Portsmouth Weather in June
What's the weather like in Portsmouth (Saint John) in June 2025?
The climate in Portsmouth during June can be summarized as hot, humid and wet.
June is in the summer in Portsmouth and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (87°F), whilst at night 24°C (74°F) is normal.
| Daytime temperature | 30.8°C 87.4°F |
|---|---|
| Nightly temperature | 23.5°C 74.2°F |
| Average temperature | 27.1°C 80.8°F |
| Daily sunshine | 8.1 hrs |
| Avg rainfall | 173 mm 6.8 ins |
| Rainy days | 18 days |
| Sea temperature | 28.1°C 82.5°F |
| Humidity | 79% |
| Windspeed | 20.5kph 13 mph |
On average June is the 6th driest month of the year in Portsmouth with around 173mm 6.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 18 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.1 hours of sunshine per day.
June temperatures in Portsmouth
June rainfall
June 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 June 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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