Portsmouth Weather in October

The climate in Portsmouth during October can be summarized as mild and reasonably dry.

October is in the fall / autumn in Portsmouth and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 20°C (68°F), whilst at night 6°C (42°F) is normal.

On average October is the driest month of the year in Portsmouth with around 63mm 2.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 6.7 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Portsmouth in October 2025.