Tides Today & Tomorrow in Southwest Pass, Mississippi River, LA

The lowest tide this week in Southwest Pass, Mississippi River, LA is -0.8 ft on Monday, Jul 13 at 7:03 pm.

The highest tide this week in Southwest Pass, Mississippi River, LA is 2.0 ft on Tuesday, Jul 14 at 9:29 am — worth noting for launching your boat and being alert for possible high tide flooding.

Slack tide in Southwest Pass, Mississippi River, LA is approximately 2:16 am — midway between the next high and low tide, when tidal current is weakest. This is the preferred window for boat crossings, underwater visibility, and fishing in areas with strong currents.

Southwest Pass, Mississippi River, LA is currently in a spring phase. Tonight's moon is 1% illuminated. Spring tides (largest swings) occur near new and full moons; neap tides (smallest swings) occur near first and third quarter moons. Tidal ranges this week are near their weekly maximum.

Tide heights on this page are measured from Mean Lower Low Water (MLLW), the U.S. NOAA standard. A height of 0 ft represents the 19-year average of each day's lower low tide. Negative values indicate a "minus tide" — water levels below that long-term reference.

Tide predictions for Southwest Pass, Mississippi River, LA come from NOAA's harmonic analysis and are typically accurate within about ±10 minutes on timing and ±0.5 ft on height. Actual water levels can deviate further due to sustained winds, atmospheric pressure changes, river flow, and storm surge. During major weather events, be sure to check US Harbors weather pages for factors that could impact tidal predictions.

Tide data for Southwest Pass, Mississippi River, LA is sourced from NOAA Station #8760959. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8760959.

High tides in Southwest Pass, Mississippi River, LA today: 8:31 am (2.0 ft).

Low tides in Southwest Pass, Mississippi River, LA today: 7:03 pm (-0.8 ft). The 7:03 pm low of -0.8 ft is a minus tide — water below the MLLW reference datum, which can expose tidepools, mudflats, and shellfish beds not normally accessible.

Today's tidal range in Southwest Pass, Mississippi River, LA is 2.8 ft — the difference between the day's highest and lowest water level. This month's average daily range is about 1.6 ft, so today's swing is above-average.

Tonight the moon over Southwest Pass, Mississippi River, LA is New Moon (1% illuminated). This places Southwest Pass, Mississippi River, LA in a spring tide cycle, so tidal ranges are near their weekly maximum this week.

Southwest Pass, Mississippi River, LA has diurnal tides — one high tide and one low tide per day, roughly every 24 hours and 50 minutes.