Weather in Portsmouth

14-day forecast · updated today, Thursday, October 29, at 11:59 pm (EDT)

Now · partly cloudy 61 °F

Feels like: 62 °F
Low / high: 58 / 74 °F
Rain: 2%
Wind: 4 mph NE

↘ 30.28 inHg · falling

Today in Portsmouth: overcast, 58 °F to 74 °F, with a 2% chance of rain and a light breeze from the northeast (4 mph). Tomorrow, clear sky, 54 °F to 75 °F and a 1% chance of rain. The warmest day of the week is Friday 30, at 75 °F. Next likely rain: Wednesday 4 (20%).

Measured now at the airport

Norfolk NAS (KNGU), 7.1 mi away · 1 h 2 min ago

Visibility9.9 mi or more

WeatherNothing to note

Temperature61 °F

Wind7 mph from the east

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

74° 58°
Today
75° 54°
Fri 30
62° 55°
Sat 31
66° 54°
Sun 1
69° 56°
Mon 2
71° 58°
Tue 3
72° 61°
Wed 4
72° 62°
Thu 5
68° 58°
Fri 6
64° 55°
Sat 7
63° 53°
Sun 8
60° 51°
Mon 9
64° 50°
Tue 10
65° 56°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 29	Overcast	58 / 74 °F	2%	5 mph NE	0.5 ft	12:18 pm	HRRR + NBM
Fri 30	Clear sky	54 / 75 °F	1%	6 mph NW	0.3 ft	12:43 am · 1:13 pm	NBM
Sat 31	Overcast	55 / 62 °F	0%	11 mph NNE	0.9 ft	1:40 am · 2:10 pm	NBM
Sun 1	Overcast	54 / 66 °F	1%	7 mph ENE	0.3 ft	1:40 am · 2:11 pm	NBM
Mon 2	Overcast	56 / 69 °F	9%	7 mph E	0.1 ft	2:43 am · 3:15 pm	NBM
Tue 3	Partly cloudy	58 / 71 °F	8%	11 mph ENE	0.1 ft	3:53 am · 4:24 pm	NBM
Wed 4	Overcast	61 / 72 °F	20% · 0.20 in	13 mph ENE	0.3 ft	5:02 am · 5:27 pm	NBM
Thu 5	Overcast	62 / 72 °F	28% · 0.13 in	12 mph E	0.5 ft	5:59 am · 6:19 pm	NBM
Fri 6	Rain	58 / 68 °F	27% · 0.58 in	10 mph WSW	2.1 ft	6:45 am · 7:04 pm	NBM
Sat 7	Drizzle	55 / 64 °F	18% · 0.01 in	10 mph NNW	2.6 ft	7:27 am · 7:46 pm	NBM
Sun 8	Overcast	53 / 63 °F	11% · 0.07 in	10 mph NNW	2.4 ft	8:07 am · 8:27 pm	NBM + ECMWF
Mon 9	Partly cloudy	51 / 60 °F	16%	11 mph NNE	2.6 ft	8:46 am · 9:08 pm	ECMWF
Tue 10	Overcast	50 / 64 °F	16%	7 mph NNE	1.9 ft	9:25 am · 9:49 pm	ECMWF
Wed 11	Overcast	56 / 65 °F	14%	5 mph N	1.2 ft	10:04 am · 10:29 pm	ECMWF

Each hour comes from the best model for this spot: HRRR until Thursday 29 6:00 pm; then NBM until Sunday 8 8:00 pm; then ECMWF until Thursday 12 10:00 am; 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	Overcast	Mainly clear	Mainly clear	Clear sky	Mainly clear	Mainly clear	Clear sky	Clear
Temperature	61°	61°	60°	63°	72°	74°	66°	60°
Chance of rain	0%	1%	1%	1%	1%	2%	1%	1%
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 NE	2 N	4 ENE	2 NNE	4 NNW	4 N	4 ENE	2 SE
Humidity	90%	91%	92%	91%	62%	54%	74%	93%
UV	0	0	0	1	4	2	0	0
Model	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR	NBM	NBM

Do the models agree?

High confidence

The models agree for the next few days: the forecast is fairly solid.

