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Weather in Bay St. Louis, MS · National Weather Service + NOAA

Bay St. Louis has milder winters than most of Mississippi

Bay St. Louis has warm winters and warm summers, with plenty of rain. A typical July afternoon reaches 89°, a January night drops to 43°, and snow is almost unheard of. In November, a normal day reaches 69° and a normal night drops to 51°.

Winter 61°/45°Spring 76°/60°Summer 89°/75°Fall 78°/61°
Right now
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Sunrise 6:15 am · sunset 5:06 pm

Getting the latest forecast from the National Weather Service…

What stands out about Bay St. Louis’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
Milder winters than most of MississippiJanuary nights average 43°, milder than 422 of 426 Mississippi towns.Cool summersJuly afternoons average 89°, cooler than 418 of 426 Mississippi towns.A long growing season287 frost-free days, from Feb 21 to Dec 3.Snow is rareNo measurable snow in a normal year.
A normal year

Where today sits in Bay St. Louis’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
61° / 45°
Snow is rare
Spring
76° / 60°
Last frost around Feb 21
Summer
89° / 75°
48 days reach 90° in a normal year
Fall now
78° / 61°
First frost around Dec 3
28 daysuntil the usual first frost (Dec 3)
Best months to be outside
FebMarAprMayOctNov
Highs of 62–84° and lows of 40° or more
How much snow does Bay St. Louis get?Almost none.When is it wettest?July, with 7.5 inches.Is it warmer than it used to be?+0.9° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in Bay St. Louis.

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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Bay St. Louis itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Stennis-diamondhead, MS (6 mi, snow) and Waveland, MS (2 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.