Climate and monthly weather forecastMermentau, LA
Climate and monthly weather forecast
Weather in January
January, the same as December, in Mermentau, Louisiana, is a moderate winter month, with an average temperature varying between 44.2°F (6.8°C) and 59°F (15°C). January, having an average high-temperature of 59°F (15°C) and an average low-temperature of 44.2°F (6.8°C), is the coldest month. Weather in January »Weather in February
The last month of the winter, February, is an enjoyable month in Mermentau, Louisiana, with an average temperature varying between 64°F (17.8°C) and 49.3°F (9.6°C). Mermentau starts February with an average high-temperature of a comfortable 64°F (17.8°C), a minor shift from January's 59°F (15°C). Weather in February »Weather in March
March, the first month of the spring in Mermentau, is an agreeable month, with an average temperature fluctuating between 54.3°F (12.4°C) and 70.9°F (21.6°C). As March sets, the average high-temperature shows a slight increase, moving up from a refreshing 64°F (17.8°C) in February to an agreeable 70.9°F (21.6°C). Weather in March »Weather in April
April in Mermentau, Louisiana, is a warm spring month, with an average temperature ranging between max 77.5°F (25.3°C) and min 60.4°F (15.8°C). April introduces a minor temperature shift, with average high-temperatures adjusting from March's agreeable 70.9°F (21.6°C) to a warm 77.5°F (25.3°C). Weather in April »Weather in May
The last month of the spring, May, is also a moderately hot month in Mermentau, Louisiana, with an average temperature ranging between max 84.6°F (29.2°C) and min 68.2°F (20.1°C). The beginning of May marks a minor shift in the average high-temperature, moving from April's moderately hot 77.5°F (25.3°C) to a still warm 84.6°F (29.2°C). Weather in May »Weather in June
The first month of the summer, June, is a tropical month in Mermentau, Louisiana, with an average temperature fluctuating between 89.2°F (31.8°C) and 73.4°F (23°C). In June, Mermentau's weather conditions record an average high-temperature of a tropical 89.2°F (31.8°C), demonstrating little divergence from the preceding month. Weather in June »Weather in July
July, like June, is another tropical summer month in Mermentau, Louisiana, with an average temperature fluctuating between 75.2°F (24°C) and 89.8°F (32.1°C). Mermentau's shift into July sets the average high-temperature at a still hot 89.8°F (32.1°C), a figure that deviates only slightly from June's 89.2°F (31.8°C). Weather in July »Weather in August
The last month of the summer, August, is also a hot month in Mermentau, Louisiana, with an average temperature varying between 90°F (32.2°C) and 75.2°F (24°C). In Mermentau, the peak average temperatures are observed in August, with a high of 90°F (32.2°C) and a low of 75.2°F (24°C). Throughout August, the heat index is appraised at a life-threatening hot 113°F (45°C). Weather in August »Weather in September
The first month of the autumn, September, is still a hot month in Mermentau, Louisiana, with temperature in the range of an average high of 86.7°F (30.4°C) and an average low of 70.9°F (21.6°C). The arrival of September records an average high-temperature of a still tropical 86.7°F (30.4°C), closely related to the 90°F (32.2°C) observed in August. Weather in September »Weather in October
October, like September, in Mermentau, Louisiana, is another warm autumn month, with temperature in the range of an average high of 79.5°F (26.4°C) and an average low of 61.5°F (16.4°C). In October, the average high-temperature marginally drops from a tropical 86.7°F (30.4°C) in September to a warm 79.5°F (26.4°C). Weather in October »Weather in November
November, the last month of the autumn in Mermentau, is another pleasant month, with an average temperature ranging between max 68.2°F (20.1°C) and min 52.2°F (11.2°C). With the onset of November, Mermentau's average high-temperature adjusts, receding from October's moderately hot 79.5°F (26.4°C) to an agreeable 68.2°F (20.1°C). Weather in November »Weather in December
December, the first month of the winter in Mermentau, is still a comfortable month, with an average temperature ranging between min 47.8°F (8.8°C) and max 61.5°F (16.4°C). Mermentau observes a small decrease in the average high-temperature with the arrival of December, falling from November's pleasant 68.2°F (20.1°C) to an enjoyable 61.5°F (16.4°C). Weather in December »Updated: Jul 22, 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
Mermentau notes the coldest temperatures in January, with a average high of 59°F (15°C) and a low of 44.2°F (6.8°C).
In Mermentau, during the entire year, the rain falls for 156.6 days and collects up to 26.34" (669mm) of precipitation.
The only month with snowfall is January.
