September
September · June · May
United States · 1991–2020
September leads for comfortable weather in Lima: typically 25.6°C by day, 13°C at night, with 88 mm of rain. Based on measured 1991–2020 NOAA station history.
September · June · May
July · August · June
October · September · April
The weakest month is January, scoring 5 against September’s 81 — days reach only 1.4°C, 23° 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 | 1.4°C | -8.3°C | 40 mm | 4.4 | 9 h 36 | 5 | Strong coverage |
| February | 4.1°C | -6.4°C | 45 mm | 5.6 | 10 h 37 | 5 | Strong coverage |
| March | 10.7°C | -0.9°C | 62 mm | 6.5 | 11 h 49 | 21 | Strong coverage |
| April | 17.5°C | 5.2°C | 104 mm | 9.5 | 13 h 13 | 45 | Strong coverage |
| May | 22.8°C | 11.6°C | 146 mm | 10.8 | 14 h 23 | 67 | Strong coverage |
| June | 27.8°C | 17°C | 118 mm | 8.2 | 15 h 01 | 68 | Strong coverage |
| July | 29.9°C | 19°C | 99 mm | 7.7 | 14 h 46 | 60 | Strong coverage |
| August | 29.1°C | 17.8°C | 104 mm | 6.8 | 13 h 45 | 65 | Strong coverage |
| September | 25.6°C | 13°C | 88 mm | 5.5 | 12 h 24 | 81 | Strong coverage |
| October | 18.9°C | 6.4°C | 89 mm | 6.7 | 11 h 04 | 57 | Strong coverage |
| November | 11°C | 0°C | 68 mm | 6.3 | 9 h 54 | 23 | Strong coverage |
| December | 4.2°C | -5.3°C | 46 mm | 5.2 | 9 h 19 | 5 | Strong coverage |
What has changed
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 22.2°C24 Jan 1950 | -28.9°C11 Jan 1982 | 77 mm2 Jan 1965 | 206 mm1965 · driest 2 mm in 1986 | 89 |
| February | 26.7°C28 Feb 2024 | -28.9°C9 Feb 1979 | 57 mm20 Feb 2018 | 104 mm2008 · driest 1 mm in 2026 | 88 |
| March | 31.7°C30 Mar 1986 | -23.3°C5 Mar 1978 | 111 mm4 Mar 1985 | 181 mm1973 · driest 10 mm in 1956 | 89 |
| April | 35.0°C26 Apr 1986 | -10.0°C2 Apr 2018 | 105 mm18 Apr 2013 | 223 mm2024 · driest 19 mm in 1971 | 89 |
| May | 37.8°C22 May 1988 | -1.1°C4 May 2005 | 137 mm27 May 1973 | 332 mm1991 · driest 14 mm in 2023 | 88 |
| June | 39.4°C15 Jun 1987 | 5.6°C3 Jun 1946 | 114 mm14 Jun 1990 | 401 mm2011 · driest 7 mm in 1992 | 89 |
| July | 43.3°C30 Jul 1980 | 9.4°C14 Jul 1975 | 127 mm31 Jul 1985 | 298 mm2010 · driest 16 mm in 1975 | 88 |
| August | 42.2°C19 Aug 1988 | 6.1°C20 Aug 1950 | 127 mm8 Aug 1943 | 376 mm1970 · driest 0 mm in 2013 | 88 |
| September | 40.0°C6 Sep 1990 | -2.8°C28 Sep 1942 | 167 mm20 Sep 1986 | 461 mm1986 · driest 0 mm in 2017 | 89 |
| October | 36.1°C7 Oct 1939 | -7.8°C29 Oct 1952 | 123 mm5 Oct 1955 | 269 mm1941 · driest 4 mm in 1964 | 89 |
| November | 27.8°C11 Nov 1949 | -22.2°C30 Nov 1964 | 77 mm30 Nov 2006 | 225 mm1985 · driest 5 mm in 1959 | 89 |
| December | 23.9°C4 Dec 2012 | -27.8°C23 Dec 1989 | 78 mm10 Dec 2003 | 134 mm1982 · driest 2 mm in 1996 | 88 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 1 | 2 |
| February | 0 | 0 | 24 | 1 | 2 |
| March | 1 | 0 | 18 | 2 | <1 |
| April | 4 | <1 | 5 | 4 | <1 |
| May | 12 | 2 | <1 | 4 | 0 |
| June | 24 | 10 | 0 | 4 | 0 |
| July | 28 | 16 | 0 | 3 | 0 |
| August | 28 | 13 | 0 | 3 | 0 |
| September | 17 | 6 | 0 | 3 | 0 |
| October | 5 | <1 | 3 | 3 | 0 |
| November | <1 | 0 | 16 | 2 | <1 |
| December | 0 | 0 | 25 | 2 | 1 |
The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 85); on 2011–2025 it is September (84). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 17% | 4% | 13% | -1.8–5.4°C |
| February | 1% | 19% | 4% | 15% | -0.2–8.0°C |
| March | 10% | 24% | 8% | 26% | 7.3–14.3°C |
| April | 28% | 30% | 11% | 38% | 14.9–20.8°C |
| May | 54% | 31% | 12% | 38% | 20.6–26.2°C |
| June | 71% | 27% | 12% | 31% | 26.0–30.6°C |
| July | 76% | 23% | 10% | 22% | 28.6–33.2°C |
| August | 79% | 21% | 9% | 19% | 27.8–31.6°C |
| September | 73% | 21% | 10% | 20% | 23.8–28.3°C |
| October | 44% | 20% | 8% | 20% | 17.5–22.6°C |
| November | 10% | 20% | 7% | 19% | 8.0–14.2°C |
| December | <1% | 18% | 5% | 16% | 0.8–7.5°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.
The evidence behind this page