September
September · June · August
79climate match
United States · 1991–2020
Best time to visit
Dayton.
September leads for comfortable weather in Dayton: typically 25.1°C by day, 6°C at night, with 37 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high25.1°C
Typical low6°C
Rain in September37 mm
August
August · July · June
67climate match
May
May · June · September
80climate match
The weakest month is January, scoring 5 against September’s 79 — days reach only 0.1°C, 24° below the 24°C the score treats as ideal.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
50.1° / -9.7°
Feb
53.1° / -7.9°
Mar
1810.1° / -3.1°
Apr
3715° / 0.3°
May
6320.6° / 4.6°
Jun
7826.4° / 8.2°
Jul
6931.8° / 12°
Aug
7130.7° / 11°
Sep
7925.1° / 6°
Oct
4816.9° / 0.6°
Nov
97.9° / -4.6°
Dec
50.6° / -8.9°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 0.1°C | -9.7°C | 42 mm | 7.6 | 9 h 25 | 5 | Strong coverage |
| February | 3.1°C | -7.9°C | 36 mm | 6.6 | 10 h 30 | 5 | Strong coverage |
| March | 10.1°C | -3.1°C | 38 mm | 7 | 11 h 48 | 18 | Strong coverage |
| April | 15°C | 0.3°C | 50 mm | 8.4 | 13 h 17 | 37 | Strong coverage |
| May | 20.6°C | 4.6°C | 54 mm | 8 | 14 h 33 | 63 | Strong coverage |
| June | 26.4°C | 8.2°C | 29 mm | 4.4 | 15 h 14 | 78 | Strong coverage |
| July | 31.8°C | 12°C | 17 mm | 3.2 | 14 h 58 | 69 | Strong coverage |
| August | 30.7°C | 11°C | 20 mm | 3.3 | 13 h 53 | 71 | Strong coverage |
| September | 25.1°C | 6°C | 37 mm | 4.6 | 12 h 26 | 79 | Strong coverage |
| October | 16.9°C | 0.6°C | 41 mm | 5.7 | 11 h | 48 | Strong coverage |
| November | 7.9°C | -4.6°C | 29 mm | 5.8 | 9 h 44 | 9 | Strong coverage |
| December | 0.6°C | -8.9°C | 39 mm | 7.1 | 9 h 07 | 5 | Strong coverage |
What has changed
Dayton runs +1.4°C
on the 1961–1990 baseline.
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.
Jan
+0.9
Feb
+1.0
Mar
+2.0
Apr
+1.1
May
+0.7
Jun
+2.6
Jul
+2.2
Aug
+0.6
Sep
+2.4
Oct
+1.0
Nov
+1.2
Dec
+1.3
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 14.4°C31 Jan 2003 | -31.7°C17 Jan 1984 | 27 mm4 Jan 2017 | 109 mm2017 · driest 7 mm in 2007 | 56 |
| February | 17.2°C7 Feb 2015 | -35.0°C6 Feb 1982 | 40 mm18 Feb 1986 | 86 mm2017 · driest 1 mm in 1988 | 52 |
| March | 25.0°C19 Mar 2026 | -24.4°C13 Mar 1969 | 35 mm13 Mar 1995 | 132 mm1982 · driest 2 mm in 1965 | 53 |
| April | 29.4°C23 Apr 2012 | -11.7°C6 Apr 2023 | 39 mm28 Apr 2005 | 134 mm2005 · driest 5 mm in 1973 | 52 |
| May | 34.4°C30 May 2020 | -6.1°C6 May 1965 | 37 mm28 May 2004 | 194 mm1981 · driest 1 mm in 1969 | 51 |
| June | 37.8°C28 Jun 2015 | -5.6°C6 Jun 1982 | 52 mm3 Jun 1980 | 112 mm2009 · driest 0 mm in 2021 | 52 |
| July | 43.3°C23 Jul 2000 | 0.0°C1 Jul 1968 | 28 mm22 Jul 1987 | 60 mm1987 · driest 1 mm in 2025 | 50 |
| August | 37.8°C14 Aug 2003 | -1.1°C26 Aug 1992 | 39 mm6 Aug 2022 | 82 mm1968 · driest 0 mm in 2002 | 51 |
| September | 36.7°C7 Sep 2022 | -10.6°C19 Sep 1965 | 56 mm28 Sep 1986 | 127 mm1986 · driest 0 mm in 2018 | 51 |
| October | 30.6°C2 Oct 2010 | -15.6°C30 Oct 2019 | 57 mm8 Oct 2021 | 134 mm2021 · driest 2 mm in 2017 | 53 |
| November | 21.1°C6 Nov 2020 | -22.2°C25 Nov 2010 | 25 mm23 Nov 1965 | 89 mm1965 · driest 1 mm in 1993 | 52 |
| December | 18.3°C2 Dec 1995 | -35.0°C23 Dec 1990 | 27 mm16 Dec 2016 | 121 mm1983 · driest 3 mm in 1986 | 53 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 29 | 1 | 7 |
| February | 0 | 0 | 26 | <1 | 6 |
| March | 0 | 0 | 24 | 1 | 4 |
| April | 1 | 0 | 14 | 1 | 2 |
| May | 9 | 1 | 4 | 2 | <1 |
| June | 20 | 9 | <1 | 1 | 0 |
| July | 30 | 24 | 0 | <1 | 0 |
| August | 29 | 21 | <1 | <1 | 0 |
| September | 18 | 5 | 2 | 1 | 0 |
| October | 3 | <1 | 14 | 1 | <1 |
| November | 0 | 0 | 26 | <1 | 3 |
| December | 0 | 0 | 29 | 1 | 7 |
The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 82); on 2011–2025 it is September (80). 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 | 0% | 23% | 3% | 23% | -3.7–3.1°C |
| February | 0% | 21% | 3% | 23% | -0.4–6.0°C |
| March | 4% | 23% | 3% | 26% | 6.0–12.6°C |
| April | 20% | 24% | 3% | 26% | 11.6–17.4°C |
| May | 50% | 24% | 5% | 29% | 17.8–22.8°C |
| June | 78% | 17% | 4% | 13% | 23.2–28.5°C |
| July | 90% | 10% | 1% | 6% | 29.0–33.5°C |
| August | 88% | 12% | 2% | 10% | 28.7–32.4°C |
| September | 74% | 16% | 4% | 15% | 21.1–27.6°C |
| October | 31% | 18% | 4% | 16% | 13.5–19.7°C |
| November | <1% | 20% | 3% | 21% | 4.2–10.3°C |
| December | 0% | 24% | 3% | 24% | -2.3–3.4°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
Nearby, measured,
and named.
- Place identity
- GeoNames 5590572
- NOAA station
- USC00107346 · PRESTON
- Station distance
- 9.4 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 26 usable years
- Daylight
- Calculated from latitude 42.11°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.