Mexico · 1991–2020

Best time to visit
San Isidro.

May leads for comfortable weather in San Isidro: typically 25.3°C by day, 5.8°C at night, with 26 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high25.3°C

Typical low5.8°C

Rain in May26 mm

Comfort

May

May · April · June

79climate match

Beach

May

May · June · April

46climate match

Outdoors

October

October · March · November

86climate match

The weakest month is January, scoring 43 against May’s 79 — nights drop to -1.7°C, and days reach only 16.5°C, 7° below 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

4316.5° / -1.7°

Feb

5018° / -1.8°

Mar

6020.5° / -0.7°

Apr

7523.3° / 2.5°

May

7925.3° / 5.8°

Jun

7124.9° / 9.4°

Jul

5622.3° / 10.1°

Aug

5521.5° / 9.9°

Sep

5820.6° / 8.6°

Oct

6720.5° / 4.6°

Nov

5518.8° / -0.2°

Dec

4516.5° / -1.9°

Monthly climate evidence for San Isidro — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	16.5°C	-1.7°C	47 mm	2.3	10 h 49	43	Good coverage
February	18°C	-1.8°C	24 mm	1.1	11 h 20	50	Good coverage
March	20.5°C	-0.7°C	14 mm	1	11 h 57	60	Good coverage
April	23.3°C	2.5°C	10 mm	0.6	12 h 40	75	Good coverage
May	25.3°C	5.8°C	26 mm	3.4	13 h 16	79	Good coverage
June	24.9°C	9.4°C	104 mm	10.1	13 h 35	71	Good coverage
July	22.3°C	10.1°C	170 mm	15	13 h 28	56	Good coverage
August	21.5°C	9.9°C	153 mm	15	12 h 57	55	Good coverage
September	20.6°C	8.6°C	128 mm	10	12 h 15	58	Good coverage
October	20.5°C	4.6°C	49 mm	4.3	11 h 34	67	Good coverage
November	18.8°C	-0.2°C	34 mm	2.1	10 h 58	55	Good coverage
December	16.5°C	-1.9°C	16 mm	1.5	10 h 41	45	Good coverage

Records at NAVIOS VIEJOS, 1964–2008
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	27.8°C28 Jan 1970	-16.1°C5 Jan 1985	75 mm22 Jan 2005	262 mm1992 · driest 0 mm in 1998	44
February	28.9°C17 Feb 1970	-15.6°C6 Feb 1982	75 mm3 Feb 2005	159 mm2005 · driest 0 mm in 2008	44
March	31.7°C13 Mar 1990	-15.0°C18 Mar 1978	65 mm4 Mar 1968	161 mm1968 · driest 0 mm in 1978	43
April	32.8°C25 Apr 2000	-15.0°C12 Apr 1978	53 mm3 Apr 1966	87 mm1997 · driest 0 mm in 2001	41
May	36.7°C27 May 1964	-14.4°C3 May 1978	55 mm18 May 1990	90 mm1990 · driest 0 mm in 1998	43
June	36.7°C20 Jun 1969	-5.0°C1 Jun 1998	69 mm21 Jun 2007	247 mm2007 · driest 4 mm in 2005	43
July	35.6°C16 Jul 1989	1.7°C17 Jul 1986	81 mm15 Jul 1990	462 mm1990 · driest 38 mm in 1982	43
August	35.0°C26 Aug 1964	1.1°C30 Aug 1970	95 mm14 Aug 1990	451 mm1990 · driest 46 mm in 1982	42
September	35.6°C20 Sep 1964	-5.0°C11 Sep 1988	90 mm12 Sep 1968	325 mm1970 · driest 4 mm in 1979	42
October	30.0°C5 Oct 1964	-11.1°C21 Oct 1982	50 mm3 Oct 1996	132 mm1981 · driest 0 mm in 1999	43
November	30.0°C3 Nov 1971	-14.4°C22 Nov 1979	130 mm25 Nov 1982	130 mm1982 · driest 0 mm in 1973	42
December	28.3°C26 Dec 1970	-15.6°C2 Dec 1977	46 mm15 Dec 1965	115 mm1974 · driest 0 mm in 2003	43

Typical days per month at NAVIOS VIEJOS, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	<1	0	18	1
February	<1	0	19	<1
March	4	0	18	<1
April	13	<1	8	<1
May	21	3	2	<1
June	18	2	<1	3
July	6	0	0	6
August	2	0	0	5
September	1	0	<1	4
October	2	0	4	2
November	<1	0	17	1
December	0	0	20	<1

How often, not how much — every day in NAVIOS VIEJOS’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	13%	7%	4%	4%	13.9–18.3°C
February	26%	5%	3%	3%	14.2–20.1°C
March	55%	3%	1%	1%	17.3–22.2°C
April	80%	2%	<1%	<1%	19.0–25.4°C
May	84%	8%	2%	8%	21.1–27.0°C
June	69%	27%	11%	39%	21.1–27.1°C
July	46%	45%	18%	65%	19.8–23.3°C
August	45%	45%	19%	60%	19.3–22.8°C
September	50%	33%	14%	39%	18.6–22.3°C
October	57%	12%	5%	10%	17.7–22.2°C
November	43%	6%	3%	5%	16.0–20.7°C
December	18%	7%	4%	6%	14.2–18.9°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.

1965Each stripe is one year’s mean temperature against the 36-year average. Warmest: 2002. Coolest: 1977.2007

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 3978304
NOAA station: MXN00010048 · NAVIOS VIEJOS
Station distance: 18.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 16 usable years
Daylight: Calculated from latitude 23.67°, mid-month, sunrise to sunset including refraction. Not a station measurement.
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 NAVIOS VIEJOS is what differs

Llano Grande→Navajas→El Encinal→Regocijo→Los Mimbres→Echeverria de la Sierra→

Or put two places side by side: San Isidro vs Llano Grande

Best time to visitSan Isidro.

May

May

October

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
San Isidro.

The whole year,
without the guesswork.

Nearby, measured,
and named.