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Monthly climate in Bay Saint Louis, Mississippi, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Bay Saint Louis features a humid subtropical climate (Cfa). Temperatures typically range between 12 °C (54 °F) and 28 °C (83 °F) through the year, but rarely can drop to -3 °C (26 °F) or can rise to as high as 33 °C (91 °F). The average annual precipitation amounts to about 1767 mm (69.6 inches) and receives 159 rainy days on the 1 mm (0.04 inches) threshold annually. Bay Saint Louis enjoys an average of 3261 hours of sunshine throughout the year, and daylight varies from 10 hours 12 minutes to 14 hours 3 minutes per day.

Monthly average temperatures in Bay Saint Louis, Mississippi, United States §

The warmest months in Bay Saint Louis are June, July and August, with daily mean temperatures ranging from 27 to 28 °C (81 - 83 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 12 to 15 °C (54 - 59 °F) throughout the day. On average each year, Bay Saint Louis experiences 138 days above 25 °C (77.0 °F) and 1 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Bay Saint Louis, Mississippi, United States. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 23°C
(74°F)		 23°C
(74°F)		 26°C
(79°F)		 26°C
(80°F)		 29°C
(85°F)		 31°C
(89°F)		 33°C
(91°F)		 33°C
(91°F)		 33°C
(91°F)		 30°C
(87°F)		 25°C
(77°F)		 22°C
(72°F)
Mean maximum 20°C
(68°F)		 20°C
(69°F)		 23°C
(75°F)		 25°C
(77°F)		 28°C
(83°F)		 30°C
(86°F)		 32°C
(90°F)		 32°C
(89°F)		 31°C
(88°F)		 29°C
(84°F)		 24°C
(75°F)		 21°C
(69°F)
Average high 14°C
(58°F)		 16°C
(62°F)		 19°C
(67°F)		 22°C
(72°F)		 26°C
(79°F)		 28°C
(83°F)		 29°C
(85°F)		 29°C
(85°F)		 28°C
(83°F)		 25°C
(78°F)		 19°C
(67°F)		 16°C
(61°F)
Daily mean 12°C
(54°F)		 15°C
(59°F)		 18°C
(64°F)		 20°C
(69°F)		 24°C
(76°F)		 27°C
(81°F)		 28°C
(82°F)		 28°C
(83°F)		 27°C
(80°F)		 23°C
(75°F)		 17°C
(63°F)		 14°C
(58°F)
Average low 10°C
(50°F)		 13°C
(55°F)		 16°C
(61°F)		 18°C
(65°F)		 23°C
(73°F)		 26°C
(78°F)		 27°C
(80°F)		 27°C
(80°F)		 25°C
(78°F)		 22°C
(71°F)		 15°C
(59°F)		 12°C
(54°F)
Mean minimum 1°C
(35°F)		 5°C
(41°F)		 7°C
(44°F)		 11°C
(52°F)		 18°C
(65°F)		 23°C
(74°F)		 24°C
(76°F)		 24°C
(76°F)		 21°C
(71°F)		 14°C
(57°F)		 7°C
(46°F)		 5°C
(42°F)
Minimum -3°C
(26°F)		 -2°C
(29°F)		 3°C
(37°F)		 9°C
(48°F)		 15°C
(58°F)		 22°C
(72°F)		 24°C
(75°F)		 24°C
(75°F)		 18°C
(65°F)		 9°C
(49°F)		 2°C
(36°F)		 4°C
(39°F)

Compare climate in Bay Saint Louis with other places

Compare temperature, precipitation, sunshine, UV index in Bay Saint Louis, Mississippi, United States with other places around the world.

Monthly average precipitation in Bay Saint Louis, Mississippi, United States §

Bay Saint Louis usually has the most precipitation in June, July and August, with an average of 19 rainy days and 240 mm (9.4 inches) of precipitation per month. The driest months in Bay Saint Louis are January, March and November. On average, 85 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Bay Saint Louis, Mississippi, United States. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 107 (4.2) 122 (4.8) 89 (3.5) 126 (4.9) 138 (5.4) 279 (11.0) 200 (7.9) 239 (9.4) 155 (6.1) 133 (5.2) 59 (2.3) 120 (4.7)
Average precipitation days (≥ 1 mm) 10 13 11 9 12 19 20 20 14 12 7 12

Monthly sunshine hours in Bay Saint Louis, Mississippi, United States §

The sunniest months in Bay Saint Louis are May, July and August, when the sun shines an average of 10 hours 15 minutes a day. Least sunny months in Bay Saint Louis: January, February and December receive an average of 6 hours 41 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Bay Saint Louis, Mississippi, United States. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 180 205 276 288 322 298 318 312 283 289 263 223
Mean daily daylight hours 10h 25m 11h 6m 12h 0m 12h 55m 13h 41m 14h 3m 13h 51m 13h 10m 12h 18m 11h 23m 10h 36m 10h 12m

Solar UV radiation in Bay Saint Louis, Mississippi, United States §

Bay Saint Louis experiences the highest level of ultraviolet (UV) radiation in April, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme category of sun exposure. January, November and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Bay Saint Louis UV Index data.

Average daily maximum UV levels by month for Bay Saint Louis, Mississippi, United States. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 5 8 9 11 11 11 12 11 10 8 6 4

Detailed Monthly Weather Insights for Bay Saint Louis, Mississippi, United States

Discover in-depth weather details for every month in Bay Saint Louis. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Bay Saint Louis's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.