September
September · May · June
United States · 1991–2020
September leads for comfortable weather in Marysville: typically 24.5°C by day, 13.2°C at night, with 124 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · June
July · August · June
May · October · April
The weakest month is January, scoring 5 against September’s 79 — days reach only 2.6°C, 21° 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 | 2.6°C | -5.5°C | 69 mm | 8 | 9 h 35 | 5 | Good coverage |
| February | 4.1°C | -4.9°C | 69 mm | 7.2 | 10 h 36 | 5 | Good coverage |
| March | 9.5°C | -0.7°C | 87 mm | 7.5 | 11 h 49 | 12 | Good coverage |
| April | 16.4°C | 5°C | 98 mm | 10.2 | 13 h 13 | 42 | Good coverage |
| May | 22.4°C | 11°C | 112 mm | 11.2 | 14 h 24 | 69 | Good coverage |
| June | 27.2°C | 16.1°C | 117 mm | 10.2 | 15 h 02 | 69 | Good coverage |
| July | 29.9°C | 18.5°C | 119 mm | 9.1 | 14 h 47 | 57 | Good coverage |
| August | 28.5°C | 17.4°C | 116 mm | 9.1 | 13 h 46 | 64 | Good coverage |
| September | 24.5°C | 13.2°C | 124 mm | 7.2 | 12 h 25 | 79 | Good coverage |
| October | 17.4°C | 6.8°C | 104 mm | 8.8 | 11 h 04 | 49 | Good coverage |
| November | 11.1°C | 1.5°C | 69 mm | 7.1 | 9 h 53 | 25 | Good coverage |
| December | 5°C | -2.7°C | 91 mm | 8.4 | 9 h 18 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 19.4°C12 Jan 2020 | -20.6°C21 Jan 2025 | 57 mm10 Jan 2024 | 167 mm2024 · driest 15 mm in 2001 | 27 |
| February | 25.0°C22 Feb 2018 | -21.1°C6 Feb 2007 | 117 mm25 Feb 2005 | 146 mm2005 · driest 10 mm in 2002 | 27 |
| March | 28.3°C30 Mar 2025 | -15.6°C8 Mar 2007 | 70 mm5 Mar 2008 | 168 mm2001 · driest 18 mm in 2006 | 27 |
| April | 32.2°C18 Apr 2002 | -5.6°C20 Apr 2022 | 121 mm17 Apr 2011 | 302 mm2011 · driest 51 mm in 2001 | 27 |
| May | 33.9°C19 May 2026 | 0.0°C9 May 2020 | 90 mm3 May 2010 | 270 mm2025 · driest 28 mm in 2007 | 28 |
| June | 36.7°C30 Jun 2012 | 3.3°C2 Jun 2023 | 67 mm28 Jun 2006 | 247 mm2015 · driest 7 mm in 2026 | 28 |
| July | 40.0°C8 Jul 2012 | 7.8°C29 Jul 2017 | 87 mm5 Jul 2018 | 377 mm2018 · driest 22 mm in 1999 | 27 |
| August | 37.2°C1 Aug 1999 | 6.7°C24 Aug 2004 | 121 mm5 Aug 2017 | 278 mm2017 · driest 36 mm in 2006 | 28 |
| September | 34.4°C2 Sep 2010 | 0.6°C14 Sep 2002 | 140 mm18 Sep 2004 | 443 mm2011 · driest 19 mm in 2014 | 28 |
| October | 32.2°C3 Oct 2019 | -5.0°C26 Oct 2006 | 154 mm11 Oct 2013 | 226 mm2013 · driest 19 mm in 2024 | 27 |
| November | 27.2°C1 Nov 2024 | -10.0°C20 Nov 2022 | 61 mm22 Nov 2023 | 213 mm2018 · driest 25 mm in 2015 | 27 |
| December | 22.2°C2 Dec 2006 | -16.1°C24 Dec 2022 | 56 mm12 Dec 2008 | 197 mm2008 · driest 22 mm in 2021 | 27 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 26 | 2 | 4 |
| February | 0 | 0 | 24 | 2 | 4 |
| March | <1 | 0 | 18 | 3 | 2 |
| April | 3 | <1 | 4 | 3 | <1 |
| May | 11 | 3 | 0 | 4 | 0 |
| June | 22 | 9 | 0 | 4 | 0 |
| July | 29 | 16 | 0 | 4 | 0 |
| August | 28 | 11 | 0 | 3 | 0 |
| September | 14 | 3 | 0 | 4 | 0 |
| October | 3 | <1 | 2 | 3 | 0 |
| November | 0 | 0 | 12 | 3 | <1 |
| December | 0 | 0 | 24 | 3 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 26% | 7% | 28% | -0.1–6.0°C |
| February | <1% | 26% | 7% | 26% | 1.3–7.8°C |
| March | 7% | 26% | 9% | 28% | 6.6–13.2°C |
| April | 23% | 33% | 11% | 43% | 14.5–18.8°C |
| May | 47% | 36% | 13% | 50% | 20.0–24.8°C |
| June | 66% | 33% | 12% | 41% | 25.6–28.9°C |
| July | 70% | 30% | 13% | 37% | 27.7–32.0°C |
| August | 71% | 29% | 11% | 33% | 27.1–29.8°C |
| September | 69% | 24% | 12% | 25% | 23.3–26.5°C |
| October | 26% | 27% | 10% | 29% | 15.8–19.8°C |
| November | 5% | 23% | 8% | 23% | 8.5–13.7°C |
| December | <1% | 27% | 10% | 29% | 2.9–8.1°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