Climate and monthly weather forecastBay Saint Louis, MS
Climate and monthly weather forecast
The climate of Bay Saint Louis
Located in the Southeastern United States, Bay Saint Louis, Mississippi falls under the Köppen Climate Classification system as Cfa. This classification denotes a humid subtropical climate, signifying no dry season. Geographically, Bay Saint Louis is positioned near the Gulf of Mexico, inheriting a climate considerably milder and more humid than areas further inland.Throughout the year, Bay Saint Louis experiences a range in temperature fluctuating from a lower average of 46.4°F (8°C) in the coldest month to a peak average of 89.2°F (31.8°C) during the hottest month. Consistent with a subtropical climate, it exhibits high humidity levels throughout the year with an average relative humidity ranging from 74% to 79%. Noticeably, relative humidity is slightly higher during the cooler months than the warmer months which can make the perceived temperature feel colder than the actual.
In terms of precipitation, rainfall is present in every month, with the most considerable rainfall of 2.2" (56mm) in August and the least, 0.51" (13mm), occurring in March. Though, snowfall is a rare phenomenon here. The sea temperature in this city varies from 56.8°F (13.8°C) during its coldest month to 86.5°F (30.3°C) in August, the warmest month.
The best time to visit Bay Saint Louis
Visitors seeking warm daytime temperatures coupled with limited rainfall may find the period from April through June as optimal for visiting Bay Saint Louis. During these months, temperatures usually soar to a comfortable range from 69.4°F (20.8°C) to 89.1°F (31.7°C) and rainfall averages from 0.59" (15mm) to 1.3" (33mm). The daylight hours are also extensive, which ensure outdoor exploration and beach activities a pleasure.The worst time to visit Bay Saint Louis
Visitors may want to avoid Bay Saint Louis in the late summer months, particularly from July to August. Temperatures tend to peak to the highest levels of the year, reaching an average of 89.1°F (31.7°C) to 89.2°F (31.8°C). Additionally, these months coincide with the highest levels of rainfall, 1.93" (49mm) and 2.2" (56mm) respectively, which can interrupt outdoor activities.Spring weather in Bay Saint Louis
Spring in Bay Saint Louis, spanning from March to May, brings a gradual rise in temperatures from an average low of 56.8°F (13.8°C) to a high of 81.7°F (27.6°C). Precipitation is moderate, with rainfall increasing from 0.51" (13mm) in March to nearly doubling at 0.98" (25mm) by May. Days begin to lengthen, with sunshine hours ranging from 7.9 hours in March to a spring peak of 10.8 hours in May, offering plenty of daylight for outdoor exploration.Summer weather in Bay Saint Louis
The summer months from June through August in Bay Saint Louis are marked by high heat and humidity with average high temperatures soaring to between 88°F (31.1°C) to 89.2°F (31.8°C). This period sees the most significant rainfall of the year, with values ranging from 1.3" (33mm) in June reaching the annual peak at 2.2" (56mm) in August. Daylight durations are longest during summer, and sea temperatures are warmest, hovering around 84.1°F (28.9°C) to 86.5°F (30.3°C), ideal for beach or water-based activities.Autumn weather in Bay Saint Louis
Autumn, from September to November, sees a dip in temperatures, a decrease in rainfall, and a reduction in daylight hours.Weather in January
As the year kicks off in Bay Saint Louis, Mississippi, the city experiences a winter season. However, it is quite mellow, with temperatures peaking at 58.8°F (14.9°C) and dropping to a low of 46.4°F (8°C). As compared to February, the city is slightly cooler and receives marginally more rainfall. Weather in January »Weather in February
February in Bay Saint Louis, Mississippi, sees subtle changes in weather conditions from January. The temperature begins to climb slowly, casting off the jackets of winter. The days start to become longer, enabling more outdoor activities. Weather in February »Weather in March
The advent of March signals the transition from winter to spring in Bay Saint Louis, Mississippi. Weather conditions tend to be quite pleasant, with an underlying coolness to the air. Although temperatures continue to rise, precipitation is still relatively high, making for a humid month. Weather in March »Weather in April
April exhibits a significant leap in temperatures in comparison to March in Bay Saint Louis, Mississippi. This sees the city firmly lodged in the spring season with abundant flora. The weather is characterized by longer, sunnier days along with an increase in daily sunlight hours. Weather in April »Weather in May
May indicates that Bay Saint Louis, Mississippi, is moving from spring to summer. Though warmer than April, May still maintains a comfortable climate, making for an agreeable mix of warmth and cool. The city experiences the highest annual relative humidity of 75%, bringing a sense of moisture to the air. Weather in May »Weather in June
