Weather in Portsmouth in December
Portsmouth, United States averages a high of 11.7°C (53.1°F) and low of 3.6°C (38.5°F) in December, with 9 rain days and 6.9 hours of daily sunshine. Travel score: 59.9/100 (Mixed). The best time to visit Portsmouth is May.
High
12°C53°F
Low
4°C38°F
🌧️
9
rain days
☀️
6.9
hrs/day sunshine
💧
74%
humidity
60— Mixed
December in Portsmouth is cool and occasionally wet — mixed conditions — plan indoor alternatives.
What are the average temperatures in Portsmouth?
How much does it rain in Portsmouth in December?
Portsmouth receives an average of 86.3mm of rainfall across 9 rainy days in December. The annual total is 1149.2mm.
What should I pack for Portsmouth in December?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Warm coat
Cool weather with highs around 12°C
🧶
Sweaters and warm layers
Layer up for comfort
🧤
Warm gloves
Cold nights around 4°C
🧣
Warm scarf
Protect against cold winds
🎉Visiting United States in December?
Don't miss any public holidays — check before you book!
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Data based on 1994–2024 averages · Last updated: 2024-12-31