Portsmouth Weather in July
Portsmouth in July averages 27°C (81°F) during the day and 17°C (63°F) at night. This is part of the summer season, and quite a bit of rainfall is expected this month.
Rainfall in Portsmouth in July
Rain is expected on roughly 12 days, totalling around 110 mm (4.3 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Portsmouth in July
In July, Portsmouth sees high temperatures, with highs of 27°C (81°F). Nights drop to around 17°C (63°F). July is typically considered a summer month. This kind of day-to-night contrast is typical for this time of year. Nights cool down to 17°C (63°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions. On average, this month sees the highest temperatures of the year. Worth packing a few lighter outfits.
Sunshine in Portsmouth in July
There are approximately 295 hours of sunshine this month, resulting in mostly clear days.If your ideal day consists of dry skies and pleasant temperatures, September typically offers the best circumstances for Portsmouth.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Portsmouth's climate page.
Portsmouth Temperature in July
Min Temperature
17°C (63°F)
Max Temperature
27°C (81°F)
Chance of Rain
40%
Precipitation
110 mm (4.3 in)
Rainy days
12 days
Humidity
72% *
Sunshine
295 hours *
Percentage Sunshine
*
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Portsmouth typically stay consistent throughout July, with daily highs averaging around 27°C (81°F). Nights are pleasant, with lows typically ranging from 15°C (59°F) to 18°C (64°F).
Average temperatures in July
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in July
Historical weather for Portsmouth in July
Browse day-by-day weather records for Portsmouth spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Portsmouth historical weather extremes in July
Based on weather observations in Portsmouth between 1997 and 2025, these are the recorded extremes during July.
- The hottest July day on record in Portsmouth reached 38°C (100°F) (July 22, 2011).
- The coldest July day was on July 2, 2009, with a maximum of 15°C (59°F).
- The lowest overnight temperature recorded in July was 6°C (43°F) (July 27, 2001).
- The heaviest July precipitation occurred on July 24, 2009, when 71 mm (2.8 in) of precipitation fell.
Best Places in the United States of America in July
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in July →
perfect weather
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tolerable
unpleasant
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What to Wear in Portsmouth in July
Warm weather calls for comfortable, breathable clothing in July. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Portsmouth in July
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Portsmouth's climate page.
Temperature Rainfall Sunshine Humidity
See the full Portsmouth climate overview or explore weather in the United States of America.
