September
September · June · August
United States · 1991–2020
September leads for comfortable weather in Somerset: typically 24.3°C by day, 10.9°C at night, with 106 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 78 — days reach only 3.6°C, 20° 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 | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | 3.6°C | -6.8°C | 86 mm | 9 | 4.8°C | 9 h 27 | 5 | Good coverage |
| February | 5°C | -5.9°C | 85 mm | 8.2 | 2.8°C | 10 h 31 | 5 | Good coverage |
| March | 8.9°C | -2.4°C | 129 mm | 9.3 | 3.5°C | 11 h 48 | 5 | Good coverage |
| April | 15.2°C | 2.5°C | 115 mm | 9.7 | 6.9°C | 13 h 17 | 31 | Good coverage |
| May | 20.9°C | 8°C | 88 mm | 9.8 | 11.5°C | 14 h 31 | 64 | Good coverage |
| June | 25.5°C | 12.9°C | 109 mm | 8.5 | 16.2°C | 15 h 12 | 76 | Good coverage |
| July | 29°C | 16.3°C | 84 mm | 7.3 | 20.2°C | 14 h 56 | 71 | Good coverage |
| August | 28.3°C | 15.2°C | 85 mm | 7.4 | 21.2°C | 13 h 51 | 75 | Good coverage |
| September | 24.3°C | 10.9°C | 106 mm | 7.4 | 19.6°C | 12 h 26 | 78 | Good coverage |
| October | 17.8°C | 5.2°C | 119 mm | 9.1 | 16.4°C | 11 h 00 | 45 | Good coverage |
| November | 12.2°C | 0.4°C | 102 mm | 8.2 | 12.2°C | 9 h 46 | 21 | Good coverage |
| December | 6.6°C | -3.9°C | 110 mm | 9.7 | 8.1°C | 9 h 09 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.7°C12 Jan 2020 | -24.4°C22 Jan 2005 | 58 mm10 Jan 2024 | 201 mm2024 · driest 41 mm in 2004 | 28 |
| February | 21.1°C23 Feb 2022 | -26.6°C21 Feb 2015 | 53 mm13 Feb 2008 | 154 mm2008 · driest 30 mm in 2012 | 28 |
| March | 28.9°C31 Mar 1998 | -21.0°C1 Mar 2015 | 107 mm30 Mar 2010 | 385 mm2010 · driest 13 mm in 2006 | 28 |
| April | 34.4°C17 Apr 2002 | -9.9°C6 Apr 2016 | 60 mm30 Apr 2023 | 197 mm2007 · driest 36 mm in 1999 | 29 |
| May | 35.6°C26 May 2010 | -2.8°C7 May 2001 | 79 mm22 May 2025 | 195 mm2006 · driest 36 mm in 2008 | 29 |
| June | 38.3°C24 Jun 2025 | 2.2°C2 Jun 2026 | 124 mm7 Jun 2006 | 357 mm2006 · driest 2 mm in 1999 | 29 |
| July | 37.8°C22 Jul 2011 | 6.1°C12 Jul 2002 | 71 mm4 Jul 2014 | 211 mm2009 · driest 30 mm in 1998 | 29 |
| August | 39.4°C5 Aug 2005 | 5.6°C28 Aug 2017 | 86 mm8 Aug 2003 | 199 mm2021 · driest 25 mm in 2007 | 27 |
| September | 35.0°C7 Sep 2023 | -0.6°C30 Sep 2000 | 96 mm2 Sep 2021 | 240 mm2023 · driest 32 mm in 2014 | 27 |
| October | 31.1°C4 Oct 2023 | -7.1°C31 Oct 2020 | 113 mm15 Oct 2005 | 335 mm2005 · driest 20 mm in 2013 | 27 |
| November | 27.8°C1 Nov 2024 | -12.2°C25 Nov 2000 | 68 mm27 Nov 2013 | 246 mm2018 · driest 24 mm in 2001 | 27 |
| December | 24.4°C7 Dec 1998 | -19.3°C31 Dec 2017 | 73 mm11 Dec 2024 | 194 mm2019 · driest 45 mm in 2006 | 28 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 26 | 3 |
| February | 0 | 0 | 24 | 3 |
| March | <1 | 0 | 23 | 4 |
| April | 1 | <1 | 10 | 4 |
| May | 7 | 2 | 1 | 3 |
| June | 18 | 6 | 0 | 3 |
| July | 27 | 14 | 0 | 3 |
| August | 26 | 11 | 0 | 3 |
| September | 14 | 2 | <1 | 3 |
| October | 2 | <1 | 6 | 4 |
| November | 0 | 0 | 16 | 3 |
| December | 0 | 0 | 25 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 28% | 10% | 34% | 0.9–6.1°C |
| February | <1% | 29% | 10% | 36% | 1.9–7.5°C |
| March | 3% | 30% | 12% | 39% | 6.3–11.7°C |
| April | 16% | 32% | 13% | 37% | 12.8–17.0°C |
| May | 46% | 32% | 9% | 39% | 19.2–22.7°C |
| June | 68% | 28% | 10% | 30% | 24.1–27.4°C |
| July | 75% | 25% | 10% | 25% | 26.5–30.5°C |
| August | 76% | 24% | 9% | 25% | 26.8–30.0°C |
| September | 67% | 25% | 11% | 29% | 23.0–25.4°C |
| October | 27% | 28% | 12% | 31% | 16.3–20.3°C |
| November | 5% | 27% | 10% | 32% | 10.3–14.4°C |
| December | <1% | 31% | 12% | 39% | 3.9–9.1°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