Small Craft Advisory — Boston Harbor, AN 7:00 AM Coastal Flood Watch 4:00 PM Gale Warning — Boston Harbor, AN 7:00 PM

Suffolk County, Massachusetts, United States

Last updated: 8:29 PM CDT  ·  Refresh
14°C
Feels like 9°
Mostly Clear
▲ 16°  /  ▼ 12°
Wind
16 mph NE
Humidity
67%
Dew Point
9°
Pressure
30.48 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
14%
Sunrise
6:32 AM
Sunset
6:39 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Suffolk County is currently mostly clear at 14°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:32AM · Sunset: 6:39PM.

Alerts

Small Craft Advisory
Boston Harbor, AN
Expires 7:00 AM
Coastal Flood Watch
Expires 4:00 PM
Gale Warning
Boston Harbor, AN
Expires 7:00 PM
19 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
14°
11%
10 PM
13°
19%
11 PM
13°
20%
12 AM
13°
20%
1 AM
13°
20%
2 AM
13°
3%
3 AM
13°
3%
4 AM
13°
3%
5 AM
13°
3%
6 AM
13°
3%
7 AM
13°
3%
8 AM
13°
3%
9 AM
15°
3%
10 AM
15°
3%
11 AM
16°
3%
12 PM
16°
3%
1 PM
16°
3%
2 PM
16°
3%
3 PM
16°
3%
4 PM
16°
3%
5 PM
15°
3%
6 PM
15°
3%
7 PM
15°
3%
8 PM
15°
3%
7-Day Forecast
Tonight
16° 12°
Mostly Clear.
Thu
16° 12°
Mostly Cloudy with a 20% chance of rain.
Fri
18° 13°
Overcast with a 69% chance of rain.
Sat
17° 13°
Heavy Rain, 90% chance.
Sun
16° 13°
Heavy Rain, 90% chance.
Mon
16° 13°
Rain, 90% chance.
Tue
18° 13°
Overcast with a 25% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 14° Mostly Clear 11% 16 mph NE 67%
10 PM 13° Mostly Clear 19% 16 mph NE 66%
11 PM 13° Mostly Clear 20% 16 mph NE 66%
12 AM 13° Mostly Clear 20% 16 mph NE 72%
1 AM 13° Partly Cloudy 20% 16 mph NE 74%
2 AM 13° Partly Cloudy 3% 16 mph NE 77%
3 AM 13° Partly Cloudy 3% 16 mph NE 80%
4 AM 13° Partly Cloudy 3% 16 mph NE 82%
5 AM 13° Partly Cloudy 3% 17 mph NE 82%
6 AM 13° Partly Cloudy 3% 17 mph NE 82%
7 AM 13° Partly Cloudy 3% 18 mph NE 81%
8 AM 13° Partly Cloudy 3% 19 mph NE 73%
9 AM 15° Mostly Cloudy 3% 19 mph NE 70%
10 AM 15° Mostly Cloudy 3% 19 mph NE 69%
11 AM 16° Mostly Cloudy 3% 19 mph NE 68%
12 PM 16° Mostly Cloudy 3% 19 mph NE 68%
1 PM 16° Partly Cloudy 3% 19 mph NE 68%
2 PM 16° Partly Cloudy 3% 20 mph NE 72%
3 PM 16° Partly Cloudy 3% 19 mph NE 69%
4 PM 16° Partly Cloudy 3% 18 mph NE 66%
5 PM 15° Partly Cloudy 3% 17 mph NE 65%
6 PM 15° Mostly Cloudy 3% 17 mph NE 65%
7 PM 15° Mostly Cloudy 3% 16 mph NE 65%
8 PM 15° Mostly Cloudy 3% 17 mph NE 67%
15-Day Forecast
Today
9/23
Mostly Clear
11%
12°
16°
Thu
9/24
Mostly Cloudy
20%
12°
16°
Fri
9/25
Overcast
69%
13°
18°
Sat
9/26
Heavy Rain
90%
13°
17°
Sun
9/27
Heavy Rain
90%
13°
16°
Mon
9/28
Rain
90%
13°
16°
Tue
9/29
Overcast
25%
13°
18°
Wed
9/30
Partly Cloudy
18%
13°
22°
Thu
10/1
Rain
53%
15°
22°
Fri
10/2
Drizzle
47%
14°
22°
Sat
10/3
Drizzle
60%
13°
22°
Sun
10/4
Drizzle
60%
13°
22°
Mon
10/5
Drizzle
60%
12°
19°
Tue
10/6
Drizzle
90%
10°
18°
Wed
10/7
Drizzle
90%
10°
18°
19
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
9 AQI 1.8 µg/m³
O3
Ground-level ozone
Dominant
19 AQI 22 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 19 Good 19 9
Fri 20 Good 20 11
Sat 22 Good 22 19
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 Wed Sep 23, 23:00'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
SBCAPE0 J/kg
MLCAPE5 J/kg
MUCAPE0 J/kg
SBCIN—
MLCIN0 J/kg
Lifted Index13.1
Kinematics
0–6 km Shear5 kt
0–1 km Shear13 kt
Eff. Shear—
0–1 km SRH45
0–3 km SRH28
Eff. SRH—
Storm Motion94° @ 24 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index-33.6
Thermo & Levels
PWAT0.35 in
0–3 km LR3.8 °C/km
700–500 LR5.6 °C/km
Total Totals13.6
LCL950 hPa
LFC—
EL—
Freezing Lvl11,155 ft