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

10.2°C

across all months

Warmest month

25.1°C

Jul average high

Coolest month

-4.1°C

Jan average low

Annual rainfall

1179mm

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

32.4°C

24 June 2025

Coldest day

-23.6°C

4 February 2023

Wettest day

63.7mm

11 December 2024

Windiest day

11.6m/s

4 April 2024