Weather in South Dennis

14-day forecast · updated today, Thursday, October 29, at 4:26 am (EDT)

Now · clear 43 °F

Feels like: 37 °F
Low / high: 39 / 63 °F
Rain: 1%
Wind: 7 mph SSW

→ 30.30 inHg · steady

Today in South Dennis: clear sky, 39 °F to 63 °F, with a 1% chance of rain and a light breeze from the south-southwest (7 mph). Tomorrow, mainly clear, 47 °F to 66 °F and a 18% chance of rain. The warmest day of the week is Friday 30, at 66 °F. Next likely rain: Thursday 5 (33%).

Measured now at the airport

Hyannis/Barnstable Muni (KHYA), 6.0 mi away · 30 min ago

Visibility9.9 mi or more

WeatherNothing to note

Temperature51 °F

Wind6 mph from the south-southwest

It's what the airport's weather station measured, not a forecast: on the coast, wind and fog can be different. Airports report every 30 or 60 minutes.

Airport METAR report, via NOAA's Aviation Weather Center (aviationweather.gov). Sources and licenses

Temperatures for the next 14 days

63° 39°
Today
66° 47°
Fri 30
52° 38°
Sat 31
56° 38°
Sun 1
62° 45°
Mon 2
59° 47°
Tue 3
60° 47°
Wed 4
61° 50°
Thu 5
60° 48°
Fri 6
57° 44°
Sat 7
55° 44°
Sun 8
58° 48°
Mon 9
59° 49°
Tue 10
57° 52°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 29	Clear sky	39 / 63 °F	1%	14 mph SW	1.6 ft	3:36 am · 3:47 pm	HRRR + NBM
Fri 30	Mainly clear	47 / 66 °F	18% · 0.01 in	10 mph W	1.8 ft	4:29 am · 4:41 pm	NBM
Sat 31	Mainly clear	38 / 52 °F	0%	12 mph NNW	2.3 ft	5:27 am · 5:39 pm	NBM
Sun 1	Clear sky	38 / 56 °F	1%	7 mph WSW	0.9 ft	5:29 am · 5:44 pm	NBM
Mon 2	Overcast	45 / 62 °F	5%	9 mph WSW	0.9 ft	6:35 am · 6:52 pm	NBM
Tue 3	Overcast	47 / 59 °F	7%	10 mph NE	1.4 ft	7:41 am · 8:00 pm	NBM
Wed 4	Overcast	47 / 60 °F	14% · 0.02 in	11 mph SE	1.9 ft	8:43 am · 9:06 pm	NBM
Thu 5	Clear sky	50 / 61 °F	33% · 0.43 in	11 mph SE	1.3 ft	9:41 am · 10:07 pm	NBM
Fri 6	Drizzle	48 / 60 °F	38% · 0.78 in	12 mph ESE	1.5 ft	10:32 am · 11:00 pm	NBM
Sat 7	Light rain	44 / 57 °F	31% · 0.33 in	11 mph N	2.1 ft	11:17 am · 11:48 pm	NBM
Sun 8	Overcast	44 / 55 °F	19% · 0.07 in	12 mph NW	1.2 ft	11:58 am	NBM + ECMWF
Mon 9	Overcast	48 / 58 °F	21%	11 mph WSW	0.9 ft	12:32 am · 12:37 pm	ECMWF
Tue 10	Light drizzle	49 / 59 °F	16% · 0.04 in	8 mph SSW	0.6 ft	1:13 am · 1:15 pm	ECMWF
Wed 11	Light drizzle	52 / 57 °F	20% · 0.06 in	12 mph N	1.9 ft	1:54 am · 1:55 pm	ECMWF

Each hour comes from the best model for this spot: HRRR until Thursday 29 11:00 pm; then NBM until Sunday 8 8:00 pm; then ECMWF until Thursday 12 10:00 pm; then GFS.

Each day comes from the best model covering this spot: regional ones first (HRRR and NBM in the U.S., AROME, ICON-EU), then ECMWF; day 16, NOAA GFS. Waves: Météo-France up to day 10, then ECMWF WAM, coarser and further offshore. High tides: our own tide calculation.

Today, every 3 hours

Time	12:00 am	3:00 am	6:00 am	9:00 am	12:00 pm	3:00 pm	6:00 pm	9:00 pm
Sky	Clear	Clear	Clear	Clear sky	Clear sky	Clear sky	Clear	Clear
Temperature	39°	43°	44°	56°	62°	63°	55°	55°
Chance of rain	0%	0%	0%	1%	1%	0%	0%	0%
Rain	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in
Wind (mph)	4 WSW	6 SSW	6 SSW	6 SW	12 SW	13 SW	8 SW	9 SW
Humidity	75%	73%	74%	79%	65%	63%	86%	88%
UV	0	0	0	1	3	1	0	0
Model	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR

Do the models agree?

