Observed 9:35 PM EDT at KHYA

South Dennis, MA weather

Clear and 36°2°.

Forecasts agree

Now 36°2°

Clear

Wind: Calm; Light through 10 AM
Dew point: 34°1°; Dry, static shocks likely
Humidity: 93%; Air 36°2°, dew point 34°1° · frost likely
UV tomorrow: 4Moderate; Moderate 11 AM–4 PM · peak 4
Air quality: 28Good; Main pollutant: Ozone
Pressure: 30.52 inHg1034 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

About the same as this time yesterday (39°4° then, 38°3° now)

Good hours for

Low 37°3° tomorrow at 6 AM
Above 50°10° tomorrow by 9 AM
High 61°16° tomorrow at 1 PM
Below 50°10° tomorrow night after 7 PM

TonightDown to 38°3° by 5 AM · Clear
Tomorrow morningUp to 56°13° by 11 AM · Clear
Tomorrow afternoonNear 58°14° · Clear
Tomorrow nightDown to 43°6° by 10 PM · Clear
Monday morningUp to 58°14° by 11 AM · Clear
Monday afternoonNear 61°16° · Clear
Monday nightDown to 54°12° by 9 PM · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 10p	Clear	44°7° (likely 41°5° to 47°8°)	44°7°	0%	1 mph2 km/h from W, gusts 5 mph9 km/h	79%	0%	0
Sat 11p	Clear	43°6° (likely 40°4° to 46°8°)	43°6°	0%	1 mph2 km/h from W, gusts 6 mph10 km/h	82%	0%	0
Sun 12a	Clear	42°6° (likely 39°4° to 46°8°)	42°6°	0%	2 mph3 km/h from W, gusts 6 mph9 km/h	86%	2%	0
Sun 1a	Clear	41°5° (likely 39°4° to 45°7°)	41°5°	0%	1 mph2 km/h from W, gusts 5 mph9 km/h	86%	0%	0
Sun 2a	Clear	40°4° (likely 39°4° to 45°7°)	40°4°	0%	1 mph2 km/h from W, gusts 5 mph9 km/h	85%	0%	0
Sun 3a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	85%	0%	0
Sun 4a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	85%	1%	0
Sun 5a	Clear	38°3° (likely 38°3° to 45°7°)	38°3°	0%	2 mph3 km/h from W, gusts 5 mph9 km/h	85%	6%	0
Sun 6a	Clear	37°3° (likely 37°3° to 44°7°)	37°3°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	85%	5%	0
Sun 7a	Sunny	38°3° (likely 38°3° to 44°7°)	38°3°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	85%	7%	0
Sun 8a	Sunny	43°6° (likely 39°4° to 46°8°)	43°6°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	79%	8%	0
Sun 9a	Sunny	50°10° (likely 45°7° to 50°10°)	50°10°	0%	1 mph2 km/h from W, gusts 3 mph4 km/h	66%	6%	1
Sun 10a	Sunny	53°12° (likely 53°12° to 54°12°)	53°12°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	61%	3%	2
Sun 11a	Sunny	56°13° (likely 56°13° to 59°15°)	56°13°	0%	2 mph3 km/h from SW, gusts 5 mph8 km/h	59%	0%	3
Sun 12p	Sunny	59°15° (likely 58°14° to 61°16°)	59°15°	0%	3 mph5 km/h from SW, gusts 6 mph10 km/h	53%	0%	4
Sun 1p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	3 mph5 km/h from SW, gusts 7 mph12 km/h	50%	0%	4
Sun 2p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	5 mph8 km/h from S, gusts 9 mph14 km/h	50%	0%	4
Sun 3p	Sunny	60°16° (likely 58°14° to 61°16°)	60°16°	0%	6 mph10 km/h from S, gusts 9 mph15 km/h	51%	3%	3
Sun 4p	Sunny	58°14° (likely 56°13° to 59°15°)	58°14°	0%	7 mph11 km/h from S, gusts 9 mph15 km/h	57%	2%	2
Sun 5p	Sunny	56°13° (likely 53°12° to 57°14°)	56°13°	0%	7 mph11 km/h from S, gusts 11 mph17 km/h	62%	2%	1
Sun 6p	Clear	52°11° (likely 50°10° to 52°11°)	52°11°	0%	6 mph10 km/h from S, gusts 11 mph17 km/h	71%	5%	0
Sun 7p	Clear	49°9° (likely 48°9° to 50°10°)	47°8°	0%	5 mph8 km/h from S, gusts 12 mph19 km/h	83%	9%	0
Sun 8p	Clear	46°8° (likely 46°8° to 50°10°)	45°7°	0%	3 mph5 km/h from S, gusts 12 mph19 km/h	93%	13%	0
Sun 9p	Clear	45°7° (likely 45°7° to 50°10°)	44°7°	0%	3 mph5 km/h from SW, gusts 12 mph19 km/h	96%	12%	0
Sun 10p	Clear	43°6° (likely 43°6° to 50°10°)	41°5°	0%	3 mph5 km/h from SW, gusts 12 mph20 km/h	100%	9%	0
Sun 11p	Clear	44°7° (likely 44°7° to 49°9°)	42°6°	0%	3 mph5 km/h from SW, gusts 12 mph19 km/h	100%	7%	0
