Portsmouth weather in July

In July, Portsmouth sees average daytime highs of 75°F and overnight lows near 65°F, with 3.1 in of rain across 10.6 wet days and about 14.9 hours of daylight. It is the 1st-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 75°F through the month. The sky is clear or mostly clear about 30% of the time in July, and the air most often feels humid.

Daylight stretches from about 15 h 06 min at the start of July to 14 h 24 min by month's end. Set against the rest of the year, July is Portsmouth's 4th-clearest and 11th-windiest month. For the whole year in context, see Portsmouth's year-round climate.

Daytime high
75°
1st warmest
Overnight low
65°
12th coldest
Rainfall
3.1 in
10.6 wet days
Daylight
14 h 54 min
4:22 AM – 7:15 PM
Cloud cover
57%
4th clearest
Wind
8 mph
11th windiest
Solar energy
6.11 kWh/m²
Travel score
6.9
out of 10

Portsmouth is city in Rockingham County, New Hampshire, United States.

Density
494/km²
people per km²
Founded
1630

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 75°F through the month.

A typical July day in Portsmouth reaches about 75°F in the afternoon and slips back to 65°F overnight — a 11°F spread between the day's warmth and the night's chill. On most days the high lands between 69°F and 83°F. Set against its neighbours, July runs about 6°F warmer than June and on par with August.

50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
17463
27463
37463
47464
57564
67564
77564
87564
97564
107564
117564
127565
137565
147565
157665
167665
177665
187665
197665
207665
217665
227665
237665
247665
257665
267665
277665
287665
297665
307665
317665

How July really feels in Portsmouth

Once humidity and wind are folded in, July averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

July sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Portsmouth weather by month

How July compares with the rest of the year at a glance. July is the 1st-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan34° / 22°3.69.96.79.20.0
Feb35° / 23°3.49.1610.20.0
Mar41° / 30°4.511.25.211.60.2
Apr51° / 40°4.210.61.313.12.4
May60° / 49°3.310.5014.44.7
Jun69° / 58°3.610.6015.16.3
Jul75° / 65°3.110.6014.96.9
Aug74° / 64°3.28.8013.87.2
Sep68° / 57°3.48.5012.36.6
Oct58° / 47°4.49.90.210.84.5
Nov48° / 37°3.89.71.29.51.8
Dec39° / 28°4.610.84.98.90.1

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 23% of July, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15050
25050
35149
45248
55248
65446
75446
85446
95545
105545
115545
125545
135545
145545
155446
165446
175446
185446
195248
205248
215248
225248
235248
245149
255248
265248
275248
285248
295347
305347
315446

Chance of precipitation in July

Any precipitation

Portsmouth gets around 3.1 in of rain over 10.6 wet days in July, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 34% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
134
234
333
433
533
633
732
832
933
1033
1133
1233
1334
1434
1534
1634
1735
1835
1936
2036
2136
2236
2336
2436
2536
2636
2735
2835
2935
3034
3134

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

Most of July feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, July lands in the humid band about 34% of days. Sticky, muggy-or-worse air turns up on roughly 32% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1162834192
2152835203
3142835203
4142835203
5132835203
6122935213
7122935213
8112935223
9102935223
10102935233
1192835244
1292835254
1382735264
1482735264
1582635274
1672635284
1772534294
1872434305
1972434315
2072334325
2162234325
2262234335
2362134335
2462134345
2562134345
2662133345
2762133355
2862133345
2962233345
3062233345
3162233345

Wind in July

Winds average 8 mph in July.

Across July, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light breeze
258light breeze
268light breeze
278light breeze
287light breeze
297light breeze
307light breeze
317calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 15 h 06 min at the start of July to 14 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over July. Sunrise moves from 4:12 AM to 4:36 AM, and sunset from 7:21 PM to 7:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.14:127:21
215.14:127:21
315.14:137:21
415.14:137:20
515.14:147:20
615.14:157:20
715.14:157:20
815.14:167:19
915.04:177:19
1015.04:177:19
1115.04:187:18
1215.04:197:18
1315.04:207:17
1414.94:207:17
1514.94:217:16
1614.94:227:15
1714.94:237:15
1814.84:247:14
1914.84:257:13
2014.84:257:12
2114.84:267:12
2214.74:277:11
2314.74:287:10
2414.74:297:09
2514.64:307:08
2614.64:317:07
2714.64:327:06
2814.54:337:05
2914.54:347:04
3014.54:357:03
3114.44:367:02

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 6.11 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 1.54 kWh/m² to a high of 6.11 kWh/m² in July across the year — July's 6.11 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.3Intense
46.3Intense
56.3Intense
66.3Intense
76.3Intense
86.3Intense
96.2Intense
106.2Intense
116.2Intense
126.2Intense
136.2Intense
146.1Intense
156.1Intense
166.1Intense
176.1Intense
186.0Intense
196.0Intense
206.0Bright
216.0Bright
226.0Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in July

Hazard calendar for Portsmouth

In seasonPeak

In July, Portsmouth sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Portsmouth sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is July a good time to visit Portsmouth?

Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.9
Sightseeing
2nd-best month of the year
5.9
Beach & pool
1st-best month of the year

July is a reasonable time to visit Portsmouth for sightseeing.

What to pack for Portsmouth in July

From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In July, Portsmouth sees daytime highs around 75°F and nights near 65°F. Pack sun protection. Worth having: light clothes and rain gear. About 11 days see rain.

sun protectionlight clothesrain gear

Sea temperature near Portsmouth in July

The nearest coast averages about 63°F in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 65°F and coldest in March near 38°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°F)Comfort
Jan42Bracing
Feb39Bracing
Mar38Bracing
Apr42Bracing
May49Bracing
Jun57Bracing
Jul63Cool
Aug65Cool
Sep62Cool
Oct55Bracing
Nov49Bracing
Dec45Bracing

UV index in Portsmouth in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Portsmouth peaks around July 10 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 23 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighHighModerateModerateLowJul 10UV 7Dec 23UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr5High
May7High
Jun7High
Jul7Very high
Aug4Moderate
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Portsmouth?

Portsmouth sits at 43.1°N, 70.8°W, 20 ft above sea level, in United States. The nearest listed city is Dover, 9.9 mi away.

Topography around Portsmouth

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Portsmouth.

Within 2 miles, the terrain around Portsmouth has only modest variations in elevation — a maximum elevation change of 161 ft around an average of 39 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 430 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,454 ft.

The land around Portsmouth is covered by trees (45%), water (22%) and artificial surfaces (21%) within 2 miles, trees (49%) and water (36%) within 10 miles, and trees (61%) and water (32%) within 50 miles.

2 miles
161 ft
10 miles
430 ft
50 miles
2,454 ft
treesgrasslandartificial surfaceswaterwetland
July weather nearby: Dover 9.9 mi · Amesbury 17 mi · Rochester 19 mi · Newburyport 19 mi · Sanford 25 mi · Haverhill 26 mi · Salem 30 mi · Derry Village 31 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Portsmouth (43.077°, -70.7577°, elevation 20 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).