September
September · May · October
United States · 1991–2020
September leads for comfortable weather in Saint Paul: typically 27.4°C by day, 14.5°C at night, with 123 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · October
July · August · June
October · April · November
The weakest month is January, scoring 5 against September’s 73 — days reach only 6°C, 18° below the 24°C the score treats as ideal, and nights drop to -5.5°C.
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 | -5.5°C | 36 mm | 4.6 | 9 h 50 | 5 | Strong coverage |
| February | 8.9°C | -3.5°C | 43 mm | 4.6 | 10 h 45 | 14 | Strong coverage |
| March | 14.2°C | 1.6°C | 75 mm | 7.3 | 11 h 50 | 34 | Strong coverage |
| April | 19.4°C | 6.8°C | 123 mm | 8.3 | 13 h 06 | 53 | Strong coverage |
| May | 24.2°C | 12.9°C | 175 mm | 10.5 | 14 h 10 | 69 | Strong coverage |
| June | 29.4°C | 18.1°C | 143 mm | 8.7 | 14 h 44 | 56 | Strong coverage |
| July | 32.3°C | 20.4°C | 108 mm | 7.3 | 14 h 31 | 49 | Strong coverage |
| August | 32°C | 19.2°C | 103 mm | 6.3 | 13 h 36 | 53 | Strong coverage |
| September | 27.4°C | 14.5°C | 123 mm | 6.3 | 12 h 23 | 73 | Strong coverage |
| October | 21.2°C | 7.7°C | 92 mm | 6.8 | 11 h 09 | 66 | Strong coverage |
| November | 13.8°C | 1.6°C | 71 mm | 5.6 | 10 h 06 | 35 | Strong coverage |
| December | 7.8°C | -3.5°C | 52 mm | 4.6 | 9 h 35 | 9 | 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 | 25.0°C24 Jan 1950 | -27.8°C18 Jan 1930 | 63 mm5 Jan 1946 | 190 mm1949 · driest 0 mm in 2012 | 102 |
| February | 29.4°C12 Feb 1962 | -27.8°C16 Feb 2021 | 76 mm21 Feb 1997 | 134 mm1985 · driest 0 mm in 2006 | 102 |
| March | 33.9°C22 Mar 2026 | -19.4°C11 Mar 1948 | 113 mm10 Mar 1974 | 201 mm1974 · driest 6 mm in 1930 | 102 |
| April | 36.7°C14 Apr 1936 | -9.4°C3 Apr 1936 | 148 mm11 Apr 1994 | 346 mm1994 · driest 7 mm in 1989 | 102 |
| May | 38.3°C31 May 1934 | -1.1°C6 May 1944 | 197 mm5 May 2022 | 489 mm2019 · driest 24 mm in 1941 | 102 |
| June | 42.2°C23 Jun 1934 | 6.7°C1 Jun 1983 | 190 mm22 Jun 1948 | 434 mm1935 · driest 6 mm in 1952 | 102 |
| July | 46.1°C14 Jul 1954 | 9.4°C6 Jul 1972 | 185 mm16 Jul 2021 | 340 mm1992 · driest 0 mm in 1935 | 102 |
| August | 45.0°C9 Aug 1936 | 8.3°C21 Aug 1950 | 122 mm16 Aug 1938 | 371 mm2019 · driest 0 mm in 2000 | 101 |
| September | 42.2°C3 Sep 1947 | -2.2°C30 Sep 1984 | 183 mm14 Sep 1998 | 384 mm1945 · driest 1 mm in 1939 | 101 |
| October | 36.1°C1 Oct 1952 | -8.3°C31 Oct 1993 | 151 mm3 Oct 1986 | 350 mm1941 · driest 0 mm in 1958 | 101 |
| November | 30.0°C1 Nov 1937 | -15.0°C16 Nov 1932 | 141 mm20 Nov 1979 | 208 mm2015 · driest 0 mm in 1976 | 101 |
| December | 25.0°C7 Dec 1966 | -27.2°C22 Dec 1989 | 72 mm27 Dec 2015 | 163 mm2015 · driest 1 mm in 2025 | 101 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 26 | 1 | 2 |
| February | <1 | 0 | 22 | 1 | 1 |
| March | 2 | <1 | 13 | 3 | <1 |
| April | 6 | <1 | 3 | 4 | 0 |
| May | 16 | 3 | 0 | 6 | 0 |
| June | 27 | 16 | 0 | 4 | 0 |
| July | 30 | 24 | 0 | 3 | 0 |
| August | 30 | 22 | 0 | 3 | 0 |
| September | 22 | 11 | 0 | 3 | 0 |
| October | 10 | 1 | 3 | 3 | 0 |
| November | <1 | 0 | 13 | 2 | <1 |
| December | 0 | 0 | 24 | 2 | 1 |
The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 78); on 2011–2025 it is September (78). 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% | 15% | 4% | 10% | 3.0–9.8°C |
| February | 8% | 16% | 5% | 12% | 5.2–13.4°C |
| March | 24% | 22% | 8% | 21% | 11.2–18.4°C |
| April | 46% | 26% | 12% | 27% | 18.3–23.7°C |
| May | 62% | 31% | 16% | 40% | 22.7–27.3°C |
| June | 72% | 28% | 15% | 30% | 27.8–32.0°C |
| July | 80% | 20% | 10% | 18% | 31.0–35.9°C |
| August | 80% | 20% | 9% | 19% | 30.0–35.9°C |
| September | 76% | 21% | 10% | 19% | 25.8–31.4°C |
| October | 58% | 20% | 9% | 19% | 19.7–25.7°C |
| November | 19% | 17% | 7% | 14% | 10.6–17.1°C |
| December | 3% | 15% | 5% | 11% | 5.4–11.1°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