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Monthly climate in Mermentau, Louisiana, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Mermentau 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 -8 °C (17 °F) or can rise to as high as 39 °C (102 °F). The average annual precipitation amounts to about 1517 mm (59.7 inches) and receives 147 rainy days on the 1 mm (0.04 inches) threshold annually. Mermentau enjoys an average of 3164 hours of sunshine throughout the year, and daylight varies from 10 hours 13 minutes to 14 hours 3 minutes per day.

Monthly average temperatures in Mermentau, Louisiana, United States §

The warmest months in Mermentau 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, Mermentau experiences 201 days above 25 °C (77.0 °F) and 7 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Mermentau, Louisiana, 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 28°C
(82°F)		 28°C
(82°F)		 31°C
(87°F)		 33°C
(92°F)		 36°C
(97°F)		 35°C
(96°F)		 39°C
(102°F)		 37°C
(99°F)		 36°C
(97°F)		 36°C
(96°F)		 29°C
(85°F)		 28°C
(83°F)
Mean maximum 25°C
(77°F)		 27°C
(80°F)		 29°C
(85°F)		 31°C
(88°F)		 33°C
(93°F)		 34°C
(94°F)		 36°C
(97°F)		 36°C
(97°F)		 35°C
(95°F)		 33°C
(91°F)		 28°C
(83°F)		 26°C
(80°F)
Average high 17°C
(63°F)		 20°C
(68°F)		 24°C
(75°F)		 26°C
(79°F)		 30°C
(86°F)		 32°C
(89°F)		 32°C
(91°F)		 32°C
(91°F)		 31°C
(88°F)		 28°C
(82°F)		 22°C
(71°F)		 19°C
(67°F)
Daily mean 12°C
(54°F)		 15°C
(59°F)		 18°C
(65°F)		 20°C
(69°F)		 25°C
(77°F)		 27°C
(81°F)		 28°C
(83°F)		 28°C
(83°F)		 26°C
(80°F)		 22°C
(73°F)		 16°C
(61°F)		 14°C
(57°F)
Average low 7°C
(45°F)		 10°C
(50°F)		 13°C
(56°F)		 15°C
(59°F)		 20°C
(69°F)		 23°C
(74°F)		 24°C
(76°F)		 24°C
(76°F)		 22°C
(72°F)		 18°C
(64°F)		 10°C
(51°F)		 9°C
(48°F)
Mean minimum -3°C
(27°F)		 -0°C
(32°F)		 3°C
(38°F)		 6°C
(43°F)		 14°C
(57°F)		 20°C
(68°F)		 22°C
(71°F)		 21°C
(70°F)		 17°C
(63°F)		 8°C
(47°F)		 1°C
(34°F)		 -1°C
(31°F)
Minimum -8°C
(17°F)		 -8°C
(18°F)		 -1°C
(31°F)		 4°C
(39°F)		 11°C
(52°F)		 16°C
(62°F)		 20°C
(68°F)		 20°C
(69°F)		 14°C
(57°F)		 3°C
(38°F)		 -3°C
(26°F)		 -2°C
(28°F)

Compare climate in Mermentau with other places

Compare temperature, precipitation, sunshine, UV index in Mermentau, Louisiana, United States with other places around the world.

Monthly average precipitation in Mermentau, Louisiana, United States §

Mermentau usually has the most precipitation in May, July and August, with an average of 16 rainy days and 170 mm (6.7 inches) of precipitation per month. The driest months in Mermentau are February, March and November. On average, 84 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Mermentau, Louisiana, 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) 110 (4.3) 104 (4.1) 65 (2.6) 141 (5.6) 170 (6.7) 146 (5.7) 158 (6.2) 183 (7.2) 126 (5.0) 117 (4.6) 83 (3.3) 113 (4.5)
Average precipitation days (≥ 1 mm) 9 12 10 11 11 15 17 20 14 9 9 10

Monthly sunshine hours in Mermentau, Louisiana, United States §

The sunniest months in Mermentau are May, July and August, when the sun shines an average of 10 hours 10 minutes a day. Least sunny months in Mermentau: January, February and December receive an average of 6 hours 16 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Mermentau, Louisiana, 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 173 182 259 276 314 302 318 313 276 279 252 215
Mean daily daylight hours 10h 25m 11h 7m 12h 0m 12h 55m 13h 40m 14h 3m 13h 50m 13h 10m 12h 18m 11h 23m 10h 36m 10h 13m

Solar UV radiation in Mermentau, Louisiana, United States §

Mermentau experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 12 - 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 Mermentau UV Index data.

Average daily maximum UV levels by month for Mermentau, Louisiana, 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 12 12 12 10 9 6 5

Detailed Monthly Weather Insights for Mermentau, Louisiana, United States

Discover in-depth weather details for every month in Mermentau. 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 Mermentau'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.