September
September · August · June
United States · 1991–2020
September leads for comfortable weather in Westport: typically 23.1°C by day, 8.9°C at night, with 71 mm of rain. Based on measured 1991–2020 NOAA station history.
September · August · June
July · August · June
September · May · October
The weakest month is January, scoring 5 against September’s 78 — days reach only -5.2°C, 29° 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 | -5.2°C | -16.5°C | 13 mm | 3.2 | 9 h 03 | 5 | Strong coverage |
| February | -2.4°C | -14.2°C | 14 mm | 3.1 | 10 h 17 | 5 | Strong coverage |
| March | 4.6°C | -6.8°C | 29 mm | 4.2 | 11 h 46 | 5 | Strong coverage |
| April | 13.9°C | 0°C | 54 mm | 6.4 | 13 h 27 | 34 | Strong coverage |
| May | 21.5°C | 7°C | 77 mm | 8.5 | 14 h 53 | 66 | Strong coverage |
| June | 26°C | 12.4°C | 110 mm | 10 | 15 h 41 | 72 | Strong coverage |
| July | 28.2°C | 14.7°C | 104 mm | 8.2 | 15 h 22 | 71 | Strong coverage |
| August | 27.3°C | 13.5°C | 93 mm | 6.8 | 14 h 07 | 75 | Strong coverage |
| September | 23.1°C | 8.9°C | 71 mm | 6.5 | 12 h 29 | 78 | Strong coverage |
| October | 15.1°C | 1.8°C | 64 mm | 6.8 | 10 h 51 | 40 | Strong coverage |
| November | 5.4°C | -5.8°C | 27 mm | 3.8 | 9 h 25 | 5 | Strong coverage |
| December | -2.4°C | -12.9°C | 15 mm | 3.7 | 8 h 42 | 5 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 11.1°C10 Jan 2012 | -40.6°C28 Jan 1951 | 43 mm31 Jan 1986 | 82 mm1969 · driest 1 mm in 1898 | 69 |
| February | 15.6°C27 Feb 2016 | -38.3°C1 Feb 1951 | 36 mm17 Feb 1982 | 44 mm1971 · driest 1 mm in 1960 | 70 |
| March | 25.6°C29 Mar 1986 | -35.6°C14 Mar 1897 | 55 mm4 Mar 1985 | 85 mm2009 · driest 2 mm in 1959 | 69 |
| April | 36.7°C21 Apr 1980 | -19.4°C1 Apr 1975 | 99 mm26 Apr 1954 | 221 mm1896 · driest 3 mm in 1980 | 70 |
| May | 36.7°C26 May 2018 | -10.0°C1 May 1966 | 88 mm30 May 1899 | 194 mm1899 · driest 6 mm in 2009 | 69 |
| June | 38.9°C24 Jun 1988 | -2.2°C6 Jun 1897 | 135 mm21 Jun 2013 | 224 mm2013 · driest 16 mm in 1988 | 69 |
| July | 39.4°C27 Jul 1988 | 4.4°C4 Jul 1967 | 137 mm10 Jul 2002 | 253 mm2002 · driest 21 mm in 2007 | 69 |
| August | 38.9°C16 Aug 1988 | -1.1°C31 Aug 1896 | 128 mm26 Aug 2005 | 230 mm2014 · driest 4 mm in 1969 | 70 |
| September | 36.1°C19 Sep 1895 | -6.1°C27 Sep 1993 | 90 mm30 Sep 1995 | 156 mm2007 · driest 0 mm in 1979 | 71 |
| October | 32.2°C2 Oct 1953 | -16.1°C31 Oct 1951 | 81 mm3 Oct 1990 | 219 mm1971 · driest 1 mm in 1952 | 69 |
| November | 25.0°C8 Nov 1999 | -30.0°C26 Nov 1996 | 53 mm9 Nov 1970 | 122 mm1970 · driest 0 mm in 1984 | 69 |
| December | 15.6°C1 Dec 1962 | -36.7°C19 Dec 1955 | 30 mm23 Dec 1968 | 72 mm1968 · driest 0 mm in 1975 | 69 |
| 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 | 4 |
| March | 0 | 0 | 26 | <1 | 4 |
| April | 2 | <1 | 16 | 2 | 1 |
| May | 9 | 2 | 3 | 3 | 0 |
| June | 19 | 5 | 0 | 4 | 0 |
| July | 26 | 10 | 0 | 3 | 0 |
| August | 24 | 7 | 0 | 3 | 0 |
| September | 12 | 2 | 2 | 2 | 0 |
| October | 2 | <1 | 12 | 2 | <1 |
| November | 0 | 0 | 26 | <1 | 3 |
| December | 0 | 0 | 30 | <1 | 6 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 11% | <1% | 5% | -10.2–-1.7°C |
| February | 0% | 11% | <1% | 6% | -6.8–1.9°C |
| March | 1% | 14% | 3% | 9% | -1.1–7.5°C |
| April | 17% | 22% | 6% | 23% | 9.5–17.4°C |
| May | 47% | 27% | 9% | 33% | 18.5–23.9°C |
| June | 64% | 31% | 12% | 38% | 23.5–28.1°C |
| July | 75% | 25% | 9% | 23% | 26.0–30.6°C |
| August | 75% | 23% | 10% | 23% | 25.0–29.3°C |
| September | 55% | 21% | 7% | 20% | 19.9–24.7°C |
| October | 21% | 19% | 6% | 16% | 12.1–17.1°C |
| November | 1% | 13% | 3% | 8% | 0.2–8.7°C |
| December | 0% | 11% | <1% | 6% | -7.0–0.4°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