Mid-summer · Weather & things to do
Portsmouth in July
Portsmouth warms up: highs climb to 74°F (23°C), from 67°F in June, with lows of 64°F (18°C) and about 3.6 in (91 mm) of rain.
It scores 75/100 for comfort, 4th of 12, which makes it a solid shoulder-season month.
- Avg high
- 74°F (23°C)
- Avg low
- 64°F (18°C)
- Rain
- 3.6 in (91 mm)
- Humidity
- 84%
- Cloud cover
- 55%
- Daylight
- ~14 h 53 min
- Comfort score
- 75/100 · Great
What July feels like
Days are warm, averaging 74°F (23°C).
Nights cool to an average low of 64°F (18°C).
With 84% average humidity, it feels muggy.
Showers are part of the month, adding up to about 3.6 in (91 mm).
Plan around July
July is shoulder season: good weather, a step below the best months (September).
- First warm month: highs reach 74°F, up from 67°F in June.
- Humidity season begins: 84% on average, up from 85% in June.
- Comfort slips from 80/100 in June to 75/100.
- July sits inside the May – Oct window our Boston to Portland route recommends.
What to pack for July
- Light, breathable clotheshighs average 74°F
- Sunscreen, sunglasses and a hathigh UV on clear days
- Quick-dry fabrics84% average humidity
- Packable rain jacket or umbrellaabout 3.6 in of rain
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Portsmouth in July
With conditions on your side, the picks below favor time outside.
Portsmouth Harbor Cruises
Narrated harbor and Isles of Shoals cruises from Ceres Street dock.
Why now Our curated notes say it's best summer.
Prescott Park
Waterfront gardens across from Strawbery Banke with harbor views.
Why now July scores 75/100 for comfort, good conditions for being outside.
The Black Trumpet
Bistro and upstairs wine bar in an old waterfront building.
Why now Highs near 74°F and 3.6 in of monthly rain make this an easy outdoor pick.
USS Albacore Museum
Walk through a 1953 experimental submarine on dry land.
Odiorne Point State Park
Rocky shoreline trails and tide pools, plus the Seacoast Science Center.
Why now One to do outside while the weather is on your side.
Nearby in July
- New Hampshire in July~42 mi · highs 81°F, 3.9 in rain · 4°C (8°F) warmer by day, about as wet
- Portland, Maine in July~48 mi · highs 69°F, 3.8 in rain · 3°C (5°F) cooler by day, about as wet
- Boston in July~51 mi · highs 82°F, 3.7 in rain · 5°C (9°F) warmer by day, about as wet
- White Mountains in July~87 mi · highs 58°F, 4.7 in rain · 9°C (16°F) cooler by day, wetter
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Portsmouth in July: quick answers
Is July a good time to visit Portsmouth?
It's a good shoulder-season choice, scoring 75/100 against a best of 88 in September. Expect highs of 74°F (23°C) and 3.6 in (91 mm) of rain. July is inside the May – Oct window our Boston to Portland route recommends.
How hot is Portsmouth in July?
Average highs are 74°F (23°C) and average lows 64°F (18°C), making it the 2nd-warmest month by daytime highs.
Does it rain a lot in Portsmouth in July?
Some: about 3.6 in (91 mm) of rain falls across July on average, the 2nd-driest month of the year. The annual total is about 52.6 in (1337 mm).
What should I pack for Portsmouth in July?
Bring light, breathable clothes (highs average 74°F), sunscreen, sunglasses and a hat (high UV on clear days), quick-dry fabrics (84% average humidity), packable rain jacket or umbrella (about 3.6 in of rain) and comfortable walking shoes (most places below are best reached on foot or with short walks).
Routes in season in July
- Boston to Portland May – Oct
Planning Portsmouth in July?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.