Coastal Flood Advisory — Eastern Essex, MA, Suffolk, MA, Eastern Norfolk, MA, Eastern Plymouth, MA, Barnstable, MA, Dukes, MA, Nantucket, MA 11:00 PM

Nantucket, Massachusetts

Last updated: 5:48 PM CDT  ·  Refresh
18°C
Feels like 16°
Mostly Cloudy
▲ 18°  /  ▼ 16°
Wind
14 mph ENE
Humidity
94%
Dew Point
17°
Pressure
29.77 inHg
Visibility
8 mi
UV Index
0.0
Cloud Cover
85%
Sunrise
6:33 AM
Sunset
6:28 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Nantucket is currently mostly cloudy at 18°C. Precipitation is likely — peak probability 65% around 6 PM. Sunrise: 6:33AM · Sunset: 6:28PM.

Alerts

Coastal Flood Advisory
Eastern Essex, MA, Suffolk, MA, Eastern Norfolk, MA, Eastern Plymouth, MA, Barnstable, MA, Dukes, MA, Nantucket, MA
Expires 11:00 PM
36 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
18°
42%
7 PM
17°
36%
8 PM
17°
43%
9 PM
17°
29%
10 PM
17°
34%
11 PM
17°
34%
12 AM
17°
43%
1 AM
17°
43%
2 AM
17°
44%
3 AM
17°
40%
4 AM
17°
54%
5 AM
17°
58%
6 AM
16°
45%
7 AM
17°
45%
8 AM
17°
45%
9 AM
18°
42%
10 AM
18°
42%
11 AM
18°
52%
12 PM
18°
52%
1 PM
18°
52%
2 PM
18°
51%
3 PM
18°
51%
4 PM
18°
42%
5 PM
18°
52%
7-Day Forecast
Tonight
18° 16°
Mostly Cloudy with a 42% chance of rain.
Mon
18° 16°
Overcast with a 64% chance of rain.
Tue
17° 14°
Mostly Cloudy with a 41% chance of rain.
Wed
16° 15°
Partly Cloudy.
Thu
17° 16°
Mostly Clear.
Fri
18° 16°
Clear with a 30% chance of rain.
Sat
17° 14°
Rain, 64% chance.
TimeTempConditionsPrecipWindHumidity
Now 18° Mostly Cloudy 42% 14 mph ENE 94%
7 PM 17° Fog 36% 16 mph ENE 95%
8 PM 17° Fog 43% 16 mph ENE 96%
9 PM 17° Fog 29% 16 mph ENE 96%
10 PM 17° Fog 34% 15 mph ENE 96%
11 PM 17° Fog 34% 15 mph ENE 96%
12 AM 17° Fog 43% 15 mph ENE 97%
1 AM 17° Fog 43% 14 mph ENE 97%
2 AM 17° Fog 44% 13 mph E 97%
3 AM 17° Fog 40% 13 mph E 97%
4 AM 17° Rain 54% 12 mph E 97%
5 AM 17° Fog 58% 12 mph E 97%
6 AM 16° Rain 45% 11 mph E 97%
7 AM 17° Rain 45% 11 mph E 97%
8 AM 17° Rain 45% 11 mph ESE 96%
9 AM 18° Overcast 42% 11 mph ESE 95%
10 AM 18° Overcast 42% 11 mph ESE 94%
11 AM 18° Overcast 52% 10 mph ESE 93%
12 PM 18° Mostly Cloudy 52% 11 mph SE 94%
1 PM 18° Mostly Cloudy 52% 12 mph SE 92%
2 PM 18° Mostly Cloudy 51% 11 mph SE 93%
3 PM 18° Mostly Cloudy 51% 11 mph SE 94%
4 PM 18° Mostly Cloudy 42% 10 mph SSE 94%
5 PM 18° Mostly Cloudy 52% 10 mph SSE 94%
15-Day Forecast
Today
9/27
Mostly Cloudy
42%
16°
18°
Mon
9/28
Overcast
64%
16°
18°
Tue
9/29
Mostly Cloudy
41%
14°
17°
Wed
9/30
Partly Cloudy
15%
15°
16°
Thu
10/1
Mostly Clear
3%
16°
17°
Fri
10/2
Clear
30%
16°
18°
Sat
10/3
Rain
64%
14°
17°
Sun
10/4
Drizzle
60%
13°
15°
Mon
10/5
Rain
90%
13°
16°
Tue
10/6
Drizzle
60%
13°
15°
Wed
10/7
Drizzle
60%
13°
14°
Thu
10/8
Drizzle
60%
13°
14°
Fri
10/9
Drizzle
60%
13°
14°
Sat
10/10
Drizzle
60%
13°
14°
Sun
10/11
Clear
60%
13°
14°
36
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
35 AQI 6.4 µg/m³
O3
Ground-level ozone
Dominant
36 AQI 40 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 36 Good 36 35
Tue 37 Good 37 28
Wed 26 Good 22 26
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Sun Sep 27, 21:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE90 J/kg
MUCAPE559 J/kg
SBCIN—
MLCIN-22 J/kg
Lifted Index3.1
Kinematics
0–6 km Shear24 kt
0–1 km Shear17 kt
Eff. Shear9 kt
0–1 km SRH90
0–3 km SRH94
Eff. SRH21
Storm Motion163° @ 14 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index29.9
Thermo & Levels
PWAT1.50 in
0–3 km LR4.5 °C/km
700–500 LR5.6 °C/km
Total Totals44.6
LCL995 hPa
LFC—
EL—
Freezing Lvl12,631 ft