October
October · March · September
Mexico · 1991–2020
October leads for comfortable weather in San Isidro: typically 26.7°C by day, 11.2°C at night, with 21 mm of rain. Based on measured 1991–2020 NOAA station history.
October · March · September
August · September · July
November · February · December
The weakest month is January, scoring 59 against October’s 84 — nights drop to 1.9°C, and days reach only 18.6°C, 5° below the 24°C the score treats as ideal.
Month by month
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 18.6°C | 1.9°C | 14 mm | 1.9 | 10 h 34 | 59 | Good coverage |
| February | 21.9°C | 4.1°C | 5 mm | 0.9 | 11 h 11 | 73 | Good coverage |
| March | 26.4°C | 7.1°C | 16 mm | 1.3 | 11 h 55 | 78 | Good coverage |
| April | 29.8°C | 10.6°C | 12 mm | 1.7 | 12 h 47 | 73 | Good coverage |
| May | 32.6°C | 15°C | 33 mm | 3 | 13 h 29 | 72 | Good coverage |
| June | 33.8°C | 17.7°C | 58 mm | 3.9 | 13 h 52 | 59 | Good coverage |
| July | 33.1°C | 17.9°C | 52 mm | 3.8 | 13 h 43 | 62 | Good coverage |
| August | 32.6°C | 17.7°C | 32 mm | 3.9 | 13 h 07 | 66 | Good coverage |
| September | 30°C | 15.5°C | 44 mm | 3.4 | 12 h 17 | 77 | Good coverage |
| October | 26.7°C | 11.2°C | 21 mm | 2.4 | 11 h 28 | 84 | Good coverage |
| November | 21.2°C | 6°C | 16 mm | 1.2 | 10 h 45 | 74 | Good coverage |
| December | 18.7°C | 2°C | 12 mm | 1.8 | 10 h 25 | 59 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 30.0°C7 Jan 1989 | -9.4°C13 Jan 1962 | 59 mm7 Jan 1993 | 59 mm1993 · driest 0 mm in 1988 | 50 |
| February | 36.7°C15 Feb 1987 | -11.1°C4 Feb 2011 | 25 mm8 Feb 1973 | 66 mm1973 · driest 0 mm in 1974 | 47 |
| March | 38.9°C15 Mar 1987 | -5.0°C2 Mar 1987 | 93 mm29 Mar 2012 | 105 mm2012 · driest 0 mm in 1963 | 46 |
| April | 42.8°C19 Apr 1987 | 0.0°C2 Apr 1984 | 68 mm14 Apr 1981 | 130 mm1981 · driest 0 mm in 1998 | 49 |
| May | 42.8°C25 May 1984 | 0.6°C21 May 1984 | 104 mm26 May 1975 | 117 mm1975 · driest 0 mm in 2003 | 50 |
| June | 42.8°C3 Jun 1998 | 5.0°C1 Jun 2001 | 110 mm30 Jun 2006 | 224 mm2004 · driest 0 mm in 1984 | 51 |
| July | 41.7°C1 Jul 1994 | 6.7°C15 Jul 1986 | 135 mm19 Jul 1960 | 295 mm1960 · driest 0 mm in 1992 | 51 |
| August | 45.6°C9 Aug 1986 | 10.0°C29 Aug 1984 | 60 mm27 Aug 1960 | 160 mm1960 · driest 0 mm in 1984 | 51 |
| September | 40.0°C10 Sep 1986 | 1.7°C17 Sep 1986 | 70 mm8 Sep 1960 | 153 mm1960 · driest 0 mm in 1963 | 50 |
| October | 38.9°C4 Oct 1989 | -4.4°C31 Oct 1993 | 56 mm11 Oct 1981 | 104 mm1981 · driest 0 mm in 1991 | 51 |
| November | 35.0°C2 Nov 1984 | -5.0°C23 Nov 1979 | 94 mm24 Nov 2012 | 96 mm2012 · driest 0 mm in 1967 | 50 |
| December | 33.9°C4 Dec 2005 | -12.2°C25 Dec 1983 | 24 mm11 Dec 1976 | 69 mm1992 · driest 0 mm in 1993 | 49 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 5 | <1 | 9 | <1 |
| February | 11 | 3 | 4 | <1 |
| March | 21 | 12 | 2 | <1 |
| April | 24 | 18 | 0 | <1 |
| May | 27 | 23 | 0 | 1 |
| June | 28 | 25 | 0 | 2 |
| July | 28 | 24 | 0 | 2 |
| August | 29 | 25 | 0 | 1 |
| September | 25 | 18 | 0 | 2 |
| October | 21 | 10 | <1 | <1 |
| November | 10 | <1 | 2 | <1 |
| December | 5 | <1 | 8 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 53% | 6% | 1% | 4% | 14.9–22.7°C |
| February | 71% | 3% | <1% | <1% | 18.2–26.1°C |
| March | 89% | 3% | <1% | 1% | 23.4–29.6°C |
| April | 92% | 6% | 2% | 3% | 26.5–33.0°C |
| May | 90% | 10% | 3% | 5% | 28.4–36.5°C |
| June | 88% | 12% | 4% | 8% | 30.6–35.6°C |
| July | 88% | 12% | 4% | 11% | 29.9–35.8°C |
| August | 88% | 12% | 3% | 9% | 29.9–34.4°C |
| September | 85% | 14% | 6% | 11% | 26.6–32.8°C |
| October | 89% | 8% | 2% | 3% | 23.3–30.6°C |
| November | 78% | 4% | 1% | 2% | 17.6–25.6°C |
| December | 55% | 7% | 1% | 4% | 14.9–22.4°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.
The evidence behind this page