Portsmouth Weather in October
Portsmouth in October averages 16°C (61°F) during the day and 6°C (43°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Portsmouth in October
Past climate data indicates that roughly 13 days will see rain, totalling around 116 mm (4.6 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 October
Temperatures in Portsmouth in October top out at 16°C (61°F) and drop to 6°C (43°F) overnight. The difference between afternoon and evening temperatures is usually noticeable. Nights drop to 6°C (43°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Portsmouth in October
The month brings about 183 hours of sunlight, offering a comfortable mix of sun and overcast.If you prefer enjoying temperate temperatures and rain-free days, September typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
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 October
Min Temperature
6°C (43°F)
Max Temperature
16°C (61°F)
Chance of Rain
42%
Precipitation
116 mm (4.6 in)
Rainy days
13 days
Humidity
72% *
Sunshine
183 hours *
Percentage Sunshine
*
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Portsmouth typically drop from around 18°C (64°F) at the start of October to approximately 13°C (55°F) by the end. Nights are cold, with lows typically ranging from 2°C (36°F) to 8°C (46°F).
Average temperatures in October
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 October
Historical weather for Portsmouth in October
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 October
Based on 28 years of weather observations in Portsmouth between 1997 and 2025, these are the recorded extremes.
- The warmest day in October was on October 6, 2025, with a maximum of 30°C (86°F).
- On October 29, 2000, Portsmouth saw its coldest October day with temperatures maxing out at 2°C (36°F).
- The coldest night in October in Portsmouth was on October 31, 2001, with a minimum of -7°C (19°F).
Best Places in the United States of America in October
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 October →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Portsmouth in October
The weather can be unpredictable in October, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Portsmouth in October
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.
