Bay St. Louis, Mississippi Weather
Cicadas claim the scorching afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Bay St. Louis weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast33%—90°74°—
- MondayJul 6Light Drizzle51%—89°75°-1°
- TuesdayJul 7T-storm w/ Hail46%—92°76°+3°
- WednesdayJul 8T-storm w/ Hail22%—93°76°+1°
- ThursdayJul 9Light Drizzle14%—92°77°-1°
- FridayJul 10Mostly Clear16%—91°78°-1°
- SaturdayJul 11Thunderstorm23%—89°78°-2°
AQI 44 (Good), driven by PM2.5. AQI down 18 over the last 6 hours — air quality is improving sharply. PM2.5 at 11.5 µg/m³ (AQI 55) with a 0.88 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 12 PM.
What's driving it
PM × Wind × Precip
PM2.5 at 11.5 µg/m³ (AQI 55) with a 0.88 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.88
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:09 PM
- Moonset
- 11:12 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Bay St. Louis at a glance
- Today vs. normal: 3°F below the seasonal normal for this latitude
- Last frost: February 17 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
15-Day Forecast — Bay St. Louis
- Sun90°74°33%
- Mon89°75°51%
- Tue92°76°46%
- Wed93°76°22%
- Thu92°77°14%
- Fri91°78°16%
- Sat89°78°23%
- Sun79°74°46%
- Mon83°74°53%
- Tue91°74°28%
- Wed90°77°27%
- Thu89°77°40%
- Fri89°75°48%
- Sat87°74°57%
- Sun84°76°48%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Bay St. Louis
SPC includes Bay St. Louis in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Bay St. Louis
- 39520
- 39521