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Portsmouth Weather in October
Portsmouth in October sees high temperatures, with highs around 29°C (84°F) and overnight lows of 26°C (79°F). Rainfall is at its peak this month, around 137 mm (5.4 in) on average, so waterproofs are essential.
Rainfall in Portsmouth in October
With this being the wettest month, keeping an umbrella on hand might save you from getting wet from a sudden shower. This month experiences about 19 days of rain according to historical data, averaging 137 mm (5.4 in). Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in Portsmouth in October
October in Portsmouth sees highs of 29°C (84°F) and lows of 26°C (79°F) overnight. This kind of day-to-night contrast is typical for this time of year. Nights are warm at 26°C (79°F), which can make sleeping uncomfortable. Keeping windows open or using a fan can help. A cold shower before bed is also a good way to cool down.
Sunshine in Portsmouth in October
Expect sunny days throughout the month, with an estimated 220 hours of sunshine. This makes it a pleasant time to visit Portsmouth.October in Portsmouth can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
Portsmouth Temperature in October
Min Temperature
26°C (79°F)
Max Temperature
29°C (84°F)
Chance of Rain
65%
Precipitation
137 mm (5.4 in)
Rainy days
19 days
Humidity
73% *
Sunshine
220 hours *
Percentage Sunshine
*
* Data from: Douglas-Charles Airport, Dominica (18 KM, 11 Miles).
Portsmouth Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Portsmouth - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Portsmouth typically stay consistent throughout October, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in October
Historical weather records 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 35 years of weather observations (1990-2025), these are the most extreme conditions recorded in Portsmouth.
- The hottest October day on record in Portsmouth reached 38°C (100°F) (October 2, 1994).
- The lowest daytime temperature in October was 26°C (79°F), recorded on October 10, 2021.
- The lowest overnight temperature recorded in October was 11°C (52°F) (October 15, 2022).
Best Places in Dominica in October
Find out more about the weather in Dominica and which places have the best travel conditions in this month. See all of Dominica in October →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Portsmouth in October
Warm but pleasant conditions in Portsmouth in October. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. 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 October
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Swimming9/10 -
Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Portsmouth 3-Day Forecast
More climate data for Portsmouth
Temperature Rainfall Sunshine Humidity
See the full Portsmouth climate overview or explore weather in Dominica.
Popular in October
Where to go in October - average daytime high across popular destinations.
Portsmouth
29°C (84°F) Castle Bruce
29°C (84°F) Scotts Head Village29°C (84°F) Salisbury29°C (84°F) Marigot29°C (84°F) Calibishie29°C (84°F) Roseau29°C (84°F) Pont Cassé29°C (84°F) Bucket list
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