United States · 1991–2020

Best time to visit
Bay Saint Louis.

October leads for comfortable weather in Bay Saint Louis: typically 25.9°C by day, 14.8°C at night, with 86 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortOctober

Typical high25.9°C

Typical low14.8°C

Rain in October86 mm

Comfort

October

October · April · November

84climate match

Beach

September

September · May · October

70climate match

Outdoors

November

November · March · February

82climate match

The weakest month is July, scoring 28 against October’s 84 — days average 31.8°C, 8° above the 24°C the score treats as ideal, and 196 mm of rain falls.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

3515.8° / 5.3°

Feb

4717.4° / 6.3°

Mar

6421.2° / 10.7°

Apr

8024.4° / 14.1°

May

6228.1° / 18.6°

Jun

3830.8° / 22.1°

Jul

2831.8° / 23.3°

Aug

3632.1° / 23.1°

Sep

4930.1° / 20.7°

Oct

8425.9° / 14.8°

Nov

6620.6° / 9.2°

Dec

4416.8° / 6°

Monthly climate evidence for Bay Saint Louis — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 21 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	15.8°C	5.3°C	148 mm	8	13.1°C	10 h 23	35	Strong coverage
February	17.4°C	6.3°C	121 mm	7	14.2°C	11 h 04	47	Strong coverage
March	21.2°C	10.7°C	144 mm	6.6	17.7°C	11 h 54	64	Good coverage
April	24.4°C	14.1°C	141 mm	5.9	21.6°C	12 h 52	80	Strong coverage
May	28.1°C	18.6°C	145 mm	6.1	25.5°C	13 h 40	62	Strong coverage
June	30.8°C	22.1°C	171 mm	11	28.7°C	14 h 05	38	Strong coverage
July	31.8°C	23.3°C	196 mm	12.3	29.6°C	13 h 55	28	Strong coverage
August	32.1°C	23.1°C	149 mm	10.2	29.8°C	13 h 14	36	Strong coverage
September	30.1°C	20.7°C	148 mm	8.2	28.3°C	12 h 19	49	Strong coverage
October	25.9°C	14.8°C	86 mm	5.5	24.2°C	11 h 23	84	Strong coverage
November	20.6°C	9.2°C	105 mm	5.7	19.1°C	10 h 35	66	Strong coverage
December	16.8°C	6°C	118 mm	7.5	15.2°C	10 h 12	44	Strong coverage

Records at WAVELAND, 1982–2022
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	26.7°C7 Jan 2017	-14.4°C22 Jan 1985	238 mm7 Jan 1991	688 mm1991 · driest 8 mm in 2003	37
February	31.1°C5 Feb 1989	-9.4°C4 Feb 1996	122 mm14 Feb 2009	316 mm2013 · driest 14 mm in 1999	35
March	30.6°C30 Mar 2020	-5.6°C9 Mar 1996	137 mm8 Mar 1998	303 mm1995 · driest 6 mm in 2006	32
April	34.4°C22 Apr 1987	-2.2°C5 Apr 1987	144 mm7 Apr 1983	498 mm1991 · driest 2 mm in 1999	36
May	35.0°C31 May 1998	5.6°C12 May 1992	231 mm30 May 2005	469 mm1991 · driest 1 mm in 1998	35
June	37.2°C29 Jun 1988	6.7°C1 Jun 1984	197 mm11 Jun 2001	398 mm2017 · driest 29 mm in 1990	36
July	39.4°C30 Jul 1986	16.1°C9 Jul 1988	184 mm6 Jul 2005	377 mm2005 · driest 13 mm in 1986	36
August	40.0°C2 Aug 1986	13.3°C27 Aug 1990	295 mm30 Aug 2012	528 mm2012 · driest 19 mm in 2007	38
September	36.1°C6 Sep 1989	5.6°C27 Sep 2006	196 mm26 Sep 2002	540 mm1998 · driest 6 mm in 1997	34
October	33.3°C1 Oct 1986	0.6°C31 Oct 1993	130 mm23 Oct 2007	260 mm2002 · driest 5 mm in 1992	36
November	29.4°C3 Nov 2004	-3.9°C14 Nov 2019	170 mm7 Nov 1989	364 mm1989 · driest 10 mm in 2017	35
December	27.2°C2 Dec 1985	-13.3°C23 Dec 1989	146 mm22 Dec 2006	401 mm2009 · driest 24 mm in 2011	36

Typical days per month at WAVELAND, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	<1	0	6	4
February	<1	0	3	3
March	6	0	<1	4
April	14	<1	0	3
May	27	8	0	3
June	29	21	0	5
July	30	26	0	6
August	30	27	0	4
September	29	18	0	4
October	21	3	0	2
November	5	0	1	3
December	<1	0	5	3

How often, not how much — every day in WAVELAND’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	15%	26%	12%	29%	13.3–17.9°C
February	24%	26%	13%	25%	15.7–19.2°C
March	53%	22%	13%	19%	18.7–23.0°C
April	75%	19%	11%	14%	22.4–25.9°C
May	81%	21%	11%	24%	26.8–29.7°C
June	67%	34%	17%	45%	29.1–32.4°C
July	62%	38%	18%	54%	30.7–33.1°C
August	67%	33%	15%	43%	30.8–33.3°C
September	73%	26%	13%	27%	29.1–31.2°C
October	78%	17%	8%	15%	24.6–27.1°C
November	49%	21%	10%	19%	18.6–23.0°C
December	21%	24%	11%	23%	15.0–18.6°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1983Each stripe is one year’s mean temperature against the 24-year average. Warmest: 2020. Coolest: 1983.2020

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4417205
NOAA station: USC00229426 · WAVELAND
Station distance: 5.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 23 usable years
Daylight: Calculated from latitude 30.31°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 21 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from WAVELAND is what differs

Diamondhead→Waveland→Pass Christian→Kiln→Henderson Point→Ansley→

Or put two places side by side: Bay Saint Louis vs Diamondhead

Best time to visitBay Saint Louis.