High Surf Advisory — Eastern Essex, MA, Suffolk, MA, Eastern Norfolk, MA, Eastern Plymouth, MA, Barnstable, MA, Dukes, MA, Nantucket, MA 7:00 PM Coastal Flood Advisory — Eastern Essex, MA, Suffolk, MA, Eastern Norfolk, MA, Eastern Plymouth, MA, Barnstable, MA, Dukes, MA, Nantucket, MA 11:00 PM Flood Watch 1:00 AM

Barnstable County, Massachusetts, United States

Last updated: 5:47 PM CDT  ·  Refresh
18°C
Feels like 17°
Overcast
▲ 18°  /  ▼ 16°
Wind
12 mph ENE
Humidity
94%
Dew Point
17°
Pressure
29.78 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
87%
Sunrise
6:33 AM
Sunset
6:29 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Barnstable County is currently overcast at 18°C. Precipitation is likely — peak probability 82% around 12 AM. Sunrise: 6:33AM · Sunset: 6:29PM.

Alerts

High Surf Advisory
Eastern Essex, MA, Suffolk, MA, Eastern Norfolk, MA, Eastern Plymouth, MA, Barnstable, MA, Dukes, MA, Nantucket, MA
Expires 7:00 PM
Coastal Flood Advisory
Eastern Essex, MA, Suffolk, MA, Eastern Norfolk, MA, Eastern Plymouth, MA, Barnstable, MA, Dukes, MA, Nantucket, MA
Expires 11:00 PM
Flood Watch
Expires 1:00 AM
39 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
18°
37%
7 PM
18°
43%
8 PM
17°
43%
9 PM
17°
43%
10 PM
17°
40%
11 PM
17°
39%
12 AM
17°
81%
1 AM
17°
81%
2 AM
17°
81%
3 AM
17°
81%
4 AM
17°
74%
5 AM
17°
74%
6 AM
17°
70%
7 AM
17°
66%
8 AM
17°
54%
9 AM
18°
59%
10 AM
18°
59%
11 AM
18°
59%
12 PM
18°
55%
1 PM
18°
55%
2 PM
18°
56%
3 PM
18°
56%
4 PM
18°
46%
5 PM
18°
52%
7-Day Forecast
Tonight
18° 16°
Fog with a 43% chance of rain.
Mon
19° 16°
Rain, 81% chance.
Tue
18° 14°
Overcast with a 56% chance of rain.
Wed
18° 15°
Mostly Cloudy with a 21% chance of rain.
Thu
20° 16°
Mostly Clear.
Fri
21° 16°
Clear.
Sat
18° 13°
Rain, 29% chance.
TimeTempConditionsPrecipWindHumidity
Now 18° Overcast 37% 12 mph ENE 94%
7 PM 18° Fog 43% 13 mph ENE 95%
8 PM 17° Fog 43% 13 mph ENE 96%
9 PM 17° Fog 43% 13 mph ENE 96%
10 PM 17° Fog 40% 13 mph ENE 97%
11 PM 17° Fog 39% 13 mph NE 97%
12 AM 17° Fog 81% 12 mph NE 98%
1 AM 17° Fog 81% 12 mph ENE 98%
2 AM 17° Fog 81% 12 mph ENE 98%
3 AM 17° Fog 81% 12 mph ENE 98%
4 AM 17° Fog 74% 11 mph ENE 98%
5 AM 17° Fog 74% 11 mph ENE 98%
6 AM 17° Rain 70% 11 mph ENE 98%
7 AM 17° Rain 66% 11 mph ENE 98%
8 AM 17° Rain 54% 10 mph E 97%
9 AM 18° Overcast 59% 9 mph E 96%
10 AM 18° Overcast 59% 9 mph E 94%
11 AM 18° Overcast 59% 8 mph E 96%
12 PM 18° Fog 55% 6 mph ESE 96%
1 PM 18° Fog 55% 6 mph ESE 94%
2 PM 18° Fog 56% 6 mph ESE 94%
3 PM 18° Fog 56% 6 mph SE 95%
4 PM 18° Fog 46% 6 mph SE 95%
5 PM 18° Fog 52% 6 mph SE 95%
15-Day Forecast
Today
9/27
Fog
43%
16°
18°
Mon
9/28
Rain
81%
16°
19°
Tue
9/29
Overcast
56%
14°
18°
Wed
9/30
Mostly Cloudy
21%
15°
18°
Thu
10/1
Mostly Clear
3%
16°
20°
Fri
10/2
Clear
17%
16°
21°
Sat
10/3
Rain
29%
13°
18°
Sun
10/4
Clear
60%
12°
16°
Mon
10/5
Rain
90%
12°
16°
Tue
10/6
Drizzle
60%
13°
16°
Wed
10/7
Drizzle
60%
12°
14°
Thu
10/8
Drizzle
60%
12°
15°
Fri
10/9
Drizzle
60%
12°
15°
Sat
10/10
Drizzle
60%
12°
15°
Sun
10/11
Clear
60%
12°
15°
39
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

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

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
39 AQI 7.0 µg/m³
O3
Ground-level ozone
35 AQI 39 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 39 Good 35 39
Tue 33 Good 33 31
Wed 25 Good 25 24
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
MLCAPE24 J/kg
MUCAPE285 J/kg
SBCIN—
MLCIN0 J/kg
Lifted Index2.4
Kinematics
0–6 km Shear26 kt
0–1 km Shear20 kt
Eff. Shear13 kt
0–1 km SRH132
0–3 km SRH127
Eff. SRH36
Storm Motion155° @ 17 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index26.9
Thermo & Levels
PWAT1.35 in
0–3 km LR4.5 °C/km
700–500 LR5.7 °C/km
Total Totals44.7
LCL995 hPa
LFC—
EL—
Freezing Lvl12,605 ft