June epitomizes the typical summer season in Bay Saint Louis, Mississippi. The sun is high, the days are long, and the weather is markedly warmer than May. It is characteristically humid, though not excessively so, and rainfall starts to intensify. Weather in June »Weather in July
Bay Saint Louis, Mississippi, bathes in peak summer heat during July. The city experiences high temperatures along with maximum days of rainfall, a drastic difference from the cooler, dry June. July is the year's most humid month, helping maintain the lush green landscapes the city is known for. Weather in July »Weather in August
As the latter part of the summer season, August in Bay Saint Louis, Mississippi, continues in the same vein as July, albeit slightly warmer and with increased rainfall. Mornings and evenings can be quite hot, making it crucial to stay hydrated. Weather in August »Weather in September
September in Bay Saint Louis, Mississippi, signifies the outset of autumn. The city sees a significant decrease in temperature and humidity from the preceding month. Still, residents and visitors continue to enjoy the long daylight hours and warm sea temperatures. Weather in September »Weather in October
October witnesses the progression of autumn in Bay Saint Louis, Mississippi, with temperatures continuing to drop from September. The weather becomes noticeably cooler, with rainfall scaling down and humidity levelling off. The first chill of the autumn season begins to be felt, especially during the shorter, darker evenings. Weather in October »Weather in November
November brings Bay Saint Louis, Mississippi, one step closer to winter, with temperatures dipping further down from October. The autumn chill is now prevalent, making it advisable to layer up in the evenings. The weather becomes increasingly volatile as the month progresses, with drizzles and cold winds becoming more frequent. Weather in November »Weather in December
Concluding the year, December in Bay Saint Louis, Mississippi, sees the introduction of winter once again. The city experiences shorter days and a notable downturn in temperatures from November. The cooler temperatures do not discourage outdoor activities, especially amidst Christmas festivities. Weather in December »Updated: Jul 28, 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 58.8°F (14.9°C) and lows at 46.4°F (8°C).
In Bay Saint Louis, during the entire year, the rain falls for 131.5 days and collects up to 12.01" (305mm) of precipitation.
The only month with snowfall is January.
January has the most snowfall days of the year. Snow falls for 0.1 days.
Throughout the year, in Bay Saint Louis, there are 0.1 snowfall days.
January is the month with the coldest seawater, with an average ocean temperature of 56.8°F (13.8°C).
January, November and December, with an average maximum UV index of 4, are months with the lowest UV index.
February through December are months without snowfall.
The month with the least rainfall is March, when the rain falls for 10.5 days and typically collects 0.51" (13mm) of precipitation.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
May through August, with an average maximum UV index of 7, are months with the highest UV index.
The month with the longest days is June, with an average of 14h and 6min of daylight.
With an average of 11.2h of sunshine, June has the most sunshine of the year.
August, known for its average high temperature of 89.2°F (31.8°C) and an average low temperature of 77.9°F (25.5°C), is the warmest month.
The month with the most rainfall is August, when the rain falls for 19.1 days and typically aggregates up to 2.2" (56mm) of precipitation.
With an average ocean temperature of 86.5°F (30.3°C), August is the month with the warmest seawater.
With an average relative humidity of 70%, October is the least humid month.
December is the most humid month, with an average relative humidity of 79%.
With an average of 10h and 12min of daylight, December has the shortest days of the year.
The month with the least sunshine is December, with an average of 5.3h of sunshine.
Average temperature
Bay Saint Louis, MS
The warmest month (with the highest average high temperature) is August (89.2°F).
The month with the lowest average high temperature is January (58.8°F).
The month with the highest average low temperature is August (77.9°F).
The coldest month (with the lowest average low temperature) is January (46.4°F).
Average pressure
Bay Saint Louis, MS
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
30"Hg - Average pressure in May:
30"Hg - Average pressure in June:
29.97"Hg
- Average pressure in July:
30"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
29.98"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June and August (29.97"Hg).
