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Now · 8:32 AM

Bay St. Louis Weather & Hourly Forecast

United States · Mississippi · 39520

79°F

Sunny

Feels like: 85°F

💧 Humidity 86% 🌡 Pressure 30.03 inHg 💨 Wind 8 mph 👁 Visibility 16.8 mi ☁ Clouds 0% ☀️ UV index 0.4 · Low 🌅 Sunrise 6:45 AM 🌇 Sunset 6:54 PM

Hourly Forecast for Bay St. Louis

Today

9:00 AM

Sunny

79° 💧 None 💨 8 mph H 86%30.03 inHg

12:00 PM

Sunny

88° 💧 0.001 in 💨 8 mph H 59%30.03 inHg

3:00 PM

Mostly sunny

88° 💧 0.007 in 💨 7 mph H 58%29.97 inHg

6:00 PM

Sunny

86° 💧 0.001 in 💨 4 mph H 68%29.97 inHg

9:00 PM

Clear night

82° 💧 None 💨 1 mph H 79%30.00 inHg

Tomorrow

12:00 AM

Clear night

79° 💧 None 💨 5 mph H 76%30.00 inHg

3:00 AM

Partly cloudy night

76° 💧 None 💨 6 mph H 81%30.00 inHg

6:00 AM

Clear night

75° 💧 None 💨 8 mph H 82%30.03 inHg

9:00 AM

Sunny

79° 💧 None 💨 7 mph H 74%30.06 inHg

12:00 PM

Partly cloudy

87° 💧 0.002 in 💨 5 mph H 57%30.03 inHg

3:00 PM

Overcast

87° 💧 0.002 in 💨 5 mph H 58%29.97 inHg

6:00 PM

Overcast

84° 💧 0.001 in 💨 7 mph H 72%29.97 inHg

9:00 PM

Overcast night

82° 💧 0.003 in 💨 2 mph H 78%30.00 inHg

Friday

12:00 AM

Mostly cloudy night

79° 💧 None 💨 4 mph H 84%30.00 inHg

3:00 AM

Mostly clear night

76° 💧 0.001 in 💨 6 mph H 77%30.00 inHg

6:00 AM

Mostly clear night

75° 💧 0.001 in 💨 8 mph H 85%30.03 inHg

Today

9:00 AM

Sunny

79° 💧 None 💨 8 mph H 86%30.03 inHg

10:00 AM

Sunny

83° 💧 None 💨 9 mph H 75%30.06 inHg

11:00 AM

Sunny

86° 💧 None 💨 9 mph H 65%30.03 inHg

12:00 PM

Sunny

88° 💧 None 💨 8 mph H 59%30.03 inHg

1:00 PM

Mostly sunny

89° 💧 0.000 in 💨 7 mph H 56%30.03 inHg

2:00 PM

Mostly sunny

89° 💧 0.000 in 💨 7 mph H 57%30.00 inHg

3:00 PM

Mostly sunny

88° 💧 None 💨 7 mph H 58%29.97 inHg

4:00 PM

Sunny

88° 💧 0.004 in 💨 7 mph H 62%29.97 inHg

5:00 PM

Mostly sunny

87° 💧 0.004 in 💨 5 mph H 64%29.97 inHg

6:00 PM

Sunny

86° 💧 0.001 in 💨 4 mph H 68%29.97 inHg

7:00 PM

Clear night

83° 💧 None 💨 4 mph H 76%29.97 inHg

8:00 PM

Clear night

83° 💧 None 💨 3 mph H 78%30.00 inHg

9:00 PM

Clear night

82° 💧 None 💨 1 mph H 79%30.00 inHg

10:00 PM

Clear night

81° 💧 None 💨 3 mph H 85%30.03 inHg

11:00 PM

Clear night

79° 💧 None 💨 4 mph H 84%30.03 inHg

Tomorrow

12:00 AM

Clear night

79° 💧 None 💨 5 mph H 76%30.00 inHg

1:00 AM

Mostly clear night

78° 💧 None 💨 5 mph H 76%30.00 inHg

2:00 AM

Mostly cloudy night

77° 💧 None 💨 5 mph H 79%30.00 inHg

3:00 AM

Partly cloudy night

76° 💧 None 💨 6 mph H 81%30.00 inHg

4:00 AM

Partly cloudy night

76° 💧 None 💨 7 mph H 83%30.00 inHg

5:00 AM

Clear night

75° 💧 None 💨 8 mph H 82%30.00 inHg

6:00 AM

Clear night

75° 💧 None 💨 8 mph H 82%30.03 inHg

7:00 AM

Mostly sunny

75° 💧 None 💨 8 mph H 83%30.03 inHg

8:00 AM

Mostly sunny

76° 💧 None 💨 8 mph H 80%30.03 inHg

9:00 AM

Sunny

79° 💧 None 💨 7 mph H 74%30.06 inHg

10:00 AM

Sunny

83° 💧 None 💨 7 mph H 68%30.06 inHg

11:00 AM

Sunny

85° 💧 None 💨 6 mph H 63%30.06 inHg

12:00 PM

Partly cloudy

87° 💧 0.001 in 💨 5 mph H 57%30.03 inHg

1:00 PM

Mostly cloudy

88° 💧 None 💨 3 mph H 54%30.00 inHg

2:00 PM

Overcast

88° 💧 0.002 in 💨 3 mph H 57%30.00 inHg

3:00 PM

Overcast

