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

13.8°C

across all months

Warmest month

30.3°C

Jul average high

Coolest month

-2.6°C

Jan average low

Annual rainfall

1273mm

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

36.9°C

28 August 2024

Coldest day

-23.9°C

22 January 2025

Wettest day

96.1mm

23 June 2017

Windiest day

7.5m/s

23 December 2022