Watertown weather in September: Watertown, New York: normal highs, lows, rain and records for September
Watertown in September has a normal high of 71°F and a normal low of 49°F, a daily mean of 60°F, falling from 76°F on the 1st to 65°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 3.56 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 9°C, 90 mm of precipitation in September.
- NOAA stationWatertown International Airport
- Station IDUSW00094790
- Location43.99°N 76.02°W
- Elevation318 ft (97 m)
- From the center6 miles
- Population24,038
- Jan 30° 10°
- Feb 31° 11°
- Mar 40° 21°
- Apr 54° 33°
- May 66° 44°
- Jun 75° 53°
- Jul 79° 59°
- Aug 78° 57°
- Sep 71° 49°
- Oct 58° 39°
- Nov 47° 30°
- Dec 36° 19°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Watertown in September?
The normal high is 71°F and the normal low 49°F, for a daily mean of 60.0°F. September is 7.5°F cooler than August and 11.2°F warmer than October. September is the 4th warmest month of the year in Watertown and the 2nd wettest. Across the month the normal high falls 11°F, from 76°F on September 1 to 65°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 58°F and 62°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 | 53°F | 33% | 20% |
| September 8 | 74°F | 51°F | 35% | 21% |
| September 15 | 72°F | 49°F | 37% | 23% |
| September 22 | 69°F | 47°F | 39% | 25% |
| September 30 | 65°F | 44°F | 43% | 27% |
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 | 53°F | 33% | 20% | 13 h 20 min |
| September 2 | 76°F | 53°F | 33% | 20% | 13 h 10 min |
| September 3 | 76°F | 53°F | 34% | 20% | 13 h 10 min |
| September 4 | 75°F | 52°F | 34% | 20% | 13 h 10 min |
| September 5 | 75°F | 52°F | 34% | 21% | 13 h |
| September 6 | 75°F | 52°F | 34% | 21% | 13 h |
| September 7 | 75°F | 52°F | 35% | 21% | 13 h |
| September 8 | 74°F | 51°F | 35% | 21% | 13 h |
| September 9 | 74°F | 51°F | 35% | 21% | 12 h 50 min |
| September 10 | 74°F | 51°F | 35% | 22% | 12 h 50 min |
| September 11 | 73°F | 50°F | 36% | 22% | 12 h 50 min |
| September 12 | 73°F | 50°F | 36% | 22% | 12 h 40 min |
| September 13 | 73°F | 50°F | 36% | 22% | 12 h 40 min |
| September 14 | 72°F | 49°F | 36% | 23% | 12 h 40 min |
| September 15 | 72°F | 49°F | 37% | 23% | 12 h 40 min |
| September 16 | 71°F | 49°F | 37% | 23% | 12 h 30 min |
| September 17 | 71°F | 48°F | 37% | 23% | 12 h 30 min |
| September 18 | 71°F | 48°F | 38% | 23% | 12 h 30 min |
| September 19 | 70°F | 48°F | 38% | 24% | 12 h 20 min |
| September 20 | 70°F | 47°F | 38% | 24% | 12 h 20 min |
| September 21 | 69°F | 47°F | 39% | 24% | 12 h 20 min |
| September 22 | 69°F | 47°F | 39% | 25% | 12 h 10 min |
| September 23 | 68°F | 46°F | 40% | 25% | 12 h 10 min |
| September 24 | 68°F | 46°F | 40% | 25% | 12 h 10 min |
| September 25 | 67°F | 46°F | 41% | 25% | 12 h 10 min |
| September 26 | 67°F | 46°F | 41% | 26% | 12 h |
| September 27 | 67°F | 45°F | 42% | 26% | 12 h |
| September 28 | 66°F | 45°F | 42% | 26% | 12 h |
| September 29 | 66°F | 45°F | 43% | 27% | 11 h 50 min |
| September 30 | 65°F | 44°F | 43% | 27% | 11 h 50 min |
- Normal high
- 71°FSeptember average
- Normal low
- 49°FSeptember average
- Precipitation
- 3.56 inmonth total
- Days with precipitation
- 110.01 inch or more
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 18
- Days at 80°F or more
- 5
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094790; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Watertown in September?
On a given September day the chance of 0.01 inch or more is 37% on average, highest around September 30 (43%). In all, 3.56 in falls on 11 days of a normal September, 1 of them with an inch or more.
In a normal September in Watertown, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094790.
How humid and windy is Watertown in September?
At 3 p.m. the normal temperature is 63°F with 60% relative humidity and a dew point of 49°F; at 6 a.m. it is 49°F with 87% humidity. The wind averages 7.3 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 49°F | 46°F | 87% | 5.7 mph | – |
| 9 a.m. | 58°F | 50°F | 74% | 8.3 mph | – |
| noon | 62°F | 49°F | 62% | 10.4 mph | – |
| 3 p.m. | 63°F | 49°F | 60% | 10.2 mph | – |
| 6 p.m. | 58°F | 49°F | 74% | 6.0 mph | – |
| 9 p.m. | 53°F | 48°F | 81% | 6.1 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094790. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Watertown?
The warmest September temperature on this station's record (since 1949) is 96°F, on September 4, 1953; the coldest is 22°F, on September 30, 1991. The wettest September brought 7.42 in (1975).
The September mean against the 1991-2020 normal of 60.0°F: 2021 61.7°F (+1.7), 2022 60.7°F (+0.7), 2023 61.8°F (+1.8), 2024 63.4°F (+3.4), 2025 60.6°F (+0.6), 2026 59.5°F (−0.5). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 61.7°F | +1.7°F | 3.20 in |
| 2022 | 60.7°F | +0.7°F | 2.90 in |
| 2023 | 61.8°F | +1.8°F | 1.59 in |
| 2024 | 63.4°F | +3.4°F | 2.08 in |
| 2025 | 60.6°F | +0.6°F | 1.57 in |
| 2026 | 59.5°F | −0.5°F | 2.42 in |
Source: records: ACIS, station USW00094790; recent months: ACIS, station USW00094790. Records and recent months use complete months only.
How does September in Watertown 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; Watertown's is 71°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.