87° 💧 0.002 in 💨 5 mph H 58%29.97 inHg

4:00 PM

Overcast

87° 💧 None 💨 7 mph H 59%29.97 inHg

5:00 PM

Overcast

86° 💧 None 💨 7 mph H 64%29.97 inHg

6:00 PM

Overcast

84° 💧 None 💨 7 mph H 72%29.97 inHg

7:00 PM

Mostly cloudy night

83° 💧 0.001 in 💨 5 mph H 77%29.97 inHg

8:00 PM

Mostly cloudy night

82° 💧 None 💨 3 mph H 78%30.00 inHg

9:00 PM

Overcast night

82° 💧 None 💨 2 mph H 78%30.00 inHg

10:00 PM

Mostly cloudy night

81° 💧 None 💨 4 mph H 81%30.00 inHg

11:00 PM

Mostly cloudy night

80° 💧 0.003 in 💨 6 mph H 82%30.00 inHg

Friday

12:00 AM

Mostly cloudy night

79° 💧 None 💨 4 mph H 84%30.00 inHg

1:00 AM

Mostly cloudy night

77° 💧 None 💨 6 mph H 91%30.00 inHg

2:00 AM

Partly cloudy night

77° 💧 None 💨 7 mph H 83%30.00 inHg

3:00 AM

Mostly clear night

76° 💧 None 💨 6 mph H 77%30.00 inHg

4:00 AM

Mostly clear night

76° 💧 0.001 in 💨 6 mph H 79%30.03 inHg

5:00 AM

Clear night

75° 💧 None 💨 7 mph H 81%30.03 inHg

6:00 AM

Mostly clear night

75° 💧 None 💨 8 mph H 85%30.03 inHg

7:00 AM

Sunny

75° 💧 None 💨 8 mph H 85%30.03 inHg

8:00 AM

Sunny

76° 💧 0.001 in 💨 9 mph H 81%30.06 inHg

9:00 AM

Sunny

79° 💧 None 💨 9 mph H 74%30.06 inHg

10:00 AM

Sunny

81° 💧 None 💨 9 mph H 70%30.06 inHg

11:00 AM

Sunny

83° 💧 None 💨 9 mph H 63%30.09 inHg

12:00 PM

Sunny

84° 💧 None 💨 9 mph H 59%30.06 inHg

1:00 PM

Mostly sunny

85° 💧 None 💨 9 mph H 58%30.06 inHg

2:00 PM

Mostly sunny

84° 💧 None 💨 10 mph H 62%30.03 inHg

3:00 PM

Light rain

83° 💧 0.006 in 💨 11 mph H 67%30.00 inHg

4:00 PM

Sunny

83° 💧 0.002 in 💨 10 mph H 66%29.97 inHg

5:00 PM

Sunny

82° 💧 0.001 in 💨 9 mph H 67%29.97 inHg

6:00 PM

Sunny

82° 💧 None 💨 8 mph H 70%29.97 inHg

7:00 PM

Mostly clear night

80° 💧 None 💨 7 mph H 73%29.97 inHg

Saturday

4:00 AM

Mostly cloudy night

80° 💧 None 💨 3 mph H 69%30.00 inHg

7:00 AM

Mostly sunny

77° 💧 None 💨 6 mph H 87%30.03 inHg

10:00 AM

Partly cloudy

81° 💧 None 💨 6 mph H 70%30.06 inHg

1:00 PM

Overcast

81° 💧 None 💨 9 mph H 70%30.03 inHg

4:00 PM

Mostly sunny

82° 💧 None 💨 11 mph H 64%29.97 inHg

7:00 PM

Overcast night

83° 💧 None 💨 9 mph H 61%29.97 inHg

10:00 PM

Overcast night

83° 💧 None 💨 9 mph H 61%29.97 inHg

Sunday

1:00 AM

Mostly cloudy night

83° 💧 None 💨 9 mph H 61%29.97 inHg

4:00 AM

Overcast night

82° 💧 None 💨 9 mph H 62%29.97 inHg

7:00 AM

Mostly cloudy

81° 💧 None 💨 5 mph H 71%29.97 inHg

10:00 AM

Mostly sunny

82° 💧 None 💨 6 mph H 64%30.00 inHg

1:00 PM

Mostly sunny

82° 💧 None 💨 10 mph H 64%29.97 inHg

4:00 PM

Mostly sunny

83° 💧 None 💨 10 mph H 61%29.88 inHg

7:00 PM

Overcast night

84° 💧 None 💨 13 mph H 65%29.88 inHg

10:00 PM

Partly cloudy night

84° 💧 None 💨 13 mph H 64%29.91 inHg

Monday

1:00 AM

Partly cloudy night

83° 💧 None 💨 13 mph H 66%29.91 inHg

4:00 AM

Partly cloudy night

82° 💧 None 💨 8 mph H 66%29.88 inHg

7:00 AM

Light rain

75° 💧 None 💨 3 mph H 86%29.94 inHg

10:00 AM

Mostly sunny

78° 💧 None 💨 6 mph H 80%29.94 inHg

1:00 PM

Mostly sunny

80° 💧 None 💨 9 mph H 75%29.91 inHg

4:00 PM

Partly cloudy

81° 💧 None 💨 11 mph H 73%29.85 inHg

7:00 PM

Partly cloudy night

82° 💧 None 💨 10 mph H 72%29.85 inHg

10:00 PM

Overcast night

