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Current weather in Mermentau is broken clouds.

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Is the weather forecast for Mermentau updated regularly?

Weather data for Mermentau is updated regularly with the latest available observations and forecasts.

Now · 1:57 PM

Mermentau Weather & Hourly Forecast

United States · Louisiana · 70556

91°F

Mostly cloudy

Feels like: 97°F

💧 Humidity 49% 🌡 Pressure 29.94 inHg 💨 Wind 6 mph 👁 Visibility 6.2 mi ☁ Clouds 83% ☀️ UV index 9.9 · Very high 🌅 Sunrise 6:49 AM 🌇 Sunset 7:30 PM

Hourly Forecast for Mermentau

Today

2:00 PM

Mostly cloudy

91° 💧 None 💨 6 mph H 49%29.94 inHg

5:00 PM

Light rain

84° 💧 0.05 in 💨 10 mph H 56%29.91 inHg

8:00 PM

Light rain

78° 💧 0.04 in 💨 3 mph H 82%29.91 inHg

11:00 PM

Partly cloudy night

75° 💧 None 💨 2 mph H 89%29.91 inHg

Tomorrow

2:00 AM

Overcast night

76° 💧 None 💨 4 mph H 90%29.88 inHg

5:00 AM

Overcast night

76° 💧 0.02 in 💨 1 mph H 92%29.88 inHg

8:00 AM

Moderate rain

79° 💧 0.27 in 💨 4 mph H 93%29.94 inHg

11:00 AM

Moderate rain

87° 💧 0.05 in 💨 4 mph H 70%29.94 inHg

2:00 PM

Mostly cloudy

91° 💧 0.08 in 💨 2 mph H 53%29.91 inHg

5:00 PM

Light rain

84° 💧 0.06 in 💨 5 mph H 62%29.85 inHg

8:00 PM

Clear night

79° 💧 None 💨 6 mph H 83%29.85 inHg

11:00 PM

Mostly cloudy night

75° 💧 None 💨 4 mph H 84%29.88 inHg

Sunday

2:00 AM

Clear night

76° 💧 None 💨 4 mph H 88%29.88 inHg

5:00 AM

Mostly cloudy night

75° 💧 None 💨 3 mph H 89%29.88 inHg

8:00 AM

Partly cloudy

78° 💧 None 💨 3 mph H 84%29.91 inHg

11:00 AM

Partly cloudy

88° 💧 None 💨 4 mph H 61%29.94 inHg

Today

2:00 PM

Mostly cloudy

91° 💧 None 💨 6 mph H 49%29.94 inHg

3:00 PM

Mostly cloudy

90° 💧 None 💨 6 mph H 51%29.94 inHg

4:00 PM

Mostly cloudy

87° 💧 None 💨 9 mph H 51%29.91 inHg

5:00 PM

Light rain

84° 💧 0.01 in 💨 10 mph H 56%29.91 inHg

6:00 PM

Light rain

81° 💧 0.01 in 💨 8 mph H 63%29.88 inHg

7:00 PM

Light rain

78° 💧 0.04 in 💨 6 mph H 76%29.88 inHg

8:00 PM

Light rain

78° 💧 0.02 in 💨 3 mph H 82%29.91 inHg

9:00 PM

Light rain

76° 💧 0.01 in 💨 3 mph H 84%29.91 inHg

10:00 PM

Partly cloudy night

76° 💧 None 💨 2 mph H 87%29.94 inHg

11:00 PM

Partly cloudy night

75° 💧 None 💨 2 mph H 89%29.91 inHg

Tomorrow

12:00 AM

Mostly cloudy night

76° 💧 None 💨 3 mph H 90%29.91 inHg

1:00 AM

Mostly cloudy night

76° 💧 None 💨 2 mph H 90%29.88 inHg

2:00 AM

Overcast night

76° 💧 None 💨 4 mph H 90%29.88 inHg

3:00 AM

Overcast night

75° 💧 None 💨 3 mph H 91%29.88 inHg

4:00 AM

Overcast night

76° 💧 None 💨 2 mph H 92%29.88 inHg

5:00 AM

Overcast night

76° 💧 None 💨 1 mph H 92%29.88 inHg

6:00 AM

Overcast night

76° 💧 None 💨 2 mph H 91%29.91 inHg

7:00 AM

Light rain

