Portsmouth Weather in March
March in Portsmouth brings low temperatures, with daytime highs of 7°C (45°F) and nights around -3°C (27°F). Quite a bit of snow/rainfall is expected, around 116 mm (4.6 in), so pack an umbrella.
Rainfall in Portsmouth in March
Past climate data indicates that roughly 11 days will see snow/rain, totalling around 116 mm (4.6 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Portsmouth in March
If you're visiting Portsmouth in March, expect highs of 7°C (45°F) and overnight lows around -3°C (27°F). The days stay cool from start to finish. Layering up well will make outdoor time much more comfortable. Nights are well below freezing at -3°C (27°F). An extra blanket is a good idea if you feel the cold, especially in older or less well-heated accommodation.
Sunshine in Portsmouth in March
The days are predominantly sunny, with an estimated total of around 210 hours of sunshine. Despite the cool temperatures, these sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.If you prefer dry days with pleasant temperatures, March may not be the ideal month to visit Portsmouth. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Portsmouth's climate page.
Portsmouth Temperature in March
Min Temperature
-3°C (27°F)
Max Temperature
7°C (45°F)
Chance of Rain
37%
Precipitation
116 mm (4.6 in)
Rainy days
11 days
Humidity
64% *
Sunshine
210 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Portsmouth typically rise from around 3°C (37°F) at the start of March to approximately 11°C (52°F) by the end. Nights are very cold, with lows typically ranging from -7°C (19°F) to 1°C (34°F).
Average temperatures in March
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in March
Historical weather for Portsmouth in March
Browse day-by-day weather records for Portsmouth spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Portsmouth historical weather extremes in March
Based on weather observations in Portsmouth between 1999 and 2026, these are the recorded extremes during March.
- The coldest night in March in Portsmouth was on March 2, 2001, with a minimum of -18°C (0°F).
Best Places in the United States of America in March
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in March →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Portsmouth in March
We recommend to layer up for chilly conditions in Portsmouth in March. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Portsmouth in March
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Portsmouth's climate page.
Temperature Rainfall Sunshine Humidity
See the full Portsmouth climate overview or explore weather in the United States of America.
