Mexico · 1991–2020

Best time to visit
La Unión.

March leads for comfortable weather in La Unión: typically 32.7°C by day, 18.5°C at night, with 4 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMarch

Typical high32.7°C

Typical low18.5°C

Rain in March4 mm

Comfort

March

March · January · February

65climate match

Beach

November

November · December · January

87climate match

Outdoors

January

January · February · March

46climate match

The weakest month is September, scoring 21 against March’s 65 — 247 mm of rain falls, and days average 31.9°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

6432.5° / 19.3°

Feb

6432.6° / 18.9°

Mar

6532.7° / 18.5°

Apr

6233.3° / 19.2°

May

5434.3° / 21.6°

Jun

2533.5° / 23.9°

Jul

2933.2° / 23.5°

Aug

2833.2° / 23.4°

Sep

2131.9° / 23.2°

Oct

4232.1° / 22.8°

Nov

5932.9° / 21.4°

Dec

6232.8° / 20°

Monthly climate evidence for La Unión — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 14 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	32.5°C	19.3°C	22 mm	1	28.1°C	11 h 09	64	Good coverage
February	32.6°C	18.9°C	11 mm	0.4	27.4°C	11 h 32	64	Good coverage
March	32.7°C	18.5°C	4 mm	0.2	26.9°C	11 h 59	65	Good coverage
April	33.3°C	19.2°C	0 mm	0	26.9°C	12 h 32	62	Good coverage
May	34.3°C	21.6°C	14 mm	1.1	27.9°C	12 h 58	54	Good coverage
June	33.5°C	23.9°C	185 mm	10	29.3°C	13 h 12	25	Good coverage
July	33.2°C	23.5°C	169 mm	10.7	30.1°C	13 h 07	29	Good coverage
August	33.2°C	23.4°C	173 mm	11.1	30.3°C	12 h 44	28	Good coverage
September	31.9°C	23.2°C	247 mm	12.6	29.8°C	12 h 13	21	Good coverage
October	32.1°C	22.8°C	130 mm	7	29.6°C	11 h 42	42	Good coverage
November	32.9°C	21.4°C	20 mm	0.9	29.2°C	11 h 16	59	Good coverage
December	32.8°C	20°C	6 mm	0.4	28.7°C	11 h 03	62	Good coverage

Records at LA UNION, 1925–2013
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	41.7°C19 Jan 1937	11.1°C7 Jan 1936	115 mm23 Jan 1980	395 mm1992 · driest 0 mm in 1972	70
February	42.8°C12 Feb 1933	8.9°C29 Feb 1936	100 mm3 Feb 2010	226 mm1935 · driest 0 mm in 1965	70
March	43.3°C12 Mar 1933	7.8°C9 Mar 1936	57 mm5 Mar 1968	84 mm1968 · driest 0 mm in 1989	68
April	43.9°C15 Apr 1936	8.3°C13 Apr 1928	46 mm4 Apr 1966	54 mm1966 · driest 0 mm in 1997	70
May	43.9°C20 May 1936	12.8°C7 May 1936	309 mm26 May 1983	342 mm1983 · driest 0 mm in 1972	69
June	43.3°C26 Jun 1933	15.6°C5 Jun 1933	212 mm22 Jun 1973	557 mm2012 · driest 0 mm in 1932	71
July	41.7°C4 Jul 1936	16.7°C30 Jul 1933	122 mm13 Jul 1983	443 mm1931 · driest 14 mm in 1968	68
August	42.8°C17 Aug 1936	16.7°C21 Aug 1935	185 mm28 Aug 1981	475 mm1969 · driest 0 mm in 1932	67
September	41.7°C2 Sep 1934	17.2°C27 Sep 1933	395 mm14 Sep 1984	720 mm1998 · driest 32 mm in 1982	68
October	41.7°C21 Oct 1926	16.1°C31 Oct 1933	320 mm7 Oct 1976	395 mm1976 · driest 0 mm in 2010	69
November	42.8°C6 Nov 1926	11.7°C24 Nov 1929	153 mm3 Nov 2002	274 mm2002 · driest 0 mm in 1993	70
December	43.3°C20 Dec 1933	12.2°C15 Dec 1933	80 mm27 Dec 1974	191 mm1925 · driest 0 mm in 1981	70

Typical days per month at LA UNION, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	31	30	<1
February	28	27	<1
March	31	30	<1
April	30	30	0
May	31	31	<1
June	30	29	5
July	31	30	5
August	31	30	5
September	30	27	6
October	31	29	4
November	30	29	<1
December	31	30	<1

How often, not how much — every day in LA UNION’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	97%	3%	1%	2%	30.8–33.6°C
February	99%	1%	<1%	<1%	30.5–33.9°C
March	99%	<1%	<1%	0%	30.8–34.5°C
April	100%	<1%	<1%	0%	31.5–35.7°C
May	96%	4%	1%	5%	32.4–35.8°C
June	68%	31%	14%	43%	31.8–34.7°C
July	62%	37%	16%	47%	31.2–35.2°C
August	64%	37%	14%	49%	31.2–35.5°C
September	55%	45%	20%	62%	30.4–33.9°C
October	79%	21%	9%	21%	31.1–33.8°C
November	96%	4%	1%	2%	31.6–34.2°C
December	98%	2%	<1%	<1%	31.2–33.5°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.

1928Each stripe is one year’s mean temperature against the 58-year average. Warmest: 1933. Coolest: 1975.2010

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 3998919
NOAA station: MXN00012052 · LA UNION
Station distance: 8.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 20 usable years
Daylight: Calculated from latitude 17.99°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 14 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 LA UNION is what differs

Joluta→Rincón de Cucharatepec→Feliciano→El Chico→El Limón→Chutla de Nava→

Or put two places side by side: La Unión vs Joluta

Best time to visitLa Unión.