United States · 1991–2020

Best time to visit
San Leon.

April leads for comfortable weather in San Leon: typically 25.3°C by day, 15.5°C at night, with 107 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortApril

Typical high25.3°C

Typical low15.5°C

Rain in April107 mm

Comfort

April

April · March · November

82climate match

Beach

May

May · July · September

77climate match

Outdoors

February

February · March · November

84climate match

The weakest month is August, scoring 31 against April’s 82 — days average 33.1°C, 9° above the 24°C the score treats as ideal, and 169 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

4617.2° / 6.7°

Feb

6419.2° / 8.9°

Mar

8022.3° / 12.1°

Apr

8225.3° / 15.5°

May

5928.9° / 19.8°

Jun

3731.8° / 23°

Jul

4032.9° / 23.7°

Aug

3133.1° / 23.7°

Sep

3831° / 21.5°

Oct

6827.2° / 16.4°

Nov

7322.1° / 11°

Dec

5318.3° / 7.7°

Monthly climate evidence for San Leon — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 31 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	17.2°C	6.7°C	122 mm	7.8	14.5°C	10 h 27	46	Strong coverage
February	19.2°C	8.9°C	77 mm	6.7	14.9°C	11 h 06	64	Strong coverage
March	22.3°C	12.1°C	84 mm	5.8	17.9°C	11 h 54	80	Strong coverage
April	25.3°C	15.5°C	107 mm	5.5	21.5°C	12 h 50	82	Strong coverage
May	28.9°C	19.8°C	130 mm	5.7	25.3°C	13 h 37	59	Strong coverage
June	31.8°C	23°C	166 mm	8	28.5°C	14 h 01	37	Strong coverage
July	32.9°C	23.7°C	111 mm	7.9	29.6°C	13 h 52	40	Strong coverage
August	33.1°C	23.7°C	169 mm	8.6	30.0°C	13 h 12	31	Strong coverage
September	31°C	21.5°C	190 mm	8.7	28.9°C	12 h 18	38	Strong coverage
October	27.2°C	16.4°C	147 mm	6.6	25.4°C	11 h 24	68	Strong coverage
November	22.1°C	11°C	115 mm	5.9	20.7°C	10 h 38	73	Strong coverage
December	18.3°C	7.7°C	116 mm	7.5	16.6°C	10 h 16	53	Strong coverage

Records at HOUSTON NWSO, 1990–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	28.9°C2 Jan 2026	-7.8°C22 Jan 2025	132 mm9 Jan 2012	276 mm2024 · driest 7 mm in 2009	36
February	30.0°C19 Feb 1996	-9.4°C16 Feb 2021	98 mm10 Feb 2018	206 mm1992 · driest 10 mm in 2002	36
March	33.3°C25 Mar 2020	-5.0°C4 Mar 2002	130 mm31 Mar 2007	257 mm2007 · driest 6 mm in 1996	36
April	33.9°C27 Apr 2011	2.8°C7 Apr 1996	200 mm18 Apr 2009	346 mm2009 · driest 1 mm in 2011	36
May	36.1°C31 May 1998	6.1°C4 May 2013	170 mm30 May 1995	295 mm2020 · driest 0 mm in 1998	36
June	39.4°C29 Jun 2013	13.9°C9 Jun 1996	276 mm9 Jun 2001	527 mm2001 · driest 22 mm in 2009	36
July	38.3°C10 Jul 2022	16.7°C13 Jul 2002	135 mm26 Jul 2024	513 mm2024 · driest 12 mm in 1993	36
August	41.7°C27 Aug 2023	15.6°C17 Aug 1992	408 mm27 Aug 2017	1212 mm2017 · driest 17 mm in 1993	35
September	41.1°C4 Sep 2000	10.0°C25 Sep 1994	170 mm13 Sep 2008	625 mm2018 · driest 26 mm in 2017	34
October	35.6°C14 Oct 2024	-1.7°C31 Oct 1993	154 mm31 Oct 2015	398 mm2002 · driest 16 mm in 1992	35
November	31.1°C6 Nov 2017	-3.3°C28 Nov 1992	149 mm2 Nov 2004	407 mm2004 · driest 20 mm in 1999	34
December	29.4°C9 Dec 2021	-8.9°C23 Dec 2022	194 mm4 Dec 2002	320 mm2002 · driest 21 mm in 2013	36

Typical days per month at HOUSTON NWSO, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	2	0	4	4
February	4	0	1	2
March	10	<1	<1	2
April	19	1	0	3
May	29	12	0	3
June	30	26	0	4
July	31	29	0	4
August	31	28	0	4
September	29	22	0	4
October	24	8	0	4
November	11	<1	1	3
December	4	0	3	3

How often, not how much — every day in HOUSTON NWSO’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	29%	25%	12%	25%	14.5–20.4°C
February	43%	23%	7%	22%	16.7–22.1°C
March	66%	19%	7%	13%	20.3–24.6°C
April	78%	19%	8%	16%	23.9–27.1°C
May	80%	20%	11%	22%	27.7–30.5°C
June	73%	27%	14%	32%	30.7–33.2°C
July	74%	26%	12%	30%	31.9–34.3°C
August	72%	28%	12%	36%	31.8–34.6°C
September	72%	28%	15%	30%	29.8–32.7°C
October	78%	20%	11%	21%	26.1–28.8°C
November	58%	20%	10%	19%	19.7–24.7°C
December	34%	23%	9%	21%	17.2–20.6°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.

1991Each stripe is one year’s mean temperature against the 33-year average. Warmest: 2024. Coolest: 1993.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4726477
NOAA station: USC00414333 · HOUSTON NWSO
Station distance: 15.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 29.48°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 31 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 HOUSTON NWSO is what differs

League City→La Porte→Dickinson→Seabrook→Santa Fe→Webster→

Or put two places side by side: San Leon vs League City

Best time to visitSan Leon.

April

May

February

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
San Leon.

The whole year,
without the guesswork.

Nearby, measured,
and named.