Annual mean 22°C · wettest around July · prevailing wind NE
Warmest
31.0 °C
Coldest
13.8 °C
Wettest
31%
Windiest
5.2 m/s
Prevailing
NE
4.3 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
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 Gretna over the whole year is 22°C. August is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 10°C. Gretna has no sharply defined rainy season: the chance of rain on a given day runs from 19% in October, the driest month, to 29% in July, the wettest. Winds in Gretna are highest in March, averaging 4.5 m/s (16 km/h), and lightest in July, at 2.9 m/s (10 km/h). The prevailing wind is from the NE. The clearest skies in Gretna come in August, when the sky is typically 27% covered; February is the cloudiest month, at 50%.
Month by month Gretna 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
14°C
10°C
11°C
25%
47%
4.4 m/s
32
2
60
February
18°C
14°C
15°C
23%
50%
4.4 m/s
54
11
62
March
21°C
17°C
19°C
23%
44%
4.5 m/s
67
18
62
April
24°C
19°C
22°C
23%
40%
4.4 m/s
75
33
49
May
28°C
23°C
28°C
25%
35%
3.6 m/s
36
66
12
June
30°C
27°C
33°C
28%
31%
3.4 m/s
7
45
1
July
30°C
27°C
34°C
29%
28%
2.9 m/s
5
28
1
August
31°C
27°C
34°C
27%
27%
3.0 m/s
4
29
0
September
29°C
25°C
32°C
22%
27%
3.3 m/s
13
49
5
October
26°C
21°C
26°C
19%
29%
3.8 m/s
48
56
26
November
20°C
16°C
19°C
21%
37%
4.0 m/s
60
19
62
December
16°C
13°C
14°C
26%
50%
4.0 m/s
45
8
62
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 Gretna weather by season
Year round, Gretna has days of about 14°C at their warmest in January, its coolest month, and 31°C in August, its warmest; the coolest hours of the day run from 10°C to 27°C through the year, and the average temperature over the year is 22°C around the clock. Rain is most likely around July and least likely around October. 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.
Gretna weather in winterDecember to February
High 16°CLow 12°CRain 25%
Winter in Gretna has typical daily highs of about 16°C and lows of about 12°C, with a 25% chance of rain on a given day.
Gretna weather in springMarch to May
High 24°CLow 20°CRain 24%
Spring in Gretna has typical daily highs of about 24°C and lows of about 20°C, with a 24% chance of rain on a given day.
Gretna weather in summerJune to August
High 30°CLow 27°CRain 28%
Summer in Gretna has typical daily highs of about 30°C and lows of about 27°C, with a 28% chance of rain on a given day.
Gretna weather in autumnSeptember to November
High 25°CLow 21°CRain 20%
Autumn in Gretna has typical daily highs of about 25°C and lows of about 21°C, with a 20% chance of rain on a given day.
When is the rainy season in Gretna?
Gretna has no sharply defined rainy season: the chance of rain on a given day runs from 19% in October, the driest month, to 29% in July, the wettest.
What time of year is Gretna windiest?
Winds in Gretna are highest in March, averaging 4.5 m/s (16 km/h), and lightest in July, at 2.9 m/s (10 km/h). The prevailing wind is from the NE.
What is the average temperature in Gretna year round?
The average temperature in Gretna over the whole year is 22°C. August is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 10°C.