2.0 m/s
64
28
55
June
26°C
18°C
26°C
19%
39%
1.9 m/s
58
52
28
July
28°C
21°C
30°C
19%
38%
1.5 m/s
27
68
6
August
28°C
19°C
29°C
16%
40%
1.4 m/s
41
65
13
September
25°C
15°C
25°C
14%
40%
1.4 m/s
63
48
38
October
19°C
9°C
17°C
17%
45%
1.7 m/s
54
15
68
November
11°C
4°C
7°C
15%
46%
2.2 m/s
18
1
48
December
6°C
1°C
1°C
19%
58%
2.4 m/s
3
0
24
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Marietta weather by season
Year round, Marietta has days of about 2°C at their warmest in January, its coolest month, and 28°C in July, its warmest; the coolest hours of the day run from -2°C to 21°C through the year, and the average temperature over the year is 13°C around the clock. Rain is most likely around May and least likely around September. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Marietta weather in winterDecember to February
High 5°CLow -0°CRain 20%
Winter in Marietta has typical daily highs of about 5°C and lows of about -0°C, with a 20% chance of rain on a given day.
Marietta weather in springMarch to May
High 16°CLow 8°CRain 21%
Spring in Marietta has typical daily highs of about 16°C and lows of about 8°C, with a 21% chance of rain on a given day.
Marietta weather in summerJune to August
High 27°CLow 19°CRain 18%
Summer in Marietta has typical daily highs of about 27°C and lows of about 19°C, with a 18% chance of rain on a given day.
Marietta weather in autumnSeptember to November
High 18°CLow 9°CRain 15%
Autumn in Marietta has typical daily highs of about 18°C and lows of about 9°C, with a 15% chance of rain on a given day.
When is the rainy season in Marietta?
Marietta has no sharply defined rainy season: the chance of rain on a given day runs from 14% in September, the driest month, to 23% in May, the wettest.
What time of year is Marietta windiest?
Winds in Marietta are highest in March, averaging 2.9 m/s (10 km/h), and lightest in August, at 1.4 m/s (5 km/h). The prevailing wind is from the SW.
What is the average temperature in Marietta year round?
The average temperature in Marietta over the whole year is 13°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -2°C.