Observed 2:55 AM EDT at KPSM

Portsmouth, NH weather

Clear and 34°1°.

Mostly agree

Now 34°1°

Clear · Feels like 30°−1°

Wind: 5 mph8 km/h; From the west-northwest. Light through 3 PM
Dew point: 31°0°; Dry, static shocks likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 41Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.47 inHg1032 hPa; Rising slowly · +0.02 inHg+0.6 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

13°7° cooler than this time yesterday (48°9° then, 34°1° now)

Good hours for

Low 34°1° today at 7 AM
Above 50°10° today by 11 AM
High 57°14° today at 2 PM
Below freezing tonight 4–8 AM (low 30°−1°)

TonightNear 37°3° · Clear
This morningUp to 51°11° by 11 AM · Clear
This afternoonNear 54°12° · Clear
TonightDown to 31°−1° by 5 AM · freezing, low 31°−1° · Clear
Tomorrow morningUp to 53°12° by 11 AM · freezing, low 30°−1° · Clear
Tomorrow afternoonUp to 61°16° by 2 PM · Clear
Tomorrow nightDown to 38°3° by 2 AM · 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 3a	Clear	37°3° (likely 30°−1° to 37°3°)	37°3°	0%	0 mph0 km/h, gusts 7 mph11 km/h	72%	13%	0
Sat 4a	Clear	37°3° (likely 29°−2° to 37°3°)	37°3°	0%	0 mph0 km/h, gusts 7 mph11 km/h	72%	11%	0
Sat 5a	Clear	36°2° (likely 29°−2° to 36°2°)	36°2°	0%	0 mph0 km/h, gusts 8 mph13 km/h	75%	7%	0
Sat 6a	Clear	35°2° (likely 28°−2° to 35°2°)	35°2°	0%	0 mph0 km/h, gusts 7 mph11 km/h	75%	7%	0
Sat 7a	Sunny	34°1° (likely 28°−2° to 34°1°)	34°1°	0%	0 mph0 km/h, gusts 7 mph11 km/h	78%	1%	0
Sat 8a	Sunny	34°1° (likely 29°−2° to 35°2°)	34°1°	0%	0 mph0 km/h, gusts 6 mph9 km/h	82%	1%	0
Sat 9a	Sunny	39°4° (likely 39°4° to 41°5°)	39°4°	0%	0 mph0 km/h, gusts 6 mph9 km/h	67%	1%	1
Sat 10a	Sunny	47°8° (likely 46°8° to 48°9°)	47°8°	0%	0 mph0 km/h, gusts 5 mph8 km/h	51%	2%	2
Sat 11a	Sunny	51°11° (likely 51°11° to 52°11°)	51°11°	0%	0 mph0 km/h, gusts 7 mph11 km/h	44%	3%	3
Sat 12p	Sunny	54°12° (likely 53°12° to 55°13°)	54°12°	0%	0 mph0 km/h, gusts 8 mph14 km/h	38%	2%	4
Sat 1p	Sunny	56°13° (likely 56°13° to 57°14°)	56°13°	0%	0 mph0 km/h, gusts 7 mph10 km/h	34%	1%	4
Sat 2p	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	0 mph0 km/h, gusts 5 mph9 km/h	34%	0%	4
Sat 3p	Sunny	56°13° (likely 56°13° to 59°15°)	56°13°	0%	0 mph0 km/h, gusts 5 mph8 km/h	37%	0%	3
Sat 4p	Sunny	57°14° (likely 55°13° to 58°14°)	57°14°	0%	0 mph0 km/h, gusts 7 mph11 km/h	38%	0%	2
Sat 5p	Sunny	53°12° (likely 53°12° to 55°13°)	53°12°	0%	0 mph0 km/h, gusts 7 mph12 km/h	50%	0%	1
Sat 6p	Clear	50°10° (likely 48°9° to 50°10°)	50°10°	0%	0 mph0 km/h, gusts 8 mph14 km/h	54%	0%	0
Sat 7p	Clear	47°8° (likely 45°7° to 47°8°)	47°8°	0%	0 mph0 km/h, gusts 8 mph13 km/h	65%	0%	0
Sat 8p	Clear	43°6° (likely 43°6° to 45°7°)	43°6°	0%	0 mph0 km/h, gusts 8 mph13 km/h	79%	0%	0
Sat 9p	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	0 mph0 km/h, gusts 9 mph14 km/h	79%	0%	0
