September
September · June · August
81climate match
United States · 1991–2020
Best time to visit
Delta.
September leads for comfortable weather in Delta: typically 24.6°C by day, 11°C at night, with 77 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.6°C
Typical low11°C
Rain in September77 mm
July
July · August · June
71climate match
May
May · September · October
74climate match
The weakest month is January, scoring 5 against September’s 81 — days reach only 0°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° / -8.3°
Feb
51.8° / -7.5°
Mar
67.7° / -3°
Apr
3715.2° / 2.6°
May
6621.6° / 8.8°
Jun
7726.8° / 14.4°
Jul
6928.8° / 16.2°
Aug
7627.6° / 14.9°
Sep
8124.6° / 11°
Oct
5117.3° / 5.1°
Nov
159.2° / -0.4°
Dec
52.8° / -5°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 0°C | -8.3°C | 55 mm | 8.1 | 9 h 28 | 5 | Strong coverage |
| February | 1.8°C | -7.5°C | 46 mm | 6.5 | 10 h 32 | 5 | Strong coverage |
| March | 7.7°C | -3°C | 60 mm | 7.2 | 11 h 48 | 6 | Strong coverage |
| April | 15.2°C | 2.6°C | 81 mm | 8.9 | 13 h 16 | 37 | Strong coverage |
| May | 21.6°C | 8.8°C | 98 mm | 10 | 14 h 30 | 66 | Strong coverage |
| June | 26.8°C | 14.4°C | 93 mm | 8.5 | 15 h 10 | 77 | Strong coverage |
| July | 28.8°C | 16.2°C | 95 mm | 7.3 | 14 h 54 | 69 | Strong coverage |
| August | 27.6°C | 14.9°C | 89 mm | 7.8 | 13 h 51 | 76 | Strong coverage |
| September | 24.6°C | 11°C | 77 mm | 6.9 | 12 h 25 | 81 | Strong coverage |
| October | 17.3°C | 5.1°C | 67 mm | 7.9 | 11 h 01 | 51 | Strong coverage |
| November | 9.2°C | -0.4°C | 68 mm | 7.7 | 9 h 47 | 15 | Strong coverage |
| December | 2.8°C | -5°C | 58 mm | 7.6 | 9 h 11 | 5 | Strong coverage |
What has changed
Delta runs +0.3°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
+0.7
Mar
+0.5
Apr
-0.6
May
-0.1
Jun
-0.2
Jul
0.0
Aug
+0.1
Sep
+0.6
Oct
+0.5
Nov
-0.2
Dec
+2.0
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.1°C25 Jan 1950 | -31.1°C21 Jan 1984 | 59 mm31 Jan 1982 | 192 mm1950 · driest 4 mm in 1961 | 133 |
| February | 21.7°C27 Feb 2000 | -30.6°C20 Feb 1929 | 53 mm9 Feb 1894 | 146 mm1900 · driest 0 mm in 1987 | 134 |
| March | 29.4°C22 Mar 2012 | -23.9°C12 Mar 1948 | 63 mm19 Mar 1898 | 205 mm1898 · driest 3 mm in 1910 | 134 |
| April | 32.8°C29 Apr 1899 | -16.7°C7 Apr 1982 | 88 mm23 Apr 1977 | 215 mm1961 · driest 16 mm in 2004 | 133 |
| May | 36.1°C28 May 1911 | -3.9°C4 May 1903 | 69 mm19 May 2000 | 269 mm1943 · driest 9 mm in 1939 | 134 |
| June | 40.0°C29 Jun 2012 | -1.1°C3 Jun 2003 | 103 mm26 Jun 1911 | 230 mm2015 · driest 4 mm in 1988 | 134 |
| July | 42.8°C14 Jul 1936 | -1.1°C30 Jul 1997 | 102 mm5 Jul 1969 | 280 mm1896 · driest 6 mm in 1974 | 133 |
| August | 42.8°C7 Aug 1918 | 0.6°C27 Aug 2025 | 81 mm12 Aug 1923 | 287 mm1998 · driest 10 mm in 1976 | 132 |
| September | 37.8°C2 Sep 1953 | -3.3°C23 Sep 1896 | 85 mm11 Sep 2014 | 225 mm1926 · driest 12 mm in 1908 | 131 |
| October | 34.4°C1 Oct 1897 | -10.6°C30 Oct 1895 | 97 mm18 Oct 1988 | 194 mm2021 · driest 1 mm in 1963 | 133 |
| November | 26.1°C1 Nov 1950 | -18.9°C30 Nov 1958 | 94 mm2 Nov 1982 | 199 mm1982 · driest 4 mm in 1904 | 133 |
| December | 20.0°C7 Dec 1998 | -29.4°C22 Dec 1989 | 72 mm13 Dec 1901 | 187 mm1967 · driest 10 mm in 1919 | 133 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 2 | 6 |
| February | 0 | 0 | 26 | 1 | 6 |
| March | <1 | 0 | 23 | 2 | 3 |
| April | 2 | 0 | 9 | 3 | <1 |
| May | 10 | 2 | <1 | 3 | 0 |
| June | 21 | 8 | 0 | 3 | 0 |
| July | 28 | 12 | 0 | 3 | 0 |
| August | 25 | 7 | 0 | 3 | 0 |
| September | 15 | 4 | <1 | 3 | 0 |
| October | 3 | <1 | 5 | 2 | 0 |
| November | 0 | 0 | 18 | 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 | 0% | 26% | 5% | 26% | -3.7–3.7°C |
| February | <1% | 24% | 5% | 24% | -2.3–5.0°C |
| March | 4% | 28% | 7% | 34% | 4.2–11.6°C |
| April | 18% | 32% | 9% | 40% | 12.6–17.9°C |
| May | 45% | 33% | 10% | 41% | 18.6–24.8°C |
| June | 69% | 28% | 11% | 30% | 24.7–29.2°C |
| July | 75% | 25% | 10% | 26% | 27.3–31.5°C |
| August | 76% | 24% | 9% | 22% | 26.5–30.0°C |
| September | 65% | 23% | 9% | 23% | 22.6–26.9°C |
| October | 30% | 24% | 7% | 25% | 15.4–20.4°C |
| November | 4% | 28% | 7% | 33% | 6.3–11.9°C |
| December | 0% | 27% | 6% | 31% | -1.2–5.5°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
Nearby, measured,
and named.
- Place identity
- GeoNames 5151948
- NOAA station
- USC00338822 · WAUSEON WTP
- Station distance
- 13.2 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 28 usable years
- Daylight
- Calculated from latitude 41.57°, 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.