Last updated: June 24, 2025
In June, the average temperature in Portsmouth, United States hovers around 18°C (64°F), creating a pleasantly mild atmosphere. Expect temperatures to range from a cool 11°C (51°F) at night to a warm 25°C (78°F) during the day. With an average humidity of 78%, it can feel a bit sticky at times. Be prepared for some rain, as 104 mm (4.1 in) of precipitation is expected over 10 days, making this a month to remember!
In June in Portsmouth, the average temperature is 18°C (64°F), with maximums reaching up to 25°C (78°F) and minimums dropping as low as 11°C (51°F). This mild climate makes it a great time to explore outdoor attractions and enjoy the local scenery.
In Portsmouth in June, the precipitation amount is 104 mm (4.1 in) over a period of 10 days.
In Portsmouth in June, humidity is 78%. With an average temperature of 18°C (64°F), this humidity feels like a warm, thick blanket wrapping around you, making traveling feel a bit sticky and sluggish, yet the coolness of the air tempers the intensity, inviting you to explore at a leisurely pace.
In Portsmouth in June, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Portsmouth.
UV Risk Categories
Weather in Portsmouth varies notably across the year, with each month offering distinct climate conditions. This page compares June’s weather to other months in Portsmouth, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 1°C (35°F) | 95 mm (3.8 inches) | 84% | moderate |
February Weather | 2°C (36°F) | 121 mm (4.8 inches) | 84% | moderate |
March Weather | 3°C (39°F) | 119 mm (4.7 inches) | 82% | high |
April Weather | 8°C (46°F) | 147 mm (5.8 inches) | 79% | very high |
May Weather | 12°C (55°F) | 132 mm (5.2 inches) | 75% | very high |
June Weather | 18°C (64°F) | 104 mm (4.1 inches) | 78% | very high |
July Weather | 22°C (72°F) | 104 mm (4.1 inches) | 76% | very high |
August Weather | 22°C (73°F) | 89 mm (3.5 inches) | 76% | very high |
September Weather | 20°C (67°F) | 110 mm (4.3 inches) | 75% | very high |
October Weather | 15°C (60°F) | 169 mm (6.7 inches) | 75% | high |
November Weather | 9°C (48°F) | 117 mm (4.6 inches) | 80% | moderate |
December Weather | 4°C (39°F) | 147 mm (5.8 inches) | 80% | low |