Mon 12a	Clear	44°7° (likely 44°7° to 49°9°)	42°6°	0%	3 mph5 km/h from SW, gusts 12 mph19 km/h	100%	6%	0
Mon 1a	Clear	44°7° (likely 44°7° to 49°9°)	42°6°	0%	3 mph5 km/h from SW, gusts 12 mph20 km/h	100%	6%	0
Mon 2a	Clear	44°7° (likely 43°6° to 49°9°)	42°6°	0%	3 mph5 km/h from SW, gusts 12 mph19 km/h	100%	6%	0
Mon 3a	Clear	44°7° (likely 43°6° to 49°9°)	41°5°	0%	5 mph8 km/h from SW, gusts 13 mph20 km/h	96%	4%	0
Mon 4a	Clear	44°7° (likely 43°6° to 49°9°)	41°5°	0%	5 mph8 km/h from SW, gusts 13 mph21 km/h	100%	3%	0
Mon 5a	Clear	44°7° (likely 42°6° to 48°9°)	41°5°	0%	5 mph8 km/h from SW, gusts 13 mph21 km/h	100%	2%	0
Mon 6a	Clear	45°7° (likely 41°5° to 48°9°)	43°6°	0%	5 mph8 km/h from SW, gusts 13 mph22 km/h	100%	1%	0
Mon 7a	Sunny	45°7° (likely 41°5° to 48°9°)	42°6°	0%	6 mph10 km/h from SW, gusts 13 mph21 km/h	100%	1%	0
Mon 8a	Sunny	48°9° (likely 42°6° to 49°9°)	45°7°	0%	6 mph10 km/h from SW, gusts 13 mph21 km/h	96%	0%	0
Mon 9a	Sunny	52°11° (likely 51°11° to 53°12°)	52°11°	0%	7 mph11 km/h from SW, gusts 15 mph24 km/h	83%	1%	1
Mon 10a	Sunny	56°13° (likely 55°13° to 57°14°)	56°13°	0%	8 mph13 km/h from W, gusts 16 mph26 km/h	77%	1%	2
Mon 11a	Sunny	58°14° (likely 58°14° to 60°16°)	58°14°	0%	8 mph13 km/h from W, gusts 16 mph26 km/h	72%	0%	3
Mon 12p	Sunny	60°16° (likely 60°16° to 62°17°)	60°16°	0%	8 mph13 km/h from W, gusts 16 mph26 km/h	67%	3%	4
Mon 1p	Sunny	61°16° (likely 61°16° to 64°18°)	61°16°	0%	8 mph13 km/h from W, gusts 15 mph24 km/h	67%	15%	4
Mon 2p	Sunny	61°16° (likely 61°16° to 65°18°)	61°16°	0%	8 mph13 km/h from W, gusts 14 mph23 km/h	67%	2%	4
Mon 3p	Sunny	62°17° (likely 61°16° to 66°19°)	62°17°	0%	7 mph11 km/h from W, gusts 13 mph21 km/h	65%	14%	3
Mon 4p	Sunny	62°17° (likely 60°16° to 64°18°)	62°17°	0%	7 mph11 km/h from SW, gusts 13 mph21 km/h	67%	3%	2
Mon 5p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	6 mph10 km/h from SW, gusts 13 mph21 km/h	70%	4%	1
Mon 6p	Clear	60°16° (likely 55°13° to 60°16°)	60°16°	0%	5 mph8 km/h from W, gusts 11 mph17 km/h	69%	5%	0
Mon 7p	Clear	58°14° (likely 53°12° to 58°14°)	58°14°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	75%	11%	0
Mon 8p	Clear	56°13° (likely 53°12° to 56°13°)	56°13°	0%	5 mph8 km/h from W, gusts 13 mph21 km/h	77%	14%	0
Mon 9p	Clear	54°12° (likely 54°12° to 57°14°)	54°12°	0%	5 mph8 km/h from W, gusts 14 mph22 km/h	83%	19%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Sunny. High 56°13°, low 35°2°. Typical 59°15° / 43°6°. Dry. Forecasts agree.
1. Evening
  6 PM–midnight
  Clear, 43°6°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Tonight: Patchy frost after 2am. Clear, with a low around 35. West wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
55°13°–57°14°
Low, likely
35°2°–45°7°
Typical high / low
59°15° / 43°6°
Wind
8 mph14 km/h, gusts 16 mph26 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 61°16°, low 42°6°. Typical 58°14° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 46°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 44°7°
  Dry
Official NWS forecast
Day: Patchy frost before 8am. Sunny, with a high near 61. Southwest wind 1 to 7 mph.
Night: Clear, with a low around 42. Southwest wind around 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–61°16°
Low, likely
38°3°–44°7°
Typical high / low
58°14° / 43°6°
Wind
8 mph13 km/h, gusts 16 mph26 km/h
UV peak
4
Monday, Oct 26. Sunny. High 62°17°, low 42°6°. Typical 58°14° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 53°12°
  Dry
Official NWS forecast
Day: Sunny, with a high near 62. Southwest wind 5 to 8 mph.
Night: Mostly clear, with a low around 42. Northwest wind 5 to 10 mph, with gusts as high as 22 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