Sat 10p	Clear	39°4° (likely 39°4° to 43°6°)	39°4°	0%	0 mph0 km/h, gusts 8 mph13 km/h	79%	0%	0
Sat 11p	Clear	38°3° (likely 38°3° to 43°6°)	38°3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	79%	1%	0
Sun 12a	Clear	37°3° (likely 37°3° to 41°5°)	37°3°	0%	0 mph0 km/h, gusts 7 mph11 km/h	79%	2%	0
Sun 1a	Clear	36°2° (likely 36°2° to 40°4°)	36°2°	0%	0 mph0 km/h, gusts 6 mph10 km/h	82%	1%	0
Sun 2a	Clear	35°2° (likely 35°2° to 39°4°)	35°2°	0%	0 mph0 km/h, gusts 6 mph9 km/h	89%	1%	0
Sun 3a	Clear	33°1° (likely 33°1° to 39°4°)	33°1°	0%	0 mph0 km/h, gusts 6 mph9 km/h	96%	1%	0
Sun 4a	Clear	32°0° (likely 32°0° to 38°3°)	32°0°	0%	0 mph0 km/h, gusts 5 mph9 km/h	100%	0%	0
Sun 5a	Clear	31°−1° (likely 31°−1° to 37°3°)	31°−1°	0%	0 mph0 km/h, gusts 6 mph9 km/h	100%	0%	0
Sun 6a	Clear	30°−1° (likely 30°−1° to 36°2°)	30°−1°	0%	0 mph0 km/h, gusts 5 mph9 km/h	100%	3%	0
Sun 7a	Sunny	30°−1° (likely 30°−1° to 36°2°)	30°−1°	0%	0 mph0 km/h, gusts 6 mph9 km/h	100%	7%	0
Sun 8a	Sunny	36°2° (likely 32°0° to 38°3°)	36°2°	0%	0 mph0 km/h, gusts 5 mph8 km/h	85%	9%	0
Sun 9a	Sunny	41°5° (likely 39°4° to 45°7°)	41°5°	0%	0 mph0 km/h, gusts 5 mph9 km/h	82%	6%	1
Sun 10a	Sunny	47°8° (likely 47°8° to 53°12°)	47°8°	0%	0 mph0 km/h, gusts 7 mph11 km/h	71%	3%	2
Sun 11a	Sunny	53°12° (likely 53°12° to 58°14°)	53°12°	0%	0 mph0 km/h, gusts 7 mph11 km/h	57%	0%	3
Sun 12p	Sunny	57°14° (likely 57°14° to 62°17°)	57°14°	0%	0 mph0 km/h, gusts 7 mph12 km/h	49%	0%	4
Sun 1p	Sunny	60°16° (likely 60°16° to 64°18°)	60°16°	0%	0 mph0 km/h, gusts 9 mph14 km/h	46%	0%	4
Sun 2p	Sunny	61°16° (likely 61°16° to 66°19°)	61°16°	0%	5 mph8 km/h from S, gusts 9 mph15 km/h	44%	0%	4
Sun 3p	Sunny	61°16° (likely 61°16° to 66°19°)	61°16°	0%	5 mph8 km/h from S, gusts 10 mph16 km/h	48%	0%	3
Sun 4p	Sunny	61°16° (likely 60°16° to 66°19°)	61°16°	0%	5 mph8 km/h from S, gusts 11 mph17 km/h	49%	0%	2
Sun 5p	Sunny	58°14° (likely 57°14° to 62°17°)	58°14°	0%	5 mph8 km/h from S, gusts 10 mph17 km/h	57%	0%	1
Sun 6p	Clear	55°13° (likely 53°12° to 56°13°)	55°13°	0%	5 mph8 km/h from S, gusts 9 mph15 km/h	64%	0%	0
Sun 7p	Clear	52°11° (likely 50°10° to 52°11°)	52°11°	0%	5 mph8 km/h from S, gusts 10 mph15 km/h	71%	0%	0
Sun 8p	Clear	47°8° (likely 47°8° to 50°10°)	46°8°	0%	5 mph8 km/h from SW, gusts 10 mph16 km/h	83%	0%	0
Sun 9p	Clear	45°7° (likely 45°7° to 49°9°)	44°7°	0%	5 mph8 km/h from SW, gusts 8 mph12 km/h	86%	0%	0
Sun 10p	Clear	43°6° (likely 43°6° to 48°9°)	41°5°	0%	5 mph8 km/h from SW, gusts 8 mph12 km/h	89%	0%	0
Sun 11p	Clear	42°6° (likely 42°6° to 47°8°)	40°4°	0%	5 mph8 km/h from SW, gusts 8 mph13 km/h	89%	0%	0
Mon 12a	Clear	41°5° (likely 41°5° to 48°9°)	39°4°	0%	5 mph8 km/h from SW, gusts 9 mph14 km/h	89%	0%	0
Mon 1a	Clear	39°4° (likely 39°4° to 48°9°)	37°3°	0%	5 mph8 km/h from SW, gusts 9 mph15 km/h	92%	1%	0
Mon 2a	Clear	38°3° (likely 38°3° to 45°7°)	36°2°	0%	5 mph8 km/h from SW, gusts 9 mph14 km/h	92%	1%	0

