Annual mean 21°C · wettest around August · prevailing wind E
Warmest
31.8 °C
Coldest
15.5 °C
Wettest
31%
Windiest
4.7 m/s
Prevailing
E
4.1 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 St. Marys over the whole year is 21°C. July is the hottest month, with highs of about 32°C; January is the coldest, with lows of about 10°C. St. Marys has no sharply defined rainy season: the chance of rain on a given day runs from 23% in October, the driest month, to 29% in August, the wettest. Winds in St. Marys are highest in April, averaging 3.3 m/s (12 km/h), and lightest in July, at 2.6 m/s (9 km/h). The prevailing wind is from the E. The clearest skies in St. Marys come in July, when the sky is typically 34% covered; November is the cloudiest month, at 49%.
Month by month St. Marys 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
16°C
10°C
13°C
26%
41%
2.9 m/s
39
7
66
February
19°C
13°C
17°C
24%
46%
3.0 m/s
59
15
64
March
21°C
14°C
19°C
24%
38%
3.2 m/s
67
21
61
April
24°C
17°C
23°C
25%
35%
3.3 m/s
74
37
46
May
28°C
22°C
28°C
26%
35%
3.1 m/s
41
63
15
June
30°C
25°C
32°C
27%
39%
3.0 m/s
10
52
2
July
32°C
26°C
35°C
27%
34%
2.6 m/s
3
28
0
August
31°C
25°C
34°C
29%
39%
2.6 m/s
3
34
0
September
29°C
24°C
31°C
27%
45%
3.0 m/s
17
56
4
October
26°C
20°C
26°C
23%
44%
3.1 m/s
54
52
27
November
21°C
15°C
20°C
24%
49%
3.0 m/s
65
22
61
December
18°C
12°C
16°C
26%
48%
2.9 m/s
53
11
68
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 St. Marys weather by season
Year round, St. Marys has days of about 16°C at their warmest in January, its coolest month, and 32°C in July, its warmest; the coolest hours of the day run from 10°C to 26°C through the year, and the average temperature over the year is 21°C around the clock. Rain is most likely around August 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.
St. Marys weather in winterDecember to February
High 18°CLow 11°CRain 25%
Winter in St. Marys has typical daily highs of about 18°C and lows of about 11°C, with a 25% chance of rain on a given day.
St. Marys weather in springMarch to May
High 25°CLow 18°CRain 25%
Spring in St. Marys has typical daily highs of about 25°C and lows of about 18°C, with a 25% chance of rain on a given day.
St. Marys weather in summerJune to August
High 31°CLow 25°CRain 28%
Summer in St. Marys has typical daily highs of about 31°C and lows of about 25°C, with a 28% chance of rain on a given day.
St. Marys weather in autumnSeptember to November
High 25°CLow 20°CRain 25%
Autumn in St. Marys has typical daily highs of about 25°C and lows of about 20°C, with a 25% chance of rain on a given day.
When is the rainy season in St. Marys?
St. Marys has no sharply defined rainy season: the chance of rain on a given day runs from 23% in October, the driest month, to 29% in August, the wettest.
What time of year is St. Marys windiest?
Winds in St. Marys are highest in April, averaging 3.3 m/s (12 km/h), and lightest in July, at 2.6 m/s (9 km/h). The prevailing wind is from the E.
What is the average temperature in St. Marys year round?
The average temperature in St. Marys over the whole year is 21°C. July is the hottest month, with highs of about 32°C; January is the coldest, with lows of about 10°C.