Portsmouth Weather in March
What's the weather like in Portsmouth (Saint John) in March 2025?
The climate in Portsmouth during March can be summarized as hot, humid and damp.
March is in the spring in Portsmouth and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a steamy 29°C (85°F), whilst at night 21°C (70°F) is normal.
| Daytime temperature | 29.2°C 84.5°F |
|---|---|
| Nightly temperature | 21.3°C 70.3°F |
| Average temperature | 25.2°C 77.4°F |
| Daily sunshine | 8 hrs |
| Avg rainfall | 110 mm 4.3 ins |
| Rainy days | 15 days |
| Sea temperature | 26.5°C 79.8°F |
| Humidity | 76% |
| Windspeed | 18.7kph 12 mph |
On average March is the 3rd driest month of the year in Portsmouth with around 110mm 4.3 inches of rain making it a damp time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.
On the flip side this corresponds to an average of 8 hours of sunshine per day.
March temperatures in Portsmouth
March rainfall
March hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Portsmouth in March 2025.
Other monthly averages
Portsmouth weather stats
| Hottest month: | July | 30.6°C 87.1°F |
|---|---|---|
| Driest month: | February | 95mm 3.7ins |
| Sunniest month: | April | 8.6hrs |
| Coldest month: | February | 28.3°C 82.9°F |
| Wettest month: | November | 301mm 11.9ins |
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