Nantucket, MA weather in September
Nantucket is mild in September, with frequent rain: highs average 70°F and nights drop to about 57°F. There are about 13 days with rain.
- Normal high
- 70°F
- Normal low
- 57°F
- Wet days
- 13
- 3.6 in total
- Daylight
- 12.5 h
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 74°F | 67°F |
| Normal low | 60°F | 53°F |
| Chance of a wet day | 42% | 42% |
| Sunrise / sunset | 6:06 am / 7:13 pm | 6:36 am / 6:24 pm |
| Daylight | 13.1 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical September day
- 6 am58°Fdew point 55°F
- 9 am67°Fdew point 57°F
- Noon71°Fdew point 56°F
- 3 pm71°Fdew point 56°F
- 6 pm65°Fdew point 57°F
- 9 pm60°Fdew point 56°F
NOAA hourly normals (local standard time) from Plymouth Muni Airport (54 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F (temperature only: no humidity station nearby)27 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain (temperature and rain only)0 of 30
- Hot dayshigh 90°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow13 of 30
- Notable rainat least 0.10 in5 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 3.6 in; a dry September brings about 2.2 in and a wet one about 3.9 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202005: average high 74°F
- Coolest September2000: average high 69°F
- Wettest September2017: 11.1 in
- Driest September2013: 0.6 in
- Highest reading86°F (September 4, 2018)
- Lowest reading37°F (September 30, 2000)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 76°F | 70°F | 62°F |
| Normal low | 62°F | 57°F | 49°F |
| Wet days | 13 | 13 | 13 |
| Comfortable days | 27 | 27 | 11 |
| Daylight | 13.8 h | 12.5 h | 11.1 h |
Highs change by -6°F from August and -8°F into October.
Nearby alternatives in September
- Warmer: Newport, RI64 mi · high 76°F · 9 wet days
- Drier: Edgartown, MA23 mi · high 74°F · 9 wet days
How Nantucket ranks in September
- Normal high345th warmest of 378 cities; 9th of 9 in Massachusetts
- Wet days348th driest of 378
What to pack for Nantucket in September
- A rain jacket or umbrella – rain on about 13 days
Heating and cooling
September has 83 heating degree days and 44 cooling degree days (base 65°F), 2% of the year's total heating and cooling demand.
Questions
How hot is Nantucket in September?
The normal high is 70°F and the normal low is 57°F. From 1991 to 2020 the hottest September reading was 86°F (most recently on September 4, 2018).
Does it rain a lot in Nantucket in September?
About 13 days in September have at least 0.01 in of precipitation, and the normal total is 3.6 in. The wettest September in 1991-2020 was in 2017 (11.1 in); the driest was in 2013 (0.6 in).
Is September a good time to visit Nantucket?
September ranks 4th of 12 months on our comfort score for Nantucket (85 out of 100). It has about 27 comfortable days (judged by temperature only). The best months are July and August.
Where the numbers come from
- Temperature, rain and frost dates: Nantucket Mem Airport (USW00014756), 2.9 mi SE of the city center, 45 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Edgartown (USC00192501), 23 mi WNW of the city center, 30 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Plymouth Muni Airport (USW00054769), 54 mi NW of the city center, 149 ft (128 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Not available for this location: cloud cover and daily humidity and wind (no station close enough or similar enough in elevation).