76° 💧 0.02 in 💨 4 mph H 92%29.91 inHg

8:00 AM

Moderate rain

79° 💧 0.15 in 💨 4 mph H 93%29.94 inHg

9:00 AM

Moderate rain

82° 💧 0.04 in 💨 6 mph H 87%29.94 inHg

10:00 AM

Moderate rain

84° 💧 0.08 in 💨 6 mph H 80%29.94 inHg

11:00 AM

Moderate rain

87° 💧 0.05 in 💨 4 mph H 70%29.94 inHg

12:00 PM

Partly cloudy

89° 💧 None 💨 3 mph H 59%29.94 inHg

1:00 PM

Partly cloudy

88° 💧 None 💨 2 mph H 54%29.91 inHg

2:00 PM

Mostly cloudy

91° 💧 None 💨 2 mph H 53%29.91 inHg

3:00 PM

Light rain

87° 💧 0.03 in 💨 4 mph H 58%29.88 inHg

4:00 PM

Moderate rain

85° 💧 0.04 in 💨 5 mph H 65%29.88 inHg

5:00 PM

Light rain

84° 💧 0.01 in 💨 5 mph H 62%29.85 inHg

6:00 PM

Light rain

84° 💧 0.03 in 💨 5 mph H 70%29.85 inHg

7:00 PM

Light rain

82° 💧 0.02 in 💨 5 mph H 78%29.88 inHg

8:00 PM

Clear night

79° 💧 None 💨 6 mph H 83%29.85 inHg

9:00 PM

Mostly clear night

76° 💧 None 💨 5 mph H 83%29.88 inHg

10:00 PM

Partly cloudy night

75° 💧 None 💨 4 mph H 84%29.88 inHg

11:00 PM

Mostly cloudy night

75° 💧 None 💨 4 mph H 84%29.88 inHg

Sunday

12:00 AM

Partly cloudy night

77° 💧 None 💨 3 mph H 85%29.88 inHg

1:00 AM

Partly cloudy night

76° 💧 None 💨 4 mph H 86%29.88 inHg

2:00 AM

Clear night

76° 💧 None 💨 4 mph H 88%29.88 inHg

3:00 AM

Partly cloudy night

76° 💧 None 💨 3 mph H 88%29.88 inHg

4:00 AM

Mostly cloudy night

75° 💧 None 💨 3 mph H 88%29.88 inHg

5:00 AM

Mostly cloudy night

75° 💧 None 💨 3 mph H 89%29.88 inHg

6:00 AM

Mostly cloudy night

75° 💧 None 💨 2 mph H 89%29.91 inHg

7:00 AM

Mostly cloudy

75° 💧 None 💨 3 mph H 89%29.91 inHg

8:00 AM

Partly cloudy

78° 💧 None 💨 3 mph H 84%29.91 inHg

9:00 AM

Mostly cloudy

81° 💧 None 💨 4 mph H 77%29.94 inHg

10:00 AM

Mostly cloudy

85° 💧 None 💨 4 mph H 69%29.94 inHg

11:00 AM

Partly cloudy

88° 💧 None 💨 4 mph H 61%29.94 inHg

12:00 PM

Partly cloudy

91° 💧 None 💨 2 mph H 56%29.94 inHg

1:00 PM

Partly cloudy

93° 💧 None 💨 2 mph H 52%29.91 inHg

2:00 PM

Partly cloudy

94° 💧 None 💨 1 mph H 49%29.88 inHg

3:00 PM

Partly cloudy

94° 💧 None 💨 3 mph H 50%29.88 inHg

4:00 PM

Partly cloudy

92° 💧 None 💨 6 mph H 54%29.85 inHg

5:00 PM

Mostly cloudy

89° 💧 None 💨 9 mph H 59%29.85 inHg

6:00 PM

Mostly cloudy

87° 💧 None 💨 7 mph H 66%29.85 inHg

7:00 PM

Mostly cloudy

86° 💧 None 💨 6 mph H 68%29.85 inHg

8:00 PM

Clear night

83° 💧 None 💨 7 mph H 72%29.85 inHg

9:00 PM

Clear night

81° 💧 None 💨 7 mph H 78%29.88 inHg

10:00 PM

Clear night

79° 💧 None 💨 7 mph H 84%29.88 inHg

11:00 PM

Clear night

79° 💧 None 💨 6 mph H 85%29.88 inHg

Monday

12:00 AM

Light rain

78° 💧 0.00 in 💨 5 mph H 86%29.88 inHg

1:00 AM

Clear night

78° 💧 None 💨 6 mph H 87%29.88 inHg

2:00 AM

Mostly clear night

77° 💧 None 💨 5 mph H 88%29.88 inHg

3:00 AM

Partly cloudy night

