January
January · December · February
Mexico · 1991–2020
January leads for comfortable weather in San José: typically 24.8°C by day, 13.4°C at night, with 21 mm of rain. Based on measured 1991–2020 NOAA station history.
January · December · February
March · April · November
January · December · February
The weakest month is June, scoring 24 against January’s 95 — days average 35.4°C, 11° above 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 | 24.8°C | 13.4°C | 21 mm | 2.8 | 10 h 53 | 95 | Good coverage |
| February | 26.9°C | 14.6°C | 22 mm | 2.1 | 11 h 22 | 90 | Good coverage |
| March | 30.4°C | 17.3°C | 17 mm | 2.3 | 11 h 57 | 75 | Good coverage |
| April | 33.2°C | 20°C | 27 mm | 2.4 | 12 h 39 | 61 | Good coverage |
| May | 35.4°C | 22.7°C | 48 mm | 3.7 | 13 h 13 | 46 | Good coverage |
| June | 35.4°C | 23.9°C | 157 mm | 8.9 | 13 h 31 | 24 | Good coverage |
| July | 34.2°C | 23.6°C | 150 mm | 8.9 | 13 h 24 | 30 | Good coverage |
| August | 34.8°C | 23.8°C | 130 mm | 8.5 | 12 h 55 | 30 | Good coverage |
| September | 33.3°C | 22.8°C | 150 mm | 9.6 | 12 h 15 | 33 | Good coverage |
| October | 31.2°C | 20.2°C | 89 mm | 5.8 | 11 h 35 | 57 | Good coverage |
| November | 27.9°C | 16.5°C | 24 mm | 2.6 | 11 h 01 | 84 | Good coverage |
| December | 25°C | 13.9°C | 13 mm | 1.8 | 10 h 45 | 95 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 36.7°C3 Jan 1982 | 0.0°C14 Jan 1975 | 76 mm22 Jan 1994 | 132 mm1994 · driest 0 mm in 1998 | 39 |
| February | 38.3°C11 Feb 1995 | 0.0°C4 Feb 2011 | 49 mm24 Feb 2005 | 102 mm2012 · driest 0 mm in 2011 | 38 |
| March | 43.3°C27 Mar 1976 | 5.6°C8 Mar 1982 | 37 mm31 Mar 2007 | 68 mm1992 · driest 0 mm in 1989 | 39 |
| April | 45.0°C20 Apr 1973 | 8.3°C1 Apr 1987 | 77 mm20 Apr 1979 | 249 mm1985 · driest 0 mm in 1998 | 39 |
| May | 46.7°C27 May 1973 | 10.6°C1 May 1996 | 82 mm21 May 1978 | 221 mm1982 · driest 0 mm in 1998 | 39 |
| June | 43.9°C5 Jun 1998 | 17.8°C9 Jun 1973 | 202 mm30 Jun 2011 | 637 mm1993 · driest 31 mm in 1983 | 39 |
| July | 40.0°C16 Jul 2007 | 15.0°C2 Jul 2007 | 162 mm3 Jul 1974 | 603 mm1976 · driest 5 mm in 1980 | 39 |
| August | 40.0°C29 Aug 2005 | 19.4°C31 Aug 1994 | 139 mm24 Aug 1996 | 354 mm2007 · driest 17 mm in 1974 | 40 |
| September | 39.4°C4 Sep 2002 | 10.0°C28 Sep 2000 | 170 mm21 Sep 1974 | 329 mm1993 · driest 30 mm in 1997 | 39 |
| October | 38.3°C16 Oct 1984 | 7.8°C25 Oct 2007 | 86 mm2 Oct 1977 | 226 mm2003 · driest 0 mm in 1979 | 38 |
| November | 38.9°C26 Nov 1988 | 2.8°C26 Nov 1974 | 65 mm27 Nov 1985 | 81 mm2001 · driest 0 mm in 1974 | 38 |
| December | 35.0°C31 Dec 1973 | -4.4°C25 Dec 1989 | 117 mm3 Dec 1979 | 196 mm1979 · driest 0 mm in 2001 | 39 |
| Month | Days 25°C+ | Days 30°C+ | Heavy rain (10 mm+) |
|---|---|---|---|
| January | 19 | 3 | <1 |
| February | 22 | 9 | <1 |
| March | 28 | 21 | <1 |
| April | 29 | 26 | <1 |
| May | 31 | 31 | 2 |
| June | 30 | 28 | 5 |
| July | 31 | 29 | 4 |
| August | 31 | 30 | 4 |
| September | 30 | 28 | 4 |
| October | 30 | 24 | 3 |
| November | 25 | 13 | <1 |
| December | 19 | 3 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 80% | 9% | 2% | 6% | 22.4–26.7°C |
| February | 87% | 7% | 2% | 2% | 24.8–29.3°C |
| March | 93% | 6% | 1% | 4% | 28.8–32.4°C |
| April | 91% | 9% | 3% | 6% | 31.3–35.1°C |
| May | 86% | 14% | 7% | 12% | 33.1–36.8°C |
| June | 72% | 28% | 15% | 38% | 33.1–36.6°C |
| July | 69% | 31% | 15% | 32% | 32.4–36.0°C |
| August | 72% | 28% | 12% | 35% | 32.6–35.9°C |
| September | 69% | 31% | 14% | 36% | 31.4–34.6°C |
| October | 84% | 16% | 7% | 14% | 29.8–32.7°C |
| November | 89% | 8% | 2% | 3% | 26.1–29.8°C |
| December | 81% | 7% | 2% | 3% | 23.4–26.2°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