Oswego weather in September: Oswego, New York: normal highs, lows, rain and records for September
Oswego in September has a normal high of 72°F and a normal low of 55°F, a daily mean of 63°F, falling from 76°F on the 1st to 66°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 3.92 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 13°C, 100 mm of precipitation in September.
- NOAA stationOswego
- Station IDUSC00306314
- Location43.45°N 76.54°W
- Elevation324 ft (99 m)
- Population17,047
- Jan 31° 19°
- Feb 33° 20°
- Mar 41° 27°
- Apr 53° 37°
- May 66° 48°
- Jun 75° 57°
- Jul 80° 63°
- Aug 79° 62°
- Sep 72° 55°
- Oct 59° 45°
- Nov 47° 35°
- Dec 37° 26°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Oswego in September?
The normal high is 72°F and the normal low 55°F, for a daily mean of 63.4°F. September is 7.0°F cooler than August and 11.3°F warmer than October. September is the 4th warmest month of the year in Oswego and the 3rd wettest. Across the month the normal high falls 10°F, from 76°F on September 1 to 66°F on September 30. From one year to the next September's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 61°F and 66°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 43%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 76°F | 60°F | 34% | 22% |
| September 8 | 75°F | 58°F | 35% | 23% |
| September 15 | 72°F | 56°F | 37% | 25% |
| September 22 | 69°F | 53°F | 40% | 26% |
| September 30 | 66°F | 50°F | 43% | 28% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 76°F | 60°F | 34% | 22% | 13 h 20 min |
| September 2 | 76°F | 59°F | 34% | 22% | 13 h 10 min |
| September 3 | 76°F | 59°F | 34% | 22% | 13 h 10 min |
| September 4 | 76°F | 59°F | 34% | 22% | 13 h 10 min |
| September 5 | 75°F | 59°F | 34% | 23% | 13 h |
| September 6 | 75°F | 58°F | 35% | 23% | 13 h |
| September 7 | 75°F | 58°F | 35% | 23% | 13 h |
| September 8 | 75°F | 58°F | 35% | 23% | 12 h 50 min |
| September 9 | 74°F | 57°F | 36% | 23% | 12 h 50 min |
| September 10 | 74°F | 57°F | 36% | 24% | 12 h 50 min |
| September 11 | 74°F | 57°F | 36% | 24% | 12 h 50 min |
| September 12 | 73°F | 57°F | 36% | 24% | 12 h 40 min |
| September 13 | 73°F | 56°F | 37% | 24% | 12 h 40 min |
| September 14 | 73°F | 56°F | 37% | 24% | 12 h 40 min |
| September 15 | 72°F | 56°F | 37% | 25% | 12 h 30 min |
| September 16 | 72°F | 55°F | 37% | 25% | 12 h 30 min |
| September 17 | 71°F | 55°F | 38% | 25% | 12 h 30 min |
| September 18 | 71°F | 55°F | 38% | 25% | 12 h 30 min |
| September 19 | 71°F | 54°F | 38% | 25% | 12 h 20 min |
| September 20 | 70°F | 54°F | 39% | 26% | 12 h 20 min |
| September 21 | 70°F | 54°F | 39% | 26% | 12 h 20 min |
| September 22 | 69°F | 53°F | 40% | 26% | 12 h 10 min |
| September 23 | 69°F | 53°F | 40% | 27% | 12 h 10 min |
| September 24 | 68°F | 52°F | 40% | 27% | 12 h 10 min |
| September 25 | 68°F | 52°F | 41% | 27% | 12 h 10 min |
| September 26 | 68°F | 52°F | 41% | 27% | 12 h |
| September 27 | 67°F | 51°F | 42% | 28% | 12 h |
| September 28 | 67°F | 51°F | 42% | 28% | 12 h |
| September 29 | 66°F | 51°F | 43% | 28% | 11 h 50 min |
| September 30 | 66°F | 50°F | 43% | 28% | 11 h 50 min |
- Normal high
- 72°FSeptember average
- Normal low
- 55°FSeptember average
- Precipitation
- 3.92 inmonth total
- Days with precipitation
- 110.01 inch or more
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 19
- Days at 80°F or more
- 5
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00306314; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Oswego in September?
On a given September day the chance of 0.01 inch or more is 38% on average, highest around September 30 (43%). In all, 3.92 in falls on 11 days of a normal September, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00306314.
What are the records for September in Oswego?
The warmest September temperature on Oswego's official record (since 1926) is 96°F, on September 5, 1953; the coldest is 30°F, on September 24, 1963. The wettest September brought 8.64 in (2010).
The September mean against the 1991-2020 normal of 63.4°F: 2021 66.1°F (+2.7), 2022 64.5°F (+1.1), 2023 65.2°F (+1.8), 2024 66.7°F (+3.3), 2025 64.4°F (+1.0), 2026 65.0°F (+1.6). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 66.1°F | +2.7°F | 3.56 in |
| 2022 | 64.5°F | +1.1°F | 6.86 in |
| 2023 | 65.2°F | +1.8°F | 1.92 in |
| 2024 | 66.7°F | +3.3°F | 3.45 in |
| 2025 | 64.4°F | +1.0°F | 1.62 in |
| 2026 | 65.0°F | +1.6°F | 1.65 in |
Source: records: ACIS, NWS threaded record OSWN6thr; recent months: ACIS, station USC00306314. Records and recent months use complete months only.
How does September in Oswego compare across New York?
Across the 131 places PlainClimate covers in New York, September normal highs run from 64°F in Cooperstown to 78°F in Wantagh; Oswego's is 72°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.