September
September · June · August
84climate match
United States · 1991–2020
Best time to visit
Genoa.
September leads for comfortable weather in Genoa: typically 24°C by day, 11.8°C at night, with 84 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24°C
Typical low11.8°C
Rain in September84 mm
July
July · August · June
71climate match
May
May · September · October
72climate match
The weakest month is January, scoring 5 against September’s 84 — days reach only -2.2°C, 26° 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
5-2.2° / -10.5°
Feb
50.3° / -8.6°
Mar
67.2° / -2.9°
Apr
3414.8° / 2.9°
May
6221.2° / 9.4°
Jun
7426.6° / 15.2°
Jul
6828.4° / 17.3°
Aug
7327.4° / 16.2°
Sep
8424° / 11.8°
Oct
4816.6° / 5°
Nov
117.9° / -1.4°
Dec
50.9° / -7.2°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -2.2°C | -10.5°C | 41 mm | 6.5 | 9 h 25 | 5 | Strong coverage |
| February | 0.3°C | -8.6°C | 43 mm | 6.1 | 10 h 30 | 5 | Strong coverage |
| March | 7.2°C | -2.9°C | 57 mm | 7.1 | 11 h 48 | 6 | Strong coverage |
| April | 14.8°C | 2.9°C | 90 mm | 9.7 | 13 h 17 | 34 | Strong coverage |
| May | 21.2°C | 9.4°C | 125 mm | 10.1 | 14 h 33 | 62 | Strong coverage |
| June | 26.6°C | 15.2°C | 116 mm | 9.1 | 15 h 14 | 74 | Strong coverage |
| July | 28.4°C | 17.3°C | 100 mm | 7.8 | 14 h 58 | 68 | Strong coverage |
| August | 27.4°C | 16.2°C | 103 mm | 7.2 | 13 h 53 | 73 | Strong coverage |
| September | 24°C | 11.8°C | 84 mm | 7.1 | 12 h 26 | 84 | Strong coverage |
| October | 16.6°C | 5°C | 76 mm | 7.5 | 11 h | 48 | Strong coverage |
| November | 7.9°C | -1.4°C | 58 mm | 6.6 | 9 h 44 | 11 | Strong coverage |
| December | 0.9°C | -7.2°C | 51 mm | 7.1 | 9 h 07 | 5 | Strong coverage |
What has changed
Genoa runs -0.2°C
on the 1961–1990 baseline.
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.
Jan
+0.7
Feb
-0.5
Mar
+0.1
Apr
-1.3
May
-0.7
Jun
-0.4
Jul
-1.2
Aug
-0.6
Sep
0.0
Oct
-0.2
Nov
-0.3
Dec
+1.5
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 17.2°C24 Jan 1967 | -32.8°C20 Jan 1985 | 38 mm17 Jan 2017 | 104 mm1974 · driest 2 mm in 1981 | 57 |
| February | 23.9°C28 Feb 2024 | -32.2°C1 Feb 2019 | 66 mm21 Feb 1997 | 124 mm1997 · driest 2 mm in 1987 | 60 |
| March | 28.9°C30 Mar 1986 | -25.0°C4 Mar 2002 | 49 mm28 Mar 2020 | 162 mm1976 · driest 1 mm in 1969 | 61 |
| April | 33.3°C26 Apr 1986 | -13.3°C7 Apr 1982 | 102 mm18 Apr 2013 | 210 mm2013 · driest 20 mm in 2018 | 61 |
| May | 35.6°C28 May 2018 | -4.4°C7 May 1989 | 71 mm21 May 2004 | 265 mm2004 · driest 22 mm in 1992 | 60 |
| June | 38.3°C26 Jun 1988 | 1.1°C1 Jun 1993 | 78 mm2 Jun 1970 | 251 mm1993 · driest 8 mm in 1988 | 60 |
| July | 38.9°C14 Jul 1995 | 6.1°C6 Jul 1967 | 206 mm18 Jul 1996 | 290 mm1996 · driest 17 mm in 2002 | 60 |
| August | 39.4°C17 Aug 1988 | 3.9°C28 Aug 1986 | 145 mm14 Aug 1987 | 362 mm1987 · driest 18 mm in 2020 | 58 |
| September | 34.4°C5 Sep 2012 | -2.8°C27 Sep 1991 | 88 mm28 Sep 1999 | 294 mm1970 · driest 1 mm in 1979 | 57 |
| October | 31.7°C8 Oct 2007 | -10.6°C30 Oct 1988 | 76 mm11 Oct 1969 | 220 mm2017 · driest 14 mm in 2005 | 58 |
| November | 24.4°C2 Nov 2000 | -22.2°C29 Nov 1976 | 56 mm11 Nov 1995 | 178 mm1985 · driest 9 mm in 1999 | 59 |
| December | 20.6°C4 Dec 2012 | -30.0°C24 Dec 1983 | 52 mm10 Dec 2003 | 149 mm2008 · driest 9 mm in 1976 | 59 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | 1 | 7 |
| February | 0 | 0 | 26 | 1 | 5 |
| March | <1 | 0 | 23 | 2 | 3 |
| April | 2 | <1 | 8 | 3 | <1 |
| May | 9 | 2 | <1 | 4 | 0 |
| June | 21 | 8 | 0 | 4 | 0 |
| July | 27 | 11 | 0 | 3 | 0 |
| August | 24 | 7 | 0 | 3 | 0 |
| September | 14 | 4 | <1 | 3 | 0 |
| October | 3 | <1 | 6 | 2 | <1 |
| November | 0 | 0 | 19 | 2 | 2 |
| December | 0 | 0 | 28 | 2 | 6 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 21% | 3% | 18% | -6.0–0.9°C |
| February | <1% | 20% | 4% | 17% | -3.5–4.6°C |
| March | 4% | 24% | 6% | 26% | 4.6–10.6°C |
| April | 18% | 31% | 10% | 39% | 12.5–18.1°C |
| May | 45% | 31% | 12% | 39% | 19.0–24.4°C |
| June | 67% | 30% | 13% | 34% | 25.0–28.7°C |
| July | 75% | 25% | 10% | 24% | 26.7–30.7°C |
| August | 75% | 24% | 11% | 24% | 25.9–29.4°C |
| September | 63% | 24% | 10% | 25% | 22.4–26.0°C |
| October | 27% | 24% | 8% | 26% | 14.5–19.4°C |
| November | 3% | 24% | 7% | 23% | 5.0–11.1°C |
| December | 0% | 23% | 5% | 22% | -2.3–4.5°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
Nearby, measured,
and named.
- Place identity
- GeoNames 4893601
- NOAA station
- USC00112223 · DE KALB
- Station distance
- 19.4 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 42.10°, 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.