Coastal Flood Watch 4:00 PM High Wind Watch 7:00 PM

Nantucket, Massachusetts

Last updated: 8:29 PM CDT  ·  Refresh
14°C
Feels like 7°
Mostly Cloudy
▲ 17°  /  ▼ 14°
Wind
25 mph NE
Humidity
74%
Dew Point
10°
Pressure
30.43 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
61%
Sunrise
6:28 AM
Sunset
6:35 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Nantucket is currently mostly cloudy at 15°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:28AM · Sunset: 6:35PM.

Alerts

Coastal Flood Watch
Expires 4:00 PM
High Wind Watch
Expires 7:00 PM
25 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
14°
11%
10 PM
14°
19%
11 PM
14°
20%
12 AM
14°
20%
1 AM
14°
20%
2 AM
14°
3%
3 AM
14°
3%
4 AM
15°
3%
5 AM
15°
4%
6 AM
15°
4%
7 AM
15°
17%
8 AM
16°
31%
9 AM
16°
23%
10 AM
16°
10%
11 AM
16°
10%
12 PM
16°
14%
1 PM
16°
14%
2 PM
16°
10%
3 PM
16°
10%
4 PM
16°
12%
5 PM
16°
7%
6 PM
16°
8%
7 PM
16°
3%
8 PM
16°
6%
7-Day Forecast
Tonight
17° 14°
Mostly Cloudy.
Thu
17° 14°
Mostly Cloudy with a 23% chance of rain.
Fri
17° 15°
Heavy Rain, 90% chance.
Sat
18° 16°
Overcast with a 90% chance of rain.
Sun
18° 17°
Overcast with a 90% chance of rain.
Mon
18° 16°
Rain, 67% chance.
Tue
17° 16°
Overcast with a 32% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 14° Mostly Cloudy 11% 25 mph NE 74%
10 PM 14° Partly Cloudy 19% 25 mph NE 73%
11 PM 14° Partly Cloudy 20% 24 mph NE 72%
12 AM 14° Partly Cloudy 20% 25 mph NE 74%
1 AM 14° Mostly Cloudy 20% 26 mph NE 75%
2 AM 14° Mostly Cloudy 3% 27 mph NE 75%
3 AM 14° Mostly Cloudy 3% 28 mph NE 75%
4 AM 15° Mostly Cloudy 3% 28 mph NE 74%
5 AM 15° Mostly Cloudy 4% 29 mph NE 74%
6 AM 15° Mostly Cloudy 4% 29 mph NE 76%
7 AM 15° Overcast 17% 29 mph NE 77%
8 AM 16° Mostly Cloudy 31% 29 mph NE 75%
9 AM 16° Partly Cloudy 23% 29 mph NE 72%
10 AM 16° Partly Cloudy 10% 29 mph NE 72%
11 AM 16° Partly Cloudy 10% 29 mph NE 72%
12 PM 16° Mostly Cloudy 14% 29 mph NE 72%
1 PM 16° Mostly Cloudy 14% 28 mph NE 73%
2 PM 16° Mostly Cloudy 10% 28 mph NE 75%
3 PM 16° Mostly Cloudy 10% 27 mph NE 76%
4 PM 16° Overcast 12% 27 mph NE 76%
5 PM 16° Overcast 7% 27 mph NE 76%
6 PM 16° Overcast 8% 27 mph NE 77%
7 PM 16° Overcast 3% 27 mph NE 77%
8 PM 16° Overcast 6% 29 mph NE 80%
15-Day Forecast
Today
9/23
Mostly Cloudy
11%
14°
17°
Thu
9/24
Mostly Cloudy
23%
14°
17°
Fri
9/25
Heavy Rain
90%
15°
17°
Sat
9/26
Overcast
90%
16°
18°
Sun
9/27
Overcast
90%
17°
18°
Mon
9/28
Rain
67%
16°
18°
Tue
9/29
Overcast
32%
16°
17°
Wed
9/30
Overcast
18%
17°
18°
Thu
10/1
Rain
53%
18°
19°
Fri
10/2
Drizzle
65%
17°
19°
Sat
10/3
Drizzle
60%
16°
18°
Sun
10/4
Drizzle
60%
16°
18°
Mon
10/5
Drizzle
60%
15°
17°
Tue
10/6
Drizzle
60%
14°
16°
Wed
10/7
Drizzle
60%
14°
16°
25
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
10 AQI 1.9 µg/m³
O3
Ground-level ozone
Dominant
25 AQI 27 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 25 Good 25 10
Fri 26 Good 26 8
Sat 30 Good 30 13
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 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Wed Sep 23, 23:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE19 J/kg
MLCAPE5 J/kg
MUCAPE19 J/kg
SBCIN-1 J/kg
MLCIN-1 J/kg
Lifted Index14.2
Kinematics
0–6 km Shear36 kt
0–1 km Shear9 kt
Eff. Shear—
0–1 km SRH-27
0–3 km SRH-3
Eff. SRH—
Storm Motion6° @ 24 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index-30.8
Thermo & Levels
PWAT0.52 in
0–3 km LR3.7 °C/km
700–500 LR4.7 °C/km
Total Totals8.8
LCL966 hPa
LFC967 hPa
EL872 hPa
Freezing Lvl11,348 ft