September
September · June · August
United States · 1991–2020
September leads for comfortable weather in Berkley: typically 26.2°C by day, 7.4°C at night, with 35 mm of rain. Based on measured 1991–2020 NOAA station history.
September · June · August
August · July · June
October · May · September
The weakest month is December, scoring 5 against September’s 77 — days reach only 8.2°C, 16° below the 24°C the score treats as ideal, and nights drop to -8.2°C.
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 | 8.7°C | -7.9°C | 16 mm | 3.7 | 9 h 38 | 8 | Strong coverage |
| February | 9.4°C | -7.2°C | 20 mm | 4.2 | 10 h 38 | 11 | Strong coverage |
| March | 13.8°C | -3.2°C | 38 mm | 5.2 | 11 h 49 | 31 | Strong coverage |
| April | 16.9°C | 0.4°C | 57 mm | 6.9 | 13 h 12 | 44 | Strong coverage |
| May | 21.9°C | 5.8°C | 68 mm | 7.7 | 14 h 21 | 68 | Strong coverage |
| June | 28.2°C | 10.5°C | 42 mm | 6 | 14 h 58 | 74 | Strong coverage |
| July | 31.5°C | 13.7°C | 48 mm | 6.1 | 14 h 44 | 68 | Strong coverage |
| August | 30.2°C | 12.3°C | 42 mm | 5.5 | 13 h 44 | 72 | Strong coverage |
| September | 26.2°C | 7.4°C | 35 mm | 5.1 | 12 h 24 | 77 | Strong coverage |
| October | 18.9°C | 0.9°C | 31 mm | 4.4 | 11 h 05 | 57 | Strong coverage |
| November | 12.8°C | -4.2°C | 24 mm | 4.2 | 9 h 56 | 27 | Strong coverage |
| December | 8.2°C | -8.2°C | 16 mm | 3.8 | 9 h 22 | 5 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 25.6°C26 Jan 1982 | -29.4°C18 Jan 1984 | 18 mm19 Jan 1990 | 35 mm2019 · driest 2 mm in 2020 | 43 |
| February | 26.1°C11 Feb 2017 | -30.6°C5 Feb 1989 | 35 mm4 Feb 2024 | 64 mm2024 · driest 0 mm in 1992 | 45 |
| March | 31.7°C22 Mar 2026 | -22.2°C2 Mar 2002 | 73 mm18 Mar 2003 | 134 mm1983 · driest 1 mm in 2012 | 44 |
| April | 33.3°C30 Apr 1992 | -15.6°C12 Apr 1997 | 57 mm24 Apr 1997 | 170 mm1999 · driest 2 mm in 2002 | 44 |
| May | 36.1°C30 May 2003 | -7.2°C2 May 2013 | 65 mm12 May 2023 | 158 mm2015 · driest 15 mm in 2006 | 44 |
| June | 39.4°C26 Jun 2012 | 0.6°C6 Jun 1998 | 92 mm3 Jun 1981 | 123 mm2023 · driest 5 mm in 1990 | 44 |
| July | 40.0°C21 Jul 2026 | 4.4°C13 Jul 1987 | 79 mm14 Jul 2013 | 124 mm2013 · driest 4 mm in 2008 | 44 |
| August | 38.9°C16 Aug 2002 | 2.8°C27 Aug 1992 | 62 mm24 Aug 1992 | 111 mm2004 · driest 3 mm in 2020 | 43 |
| September | 37.8°C13 Sep 1990 | -10.0°C29 Sep 1985 | 75 mm10 Sep 2013 | 194 mm2013 · driest 0 mm in 1992 | 43 |
| October | 34.4°C16 Oct 1991 | -16.7°C29 Oct 1991 | 69 mm4 Oct 1984 | 156 mm1984 · driest 3 mm in 1988 | 43 |
| November | 28.9°C25 Nov 1990 | -22.2°C13 Nov 2014 | 24 mm5 Nov 2015 | 78 mm1983 · driest 1 mm in 2025 | 44 |
| December | 25.0°C23 Dec 2025 | -31.1°C22 Dec 1990 | 48 mm21 Dec 2006 | 81 mm2006 · driest 0 mm in 2018 | 44 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 6 |
| February | 0 | 0 | 27 | <1 | 6 |
| March | 1 | 0 | 25 | 1 | 6 |
| April | 4 | <1 | 14 | 2 | 5 |
| May | 12 | 2 | 2 | 2 | 1 |
| June | 23 | 13 | 0 | 1 | 0 |
| July | 30 | 22 | 0 | 2 | 0 |
| August | 28 | 20 | 0 | 1 | 0 |
| September | 20 | 10 | 1 | 1 | <1 |
| October | 8 | 1 | 13 | 1 | 2 |
| November | 1 | 0 | 26 | <1 | 5 |
| December | 0 | 0 | 30 | <1 | 6 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 3% | 12% | <1% | 6% | 5.5–10.7°C |
| February | 7% | 15% | 2% | 9% | 5.8–13.5°C |
| March | 21% | 17% | 4% | 13% | 10.9–17.1°C |
| April | 38% | 22% | 6% | 22% | 14.0–19.9°C |
| May | 59% | 26% | 7% | 28% | 20.1–24.1°C |
| June | 78% | 20% | 5% | 18% | 25.4–30.7°C |
| July | 81% | 20% | 5% | 19% | 30.0–33.1°C |
| August | 81% | 19% | 4% | 15% | 28.7–32.0°C |
| September | 78% | 16% | 4% | 13% | 24.0–28.6°C |
| October | 52% | 14% | 4% | 7% | 15.6–22.0°C |
| November | 20% | 13% | 3% | 7% | 9.9–15.9°C |
| December | 4% | 12% | 1% | 9% | 6.1–10.6°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