Olean weather in September: Olean, New York: normal highs, lows, rain and records for September
Olean in September has a normal high of 73°F and a normal low of 49°F, a daily mean of 61°F, falling from 77°F on the 1st to 67°F by the 30th. Measurable precipitation falls on 12 days in a normal September, 3.85 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 9°C, 98 mm of precipitation in September.
- NOAA stationOlean
- Station IDUSC00306196
- Location42.07°N 78.45°W
- Elevation1,420 ft (433 m)
- From the center1 miles
- Population13,614
- Jan 32° 13°
- Feb 34° 15°
- Mar 43° 21°
- Apr 57° 32°
- May 68° 44°
- Jun 76° 53°
- Jul 80° 57°
- Aug 79° 55°
- Sep 73° 49°
- Oct 60° 38°
- Nov 47° 29°
- Dec 37° 21°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Olean in September?
The normal high is 73°F and the normal low 49°F, for a daily mean of 60.8°F. September is 6.2°F cooler than August and 11.7°F warmer than October. September is the 4th warmest month of the year in Olean and the 4th wettest. Across the month the normal high falls 10°F, from 77°F on September 1 to 67°F on September 30. From one year to the next September's mean temperature typically moves about 2.2°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 59°F and 63°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 45%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 77°F | 53°F | 40% | 23% |
| September 8 | 75°F | 51°F | 40% | 24% |
| September 15 | 73°F | 49°F | 41% | 24% |
| September 22 | 71°F | 47°F | 43% | 25% |
| September 30 | 67°F | 45°F | 45% | 26% |
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 | 77°F | 53°F | 40% | 23% | 13 h 10 min |
| September 2 | 77°F | 53°F | 40% | 23% | 13 h 10 min |
| September 3 | 76°F | 52°F | 40% | 23% | 13 h 10 min |
| September 4 | 76°F | 52°F | 40% | 23% | 13 h |
| September 5 | 76°F | 52°F | 40% | 23% | 13 h |
| September 6 | 76°F | 52°F | 40% | 23% | 13 h |
| September 7 | 75°F | 51°F | 40% | 23% | 13 h |
| September 8 | 75°F | 51°F | 40% | 24% | 12 h 50 min |
| September 9 | 75°F | 51°F | 40% | 24% | 12 h 50 min |
| September 10 | 75°F | 51°F | 40% | 24% | 12 h 50 min |
| September 11 | 74°F | 50°F | 41% | 24% | 12 h 40 min |
| September 12 | 74°F | 50°F | 41% | 24% | 12 h 40 min |
| September 13 | 74°F | 50°F | 41% | 24% | 12 h 40 min |
| September 14 | 74°F | 50°F | 41% | 24% | 12 h 40 min |
| September 15 | 73°F | 49°F | 41% | 24% | 12 h 30 min |
| September 16 | 73°F | 49°F | 41% | 24% | 12 h 30 min |
| September 17 | 73°F | 49°F | 41% | 24% | 12 h 30 min |
| September 18 | 72°F | 49°F | 41% | 24% | 12 h 20 min |
| September 19 | 72°F | 48°F | 42% | 24% | 12 h 20 min |
| September 20 | 71°F | 48°F | 42% | 24% | 12 h 20 min |
| September 21 | 71°F | 48°F | 42% | 24% | 12 h 20 min |
| September 22 | 71°F | 47°F | 43% | 25% | 12 h 10 min |
| September 23 | 70°F | 47°F | 43% | 25% | 12 h 10 min |
| September 24 | 70°F | 47°F | 43% | 25% | 12 h 10 min |
| September 25 | 69°F | 46°F | 44% | 25% | 12 h 10 min |
| September 26 | 69°F | 46°F | 44% | 25% | 12 h |
| September 27 | 69°F | 46°F | 44% | 25% | 12 h |
| September 28 | 68°F | 45°F | 45% | 25% | 12 h |
| September 29 | 68°F | 45°F | 45% | 26% | 11 h 50 min |
| September 30 | 67°F | 45°F | 45% | 26% | 11 h 50 min |
- Normal high
- 73°FSeptember average
- Normal low
- 49°FSeptember average
- Precipitation
- 3.85 inmonth total
- Days with precipitation
- 120.01 inch or more
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 21
- Days at 80°F or more
- 8
- Sunshine
- 74%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00306196; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Olean in September?
On a given September day the chance of 0.01 inch or more is 42% on average, highest around September 30 (45%). In all, 3.85 in falls on 12 days of a normal September, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00306196.
What are the records for September in Olean?
The September mean against the 1991-2020 normal of 60.8°F: 2021 62.3°F (+1.5), 2022 61.3°F (+0.5), 2023 61.2°F (+0.4), 2024 62.6°F (+1.8), 2025 61.5°F (+0.7), 2026 61.7°F (+0.9). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 62.3°F | +1.5°F | 4.42 in |
| 2022 | 61.3°F | +0.5°F | 5.17 in |
| 2023 | 61.2°F | +0.4°F | 2.00 in |
| 2024 | 62.6°F | +1.8°F | 3.51 in |
| 2025 | 61.5°F | +0.7°F | 0.91 in |
| 2026 | 61.7°F | +0.9°F | 3.88 in |
Source: recent months: ACIS, station USC00306196. Records and recent months use complete months only.
How does September in Olean 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; Olean's is 73°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.