Annual mean 20°C · wettest around July · prevailing wind SE
Warmest
31.6 °C
Coldest
14.2 °C
Wettest
57%
Windiest
4.3 m/s
Prevailing
SE
3.6 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 Bay St. Louis over the whole year is 20°C. August is the hottest month, with highs of about 30°C; January is the coldest, with lows of about 9°C. Bay St. Louis has no sharply defined rainy season: the chance of rain on a given day runs from 45% in October, the driest month, to 56% in July, the wettest. Winds in Bay St. Louis are highest in February, averaging 3.2 m/s (12 km/h), and lightest in July, at 1.9 m/s (7 km/h). The prevailing wind is from the SE. The clearest skies in Bay St. Louis come in September, when the sky is typically 23% covered; February is the cloudiest month, at 39%.
Month by month Bay St. Louis 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
9°C
12°C
52%
32%
3.0 m/s
35
4
62
February
18°C
12°C
16°C
53%
39%
3.2 m/s
51
12
62
March
21°C
15°C
20°C
52%
35%
3.2 m/s
64
24
56
April
23°C
17°C
22°C
48%
29%
3.1 m/s
73
33
49
May
27°C
21°C
29°C
52%
27%
2.7 m/s
33
62
11
June
30°C
24°C
33°C
55%
25%
2.4 m/s
5
41
1
July
27°C
22°C
30°C
56%
24%
1.9 m/s
3
25
0
August
30°C
24°C
34°C
53%
25%
2.0 m/s
2
25
0
September
30°C
23°C
32°C
49%
23%
2.2 m/s
13
46
5
October
26°C
18°C
26°C
45%
24%
2.6 m/s
46
54
26
November
20°C
13°C
19°C
50%
30%
2.6 m/s
60
21
59
December
16°C
11°C
15°C
53%
37%
2.7 m/s
44
8
63
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 Bay St. Louis weather by season
Year round, Bay St. Louis has days of about 14°C at their warmest in January, its coolest month, and 30°C in August, its warmest; the coolest hours of the day run from 9°C to 24°C through the year, and the average temperature over the year is 20°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.
Bay St. Louis weather in winterDecember to February
High 16°CLow 10°CRain 53%
Winter in Bay St. Louis has typical daily highs of about 16°C and lows of about 10°C, with a 53% chance of rain on a given day.
Bay St. Louis weather in springMarch to May
High 24°CLow 18°CRain 51%
Spring in Bay St. Louis has typical daily highs of about 24°C and lows of about 18°C, with a 51% chance of rain on a given day.
Bay St. Louis weather in summerJune to August
High 29°CLow 24°CRain 55%
Summer in Bay St. Louis has typical daily highs of about 29°C and lows of about 24°C, with a 55% chance of rain on a given day.
Bay St. Louis weather in autumnSeptember to November
High 25°CLow 18°CRain 48%
Autumn in Bay St. Louis has typical daily highs of about 25°C and lows of about 18°C, with a 48% chance of rain on a given day.
When is the rainy season in Bay St. Louis?
Bay St. Louis has no sharply defined rainy season: the chance of rain on a given day runs from 45% in October, the driest month, to 56% in July, the wettest.
What time of year is Bay St. Louis windiest?
Winds in Bay St. Louis are highest in February, averaging 3.2 m/s (12 km/h), and lightest in July, at 1.9 m/s (7 km/h). The prevailing wind is from the SE.
What is the average temperature in Bay St. Louis year round?
The average temperature in Bay St. Louis over the whole year is 20°C. August is the hottest month, with highs of about 30°C; January is the coldest, with lows of about 9°C.