September
September · August · June
United States · 1991–2020
September leads for comfortable weather in Salem: typically 24.3°C by day, 10.2°C at night, with 98 mm of rain. Based on measured 1991–2020 NOAA station history.
September · August · June
July · August · June
May · October · September
The weakest month is January, scoring 5 against September’s 77 — days reach only 2.3°C, 22° 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 | 2.3°C | -7.7°C | 80 mm | 10.8 | 9 h 32 | 5 | Good coverage |
| February | 4.2°C | -6.7°C | 62 mm | 8.3 | 10 h 34 | 5 | Good coverage |
| March | 10°C | -2.7°C | 76 mm | 9.5 | 11 h 49 | 10 | Good coverage |
| April | 17°C | 2.9°C | 83 mm | 10.3 | 13 h 14 | 42 | Good coverage |
| May | 22.2°C | 8°C | 95 mm | 9.9 | 14 h 26 | 67 | Good coverage |
| June | 26.8°C | 13.1°C | 96 mm | 9.5 | 15 h 06 | 73 | Good coverage |
| July | 28.7°C | 15.3°C | 92 mm | 9.1 | 14 h 50 | 70 | Good coverage |
| August | 28.2°C | 14.2°C | 84 mm | 7.3 | 13 h 48 | 74 | Good coverage |
| September | 24.3°C | 10.2°C | 98 mm | 8.2 | 12 h 25 | 77 | Good coverage |
| October | 17.8°C | 4.1°C | 75 mm | 8.4 | 11 h 02 | 50 | Good coverage |
| November | 10.7°C | -0.4°C | 72 mm | 9 | 9 h 50 | 18 | Good coverage |
| December | 4.2°C | -5.1°C | 74 mm | 10.3 | 9 h 15 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 22.8°C25 Jan 1950 | -36.7°C19 Jan 1994 | 49 mm21 Jan 1959 | 247 mm1937 · driest 21 mm in 1967 | 117 |
| February | 25.0°C26 Feb 2000 | -31.7°C10 Feb 1899 | 43 mm13 Feb 2007 | 231 mm2008 · driest 10 mm in 1987 | 117 |
| March | 27.8°C24 Mar 1910 | -27.2°C8 Mar 1986 | 61 mm10 Mar 1964 | 192 mm1945 · driest 4 mm in 1910 | 118 |
| April | 32.2°C27 Apr 1990 | -16.7°C1 Apr 1923 | 70 mm20 Apr 1901 | 188 mm1901 · driest 14 mm in 1971 | 117 |
| May | 34.4°C30 May 1895 | -7.2°C10 May 1947 | 94 mm28 May 1985 | 218 mm2011 · driest 16 mm in 1934 | 116 |
| June | 37.8°C26 Jun 1952 | -2.2°C11 Jun 1972 | 94 mm28 Jun 1989 | 232 mm1989 · driest 17 mm in 1988 | 118 |
| July | 39.4°C16 Jul 1988 | 2.2°C12 Jul 1945 | 86 mm21 Jul 1912 | 312 mm1958 · driest 26 mm in 2002 | 117 |
| August | 39.4°C6 Aug 1918 | -2.8°C29 Aug 1982 | 81 mm31 Aug 2005 | 192 mm1898 · driest 8 mm in 1894 | 118 |
| September | 38.3°C2 Sep 1953 | -4.4°C30 Sep 1908 | 122 mm9 Sep 2004 | 244 mm1926 · driest 10 mm in 1903 | 118 |
| October | 32.2°C10 Oct 1949 | -10.0°C31 Oct 1988 | 84 mm8 Oct 1998 | 224 mm1954 · driest 0 mm in 1897 | 118 |
| November | 27.2°C1 Nov 1950 | -20.6°C30 Nov 1976 | 73 mm5 Nov 1985 | 284 mm1985 · driest 12 mm in 1912 | 115 |
| December | 23.3°C3 Dec 1982 | -28.9°C24 Dec 1989 | 51 mm2 Dec 1974 | 182 mm1990 · driest 6 mm in 1955 | 117 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 26 | 2 | 6 |
| February | 0 | 0 | 25 | 2 | 5 |
| March | <1 | 0 | 22 | 3 | 3 |
| April | 4 | <1 | 10 | 3 | <1 |
| May | 11 | 2 | 2 | 4 | 0 |
| June | 22 | 7 | 0 | 3 | 0 |
| July | 28 | 12 | 0 | 3 | 0 |
| August | 26 | 11 | 0 | 3 | 0 |
| September | 15 | 4 | <1 | 3 | 0 |
| October | 4 | <1 | 8 | 3 | <1 |
| November | <1 | 0 | 17 | 2 | 1 |
| December | 0 | 0 | 26 | 2 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 34% | 8% | 41% | -1.7–6.1°C |
| February | <1% | 31% | 7% | 38% | -0.7–6.6°C |
| March | 7% | 34% | 9% | 46% | 5.2–13.1°C |
| April | 22% | 35% | 9% | 45% | 13.2–18.7°C |
| May | 46% | 34% | 11% | 45% | 18.9–24.7°C |
| June | 65% | 31% | 12% | 36% | 24.4–28.6°C |
| July | 70% | 30% | 13% | 32% | 26.9–30.6°C |
| August | 73% | 26% | 10% | 27% | 26.0–29.6°C |
| September | 63% | 25% | 9% | 26% | 22.4–26.4°C |
| October | 32% | 27% | 7% | 29% | 15.1–20.2°C |
| November | 6% | 32% | 8% | 37% | 7.4–13.0°C |
| December | <1% | 31% | 8% | 38% | 0.3–6.5°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