Medium confidence

They broadly agree, but not quite on wind tomorrow: take it with some caution.

What 6 forecast models say for the next few days. The closer they are, the more reliable the forecast.

HighRainWind

Do the models agree? · High
High (°F)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	63°	66°	53°	54°	62°	57°	54°
AIFS	59°	64°	53°	51°	60°	62°	63°
GFS	60°	67°	51°	54°	59°	60°	56°
ICON	64°	69°	53°	53°	62°	64°	62°
HRRR	63°	65°	—	—	—	—	—
NBM	63°	66°	52°	56°	62°	59°	60°
Confidence	high	high	high	high	high	high	medium

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	0	0	0	0	0	0	0
AIFS	0	0	0	0	0	0	0
GFS	0	0.00 in	0	0	0	0	0
ICON	0	0.00 in	0	0	0	0	0
HRRR	0	0	—	—	—	—	—
NBM	0	0.01 in	0	0	0	0	0.01 in
Confidence	high	high	high	high	high	high	high

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	1426	2036	1934	921	1625	919	1019
AIFS	15	16	17	9	13	14	14
GFS	1632	2033	1727	1219	1628	1319	1318
ICON	1124	1022	1634	615	1125	411	818
HRRR	1424	1432	—	—	—	—	—
NBM	1120	1021	1223	713	916	1016	1119
Confidence	high	medium	high	high	high	high	high

Chance of rain from the ensemble models

Model	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF (51 scenarios)	0%	14%	0%	0%	2%	8%	16%
GFS (GEFS, 31 scenarios)	0%	7%	0%	0%	10%	20%	16%
NBM (NOAA)	1%	18%	0%	1%	5%	7%	14%
Thunderstorm (NBM)	0%	3%	0%	0%	1%	1%	1%

Each model's day runs midnight to midnight local time; models that reach fewer days are left blank. Rain: daily total. Wind: the day's highest average wind and, in small type, the strongest gust. Highlighted: values that stand out from the rest. The chance of rain comes from many runs of the same model with slightly different starting data.

Outlook

How the coming weeks and months compare with what is normal for the time of year. It is a trend, not a day-by-day forecast.

Next few weeks, compared with normal: a bit warmer, normal rain and a slightly warmer sea.

Next 6 weeks

When	TemperatureTemp.	Rain	Sea	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	Above +3.4 °F	Normal	Normal +0.4 °F	—
Nov 9 – Nov 15Nov 9–Nov 15	A bit above +1.3 °F	Normal	A bit above +0.9 °F	—
Nov 16 – Nov 22Nov 16–Nov 22	A bit above +1.6 °F	Normal	A bit above +0.9 °F	50° / 48°
Nov 23 – Nov 29Nov 23–Nov 29	A bit above +2.0 °F	A bit above +30%	A bit above +1.1 °F	49° / 46°
Nov 30 – Dec 6Nov 30–Dec 6	A bit above +1.8 °F	Normal	A bit above +1.1 °F	47° / 44°

Coming months

When	TemperatureTemp.	Rain	Sea
November	A bit above +1.4 °F	Normal	A bit above +1.3 °F
December	Above +2.9 °F	Normal	Above +2.0 °F
January	Above +3.8 °F	A bit above +29%	Above +2.3 °F
February	Above +3.2 °F	Normal	Above +2.3 °F
March	Above +2.9 °F	Normal	Above +2.3 °F

Weeks: ECMWF 46-day (average of its scenarios), against the normal of the last 20 years for those dates. Months: ECMWF SEAS5. Rain: total against normal. The further ahead, the closer it gets to normal and the less detail it can give.

South Dennis climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit South Dennis is from June to September: highs of 71 °F to 79 °F, about 9 rainy days a month and 7 hours of sunshine a day.

Hurricane season: from July to August, peaking in July. In the last 30 years (1996–2025), 8 tropical cyclones passed within 93 mi of South Dennis, about 3 every 10 years; one of them with hurricane-force winds (74 mph or more). The most recent: Henri, in August 2021.