January is the month with the most snowfall. Snow falls for 0.3 days and accumulates 0.12" (3mm) of snow.
Throughout the year, there are 0.3 snowfall days, and 0.12" (3mm) of snow is accumulated.
With an average relative humidity of 81%, February is the most humid month.
February is the month with the least rainfall. Rain falls for 10.7 days and accumulates 1.61" (41mm) of precipitation.
In Mermentau, snow does not fall in February through December.
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.
The months with the highest UV index are May through August, with an average maximum UV index of 7.
The month with the longest days is June, with an average of 14h and 6min of daylight.
June has the most sunshine of the year, with an average of 10.6h of sunshine.
Mermentau records the warmest temperatures in August, averaging a high of 90°F (32.2°C) and a low of 75.2°F (24°C).
August is the month with the most rainfall. Rain falls for 18.6 days and accumulates 3.58" (91mm) of precipitation.
The least humid month in Mermentau is October, with an average relative humidity of 72%.
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 5.1h of sunshine.
With an average maximum UV index of 3, December is the month with the lowest UV index.
Average temperature
Mermentau, LA
The warmest month (with the highest average high temperature) is August (90°F).
The month with the lowest average high temperature is January (59°F).
The months with the highest average low temperature are July and August (75.2°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).
Average pressure
Mermentau, LA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
29.97"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.95"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed
Mermentau, LA
- Average wind speed in January:
8.7mph - Average wind speed in February:
9.2mph - Average wind speed in March:
8.8mph - Average wind speed in April:
9.1mph - Average wind speed in May:
7.9mph - Average wind speed in June:
6.6mph
- Average wind speed in July:
5.9mph - Average wind speed in August:
5.8mph - Average wind speed in September:
6mph - Average wind speed in October:
7.2mph - Average wind speed in November:
8mph - Average wind speed in December:
8.6mph
The windiest month (with the highest average wind speed) is February (9.2mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity
Mermentau, LA
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Mermentau, LA
- Average rainfall in January:
2.32" - Average rainfall in February:
1.61" - Average rainfall in March:
1.81" - Average rainfall in April:
1.97" - Average rainfall in May:
2.01" - Average rainfall in June:
2.09"
- Average rainfall in July:
2.64" - Average rainfall in August:
3.58" - Average rainfall in September:
1.77" - Average rainfall in October:
2.52" - Average rainfall in November:
1.93" - Average rainfall in December:
2.09"
The wettest month (with the highest rainfall) is August (3.58").
The driest month (with the least rainfall) is February (1.61").
Average rainfall days
Mermentau, LA
- Average rainfall days in January:
10.4 days - Average rainfall days in February:
10.7 days - Average rainfall days in March:
13.1 days - Average rainfall days in April:
12.3 days - Average rainfall days in May:
12.1 days - Average rainfall days in June:
15.4 days
- Average rainfall days in July:
17.1 days - Average rainfall days in August:
18.6 days - Average rainfall days in September:
14.9 days - Average rainfall days in October:
10.3 days - Average rainfall days in November:
9.3 days - Average rainfall days in December:
12.4 days
The month with the highest number of rainy days is August (18.6 days).
The month with the least rainy days is November (9.3 days).
Average snowfall
Mermentau, LA
The month with the highest snowfall is January (0.12").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days
Mermentau, LA
- Average snowfall days in January:
0.3 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 (0.3 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight / Average sunshine
Mermentau, LA
- 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 30min - Average sunshine in February:
5h and 36min - Average sunshine in March:
7h and 18min - Average sunshine in April:
9h and 24min - Average sunshine in May:
10h and 18min - Average sunshine in June:
10h and 36min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
10h and 24min - Average sunshine in September:
9h and 54min - Average sunshine in October:
6h and 36min - Average sunshine in November:
5h and 54min - Average sunshine in December:
5h and 6min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days
Mermentau, LA
- Average sunshine days in January:
19 days - Average sunshine days in February:
15 days - Average sunshine days in March:
16.3 days - Average sunshine days in April:
15.5 days - Average sunshine days in May:
16 days - Average sunshine days in June:
11.8 days
- Average sunshine days in July:
11.2 days - Average sunshine days in August:
9.9 days - Average sunshine days in September:
12.5 days - Average sunshine days in October:
19 days - Average sunshine days in November:
19.3 days - Average sunshine days in December:
16.5 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is August (9.9 days).
Average UV index
Mermentau, LA
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover
Mermentau, LA
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is October (Cloud cover 25).
Average visibility
Mermentau, LA
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).
