Portsmouth climate

Typical historical weather for Portsmouth, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.

Want today's actual conditions instead? See the current forecast for Portsmouth.

Annual average

11.5°C

across all months

Warmest month

23.7°C

Jul average high

Coolest month

-1°C

Jan average low

Annual rainfall

1360mm

total per year

Monthly averages

Average daily high/low temperature (band) and monthly rainfall (bars).

● Avg high● Avg low▮ Rainfall

Records on file

Hottest day

28.8°C

21 July 2019

Coldest day

-20.2°C

14 February 2016

Wettest day

78.9mm

5 December 2020

Windiest day

14.7m/s

2 March 2018