Marine Warning — Cape Cod Bay, AN, ANZ232, ANZ233, ANZ234, ANZ235, ANZ236, ANZ254, ANZ255, ANZ256 4:30 PM High Surf Advisory — Southern Bristol, MA, Southern Plymouth, MA, Barnstable, MA, Dukes, MA, Nantucket, MA, Washington, RI, Newport, RI, Block Island, RI 7:00 PM

Dukes County, Massachusetts, United States

Last updated: 4:08 PM CDT  ·  Refresh
22°C
Feels like 21°
Rain
▲ 25°  /  ▼ 20°
Wind
18 mph SSE
Humidity
91%
Dew Point
20°
Pressure
29.83 inHg
Visibility
10 mi
UV Index
2.1
Cloud Cover
96%
Sunrise
5:27 AM
Sunset
8:10 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Dukes County is currently rain at 22°C. Precipitation is likely — peak probability 90% around 6 PM. Atmospheric instability is elevated (CAPE up to 846 J/kg) — isolated convective development possible. Sunrise: 5:27AM · Sunset: 8:10PM.

Alerts

Marine Warning
Cape Cod Bay, AN, ANZ232, ANZ233, ANZ234, ANZ235, ANZ236, ANZ254, ANZ255, ANZ256
Expires 4:30 PM
High Surf Advisory
Southern Bristol, MA, Southern Plymouth, MA, Barnstable, MA, Dukes, MA, Nantucket, MA, Washington, RI, Newport, RI, Block Island, RI
Expires 7:00 PM
63 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
84%
6 PM
22°
90%
7 PM
23°
90%
8 PM
23°
90%
9 PM
22°
90%
10 PM
22°
90%
11 PM
22°
90%
12 AM
22°
74%
1 AM
22°
63%
2 AM
22°
69%
3 AM
21°
64%
4 AM
21°
64%
5 AM
22°
72%
6 AM
22°
72%
7 AM
22°
64%
8 AM
23°
64%
9 AM
23°
64%
10 AM
24°
64%
11 AM
24°
64%
12 PM
24°
64%
1 PM
24°
63%
2 PM
24°
64%
3 PM
24°
54%
4 PM
24°
49%
7-Day Forecast
Today
25° 20°
Heavy Rain, 90% chance.
Wed
25° 21°
Rain, 72% chance.
Thu
23° 16°
Drizzle, 35% chance.
Fri
23° 16°
Partly Cloudy.
Sat
22° 18°
Clear.
Sun
22° 17°
Drizzle, 60% chance.
Mon
23° 18°
Drizzle, 60% chance.
TimeTempConditionsPrecipWindHumidity
Now 22° Rain 84% 18 mph SSE 91%
6 PM 22° Rain 90% 21 mph SSE 95%
7 PM 23° Heavy Rain 90% 20 mph S 96%
8 PM 23° Heavy Rain 90% 19 mph S 97%
9 PM 22° Overcast 90% 19 mph S 97%
10 PM 22° Heavy Rain 90% 20 mph SSW 97%
11 PM 22° Overcast 90% 20 mph SSW 97%
12 AM 22° Overcast 74% 19 mph SSW 96%
1 AM 22° Overcast 63% 19 mph SSW 95%
2 AM 22° Overcast 69% 19 mph SSW 95%
3 AM 21° Overcast 64% 20 mph SSW 95%
4 AM 21° Overcast 64% 20 mph SSW 96%
5 AM 22° Rain 72% 20 mph SSW 96%
6 AM 22° Rain 72% 19 mph SSW 95%
7 AM 22° Rain 64% 18 mph SSW 94%
8 AM 23° Rain 64% 16 mph SSW 93%
9 AM 23° Rain 64% 18 mph SSW 92%
10 AM 24° Mostly Cloudy 64% 18 mph SSW 91%
11 AM 24° Mostly Cloudy 64% 19 mph SSW 90%
12 PM 24° Mostly Cloudy 64% 18 mph SSW 90%
1 PM 24° Mostly Cloudy 63% 18 mph SSW 89%
2 PM 24° Mostly Cloudy 64% 18 mph SSW 88%
3 PM 24° Mostly Cloudy 54% 18 mph SSW 89%
4 PM 24° Mostly Cloudy 49% 21 mph SSW 90%
15-Day Forecast
Today
7/21
Heavy Rain
90%
20°
25°
Wed
7/22
Rain
72%
21°
25°
Thu
7/23
Drizzle
35%
16°
23°
Fri
7/24
Partly Cloudy
8%
16°
23°
Sat
7/25
Clear
19%
18°
22°
Sun
7/26
Drizzle
60%
17°
22°
Mon
7/27
Drizzle
60%
18°
23°
Tue
7/28
Drizzle
60%
20°
23°
Wed
7/29
Drizzle
60%
19°
24°
Thu
7/30
Drizzle
60%
19°
25°
Fri
7/31
Drizzle
60%
20°
23°
Sat
8/1
Drizzle
60%
20°
23°
Sun
8/2
Drizzle
60%
20°
23°
Mon
8/3
Drizzle
60%
21°
24°
Tue
8/4
Drizzle
60%
21°
24°
63
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
63 AQI 15.3 µg/m³
O3
Ground-level ozone
34 AQI 38 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Wed 63 Moderate 34 63
Thu 34 Good 34 34
Fri 28 Good 28 28
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 Tue Jul 21, 19:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE27 J/kg
MLCAPE10 J/kg
MUCAPE104 J/kg
SBCIN-134 J/kg
MLCIN0 J/kg
Lifted Index0.1
Kinematics
0–6 km Shear32 kt
0–1 km Shear17 kt
Eff. Shear19 kt
0–1 km SRH76
0–3 km SRH47
Eff. SRH-54
Storm Motion186° @ 38 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index32.0
Thermo & Levels
PWAT1.82 in
0–3 km LR5.1 °C/km
700–500 LR5.3 °C/km
Total Totals43.9
LCL975 hPa
LFC737 hPa
EL508 hPa
Freezing Lvl14,380 ft