83° 💧 None 💨 15 mph H 66%29.88 inHg

Tuesday

1:00 AM

Clear night

82° 💧 None 💨 13 mph H 67%29.88 inHg

7:00 AM

Sunny

81° 💧 None 💨 15 mph H 67%29.91 inHg

1:00 PM

Overcast

82° 💧 None 💨 7 mph H 62%29.91 inHg

7:00 PM

Light rain

83° 💧 None 💨 15 mph H 68%29.88 inHg

Wednesday

1:00 AM

Moderate rain

80° 💧 None 💨 14 mph H 80%29.85 inHg

7:00 AM

Light rain

82° 💧 None 💨 16 mph H 78%29.83 inHg

1:00 PM

Light thunderstorms

79° 💧 None 💨 19 mph H 84%29.80 inHg

7:00 PM

Moderate rain

80° 💧 None 💨 21 mph H 86%29.77 inHg

Thursday

1:00 AM

Light thunderstorms

79° 💧 None 💨 23 mph H 90%29.71 inHg

7:00 AM

Mostly cloudy

76° 💧 None 💨 11 mph H 93%29.77 inHg

1:00 PM

Sunny

75° 💧 None 💨 11 mph H 93%29.83 inHg

7:00 PM

Mostly clear night

81° 💧 None 💨 6 mph H 61%29.88 inHg

Friday

1:00 AM

Mostly clear night

82° 💧 None 💨 10 mph H 65%29.85 inHg

7:00 AM

Sunny

74° 💧 None 💨 11 mph H 80%29.94 inHg

1:00 PM

Sunny

70° 💧 None 💨 14 mph H 84%29.97 inHg

7:00 PM

Clear night

79° 💧 None 💨 9 mph H 52%30.00 inHg

Saturday

1:00 AM

Clear night

80° 💧 None 💨 10 mph H 61%29.97 inHg

7:00 AM

Sunny

72° 💧 None 💨 13 mph H 70%30.03 inHg

1:00 PM

Sunny

67° 💧 None 💨 14 mph H 75%30.06 inHg

7:00 PM

Clear night

75° 💧 None 💨 10 mph H 50%30.09 inHg

Sunday

1:00 AM

Clear night

77° 💧 None 💨 10 mph H 53%30.03 inHg

7:00 AM

Sunny

69° 💧 None 💨 12 mph H 69%30.06 inHg

1:00 PM

Mostly sunny

65° 💧 None 💨 14 mph H 76%30.09 inHg

7:00 PM

Partly cloudy night

76° 💧 None 💨 9 mph H 54%30.09 inHg

Monday

1:00 AM

Mostly cloudy night

77° 💧 None 💨 12 mph H 60%30.03 inHg

7:00 AM

Overcast

72° 💧 None 💨 12 mph H 74%30.06 inHg

1:00 PM

Overcast

70° 💧 None 💨 15 mph H 78%30.06 inHg

7:00 PM

Partly cloudy night

79° 💧 None 💨 11 mph H 68%30.09 inHg

Tuesday

1:00 AM

Mostly clear night

80° 💧 None 💨 13 mph H 70%30.03 inHg

7:00 AM

Mostly cloudy

75° 💧 None 💨 11 mph H 77%30.06 inHg

1:00 PM

Sunny

71° 💧 None 💨 12 mph H 80%30.09 inHg

7:00 PM

Clear night

79° 💧 None 💨 10 mph H 54%30.09 inHg

Wednesday

1:00 AM

Clear night

79° 💧 None 💨 6 mph H 59%30.03 inHg

7:00 AM

Partly cloudy

73° 💧 None 💨 6 mph H 86%30.03 inHg

1:00 PM

Sunny

70° 💧 None 💨 8 mph H 83%30.03 inHg

7:00 PM

Clear night

79° 💧 None 💨 7 mph H 61%30.00 inHg

Thursday

1:00 AM

Clear night

80° 💧 None 💨 8 mph H 62%29.94 inHg

In Bay St. Louis and, more broadly, across the state of Mississippi: The morning begins with a mix of sun and clouds, bringing warm conditions that are expected to continue into the afternoon. Temperatures will climb into the high 80s and low 90s, making for a hot day. Light west winds will blow at around 4 mph, with occasional gusts reaching up to 11 mph. There is a possibility of rain, with some areas receiving around 0.36 inches of accumulation, and the maximum probability of rain is about 76%. Overall, it should be a warm day with a chance of some showers, so it’s a good idea to carry an umbrella if you plan to be outdoors.

15-Day Weather Outlook for Bay St. Louis

TomorrowTomorrow

Mostly sunny 88°/75° 💧 None 💨 8 mph

Friday, Sep 25Fri Sep 25

Light rain 85°/75° 💧 0.063 in 💨 11 mph

Saturday, Sep 26Sat Sep 26

Partly cloudy 83°/79° 💧 0.008 in 💨 13 mph

