September
September · June · August
82climate match
United States · 1991–2020
Best time to visit
Defiance.
September leads for comfortable weather in Defiance: typically 24.7°C by day, 12.2°C at night, with 82 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.7°C
Typical low12.2°C
Rain in September82 mm
July
July · August · June
73climate match
May
May · October · September
72climate match
The weakest month is January, scoring 5 against September’s 82 — days reach only 0.2°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
50.2° / -7.9°
Feb
52° / -6.8°
Mar
78° / -2.3°
Apr
3615.5° / 3.5°
May
6621.8° / 9.8°
Jun
7527.1° / 15.4°
Jul
6629.2° / 17.3°
Aug
7327.9° / 16.3°
Sep
8224.7° / 12.2°
Oct
5217.4° / 5.9°
Nov
159.5° / 0.2°
Dec
52.9° / -4.6°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 0.2°C | -7.9°C | 64 mm | 8.9 | 9 h 30 | 5 | Strong coverage |
| February | 2°C | -6.8°C | 56 mm | 7.2 | 10 h 33 | 5 | Strong coverage |
| March | 8°C | -2.3°C | 65 mm | 8.4 | 11 h 48 | 7 | Strong coverage |
| April | 15.5°C | 3.5°C | 94 mm | 10.5 | 13 h 15 | 36 | Strong coverage |
| May | 21.8°C | 9.8°C | 108 mm | 10.9 | 14 h 28 | 66 | Strong coverage |
| June | 27.1°C | 15.4°C | 93 mm | 9 | 15 h 08 | 75 | Strong coverage |
| July | 29.2°C | 17.3°C | 95 mm | 7.8 | 14 h 53 | 66 | Strong coverage |
| August | 27.9°C | 16.3°C | 89 mm | 7.4 | 13 h 49 | 73 | Strong coverage |
| September | 24.7°C | 12.2°C | 82 mm | 6.9 | 12 h 25 | 82 | Strong coverage |
| October | 17.4°C | 5.9°C | 73 mm | 8.2 | 11 h 01 | 52 | Strong coverage |
| November | 9.5°C | 0.2°C | 76 mm | 8.5 | 9 h 48 | 15 | Strong coverage |
| December | 2.9°C | -4.6°C | 64 mm | 8.2 | 9 h 12 | 5 | Strong coverage |
What has changed
Defiance runs +0.7°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
+1.1
Mar
+1.5
Apr
+0.2
May
+0.3
Jun
+0.3
Jul
+0.3
Aug
-0.1
Sep
+0.9
Oct
+0.5
Nov
+0.1
Dec
+1.9
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.1°C30 Jan 1896 | -32.2°C13 Jan 1912 | 49 mm19 Jan 1996 | 199 mm1950 · driest 5 mm in 1961 | 115 |
| February | 22.8°C26 Feb 2000 | -30.0°C10 Feb 1912 | 56 mm27 Feb 1997 | 147 mm1990 · driest 2 mm in 1987 | 117 |
| March | 31.7°C22 Mar 1907 | -21.7°C8 Mar 1943 | 57 mm14 Mar 1933 | 160 mm1904 · driest 2 mm in 1910 | 115 |
| April | 32.8°C17 Apr 1896 | -15.6°C7 Apr 1982 | 104 mm23 Apr 1977 | 242 mm2026 · driest 21 mm in 1946 | 116 |
| May | 37.2°C28 May 1911 | -4.4°C10 May 1966 | 88 mm26 May 2011 | 232 mm1943 · driest 16 mm in 1934 | 115 |
| June | 41.7°C29 Jun 2012 | 1.7°C2 Jun 1910 | 81 mm28 Jun 1894 | 305 mm1981 · driest 7 mm in 1984 | 113 |
| July | 43.9°C25 Jul 1934 | 4.4°C26 Jul 1911 | 110 mm5 Jul 1901 | 208 mm1896 · driest 20 mm in 1974 | 114 |
| August | 40.0°C10 Aug 1934 | 2.2°C29 Aug 1965 | 102 mm15 Aug 1909 | 255 mm2007 · driest 1 mm in 2025 | 113 |
| September | 37.8°C9 Sep 1933 | -3.3°C21 Sep 1897 | 118 mm18 Sep 1907 | 227 mm2011 · driest 7 mm in 1897 | 114 |
| October | 33.3°C15 Oct 1897 | -10.0°C30 Oct 1895 | 99 mm18 Oct 1988 | 217 mm2001 · driest 0 mm in 1963 | 113 |
| November | 27.8°C2 Nov 1933 | -17.8°C24 Nov 1950 | 82 mm9 Nov 1966 | 197 mm1982 · driest 5 mm in 1904 | 112 |
| December | 21.1°C7 Dec 1998 | -28.3°C23 Dec 1989 | 70 mm8 Dec 1966 | 158 mm1990 · driest 4 mm in 1958 | 113 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 2 | 6 |
| February | 0 | 0 | 25 | 2 | 4 |
| March | <1 | 0 | 22 | 2 | 2 |
| April | 3 | <1 | 7 | 3 | <1 |
| May | 10 | 3 | <1 | 4 | 0 |
| June | 21 | 9 | 0 | 3 | 0 |
| July | 28 | 14 | 0 | 3 | 0 |
| August | 26 | 9 | 0 | 3 | 0 |
| September | 16 | 4 | <1 | 3 | 0 |
| October | 4 | <1 | 3 | 2 | 0 |
| November | <1 | 0 | 16 | 2 | 1 |
| December | 0 | 0 | 26 | 2 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 26% | 6% | 26% | -3.6–4.2°C |
| February | <1% | 25% | 5% | 24% | -2.3–5.0°C |
| March | 5% | 28% | 7% | 32% | 4.3–12.0°C |
| April | 18% | 34% | 10% | 42% | 12.8–18.1°C |
| May | 44% | 33% | 11% | 40% | 19.0–24.9°C |
| June | 66% | 30% | 11% | 33% | 25.0–29.5°C |
| July | 74% | 26% | 11% | 26% | 27.8–31.9°C |
| August | 76% | 23% | 8% | 21% | 26.9–30.5°C |
| September | 65% | 24% | 9% | 24% | 22.9–26.9°C |
| October | 30% | 25% | 7% | 26% | 15.4–21.0°C |
| November | 5% | 28% | 8% | 30% | 6.4–12.4°C |
| December | <1% | 27% | 7% | 30% | -0.9–5.7°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 5151861
- NOAA station
- USC00332098 · DEFIANCE
- Station distance
- 2.5 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 41.28°, 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.