Average wind speed
Bay Saint Louis, MS
- Average wind speed in January:
8.8mph - Average wind speed in February:
8.8mph - Average wind speed in March:
8.7mph - Average wind speed in April:
8.9mph - Average wind speed in May:
7.6mph - Average wind speed in June:
6.8mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
6.2mph - Average wind speed in September:
6.5mph - Average wind speed in October:
7.9mph - Average wind speed in November:
8.5mph - Average wind speed in December:
8.6mph
The windiest month (with the highest average wind speed) is April (8.9mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity
Bay Saint Louis, MS
The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Bay Saint Louis, MS
- Average rainfall in January:
0.59" - Average rainfall in February:
0.55" - Average rainfall in March:
0.51" - Average rainfall in April:
0.59" - Average rainfall in May:
0.98" - Average rainfall in June:
1.3"
- Average rainfall in July:
1.93" - Average rainfall in August:
2.2" - Average rainfall in September:
0.83" - Average rainfall in October:
1.06" - Average rainfall in November:
0.55" - Average rainfall in December:
0.91"
The wettest month (with the highest rainfall) is August (2.2").
The driest month (with the least rainfall) is March (0.51").
Average rainfall days
Bay Saint Louis, MS
- Average rainfall days in January:
8 days - Average rainfall days in February:
7.9 days - Average rainfall days in March:
10.5 days - Average rainfall days in April:
7.5 days - Average rainfall days in May:
10.8 days - Average rainfall days in June:
13.9 days
- Average rainfall days in July:
17.3 days - Average rainfall days in August:
19.1 days - Average rainfall days in September:
15.4 days - Average rainfall days in October:
7.9 days - Average rainfall days in November:
4.9 days - Average rainfall days in December:
8.3 days
The month with the highest number of rainy days is August (19.1 days).
The month with the least rainy days is November (4.9 days).
Average snowfall days
Bay Saint Louis, MS
- Average snowfall days in January:
0.1 days - Average snowfall days in February:
0 days - Average snowfall days in March:
0 days - Average snowfall days in April:
0 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 days - Average snowfall days in December:
0 days
The month with the highest number of snowfall days is January (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).
Average sea temperature
Bay Saint Louis, MS
The best month for swimming (with the highest average sea temperature) is August (86.5°F).
The coldest month (with the lowest average sea temperature) is January (56.8°F).
Average daylight / Average sunshine
Bay Saint Louis, MS
- Average daylight in January:
10h and 30min - Average daylight in February:
11h and 6min - Average daylight in March:
12h and 0min - Average daylight in April:
12h and 54min - Average daylight in May:
13h and 42min - Average daylight in June:
14h and 6min
- Average daylight in July:
13h and 54min - Average daylight in August:
13h and 12min - Average daylight in September:
12h and 18min - Average daylight in October:
11h and 24min - Average daylight in November:
10h and 36min - Average daylight in December:
10h and 12min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in January:
5h and 42min - Average sunshine in February:
5h and 30min - Average sunshine in March:
7h and 54min - Average sunshine in April:
10h and 6min - Average sunshine in May:
10h and 48min - Average sunshine in June:
11h and 12min
- Average sunshine in July:
10h and 48min - Average sunshine in August:
10h and 54min - Average sunshine in September:
10h and 6min - Average sunshine in October:
7h and 48min - Average sunshine in November:
6h and 12min - Average sunshine in December:
5h and 18min
The month with the most sunshine is June (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days
Bay Saint Louis, MS
- Average sunshine days in January:
21.7 days - Average sunshine days in February:
18.3 days - Average sunshine days in March:
18.5 days - Average sunshine days in April:
20.6 days - Average sunshine days in May:
16.8 days - Average sunshine days in June:
11.3 days
- Average sunshine days in July:
8.3 days - Average sunshine days in August:
8 days - Average sunshine days in September:
11.1 days - Average sunshine days in October:
20 days - Average sunshine days in November:
23.3 days - Average sunshine days in December:
19.9 days
The month with the most sunshine days is November (23.3 days).
The month with the least sunshine days is August (8 days).
Average UV index
Bay Saint Louis, MS
The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 4).
Average cloud cover
Bay Saint Louis, MS
The month with the most cloud cover is December (Cloud cover 44).
The month with the least cloud cover is October (Cloud cover 23).
Average visibility
Bay Saint Louis, MS
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).
