Dartmouth, Massachusetts

Last updated: 11:00 AM CDT · Refresh

24°C

Feels like 22°

Mostly Cloudy

▲ 24° / ▼ 18°

Wind

13 mph SSE

Humidity

62%

Dew Point

17°

Pressure

29.85 inHg

Visibility

10 mi

UV Index

5.9

Cloud Cover

79%

Sunrise

5:27 AM

Sunset

8:12 PM

Drag to pan · double-click to forecast a point

WeatherAI™ Analysis

WeatherAI Analysis: Dartmouth is currently mostly cloudy at 24°C. Precipitation is likely — peak probability 90% around 5 PM. Atmospheric instability is elevated (CAPE up to 903 J/kg) — isolated convective development possible. Sunrise: 5:27AM · Sunset: 8:12PM.

64 AQI · Moderate Dominant: PM2.5 Air Quality

Hourly Forecast · Next 24 Hours

Now

24°

19%

1 PM

23°

37%

2 PM

24°

41%

3 PM

23°

51%

4 PM

22°

79%

5 PM

23°

90%

6 PM

23°

90%

7 PM

23°

90%

8 PM

23°

90%

9 PM

22°

90%

10 PM

22°

85%

11 PM

22°

77%

12 AM

22°

80%

1 AM

22°

76%

2 AM

22°

73%

3 AM

22°

57%

4 AM

22°

62%

5 AM

21°

59%

6 AM

21°

60%

7 AM

21°

52%

8 AM

22°

47%

9 AM

23°

53%

10 AM

24°

58%

11 AM

25°

65%

7-Day Forecast

Today

24° 18°

Overcast with a 90% chance of rain.

Wed

27° 18°

Mostly Cloudy with a 80% chance of rain.

Thu

26° 15°

Mostly Cloudy with a 45% chance of rain.

Fri

24° 13°

Fog with a 40% chance of rain.

Sat

23° 14°

Drizzle, 37% chance.

Sun

25° 14°

Drizzle, 37% chance.

Mon

26° 16°

Drizzle, 53% chance.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 24° Mostly Cloudy 19% 13 mph SSE 62%

1 PM 23° Overcast 37% 14 mph SSE 60%

2 PM 24° Overcast 41% 14 mph SSE 62%

3 PM 23° Overcast 51% 15 mph SSE 70%

4 PM 22° Rain 79% 15 mph SSE 80%

5 PM 23° Overcast 90% 16 mph SSE 91%

6 PM 23° Overcast 90% 15 mph SSE 94%

7 PM 23° Heavy Rain 90% 14 mph SSE 96%

8 PM 23° Overcast 90% 15 mph S 98%

9 PM 22° Heavy Rain 90% 14 mph S 98%

10 PM 22° Overcast 85% 15 mph S 96%

11 PM 22° Thunderstorm 77% 14 mph SSW 95%

12 AM 22° Heavy Rain 80% 15 mph SSW 96%

1 AM 22° Overcast 76% 13 mph SSW 95%

2 AM 22° Overcast 73% 12 mph SSW 96%

3 AM 22° Overcast 57% 12 mph SSW 96%

4 AM 22° Overcast 62% 13 mph SSW 96%

5 AM 21° Overcast 59% 13 mph SSW 96%

6 AM 21° Overcast 60% 13 mph SSW 95%

7 AM 21° Overcast 52% 13 mph SSW 93%

8 AM 22° Overcast 47% 13 mph SSW 92%

9 AM 23° Overcast 53% 13 mph SSW 88%

10 AM 24° Mostly Cloudy 58% 13 mph SSW 85%

11 AM 25° Rain 65% 14 mph SSW 81%

15-Day Forecast

Today

7/21

Overcast

90%

18°

24°

Wed

7/22

Mostly Cloudy

80%

18°

27°

Thu

7/23

Mostly Cloudy

45%

15°

26°

Fri

7/24

Fog

40%

13°

24°

Sat

7/25

Drizzle

37%

14°

23°

Sun

7/26

Drizzle

37%

14°

25°

Mon

7/27

Drizzle

53%

16°

26°

Tue

7/28

Rain

69%

18°

26°

Wed

7/29

Rain

68%

18°

27°

Thu

7/30

Drizzle

44%

17°

27°

Fri

7/31

Clear

25%

16°

23°

Sat

8/1

Drizzle

60%

19°

23°

Sun

8/2

Drizzle

60%

19°

23°

Mon

8/3

Drizzle

60%

19°

24°

Tue

8/4

Drizzle

60%

19°

24°

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

PM_2.5

Fine particulate matter

Dominant

64 AQI 16.3 µg/m³

O₃

Ground-level ozone

42 AQI 45 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Wed 64 Moderate 42 64

Thu 54 Moderate 54 31

Fri 38 Good 38 16

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. PM_2.5 (fine particles) is reported in µg/m³ and ozone (O₃) in ppb. Forecast source: NWS NAQFC.

Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio

RAP

Valid Tue Jul 21, 14:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE15 J/kg

MLCAPE10 J/kg

MUCAPE15 J/kg

SBCIN0 J/kg

MLCIN0 J/kg

Lifted Index2.4

Kinematics

0–6 km Shear36 kt

0–1 km Shear11 kt

Eff. Shear—

0–1 km SRH-6

0–3 km SRH-58

Eff. SRH—

Storm Motion188° @ 32 kt

0–1 km EHI-0.0

Composite Parameters

Sig. Tornado0.0

STP (eff)—

Supercell—

K-Index1.1

Thermo & Levels

PWAT0.91 in

0–3 km LR5.4 °C/km

700–500 LR5.8 °C/km

Total Totals38.4

LCL908 hPa

LFC1011 hPa

EL948 hPa

Freezing Lvl15,043 ft

Dartmouth, Massachusetts

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