September
September · June · August
United States · 1991–2020
September leads for comfortable weather in Genoa: typically 23.7°C by day, 12.4°C at night, with 89 mm of rain. Based on measured 1991–2020 NOAA station history.
September · June · August
July · August · June
May · September · October
The weakest month is January, scoring 5 against September’s 83 — days reach only 1.3°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 | 1.3°C | -6.8°C | 74 mm | 12 | 9 h 33 | 5 | Strong coverage |
| February | 3°C | -5.9°C | 62 mm | 10.2 | 10 h 35 | 5 | Strong coverage |
| March | 8.4°C | -1.8°C | 82 mm | 10.7 | 11 h 49 | 5 | Strong coverage |
| April | 15.9°C | 4°C | 98 mm | 11.2 | 13 h 14 | 37 | Strong coverage |
| May | 21.7°C | 9.9°C | 105 mm | 11.4 | 14 h 26 | 66 | Strong coverage |
| June | 26.2°C | 14.9°C | 112 mm | 10 | 15 h 05 | 75 | Strong coverage |
| July | 28.4°C | 17.1°C | 105 mm | 9.2 | 14 h 49 | 66 | Strong coverage |
| August | 27.5°C | 16.3°C | 92 mm | 7.7 | 13 h 48 | 74 | Strong coverage |
| September | 23.7°C | 12.4°C | 89 mm | 7.6 | 12 h 25 | 83 | Strong coverage |
| October | 16.8°C | 6.4°C | 85 mm | 9.4 | 11 h 03 | 48 | Strong coverage |
| November | 9.7°C | 0.9°C | 78 mm | 9.4 | 9 h 51 | 16 | Strong coverage |
| December | 3.7°C | -3.6°C | 74 mm | 11 | 9 h 16 | 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 | 21.1°C25 Jan 1950 | -31.7°C19 Jan 1994 | 72 mm21 Jan 1959 | 221 mm1950 · driest 18 mm in 1961 | 78 |
| February | 24.4°C24 Feb 2017 | -25.0°C17 Feb 1979 | 52 mm25 Feb 1956 | 146 mm2008 · driest 8 mm in 1987 | 78 |
| March | 28.3°C22 Mar 2012 | -19.4°C2 Mar 1980 | 82 mm9 Mar 1964 | 224 mm1964 · driest 27 mm in 1958 | 78 |
| April | 31.1°C28 Apr 1986 | -12.2°C1 Apr 1964 | 54 mm15 Apr 2018 | 164 mm1981 · driest 23 mm in 1971 | 78 |
| May | 33.9°C29 May 1991 | -4.4°C10 May 1966 | 67 mm27 May 1956 | 244 mm1956 · driest 27 mm in 1977 | 78 |
| June | 37.8°C26 Jun 1952 | 0.0°C11 Jun 1972 | 72 mm15 Jun 1970 | 236 mm2014 · driest 9 mm in 1988 | 78 |
| July | 38.3°C16 Jul 1988 | 6.1°C1 Jul 1988 | 123 mm19 Jul 2011 | 319 mm2003 · driest 17 mm in 1991 | 79 |
| August | 36.7°C30 Aug 1953 | 5.0°C29 Aug 1982 | 108 mm3 Aug 2024 | 208 mm1974 · driest 5 mm in 2025 | 78 |
| September | 37.2°C3 Sep 1953 | 0.0°C21 Sep 1956 | 94 mm3 Sep 1988 | 229 mm1990 · driest 5 mm in 1960 | 78 |
| October | 32.8°C1 Oct 2019 | -6.7°C20 Oct 1952 | 65 mm15 Oct 1954 | 214 mm1954 · driest 11 mm in 1953 | 78 |
| November | 26.7°C3 Nov 1961 | -18.3°C30 Nov 1958 | 77 mm18 Nov 2017 | 239 mm1985 · driest 16 mm in 1976 | 78 |
| December | 24.4°C3 Dec 1982 | -26.7°C22 Dec 1989 | 43 mm16 Dec 2000 | 171 mm1990 · driest 8 mm in 1955 | 78 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 27 | 2 | 13 |
| February | 0 | 0 | 24 | 2 | 10 |
| March | <1 | 0 | 20 | 3 | 7 |
| April | 3 | 0 | 8 | 3 | 2 |
| May | 10 | 2 | <1 | 3 | 0 |
| June | 20 | 6 | 0 | 4 | 0 |
| July | 27 | 11 | 0 | 3 | 0 |
| August | 25 | 8 | 0 | 3 | 0 |
| September | 13 | 3 | 0 | 3 | 0 |
| October | 3 | <1 | 3 | 3 | <1 |
| November | <1 | 0 | 14 | 2 | 4 |
| December | 0 | 0 | 24 | 2 | 9 |
The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 85); on 2011–2025 it is September (88). 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 | 0% | 36% | 6% | 49% | -2.4–4.6°C |
| February | <1% | 34% | 6% | 44% | -0.6–6.1°C |
| March | 5% | 36% | 9% | 52% | 5.1–12.0°C |
| April | 19% | 38% | 10% | 52% | 13.1–17.7°C |
| May | 42% | 35% | 11% | 48% | 18.8–24.4°C |
| June | 65% | 31% | 11% | 37% | 24.3–27.8°C |
| July | 70% | 30% | 11% | 33% | 26.5–30.2°C |
| August | 74% | 25% | 9% | 25% | 25.5–29.0°C |
| September | 61% | 25% | 9% | 27% | 21.6–25.7°C |
| October | 26% | 27% | 8% | 31% | 14.4–19.5°C |
| November | 4% | 33% | 8% | 42% | 6.7–12.4°C |
| December | <1% | 36% | 7% | 49% | -0.5–6.6°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