September
September · June · July
84climate match
United States · 1991–2020
Best time to visit
Oswego.
September leads for comfortable weather in Oswego: typically 24.4°C by day, 7.4°C at night, with 38 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.4°C
Typical low7.4°C
Rain in September38 mm
July
July · August · June
70climate match
May
May · September · October
85climate match
The weakest month is January, scoring 5 against September’s 84 — days reach only -3.9°C, 28° below the 24°C the score treats as ideal, and nights drop to -15.7°C.
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
5-3.9° / -15.7°
Feb
5-0.8° / -13.2°
Mar
77.6° / -6.6°
Apr
4315° / -0.4°
May
7121.2° / 5.8°
Jun
7326.1° / 11.1°
Jul
7230.7° / 14.2°
Aug
7230.8° / 13.4°
Sep
8424.4° / 7.4°
Oct
4615.7° / 0.4°
Nov
55.9° / -6.8°
Dec
5-1.9° / -13.3°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -3.9°C | -15.7°C | 14 mm | 2.2 | 8 h 46 | 5 | Good coverage |
| February | -0.8°C | -13.2°C | 7 mm | 1.4 | 10 h 08 | 5 | Strong coverage |
| March | 7.6°C | -6.6°C | 12 mm | 1.8 | 11 h 44 | 7 | Good coverage |
| April | 15°C | -0.4°C | 21 mm | 2.5 | 13 h 34 | 43 | Good coverage |
| May | 21.2°C | 5.8°C | 49 mm | 4.8 | 15 h 09 | 71 | Strong coverage |
| June | 26.1°C | 11.1°C | 92 mm | 8.4 | 16 h 01 | 73 | Good coverage |
| July | 30.7°C | 14.2°C | 54 mm | 5.5 | 15 h 41 | 72 | Strong coverage |
| August | 30.8°C | 13.4°C | 49 mm | 4.5 | 14 h 18 | 72 | Strong coverage |
| September | 24.4°C | 7.4°C | 38 mm | 3.5 | 12 h 31 | 84 | Strong coverage |
| October | 15.7°C | 0.4°C | 28 mm | 3.4 | 10 h 44 | 46 | Strong coverage |
| November | 5.9°C | -6.8°C | 15 mm | 1.8 | 9 h 10 | 5 | Strong coverage |
| December | -1.9°C | -13.3°C | 11 mm | 2.2 | 8 h 23 | 5 | Good coverage |
What has changed
Oswego runs -0.1°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
+2.0
Feb
-1.4
Mar
+0.1
Apr
-2.5
May
-1.2
Jun
-1.0
Jul
-0.9
Aug—
Sep
+2.4
Oct
0.0
Nov
+0.5
Dec
+0.8
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 15.0°C13 Jan 2021 | -41.1°C11 Jan 1974 | 51 mm17 Jan 2001 | 76 mm2001 · driest 0 mm in 1977 | 48 |
| February | 21.7°C27 Feb 1992 | -38.9°C3 Feb 1982 | 20 mm25 Feb 2015 | 32 mm2015 · driest 0 mm in 2003 | 49 |
| March | 26.7°C26 Mar 1999 | -35.0°C7 Mar 1996 | 31 mm21 Mar 1987 | 47 mm2008 · driest 0 mm in 1978 | 48 |
| April | 35.0°C20 Apr 1980 | -18.3°C1 Apr 2018 | 33 mm29 Apr 2009 | 73 mm2016 · driest 0 mm in 1984 | 47 |
| May | 38.9°C22 May 1980 | -8.3°C1 May 2013 | 114 mm8 May 2002 | 181 mm2002 · driest 0 mm in 1980 | 51 |
| June | 44.4°C26 Jun 1988 | 0.6°C3 Jun 2022 | 72 mm21 Jun 1984 | 178 mm2005 · driest 0 mm in 1985 | 48 |
| July | 41.7°C13 Jul 1983 | 0.0°C24 Jul 2010 | 68 mm21 Jul 1987 | 189 mm1987 · driest 2 mm in 1984 | 48 |
| August | 42.8°C7 Aug 1995 | 1.1°C31 Aug 1994 | 48 mm23 Aug 2014 | 143 mm1980 · driest 0 mm in 2001 | 47 |
| September | 40.6°C1 Sep 1983 | -13.3°C18 Sep 1991 | 43 mm18 Sep 1996 | 161 mm2019 · driest 0 mm in 1979 | 47 |
| October | 33.9°C3 Oct 1997 | -23.3°C30 Oct 1991 | 33 mm7 Oct 2011 | 106 mm1998 · driest 0 mm in 1978 | 47 |
| November | 23.9°C3 Nov 2020 | -30.0°C30 Nov 1985 | 102 mm6 Nov 2000 | 153 mm2000 · driest 0 mm in 1982 | 50 |
| December | 18.3°C1 Dec 2021 | -42.2°C9 Dec 1977 | 23 mm4 Dec 1998 | 33 mm1998 · driest 0 mm in 2007 | 50 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 26 | <1 | 1 |
| February | 0 | 0 | 25 | <1 | <1 |
| March | <1 | 0 | 24 | <1 | <1 |
| April | 2 | <1 | 15 | <1 | <1 |
| May | 8 | 2 | 3 | 2 | 0 |
| June | 17 | 6 | 0 | 3 | 0 |
| July | 25 | 17 | 0 | 2 | 0 |
| August | 25 | 17 | 0 | 2 | 0 |
| September | 13 | 5 | 2 | 1 | 0 |
| October | 3 | <1 | 13 | <1 | <1 |
| November | 0 | 0 | 22 | <1 | <1 |
| December | 0 | 0 | 27 | <1 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 6% | 1% | <1% | -10.0–0.9°C |
| February | <1% | 5% | <1% | 1% | -6.7–5.6°C |
| March | 4% | 6% | 1% | 3% | 1.9–12.9°C |
| April | 32% | 9% | 2% | 3% | 11.6–19.2°C |
| May | 58% | 17% | 7% | 16% | 19.3–25.1°C |
| June | 72% | 25% | 10% | 28% | 24.4–29.2°C |
| July | 83% | 16% | 6% | 11% | 29.5–33.7°C |
| August | 84% | 14% | 5% | 8% | 27.1–33.2°C |
| September | 71% | 12% | 4% | 8% | 20.2–27.8°C |
| October | 31% | 8% | 2% | 4% | 12.3–19.1°C |
| November | 3% | 7% | <1% | 1% | 1.2–10.8°C |
| December | 0% | 8% | <1% | 3% | -7.5–3.0°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 5670206
- NOAA station
- USC00249103 · WOLF PT
- Station distance
- 17.9 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 23 usable years
- Daylight
- Calculated from latitude 48.06°, 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.