77° 💧 None 💨 6 mph H 88%29.88 inHg

4:00 AM

Mostly cloudy night

77° 💧 None 💨 5 mph H 89%29.88 inHg

5:00 AM

Mostly cloudy night

76° 💧 None 💨 5 mph H 90%29.88 inHg

6:00 AM

Mostly cloudy night

76° 💧 None 💨 5 mph H 91%29.91 inHg

7:00 AM

Mostly cloudy

76° 💧 None 💨 5 mph H 91%29.91 inHg

8:00 AM

Partly cloudy

79° 💧 None 💨 4 mph H 85%29.94 inHg

9:00 AM

Partly cloudy

83° 💧 None 💨 5 mph H 75%29.94 inHg

10:00 AM

Partly cloudy

86° 💧 None 💨 5 mph H 67%29.97 inHg

11:00 AM

Partly cloudy

89° 💧 None 💨 5 mph H 60%29.97 inHg

12:00 PM

Partly cloudy

92° 💧 None 💨 4 mph H 54%29.97 inHg

1:00 PM

Mostly sunny

95° 💧 None 💨 3 mph H 49%29.94 inHg

2:00 PM

Mostly sunny

97° 💧 None 💨 2 mph H 46%29.91 inHg

3:00 PM

Partly cloudy

98° 💧 None 💨 1 mph H 42%29.88 inHg

4:00 PM

Partly cloudy

98° 💧 None 💨 2 mph H 41%29.85 inHg

5:00 PM

Partly cloudy

96° 💧 None 💨 5 mph H 44%29.85 inHg

6:00 PM

Partly cloudy

92° 💧 None 💨 9 mph H 54%29.88 inHg

7:00 PM

Partly cloudy

85° 💧 None 💨 12 mph H 73%29.88 inHg

8:00 PM

Clear night

83° 💧 None 💨 11 mph H 76%29.88 inHg

9:00 PM

Clear night

81° 💧 None 💨 5 mph H 81%29.94 inHg

10:00 PM

Light rain

80° 💧 0.01 in 💨 7 mph H 84%29.94 inHg

11:00 PM

Light rain

79° 💧 0.02 in 💨 3 mph H 87%29.94 inHg

Tuesday

12:00 AM

Partly cloudy night

78° 💧 None 💨 6 mph H 88%29.94 inHg

1:00 AM

Mostly cloudy night

78° 💧 None 💨 6 mph H 88%29.94 inHg

2:00 AM

Overcast night

78° 💧 None 💨 6 mph H 88%29.94 inHg

3:00 AM

Overcast night

78° 💧 None 💨 6 mph H 89%29.94 inHg

4:00 AM

Overcast night

77° 💧 None 💨 6 mph H 90%29.94 inHg

5:00 AM

Mostly cloudy night

77° 💧 None 💨 5 mph H 90%29.94 inHg

6:00 AM

Overcast night

76° 💧 None 💨 4 mph H 91%29.97 inHg

7:00 AM

Mostly cloudy

76° 💧 None 💨 3 mph H 91%30.00 inHg

8:00 AM

Mostly cloudy

80° 💧 None 💨 1 mph H 84%30.03 inHg

9:00 AM

Partly cloudy

83° 💧 None 💨 1 mph H 75%30.03 inHg

10:00 AM

Partly cloudy

87° 💧 None 💨 0 mph H 66%30.06 inHg

11:00 AM

Partly cloudy

91° 💧 None 💨 0 mph H 58%30.06 inHg

12:00 PM

Mostly cloudy

94° 💧 None 💨 1 mph H 53%30.03 inHg

1:00 PM

Light rain

95° 💧 0.01 in 💨 5 mph H 50%30.03 inHg

In Mermentau and, more broadly, across the state of Louisiana: The rest of the day will feature mostly cloudy skies with mild to warm temperatures ranging from 76 to 85 degrees Fahrenheit. There is a possibility of light rain, with total accumulation around 0.1 inches, and the likelihood of rainfall is high. Winds will be gentle, coming from the east at speeds up to 6 mph, with gusts reaching 13 mph. Overall, expect a damp and slightly breezy afternoon, so carrying an umbrella might be advisable in case rain develops. Temperatures will remain steady through the evening, gradually cooling as the night approaches.

