Dartmouth, Massachusetts

Last updated: 5:02 PM CDT  ·  Refresh
21°C
Feels like 23°
Mostly Cloudy
▲ 21°  /  ▼ 17°
Wind
4 mph NNW
Humidity
96%
Dew Point
20°
Pressure
29.72 inHg
Visibility
4 mi
UV Index
1.7
Cloud Cover
81%
Sunrise
6:22 AM
Sunset
6:56 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Dartmouth is currently mostly cloudy at 20°C. Precipitation is likely — peak probability 63% around 6 PM. Sunrise: 6:22AM · Sunset: 6:56PM.

Alerts

No active alerts for this location.
31 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
21°
63%
7 PM
21°
29%
8 PM
21°
9%
9 PM
19°
9%
10 PM
19°
16%
11 PM
19°
16%
12 AM
19°
13%
1 AM
19°
14%
2 AM
19°
9%
3 AM
19°
18%
4 AM
19°
18%
5 AM
18°
25%
6 AM
18°
30%
7 AM
18°
28%
8 AM
18°
25%
9 AM
18°
29%
10 AM
19°
39%
11 AM
19°
30%
12 PM
19°
29%
1 PM
21°
29%
2 PM
22°
22%
3 PM
21°
21%
4 PM
21°
21%
5 PM
21°
12%
7-Day Forecast
Tonight
21° 17°
Mostly Cloudy with a 63% chance of rain.
Mon
23° 14°
Partly Cloudy with a 30% chance of rain.
Tue
21° 12°
Mostly Clear.
Wed
21° 12°
Partly Cloudy.
Thu
23° 17°
Mostly Clear with a 25% chance of rain.
Fri
21° 16°
Rain, 78% chance.
Sat
23° 15°
Drizzle, 71% chance.
TimeTempConditionsPrecipWindHumidity
Now 21° Mostly Cloudy 63% 4 mph NNW 96%
7 PM 21° Partly Cloudy 29% 4 mph NW 97%
8 PM 21° Partly Cloudy 9% 4 mph NW 98%
9 PM 19° Partly Cloudy 9% 4 mph WNW 97%
10 PM 19° Partly Cloudy 16% 5 mph W 97%
11 PM 19° Partly Cloudy 16% 5 mph W 98%
12 AM 19° Partly Cloudy 13% 6 mph WSW 98%
1 AM 19° Partly Cloudy 14% 6 mph WSW 98%
2 AM 19° Partly Cloudy 9% 6 mph WSW 98%
3 AM 19° Partly Cloudy 18% 6 mph WSW 97%
4 AM 19° Partly Cloudy 18% 6 mph WSW 97%
5 AM 18° Mostly Cloudy 25% 6 mph W 96%
6 AM 18° Partly Cloudy 30% 6 mph WNW 94%
7 AM 18° Mostly Cloudy 28% 7 mph WNW 90%
8 AM 18° Mostly Cloudy 25% 7 mph NW 85%
9 AM 18° Mostly Cloudy 29% 8 mph NW 76%
10 AM 19° Mostly Cloudy 39% 9 mph NW 67%
11 AM 19° Partly Cloudy 30% 10 mph NW 60%
12 PM 19° Partly Cloudy 29% 10 mph NW 58%
1 PM 21° Partly Cloudy 29% 10 mph NW 55%
2 PM 22° Mostly Clear 22% 10 mph NW 53%
3 PM 21° Mostly Clear 21% 10 mph NNW 53%
4 PM 21° Mostly Clear 21% 10 mph NNW 53%
5 PM 21° Clear 12% 11 mph NNW 52%
15-Day Forecast
Today
9/13
Mostly Cloudy
63%
17°
21°
Mon
9/14
Partly Cloudy
30%
14°
23°
Tue
9/15
Mostly Clear
3%
12°
21°
Wed
9/16
Partly Cloudy
15%
12°
21°
Thu
9/17
Mostly Clear
25%
17°
23°
Fri
9/18
Rain
78%
16°
21°
Sat
9/19
Drizzle
71%
15°
23°
Sun
9/20
Rain
72%
13°
19°
Mon
9/21
Drizzle
43%
12°
18°
Tue
9/22
Drizzle
60%
13°
19°
Wed
9/23
Drizzle
54%
14°
18°
Thu
9/24
Clear
60%
14°
19°
Fri
9/25
Drizzle
60%
14°
19°
Sat
9/26
Drizzle
60%
13°
19°
Sun
9/27
Drizzle
60%
13°
18°
31
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
20 AQI 3.7 µg/m³
O3
Ground-level ozone
Dominant
31 AQI 34 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 31 Good 31 20
Tue 31 Good 31 19
Wed 24 Good 24 12
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 Sun Sep 13, 20:00'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
SBCAPE11 J/kg
MLCAPE27 J/kg
MUCAPE11 J/kg
SBCIN-268 J/kg
MLCIN0 J/kg
Lifted Index1.5
Kinematics
0–6 km Shear31 kt
0–1 km Shear12 kt
Eff. Shear—
0–1 km SRH29
0–3 km SRH83
Eff. SRH—
Storm Motion302° @ 31 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index13.6
Thermo & Levels
PWAT1.05 in
0–3 km LR3.8 °C/km
700–500 LR5.9 °C/km
Total Totals37.9
LCL996 hPa
LFC641 hPa
EL611 hPa
Freezing Lvl13,045 ft