Days ahead

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

Today, Oct 24. Mostly sunny. High 58°14°, low 34°1°. Typical 57°14° / 36°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 34°1°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 43°6°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 31°−1°
  Dry
Official NWS forecast
Today: Sunny, with a high near 58. West wind around 0 mph.
Tonight: Mostly clear, with a low around 34. Northwest wind around 0 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
57°14°–59°15°
Low, likely
27°−3°–34°1°
Typical high / low
57°14° / 36°2°
Wind
6 mph10 km/h, gusts 14 mph22 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 63°17°, low 36°2°. Typical 57°14° / 36°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Day: Sunny, with a high near 63. Southwest wind 0 to 5 mph.
Night: Clear, with a low around 36. Southwest wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–66°19°
Low, likely
31°−1°–36°2°
Typical high / low
57°14° / 36°2°
Wind
7 mph12 km/h, gusts 14 mph22 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 68°20°, low 36°2°. Typical 56°13° / 36°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 44°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 44°6°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 68.
Night: Mostly clear, with a low around 36.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–68°20°
Low, likely
36°2°–43°6°
Typical high / low
56°13° / 36°2°
Wind
9 mph15 km/h, gusts 24 mph38 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 53°12°, low 28°−2°. Typical 56°13° / 35°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 51°10°
  Dry
3. Evening
  6 PM–midnight
  Clear, 41°5°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 32°0°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 53.
Night: Mostly clear, with a low around 28.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
51°11°–53°12°
Low, likely
28°−2°–39°4°
Typical high / low
56°13° / 35°2°
Wind
11 mph17 km/h, gusts 19 mph31 km/h
UV peak
4
Wednesday, Oct 28. Mostly sunny. High 53°12°, low 33°1°. Typical 56°13° / 35°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 32°0°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 49°10°
  Dry
3. Evening
  6 PM–midnight
  Clear, 42°5°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 39°4°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 53.
Night: Mostly clear, with a low around 33.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
47°8°–53°12°
Low, likely
28°−2°–35°2°
Typical high / low
56°13° / 35°2°
Wind
8 mph13 km/h, gusts 16 mph25 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 61°16°, low 45°7°. Typical 55°13° / 35°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 61.
Night: Mostly clear, with a low around 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–64°18°
Low, likely
36°2°–45°7°
Typical high / low
55°13° / 35°2°
Wind
9 mph15 km/h, gusts 26 mph42 km/h
UV peak
4
Friday, Oct 30. Partly sunny. High 65°18°, low 46°8°. Typical 55°13° / 35°2°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 65.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
60°16°–68°20°
Low, likely
44°7°–49°9°
Typical high / low
55°13° / 35°2°
Wind
13 mph20 km/h, gusts 29 mph47 km/h
UV peak
3
Saturday, Oct 31. Cloudy. High 61°16°, low 45°7°. Typical 54°12° / 34°1°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 60°15°
  Dry
3. Evening
  6 PM–midnight
