United States · 1991–2020

Best time to visit
Old Saint Marys.

March leads for comfortable weather in Old Saint Marys: typically 23.6°C by day, 15.2°C at night, with 47 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMarch

Typical high23.6°C

Typical low15.2°C

Rain in March47 mm

Comfort

March

March · November · April

96climate match

Beach

October

October · April · May

88climate match

Outdoors

December

December · February · January

98climate match

The weakest month is September, scoring 43 against March’s 96 — days average 32.1°C, 8° above the 24°C the score treats as ideal.

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

7118.9° / 9.2°

Feb

8220.5° / 11.5°

Mar

9623.6° / 15.2°

Apr

8426.8° / 18.8°

May

6229.8° / 22.6°

Jun

4432.4° / 25.4°

Jul

4433° / 26°

Aug

4633.8° / 25.9°

Sep

4332.1° / 23.8°

Oct

7028.7° / 19.6°

Nov

9424° / 14.3°

Dec

7619.8° / 9.9°

Monthly climate evidence for Old Saint Marys — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 41 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	18.9°C	9.2°C	43 mm	4	18.3°C	10 h 32	71	Good coverage
February	20.5°C	11.5°C	26 mm	3	17.9°C	11 h 10	82	Good coverage
March	23.6°C	15.2°C	47 mm	3.3	18.9°C	11 h 55	96	Good coverage
April	26.8°C	18.8°C	36 mm	2.4	21.7°C	12 h 48	84	Good coverage
May	29.8°C	22.6°C	73 mm	3.6	25.1°C	13 h 32	62	Good coverage
June	32.4°C	25.4°C	89 mm	4.9	28.1°C	13 h 55	44	Good coverage
July	33°C	26°C	72 mm	4.7	28.7°C	13 h 46	44	Good coverage
August	33.8°C	25.9°C	45 mm	3.2	29.2°C	13 h 08	46	Good coverage
September	32.1°C	23.8°C	115 mm	6.8	29.1°C	12 h 17	43	Good coverage
October	28.7°C	19.6°C	66 mm	5.1	26.6°C	11 h 27	70	Good coverage
November	24°C	14.3°C	65 mm	3.8	23.0°C	10 h 43	94	Good coverage
December	19.8°C	9.9°C	25 mm	3.5	20.3°C	10 h 22	76	Good coverage

Records at ROCKPORT ARANSAS CO AP, 1996–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	31.7°C13 Jan 2014	-6.6°C22 Jan 2025	47 mm9 Jan 2013	136 mm2007 · driest 3 mm in 2025	30
February	32.2°C2 Feb 2006	-3.8°C14 Feb 2021	69 mm6 Feb 2013	71 mm1999 · driest 0 mm in 2026	30
March	34.4°C12 Mar 2023	-5.6°C4 Mar 2002	153 mm14 Mar 2000	170 mm2000 · driest 1 mm in 2020	30
April	37.8°C28 Apr 2014	3.9°C8 Apr 2007	100 mm16 Apr 2012	164 mm2015 · driest 0 mm in 2011	30
May	36.7°C9 May 1998	10.0°C3 May 2004	185 mm8 May 2004	330 mm2004 · driest 0 mm in 1998	30
June	39.4°C26 Jun 2012	18.3°C2 Jun 1997	175 mm20 Jun 2018	269 mm2018 · driest 0 mm in 2008	30
July	37.2°C6 Jul 2005	20.0°C16 Jul 2007	247 mm7 Jul 2021	467 mm2021 · driest 0 mm in 2011	31
August	39.4°C29 Aug 2012	16.7°C29 Aug 2011	75 mm28 Aug 2001	183 mm2022 · driest 0 mm in 2023	30
September	41.7°C5 Sep 2000	11.1°C30 Sep 2020	105 mm29 Sep 2007	424 mm2018 · driest 2 mm in 2008	30
October	36.1°C7 Oct 2019	3.9°C29 Oct 2017	118 mm24 Oct 2002	221 mm2002 · driest 0 mm in 2010	30
November	31.7°C24 Nov 1997	0.0°C28 Nov 2011	181 mm19 Nov 2009	291 mm2009 · driest 2 mm in 2023	30
December	29.4°C23 Dec 2015	-6.6°C23 Dec 2022	29 mm30 Dec 2020	64 mm2002 · driest 1 mm in 2013	30

Typical days per month at ROCKPORT ARANSAS CO AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	4	<1	1	1
February	5	<1	<1	<1
March	14	<1	<1	1
April	25	3	0	1
May	30	17	0	2
June	30	28	0	2
July	30	30	0	2
August	30	30	0	1
September	29	25	0	3
October	27	14	0	2
November	16	<1	0	1
December	6	0	<1	<1

How often, not how much — every day in ROCKPORT ARANSAS CO AP’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	47%	12%	4%	7%	15.9–21.6°C
February	61%	9%	2%	2%	18.1–23.2°C
March	81%	10%	3%	3%	21.2–26.1°C
April	91%	8%	3%	3%	25.2–28.6°C
May	88%	13%	7%	11%	28.6–31.1°C
June	84%	17%	7%	18%	31.6–33.1°C
July	86%	14%	6%	12%	32.1–34.0°C
August	90%	11%	4%	10%	33.2–34.9°C
September	79%	21%	9%	22%	31.4–33.9°C
October	84%	16%	5%	11%	27.7–30.6°C
November	73%	13%	4%	9%	21.3–26.2°C
December	54%	11%	2%	5%	18.1–22.3°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.

1997Each stripe is one year’s mean temperature against the 29-year average. Warmest: 2024. Coolest: 1997.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4716493
NOAA station: USW00012972 · ROCKPORT ARANSAS CO AP
Station distance: 16 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 28.10°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 41 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 ROCKPORT ARANSAS CO AP is what differs

Fulton→Lamar→Holiday Beach→Bayside→Copano Village→

Or put two places side by side: Old Saint Marys vs Fulton

Best time to visitOld Saint Marys.