38° 24°

JanJ
40° 25°

FebF
45° 31°

MarM
54° 40°

AprA
63° 49°

MayM
72° 58°

JunJ
79° 64°

JulJ
78° 64°

AugA
71° 57°

SepS
62° 47°

OctO
52° 38°

NovN
44° 30°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves	Cyclones
JanuaryJan	38°	24°	3.84 in	9	3.2	40°	4.5 ft	–
FebruaryFeb	40°	25°	3.52 in	8	4.7	38°	4.3 ft	–
MarchMar	45°	31°	4.17 in	9	5.1	38°	4.3 ft	–
AprilApr	54°	40°	4.07 in	9	5.9	43°	3.8 ft	–
MayMay	63°	49°	3.78 in	9	6.7	50°	3.1 ft	–
JuneJun	72°	58°	3.53 in	9	7.1	59°	2.6 ft	–
JulyJul	79°	64°	2.75 in	9	7.8	66°	2.4 ft	5
AugustAug	78°	64°	3.28 in	9	7.2	68°	2.4 ft	3
SeptemberSep	71°	57°	3.91 in	8	6.0	65°	3.1 ft	–
OctoberOct	62°	47°	4.54 in	9	4.6	58°	3.8 ft	–
NovemberNov	52°	38°	4.55 in	8	3.3	51°	4.2 ft	–
DecemberDec	44°	30°	4.70 in	10	2.9	45°	4.2 ft	–

Month	Water	Waves	Cyclones
Jan	40°	4.5 ft	–
Feb	38°	4.3 ft	–
Mar	38°	4.3 ft	–
Apr	43°	3.8 ft	–
May	50°	3.1 ft	–
Jun	59°	2.6 ft	–
Jul	66°	2.4 ft	5
Aug	68°	2.4 ft	3
Sep	65°	3.1 ft	–
Oct	58°	3.8 ft	–
Nov	51°	4.2 ft	–
Dec	45°	4.2 ft	–

Days: rainy days in the month. Sun: hours a day.

A normal year brings 46.62 in of rain on about 105 days and about 1,950 hours of sunshine.

Cyclones: how many tropical cyclones (tropical storms, hurricanes and typhoons) passed within 93 mi in each month from 1996 to 2025, according to IBTrACS (NOAA).

1991–2020 averages. Highs, lows and rainfall: TerraClimate; rainy days (0.04 in or more): NASA POWER (MERRA-2); sunshine hours: estimated from solar radiation; water: NOAA OISST; waves (average height): ERA5, 2011–2020. Normals are not a forecast: any given year can turn out very different. Sources and licenses

Temperature

Now43 °Ffeels like 37 °F

Tomorrow47 / 66 °F

It's 43 °F now (feels like 37 °F). Today, 39 °F to 63 °F; tomorrow, 47 °F to 66 °F.

Chance of rain

Today 1%
Fri 30 18% 0.01 in
Sat 31 0%
Sun 1 1%
Mon 2 5%
Tue 3 7%
Wed 4 14% 0.02 in

Today the chance of rain reaches 1%. The next day with likely rain is Thursday 5: 33% and 0.43 in.

Recent rain: last 24 hours, 0.00 in; last 3 days, 0.00 in; last 7 days, 0.00 in.

Humidity and dew point

Humidity74%

Dew point35 °F

Humidity is 74% now and the dew point is 35 °F.

The dew point is the temperature at which the air becomes saturated: the higher it is, the heavier the air feels.

Visibility and fog

Now9.8 migood

Clouds0%

Visibility is good now (9.8 mi). No fog expected today.

UV index

Now0

Today's peak3moderate

Fri 30: 3 · Sat 31: 3 · Sun 1: 3

Index	Level	What to do
0–2	low	No special protection needed.
3–5	moderate	Hat, sunglasses and sunscreen around midday.
6–7	high	Sunscreen, hat and shade between 12 and 4 pm.
8–10	very high	Avoid the midday sun; reflection off the water adds to it.
11+	extreme	Avoid the sun between 11 am and 5 pm; protect yourself even if it is cloudy.

Reflection off water and sand adds radiation: protect yourself more on a boat or at the beach.

Barometric pressure

↗ Rising Anglers say fish bite less for a while
→ Steady · now Anglers expect normal activity
↘ Falling Anglers say fish feed more before the change

30.0030.2030.40 29.93

Steady now (−0.02 inHg in 3 hours). Over the next 48 hours: −0.09 inHg. Steady pressure: anglers expect normal activity. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityGood · 37

Saharan dustNo

Previous days

The weather over the last 30 days, as the models analyzed it. Tap a day to see it hour by hour.

Day	Sky	Low / high	Rain	Max wind
Wed 28	Overcast	42 / 56 °F	0	8 mph SW
Tue 27	Partly cloudy	46 / 59 °F	0	15 mph NNE
Mon 26	Mainly clear	45 / 63 °F	0	16 mph WSW
Sun 25	Partly cloudy	44 / 60 °F	0	8 mph SSW
Sat 24	Clear sky	45 / 55 °F	0	9 mph NNW
Fri 23	Clear sky	49 / 55 °F	0	24 mph NNE
Thu 22	Drizzle	53 / 57 °F	0.07 in	25 mph N

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Overcast	54 / 56 °F	0	24 mph NE
Tue 20	Overcast	52 / 58 °F	0	20 mph NNE
Mon 19	Overcast	45 / 56 °F	0	14 mph NE
Sun 18	Clear sky	46 / 52 °F	0	16 mph NNE
Sat 17	Drizzle	48 / 64 °F	0.24 in	22 mph NNW
Fri 16	Heavy drizzle	50 / 66 °F	0.33 in	19 mph SSW
Thu 15	Mainly clear	50 / 62 °F	0	20 mph N
Wed 14	Light drizzle	62 / 76 °F	0.01 in	16 mph WSW
Tue 13	Light rain	57 / 63 °F	0.22 in	14 mph ESE
Mon 12	Light rain	58 / 63 °F	0.22 in	18 mph NNE
Sun 11	Rain	51 / 59 °F	0.78 in	17 mph ESE
Sat 10	Overcast	53 / 59 °F	0	11 mph NNW
Fri 9	Overcast	54 / 67 °F	0	14 mph W
Thu 8	Light drizzle	59 / 70 °F	0.02 in	19 mph SW
Wed 7	Mainly clear	49 / 62 °F	0	11 mph SW
Tue 6	Clear sky	50 / 61 °F	0	15 mph WNW
Mon 5	Light drizzle	56 / 69 °F	0.04 in	18 mph WNW
Sun 4	Drizzle	56 / 63 °F	0.11 in	13 mph ENE
Sat 3	Light drizzle	57 / 64 °F	0.02 in	13 mph NNE
Fri 2	Drizzle	64 / 76 °F	0.12 in	15 mph SW
Thu 1	Overcast	58 / 72 °F	0	15 mph SW
Wed 30	Overcast	60 / 65 °F	0	7 mph NW
Tue 29	Light drizzle	58 / 62 °F	0.02 in	11 mph NW

These are the models at the start of each day (ECMWF and GFS; waves from Météo-France), not readings from a weather station: there can be differences at specific spots.

Questions about the weather in South DennisQuestions

What's the weather like today in South Dennis?

Clear sky, from 39 °F to 63 °F, with a light breeze from the south-southwest (7 mph) and a 1% chance of rain.

Will it rain tomorrow in South Dennis?

On Friday 30 the chance of rain is 18% (0.01 in): mainly clear.

How warm will it be this week?

Between a low of 38 °F and a high of 66 °F; the warmest day, Friday 30.

What's the UV index today?

It reaches 3 (moderate). Hat, sunglasses and sunscreen around midday.

Is the pressure rising or falling?

It's 30.30 inHg and steady: −0.14 inHg over the last 24 hours.

When is the best time to visit South Dennis?

The best time to visit South Dennis is from June to September: highs of 71 °F to 79 °F, about 9 rainy days a month and 7 hours of sunshine a day.

What is the weather like in South Dennis in October?

In October, South Dennis normally sees highs of 62 °F and lows of 47 °F, with about 9 rainy days (4.54 in for the month) and 5 hours of sunshine a day. The sea is around 58 °F. These are 1991–2020 averages.

What are the warmest and wettest months in South Dennis?

The warmest is July, with average highs of 79 °F, and the coldest January, with lows of 24 °F. The wettest is December (4.70 in) and the driest, July.

When is hurricane season in South Dennis?

Hurricane season: from July to August, peaking in July. In the last 30 years (1996–2025), 8 tropical cyclones passed within 93 mi of South Dennis, about 3 every 10 years; one of them with hurricane-force winds (74 mph or more). The most recent: Henri, in August 2021.

More about South Dennis today

Weather near South Dennis

Only places with a different forecast: spots a few miles apart share the same model cell and wouldn't add anything.

Learn more

Weather: Open-Meteo, CC BY 4.0, with the best model for each spot and lead time (NOAA HRRR and NBM in the U.S., Météo-France AROME, DWD ICON-EU, ECMWF IFS and NOAA GFS); ECMWF grid point 6.4 mi away. The comparison also uses ICON (DWD), AIFS (ECMWF) and ARPEGE (Météo-France). Outlook: ECMWF 46-day and SEAS5. Chance of rain from ensemble models (ECMWF, GEFS and NBM). UV, air quality and pollen: CAMS (Copernicus).

Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 4:26 am (local time).

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