Sunday, Sep 27Sun Sep 27

Mostly sunny 83°/81° 💧 0.006 in 💨 11 mph

Monday, Sep 28Mon Sep 28

Moderate rain 83°/76° 💧 0.291 in 💨 13 mph

Tuesday, Sep 29Tue Sep 29

Moderate rain 83°/80° 💧 0.106 in 💨 15 mph

Wednesday, Sep 30Wed Sep 30

Light thunderstorms 82°/79° 💧 1.564 in 💨 23 mph

Thursday, Oct 1Thu Oct 1

Mostly cloudy 82°/75° 💧 0.102 in 💨 11 mph

Friday, Oct 2Fri Oct 2

Sunny 80°/70° 💧 None 💨 14 mph

Saturday, Oct 3Sat Oct 3

Sunny 77°/67° 💧 None 💨 14 mph

Sunday, Oct 4Sun Oct 4

Mostly sunny 77°/65° 💧 None 💨 14 mph

Monday, Oct 5Mon Oct 5

Overcast 80°/70° 💧 0.001 in 💨 15 mph

Tuesday, Oct 6Tue Oct 6

Mostly cloudy 79°/71° 💧 None 💨 12 mph

Wednesday, Oct 7Wed Oct 7

Partly cloudy 80°/70° 💧 None 💨 8 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Bay St. Louis

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Bay St. Louis

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 9:00 AM

PM2.5 Fine particles Good 3,8µg/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 4,3µg/m³

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

O₃ Ozone Fair 98,1µg/m³

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

NO₂ Nitrogen dioxide Good 0,9µg/m³

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

Air quality is acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in Bay St. Louis

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 8,8Very high 🙂Fair

Tomorrow UV 8,5Very high 🙂Fair

Friday UV 7,1High 🙂Fair

Saturday UV 6,3High 🙂Fair

Sunday UV 6,0High 😐Moderate

Monday UV 7,0High —Unavailable

Tuesday UV 6,0High —Unavailable

Hourly UV index today

9:00 AMUV 1,6 10:00 AMUV 3,7 11:00 AMUV 6,1 12:00 PMUV 8,1 1:00 PMUV 8,8 2:00 PMUV 7,9 3:00 PMUV 5,8 4:00 PMUV 2,5 5:00 PMUV 1,0 6:00 PMUV 0,3 7:00 PMUV 0,0

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.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

Stay hydrated

Drink water regularly, especially during physical activity or prolonged sun exposure. High humidity can make it feel hotter.

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 Bay St. Louis

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · BAY ST. LOUIS, MISSISSIPPI

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 5:00 AM–6:00 AM.

95/100Best-hour score

BEST TIME TONIGHT 5:00 AM–6:00 AM Astronomical darkness: 8:12 PM–5:27 AM

☁ Cloud cover 7% Real hourly forecast for the best viewing hour.

☾ Moonlight 95% Waxing Gibbous · Moon below the horizon at the best viewing hour.

☄ Meteor activity Southern Taurids Reference ZHR 7 · Radiant 71° high at the best hour.

✦ Estimated visible meteors 1–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min73%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

ACTIVE NOW

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

NOV 6–NOV 30

LeonidsStart NOV 6 · Peak NOV 17 · End NOV 30 · ZHR 15 · 52% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

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Forecast data for Bay St. Louis were last refreshed today at 8:30 AM. The current forecast period extends through 25/09/2026 at 6:00 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.