15-Day Weather Outlook for Mermentau

TomorrowTomorrow

Light rain 93°/74° 💧 0.10 in 💨 7 mph

Sunday, Sep 6Sun Sep 6

Sunny 96°/74° 💧 None 💨 9 mph

Monday, Sep 7Mon Sep 7

Light rain 97°/76° 💧 0.02 in 💨 11 mph

Tuesday, Sep 8Tue Sep 8

Light rain 97°/77° 💧 0.04 in 💨 11 mph

Wednesday, Sep 9Wed Sep 9

Mostly sunny 94°/76° 💧 None 💨 8 mph

Thursday, Sep 10Thu Sep 10

Partly cloudy 97°/75° 💧 None 💨 7 mph

Friday, Sep 11Fri Sep 11

Sunny 96°/75° 💧 None 💨 13 mph

Saturday, Sep 12Sat Sep 12

Sunny 96°/75° 💧 None 💨 14 mph

Sunday, Sep 13Sun Sep 13

Light rain 96°/77° 💧 0.02 in 💨 9 mph

Monday, Sep 14Mon Sep 14

Light rain 96°/76° 💧 0.13 in 💨 9 mph

Tuesday, Sep 15Tue Sep 15

Light rain 95°/76° 💧 0.10 in 💨 8 mph

Wednesday, Sep 16Wed Sep 16

Sunny 96°/76° 💧 None 💨 12 mph

Thursday, Sep 17Thu Sep 17

Mostly sunny 96°/75° 💧 None 💨 13 mph

Friday, Sep 18Fri Sep 18

Light rain 94°/75° 💧 0.03 in 💨 9 mph

Saturday, Sep 19Sat Sep 19

Light rain 80°/66° 💧 0.01 in 💨 15 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Mermentau

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Mermentau

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 2:00 PM

PM2.5 Fine particles Good 1,0µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 1,6µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Good 51,0µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 0,2µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is favorable for outdoor activities.

UV & HEALTH

UV, Sun & Health Outlook in Mermentau

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 9,9Very high 😊Good

Tomorrow UV 9,9Very high 🙂Fair

Sunday UV 9,9Very high 🙂Fair

Monday UV 9,0Very high 😊Good

Tuesday UV 9,0Very high 😊Good

Wednesday UV 8,0Very high —Unavailable

Thursday UV 9,0Very high —Unavailable

Hourly UV index today

2:00 PMUV 8,3 3:00 PMUV 4,7 4:00 PMUV 2,3 5:00 PMUV 1,1 6:00 PMUV 0,6 7:00 PMUV 0,1

Today's weather health advice Open today's recommendations.

Very high UV risk

Use SPF 50+ sunscreen, a hat and sunglasses. Seek shade and limit exposure around midday.

Good air quality

Air quality is good and outdoor activities can be enjoyed normally.

High heat

Stay hydrated and avoid intense exercise during the hottest part of the day.

Best in the morning or late in the day

For walking, running or cycling, prefer the early morning or late afternoon.

WIND OUTLOOK

Hourly Wind Forecast for Mermentau

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

Internal PR simulation: 3.65 Population: 627

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Forecast data for Mermentau were last refreshed today at 1:57 PM. The current forecast period extends through 06/09/2026 at 11:00 AM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.