Nantucket weather in September: Nantucket, Massachusetts: normal highs, lows, rain and records for September
Nantucket in September has a normal high of 70°F and a normal low of 57°F, a daily mean of 64°F, falling from 74°F on the 1st to 67°F by the 30th. Measurable precipitation falls on 13 days in a normal September, 3.59 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 21°C and low of 14°C, 91 mm of precipitation in September.
- NOAA stationNantucket Mem Airport
- Station IDUSW00014756
- Location41.25°N 70.06°W
- Elevation45 ft (14 m)
- From the center2 miles
- Population (town)14,670
- Census place10,837
- Jan 40° 27°
- Feb 40° 27°
- Mar 44° 32°
- Apr 52° 39°
- May 61° 47°
- Jun 69° 56°
- Jul 75° 63°
- Aug 76° 62°
- Sep 70° 57°
- Oct 62° 49°
- Nov 53° 40°
- Dec 45° 32°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Nantucket in September?
The normal high is 70°F and the normal low 57°F, for a daily mean of 63.7°F. September is 5.3°F cooler than August and 8.5°F warmer than October. September is the 3rd warmest month of the year in Nantucket and the 6th wettest. Across the month the normal high falls 7°F, from 74°F on September 1 to 67°F on September 30. From one year to the next September's mean temperature typically moves about 1.6°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 62°F and 65°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 42%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 74°F | 60°F | 42% | 15% |
| September 8 | 72°F | 59°F | 42% | 16% |
| September 15 | 71°F | 57°F | 42% | 17% |
| September 22 | 69°F | 56°F | 42% | 19% |
| September 30 | 67°F | 53°F | 42% | 21% |
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 | 74°F | 60°F | 42% | 15% | 13 h 10 min |
| September 2 | 74°F | 60°F | 42% | 15% | 13 h 10 min |
| September 3 | 73°F | 60°F | 42% | 15% | 13 h |
| September 4 | 73°F | 60°F | 42% | 15% | 13 h |
| September 5 | 73°F | 59°F | 42% | 15% | 13 h |
| September 6 | 73°F | 59°F | 42% | 15% | 13 h |
| September 7 | 73°F | 59°F | 42% | 15% | 12 h 50 min |
| September 8 | 72°F | 59°F | 42% | 16% | 12 h 50 min |
| September 9 | 72°F | 59°F | 42% | 16% | 12 h 50 min |
| September 10 | 72°F | 58°F | 41% | 16% | 12 h 50 min |
| September 11 | 72°F | 58°F | 41% | 16% | 12 h 40 min |
| September 12 | 71°F | 58°F | 41% | 16% | 12 h 40 min |
| September 13 | 71°F | 58°F | 41% | 16% | 12 h 40 min |
| September 14 | 71°F | 58°F | 41% | 17% | 12 h 40 min |
| September 15 | 71°F | 57°F | 42% | 17% | 12 h 30 min |
| September 16 | 70°F | 57°F | 42% | 17% | 12 h 30 min |
| September 17 | 70°F | 57°F | 42% | 17% | 12 h 30 min |
| September 18 | 70°F | 57°F | 42% | 18% | 12 h 20 min |
| September 19 | 70°F | 56°F | 42% | 18% | 12 h 20 min |
| September 20 | 69°F | 56°F | 42% | 18% | 12 h 20 min |
| September 21 | 69°F | 56°F | 42% | 18% | 12 h 20 min |
| September 22 | 69°F | 56°F | 42% | 19% | 12 h 10 min |
| September 23 | 69°F | 55°F | 42% | 19% | 12 h 10 min |
| September 24 | 68°F | 55°F | 42% | 19% | 12 h 10 min |
| September 25 | 68°F | 55°F | 42% | 20% | 12 h 10 min |
| September 26 | 68°F | 55°F | 42% | 20% | 12 h |
| September 27 | 68°F | 54°F | 42% | 20% | 12 h |
| September 28 | 67°F | 54°F | 42% | 20% | 12 h |
| September 29 | 67°F | 54°F | 42% | 20% | 11 h 50 min |
| September 30 | 67°F | 53°F | 42% | 21% | 11 h 50 min |
- Normal high
- 70°FSeptember average
- Normal low
- 57°FSeptember average
- Precipitation
- 3.59 inmonth total
- Days with precipitation
- 130.01 inch or more
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 19
- Days at 80°F or more
- 1
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014756; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Nantucket in September?
On a given September day the chance of 0.01 inch or more is 42% on average, highest around September 29 (42%). In all, 3.59 in falls on 13 days of a normal September, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014756.
What are the records for September in Nantucket?
The warmest September temperature on this station's record (since 1948) is 86°F, on September 9, 1971; the coldest is 34°F, on September 26, 1973. The wettest September brought 11.09 in (2017).
The September mean against the 1991-2020 normal of 63.7°F: 2021 70.0°F (+6.3), 2022 67.5°F (+3.8), 2023 65.1°F (+1.4), 2024 64.0°F (+0.3), 2026 63.8°F (+0.1). 5 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 70.0°F | +6.3°F | – |
| 2022 | 67.5°F | +3.8°F | 1.26 in |
| 2023 | 65.1°F | +1.4°F | – |
| 2024 | 64.0°F | +0.3°F | 5.76 in |
| 2026 | 63.8°F | +0.1°F | 6.00 in |
Source: records: ACIS, station USW00014756; recent months: ACIS, station USW00014756. Records and recent months use complete months only.
How does September in Nantucket compare across Massachusetts?
Across the 35 places PlainClimate covers in Massachusetts, September normal highs run from 70°F in East Sandwich to 78°F in Maynard; Nantucket's is 70°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Nantucket in August76°F by day, 62°F at night
- Nantucket in October62°F by day, 49°F at night
- Nantucket through the yearEvery month, frost dates, records and recent years
- Massachusetts in SeptemberThe statewide normal and the warmest and coolest places
- Maynard: Massachusetts's warmest Septembernormal high 78°F