42°6°–48°9°
Typical high / low
58°14° / 43°6°
Wind
13 mph21 km/h, gusts 21 mph33 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 51°11°, low 38°3°. Typical 58°14° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 51°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 49°10°
  Dry
3. Evening
  6 PM–midnight
  Clear, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 44°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 51. North wind 8 to 13 mph.
Night: Mostly clear, with a low around 38. Northeast wind 2 to 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
51°11°–58°14°
Low, likely
38°3°–45°7°
Typical high / low
58°14° / 42°6°
Wind
21 mph34 km/h, gusts 33 mph53 km/h
UV peak
4
Wednesday, Oct 28. Mostly sunny. High 51°11°, low 41°5°. Typical 58°14° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 52°11°
  Dry
3. Evening
  6 PM–midnight
  Clear, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 51. East wind around 5 mph.
Night: Mostly clear, with a low around 41. South wind around 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
51°11°–53°12°
Low, likely
41°5°–45°7°
Typical high / low
58°14° / 42°6°
Wind
10 mph17 km/h
UV peak
4
Thursday, Oct 29. Mostly sunny. High 59°15°, low 50°10°. Typical 57°14° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 59°15°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 56°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 59. Southwest wind 3 to 12 mph.
Night: Mostly clear, with a low around 50. Southwest wind around 9 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
57°14°–61°16°
Low, likely
45°7°–50°10°
Typical high / low
57°14° / 42°6°
Wind
20 mph32 km/h, gusts 28 mph45 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 62°17°, low 47°8°. Typical 57°14° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 54°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 62. West wind around 8 mph.
Night: Mostly clear, with a low around 47. Northwest wind around 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–65°18°
Low, likely
47°8°–55°13°
Typical high / low
57°14° / 42°6°
Wind
17 mph28 km/h, gusts 27 mph44 km/h
UV peak
3
Saturday, Oct 31. Partly sunny. High 58°14°, low 51°11°. Typical 57°14° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 58°15°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 51°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 58. North wind 5 to 8 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
54°12°–60°16°
Low, likely
48°9°–55°13°
Typical high / low
57°14° / 41°5°
Wind
14 mph22 km/h, gusts 25 mph41 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 59°15°, low 51°11°. Typical 56°13° / 41°5°. Rain, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 53°11°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 58°15°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  20% chance
4. Overnight
  midnight–6 AM
  Drizzle, 58°15°
  40% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
55°13°–62°17°
Low, likely
48°9°–55°13°
Typical high / low
56°13° / 41°5°
Wind
17 mph27 km/h, gusts 26 mph42 km/h
UV peak
4
Monday, Nov 2. Drizzle. High 61°16°, low 57°14°. Typical 56°13° / 41°5°. Rain 0.18 in4.6 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Rain, 59°15°
  40% chance · 0.08 in1.9 mm
2. Afternoon
  noon–6 PM
  Rain, 61°16°
  30% chance · 0.13 in3.4 mm
3. Evening
  6 PM–midnight
  Cloudy, 59°15°
  30% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
57°14°–65°18°
Low, likely
55°13°–61°16°
Typical high / low
56°13° / 41°5°
Wind
25 mph40 km/h, gusts 40 mph64 km/h