  Clear, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 44°7°
  Dry
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
52°11°–65°18°
Low, likely
41°5°–50°10°
Typical high / low
54°12° / 34°1°
Wind
12 mph19 km/h, gusts 25 mph40 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 61°16°, low 46°8°. Typical 54°12° / 34°1°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 60°15°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 53°12°
  20% chance
4. Overnight
  midnight–6 AM
  Drizzle, 51°11°
  30% chance · 0.01 in0.3 mm
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
54°12°–65°18°
Low, likely
38°3°–52°11°
Typical high / low
54°12° / 34°1°
Wind
10 mph16 km/h, gusts 20 mph32 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 64°18°, low 51°11°. Typical 54°12° / 34°1°. Rain 0.07 in1.8 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  30% chance
2. Afternoon
  noon–6 PM
  Cloudy, 65°19°
  30% chance
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  30% chance · 0.04 in1 mm
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
61°16°–68°20°
Low, likely
48°9°–56°13°
Typical high / low
54°12° / 34°1°
Wind
12 mph20 km/h, gusts 29 mph47 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 58°, low 34°.
Tomorrow
Dry, high 63°, low 36°, warming up.
Monday
Dry, high 68°, low 36°, warming up.
Rest of week
Mostly dry, highs 53–65°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (GYX) (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 Seavey Island (IN MLLW)

2.4 mi

Below flood stage

Level: 3.8 ft

Forecast peak 9.1 ft Mon 12 PM

Reading from Sat 2 AM · NWS gauge page

Atlantic Coast at Hampton (IN MLLW)

11 mi

Below flood stage

Level: 3.9 ft

Forecast peak 9.4 ft Mon 12 PM

Reading from Sat 1:58 AM · NWS gauge page

Winnicut River near Portsmouth

3.8 mi

Level: 5.2 ft
Flow: 52 cfs

Reading from Sat 1:30 AM · NWS gauge page

Lamprey River near Newmarket

9.2 mi

Below flood stage

Level: 1.4 ft
Flow: 76 cfs

Reading from Sat 1:15 AM · NWS gauge page

For your home

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

Heating this week

About 71% less heating than a typical week.

This week 40Typical 135

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 30
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 14 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 31°F).

Open the windows?

Sun, 1:00 PM–4:00 PM

Good stretch to open the windows.

Is this typical?

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

Oct 24, today vs a typical year

Today’s expected high is about typical for the date.

Last 7 days vs normal

—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23
—SatOct 24

Portsmouth weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 38 min; Losing 2 min 44 s a day; shortest Dec 21, 1 h 39 min less
Golden hour: 5:06–6:04 PM; Morning 6:49–7:47 AM
Blue hour: 6:04–6:15 PM; Morning 6:38–6:49 AM; first light 6:38 AM

Stars tonight? Fair

Clear 3:42–6:38 AM, but the moon is 96% lit and up.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:16 AM · rises 4:43 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Portsmouth. Open water to the horizon.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Portsmouth, NH 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 Seavey Island (IN MLLW)

Atlantic Coast at Hampton (IN MLLW)

Winnicut River near Portsmouth

Lamprey River near Newmarket

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