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	72°	75°	61°	64°	69°	73°	74°
AIFS	72°	77°	62°	64°	68°	71°	74°
GFS	73°	79°	64°	69°	71°	71°	76°
ICON	68°	74°	62°	68°	71°	65°	70°
HRRR	74°	78°	—	—	—	—	—
NBM	70°	75°	62°	66°	69°	71°	72°
Confidence	high	high	high	high	high	high	high

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	0	0	0	0	0
ICON	0	0	0	0	0	0.30 in	0.02 in
HRRR	0	0	—	—	—	—	—
NBM	0	0	0	0	0	0	0.19 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	614	615	921	725	617	720	616
AIFS	6	8	11	8	6	7	7
GFS	69	1225	1124	913	812	915	1226
ICON	511	613	1021	614	613	918	919
HRRR	612	1117	—	—	—	—	—
NBM	58	610	1116	710	710	1116	1319
Confidence	high	high	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)	2%	0%	0%	0%	4%	4%	16%
GFS (GEFS, 31 scenarios)	0%	0%	0%	0%	24%	23%	42%
NBM (NOAA)	2%	1%	0%	1%	9%	8%	20%
Thunderstorm (NBM)	0%	0%	0%	0%	1%	1%	2%

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: warmer and a bit wetter.

Next 6 weeks

When	TemperatureTemp.	Rain	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	Well above +7.0 °F	Above +65%	—
Nov 9 – Nov 15Nov 9–Nov 15	Normal +0.2 °F	Normal	61° / 47°
Nov 16 – Nov 22Nov 16–Nov 22	A bit above +2.2 °F	Normal	61° / 48°
Nov 23 – Nov 29Nov 23–Nov 29	A bit above +2.2 °F	A bit above +35%	58° / 47°
Nov 30 – Dec 6Nov 30–Dec 6	A bit above +1.6 °F	A bit above +43%	56° / 45°

Coming months

When	TemperatureTemp.	Rain
November	A bit above +1.6 °F	A bit above +36%
December	A bit above +1.6 °F	A bit above +23%
January	A bit above +1.8 °F	Above +51%
February	Normal +0.7 °F	A bit above +48%
March	A bit above +1.3 °F	A bit above +32%

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. The long-range sea temperature isn't usable at this spot (the model's grid cell falls on land).

Portsmouth climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Portsmouth is from September to October and from April to June: highs of 70 °F to 85 °F, about 9 rainy days a month and 6 hours of sunshine a day.

Hurricane season: from July to September, peaking in September. In the last 30 years (1996–2025), 20 tropical cyclones passed within 93 mi of Portsmouth, about 7 every 10 years; 5 of them with hurricane-force winds (74 mph or more). The most recent: Ophelia, in September 2023.

50° 33°

JanJ
53° 35°

FebF
60° 41°

MarM
70° 49°

AprA
78° 59°

MayM
85° 68°

JunJ
89° 72°

JulJ
87° 70°

AugA
81° 65°

SepS
73° 54°

OctO
62° 44°

NovN
55° 37°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves	Cyclones
JanuaryJan	50°	33°	3.65 in	8	4.6	44°	2.1 ft	–
FebruaryFeb	53°	35°	3.20 in	7	4.9	41°	2.1 ft	–
MarchMar	60°	41°	3.94 in	9	6.0	45°	2.2 ft	–
AprilApr	70°	49°	3.42 in	8	6.8	54°	2.1 ft	–
MayMay	78°	59°	3.96 in	10	7.4	63°	1.8 ft	–
JuneJun	85°	68°	4.54 in	11	7.4	72°	1.5 ft	1
JulyJul	89°	72°	5.63 in	14	7.5	78°	1.4 ft	5
AugustAug	87°	70°	5.09 in	12	6.9	79°	1.5 ft	5
SeptemberSep	81°	65°	5.20 in	10	5.9	76°	2.1 ft	8
OctoberOct	73°	54°	4.25 in	7	5.5	68°	2.2 ft	1
NovemberNov	62°	44°	3.33 in	7	4.9	57°	2.3 ft	–
DecemberDec	55°	37°	3.65 in	8	4.1	49°	2.0 ft	–

Month	Water	Waves	Cyclones
Jan	44°	2.1 ft	–
Feb	41°	2.1 ft	–
Mar	45°	2.2 ft	–
Apr	54°	2.1 ft	–
May	63°	1.8 ft	–
Jun	72°	1.5 ft	1
Jul	78°	1.4 ft	5
Aug	79°	1.5 ft	5
Sep	76°	2.1 ft	8
Oct	68°	2.2 ft	1
Nov	57°	2.3 ft	–
Dec	49°	2.0 ft	–

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

A normal year brings 49.86 in of rain on about 110 days and about 2,200 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

Now61 °Ffeels like 62 °F

Tomorrow54 / 75 °F

It's 61 °F now (feels like 62 °F). Today, 58 °F to 74 °F; tomorrow, 54 °F to 75 °F.

Chance of rain

Today 2%
Fri 30 1%
Sat 31 0%
Sun 1 1%
Mon 2 9%
Tue 3 8%
Wed 4 20% 0.20 in

Today the chance of rain reaches 2%. The next day with likely rain is Wednesday 4: 20% and 0.20 in.

Recent rain: last 24 hours, 0.00 in; last 3 days, 0.00 in; last 7 days, 0.01 in.