10 days15 days30 days

The outlook

Today
Dry, high 56°, low 35°.
Tomorrow
Dry, high 61°, low 42°, warming up.
Monday
Dry, high 62°, low 42°.
Rest of week
Mostly dry, highs 51–62°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (BOX) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Atlantic Coast at Dennis Sesuit Harbor (IN MLLW)

3.3 mi

Below flood stage

Level: 6.4 ft

Forecast peak 12.0 ft Tue 12 PM, action stage

Reading from Sat 8 PM · NWS gauge page

Atlantic Coast at Chatham Harbor (IN MLLW)

10 mi

Below flood stage

Level: 2.8 ft

Forecast peak 6.9 ft Tue 1 PM

Reading from Sat 8:30 PM · NWS gauge page

Atlantic Coast at Provincetown Harbor (IN MLLW)

24 mi

Below flood stage

Level: 7.0 ft

Forecast peak 11.4 ft Tue 12 PM

Reading from Sat 8:30 PM · NWS gauge page

Herring River at North Harwich

2.2 mi

Level: 1.7 ft
Flow: 3 cfs

Reading from Sat 7:45 PM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 72% less heating than a typical week.

This week 29Typical 104

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 22
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 8 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 34°F).

Open the windows?

Sun, 1:00 PM–3:00 PM

Good stretch to open the windows.

Is this typical?

HYANNIS · official normals 1991–2020 · records 1893–2026

Oct 24, today vs a typical year

Today’s expected high is 3°2° colder than typical.

Last 7 days vs normal

On average 1°0° colder than normal (daily mean temperature).

−8°−4°MonOct 19
−4°−2°TueOct 20
+4°+2°WedOct 21
+4°+2°ThuOct 22
+2°+1°FriOct 23
—SatOct 24
—SunOct 25

South Dennis weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 43 min; Losing 2 min 35 s a day; shortest Dec 21, 1 h 34 min less
Golden hour: 5:07–6:03 PM; Morning 6:45–7:41 AM
Blue hour: 6:03–6:14 PM; Morning 6:34–6:45 AM; first light 6:34 AM

Stars tonight? Fair

Clear 10:07 PM–6:35 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:12 AM · rises 4:42 PM
Full moon: Oct 26
New moon: Nov 9

Looking south from South Dennis. The highest point on the skyline is about 1,700 ft, 32 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

South Dennis, MA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Atlantic Coast at Dennis Sesuit Harbor (IN MLLW)

Atlantic Coast at Chatham Harbor (IN MLLW)

Atlantic Coast at Provincetown Harbor (IN MLLW)

Herring River at North Harwich

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon