September
September · May · June
United States · 1991–2020
September leads for comfortable weather in Bangor: typically 27°C by day, 13.4°C at night, with 99 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · June
August · June · July
October · April · May
The weakest month is January, scoring 5 against September’s 74 — days reach only 6°C, 18° 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 | 6°C | -4.3°C | 92 mm | 10.3 | 9 h 47 | 5 | Strong coverage |
| February | 8.3°C | -3.1°C | 91 mm | 9.4 | 10 h 43 | 5 | Strong coverage |
| March | 13.6°C | 0.7°C | 117 mm | 10.9 | 11 h 50 | 21 | Strong coverage |
| April | 20.4°C | 5.9°C | 118 mm | 11.5 | 13 h 08 | 52 | Strong coverage |
| May | 24.6°C | 11.3°C | 132 mm | 11.8 | 14 h 12 | 70 | Strong coverage |
| June | 28.7°C | 15.9°C | 121 mm | 10.5 | 14 h 47 | 64 | Strong coverage |
| July | 30.5°C | 18.1°C | 152 mm | 10.7 | 14 h 34 | 50 | Strong coverage |
| August | 30.1°C | 17.2°C | 100 mm | 8.6 | 13 h 38 | 62 | Strong coverage |
| September | 27°C | 13.4°C | 99 mm | 7.4 | 12 h 23 | 74 | Strong coverage |
| October | 20.9°C | 7°C | 86 mm | 8.7 | 11 h 08 | 63 | Strong coverage |
| November | 14.1°C | 1.6°C | 81 mm | 8.9 | 10 h 04 | 31 | Strong coverage |
| December | 8.2°C | -1.6°C | 104 mm | 10.5 | 9 h 32 | 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 | 26.7°C24 Jan 1943 | -33.3°C28 Jan 1963 | 77 mm3 Jan 1924 | 315 mm1937 · driest 15 mm in 2026 | 121 |
| February | 27.2°C10 Feb 1932 | -28.3°C27 Feb 1934 | 69 mm14 Feb 1989 | 247 mm1989 · driest 12 mm in 1941 | 121 |
| March | 32.8°C25 Mar 1929 | -22.8°C6 Mar 1960 | 110 mm20 Mar 2002 | 282 mm1997 · driest 11 mm in 2025 | 122 |
| April | 36.7°C24 Apr 1925 | -10.6°C1 Apr 1923 | 126 mm30 Apr 1909 | 318 mm2011 · driest 22 mm in 1915 | 121 |
| May | 36.1°C27 May 1911 | -3.9°C10 May 1966 | 174 mm3 May 2010 | 317 mm2010 · driest 19 mm in 1911 | 119 |
| June | 40.0°C29 Jun 1936 | 1.1°C26 Jun 1926 | 104 mm19 Jun 1916 | 256 mm1935 · driest 12 mm in 1913 | 122 |
| July | 40.6°C31 Jul 1999 | 5.0°C13 Jul 1917 | 116 mm30 Jul 2021 | 321 mm2015 · driest 41 mm in 1952 | 118 |
| August | 41.1°C19 Aug 1936 | 1.7°C30 Aug 1986 | 106 mm4 Aug 1972 | 229 mm1974 · driest 0 mm in 1919 | 118 |
| September | 39.4°C1 Sep 1932 | -4.4°C26 Sep 1928 | 142 mm10 Sep 2018 | 445 mm2018 · driest 5 mm in 1998 | 121 |
| October | 35.6°C9 Oct 2007 | -10.6°C29 Oct 1925 | 114 mm2 Oct 1911 | 242 mm1926 · driest 3 mm in 1963 | 119 |
| November | 29.4°C3 Nov 2004 | -21.7°C30 Nov 1929 | 104 mm1 Nov 1919 | 236 mm1919 · driest 6 mm in 1904 | 119 |
| December | 26.1°C4 Dec 1982 | -31.1°C24 Dec 1989 | 98 mm9 Dec 1978 | 290 mm1978 · driest 4 mm in 1925 | 120 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 23 | 3 | 3 |
| February | <1 | 0 | 21 | 3 | 3 |
| March | 2 | <1 | 15 | 4 | 1 |
| April | 9 | 1 | 5 | 4 | <1 |
| May | 17 | 5 | <1 | 4 | 0 |
| June | 26 | 13 | 0 | 4 | 0 |
| July | 30 | 19 | 0 | 5 | 0 |
| August | 29 | 17 | 0 | 3 | 0 |
| September | 21 | 9 | <1 | 3 | 0 |
| October | 9 | 1 | 3 | 3 | 0 |
| November | 1 | 0 | 13 | 3 | <1 |
| December | <1 | 0 | 20 | 4 | 2 |
The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 80); on 2011–2025 it is May (82). 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 | 2% | 33% | 11% | 40% | 2.7–10.8°C |
| February | 4% | 32% | 10% | 40% | 4.5–12.7°C |
| March | 17% | 34% | 13% | 44% | 10.2–18.1°C |
| April | 39% | 34% | 12% | 44% | 17.6–23.0°C |
| May | 58% | 34% | 13% | 45% | 22.3–27.4°C |
| June | 67% | 32% | 13% | 39% | 27.0–31.4°C |
| July | 68% | 32% | 15% | 39% | 29.2–32.7°C |
| August | 73% | 27% | 12% | 28% | 28.2–32.3°C |
| September | 74% | 23% | 10% | 22% | 25.0–29.9°C |
| October | 52% | 24% | 8% | 27% | 19.0–23.7°C |
| November | 17% | 28% | 10% | 33% | 11.6–17.1°C |
| December | 3% | 31% | 11% | 39% | 5.1–12.0°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