Humidity and dew point

Humidity90%

Dew point58 °F

Humidity is 90% now and the dew point is 58 °F. The temperature is very close to the dew point: fog may form.

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

Visibility and fog

Now8.6 migood

Clouds73%

Visibility is good now (8.6 mi). No fog expected today.

UV index

Now0

Today's peak4moderate

Fri 30: 4 · Sat 31: 4 · Sun 1: 4

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 Anglers expect normal activity
↘ Falling · now Anglers say fish feed more before the change

30.2030.40 30.12

Falling now (−0.04 inHg in 3 hours). It barely changes over the next 48 hours. Falling pressure: anglers say fish feed more before the change. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityModerate · 52

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
Tue 27	Mainly clear	46 / 71 °F	0	6 mph N
Mon 26	Mainly clear	48 / 67 °F	0	6 mph NNW
Sun 25	Clear sky	52 / 66 °F	0	10 mph NE
Sat 24	Partly cloudy	53 / 65 °F	0	11 mph NE
Fri 23	Light drizzle	49 / 66 °F	0.01 in	11 mph NNE
Thu 22	Mainly clear	48 / 66 °F	0	8 mph NNW
Wed 21	Clear sky	54 / 64 °F	0	13 mph N

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Tue 20	Clear sky	53 / 69 °F	0	13 mph N
Mon 19	Overcast	53 / 64 °F	0	15 mph NNE
Sun 18	Overcast	51 / 60 °F	0	14 mph NNE
Sat 17	Light rain	53 / 71 °F	0.92 in	17 mph N
Fri 16	Partly cloudy	64 / 85 °F	0	10 mph SSW
Thu 15	Overcast	66 / 72 °F	0	11 mph NNE
Wed 14	Mainly clear	65 / 87 °F	0	7 mph SW
Tue 13	Overcast	56 / 81 °F	0	6 mph SW
Mon 12	Overcast	63 / 73 °F	0	14 mph WNW
Sun 11	Light rain	69 / 78 °F	0.67 in	14 mph SSE
Sat 10	Light drizzle	62 / 72 °F	0.05 in	11 mph ENE
Fri 9	Overcast	63 / 78 °F	0	5 mph NE
Thu 8	Overcast	55 / 83 °F	0	7 mph SW
Wed 7	Overcast	47 / 72 °F	0	5 mph SSE
Tue 6	Clear sky	55 / 67 °F	0	8 mph NNE
Mon 5	Light drizzle	63 / 72 °F	0.02 in	7 mph NNW
Sun 4	Rain	67 / 73 °F	0.93 in	6 mph NNW
Sat 3	Light drizzle	65 / 74 °F	0.11 in	10 mph NNE
Fri 2	Overcast	68 / 87 °F	0	10 mph SW
Thu 1	Overcast	63 / 85 °F	0	7 mph SSW
Wed 30	Light drizzle	64 / 79 °F	0.02 in	7 mph SE
Tue 29	Light drizzle	63 / 75 °F	0.04 in	4 mph E
Mon 28	Overcast	60 / 74 °F	0	8 mph WNW

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 PortsmouthQuestions

What's the weather like today in Portsmouth?

Overcast, from 58 °F to 74 °F, with a light breeze from the northeast (4 mph) and a 2% chance of rain.

Will it rain tomorrow in Portsmouth?

On Friday 30 the chance of rain is 1% (0.00 in): clear sky.

How warm will it be this week?

Between a low of 54 °F and a high of 75 °F; the warmest day, Friday 30.

What's the UV index today?

It reaches 4 (moderate). Hat, sunglasses and sunscreen around midday.

Is the pressure rising or falling?

It's 30.28 inHg and falling: −0.06 inHg over the last 24 hours.

When is the best time to visit Portsmouth?

The best time to visit Portsmouth is from September to October and from April to June: highs of 70 °F to 85 °F, about 9 rainy days a month and 6 hours of sunshine a day.

What is the weather like in Portsmouth in October?

In October, Portsmouth normally sees highs of 73 °F and lows of 54 °F, with about 7 rainy days (4.25 in for the month) and 5 hours of sunshine a day. The sea is around 68 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Portsmouth?

The warmest is July, with average highs of 89 °F, and the coldest January, with lows of 33 °F. The wettest is July (5.63 in) and the driest, February.

When is hurricane season in Portsmouth?

Hurricane season: from July to September, peaking in September. In the last 30 years (1996–2025), 20 tropical cyclones passed within 93 mi of Portsmouth, about 7 every 10 years; 5 of them with hurricane-force winds (74 mph or more). The most recent: Ophelia, in September 2023.

More about Portsmouth today

Weather near Portsmouth

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 6.5 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 11:59 pm (local time).

Spotted a mistake? Tell us · Where the weather and sea data come from