June Weather in Portsmouth, United States

Last updated: June 24, 2025

In June, the average temperature in Portsmouth, United States hovers around 23°C (73°F), with a minimum of 9°C (49°F) and a maximum reaching up to 34°C (94°F). During this month, expect precipitation of about 157 mm (6.2 in) over approximately 14 days, accompanied by a high average humidity of 82%. This makes for a warm yet potentially rainy climate, perfect for tropical vibes!

June Temperature in Portsmouth

In June in Portsmouth, the average temperature is 23°C (73°F). Maximums can reach 34°C (94°F), and minimums can drop as low as 9°C (49°F). Be sure to pack a variety of clothing to enjoy the comfortable days and cooler nights during your travels.

June Weather in Portsmouth: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Portsmouth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portsmouth, June typically has an average temperature of 23°C (73°F), with highs reaching up to 34°C (94°F) and lows dropping to around 9°C (49°F).

Data source: Temperature data for Portsmouth generated using information from the Copernicus Climate Change Service.

June Precipitation in Portsmouth

In Portsmouth in June, the precipitation amount is 157 mm (6.2 in) spread over a duration of 14 days.

June Precipitation Trends in Portsmouth

The chart displays monthly precipitation patterns in Portsmouth, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Portsmouth, June typically receives around 157 mm (6.2 inches) of precipitation spread over approximately 14 days.

Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

June Humidity in Portsmouth

In Portsmouth in June, humidity is 82%. With an average temperature of 23°C (73°F), this humidity feels like a warm, sticky embrace, making outdoor activities feel a bit more strenuous but offering a tropical ambiance perfect for leisurely strolls and relaxed sightseeing.

June Average Humidity in Portsmouth

This chart illustrates the average monthly humidity levels in Portsmouth, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Portsmouth is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in Portsmouth

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.

Maximum UV Index Levels in Portsmouth for June

The chart shows the monthly maximum UV Index (UVI) for Portsmouth in June, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In June, the maximum UV index in Portsmouth typically reaches 10, which falls under the very high exposure category.

Data source: Portsmouth June UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How June Weather in Portsmouth Compares to Other Months

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.

This table compares monthly weather conditions in Portsmouth, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (35°F)	85 mm (3.3 inches)	88%	moderate
February Weather	4°C (39°F)	124 mm (4.9 inches)	88%	moderate
March Weather	8°C (47°F)	106 mm (4.2 inches)	87%	high
April Weather	13°C (55°F)	128 mm (5.0 inches)	85%	very high
May Weather	19°C (66°F)	128 mm (5.0 inches)	81%	very high
June Weather	23°C (73°F)	157 mm (6.2 inches)	82%	very high
July Weather	25°C (78°F)	107 mm (4.2 inches)	81%	very high
August Weather	24°C (75°F)	120 mm (4.7 inches)	73%	very high
September Weather	21°C (71°F)	109 mm (4.3 inches)	73%	very high
October Weather	15°C (60°F)	116 mm (4.5 inches)	78%	high
November Weather	7°C (45°F)	77 mm (3.0 inches)	89%	moderate
December Weather	4°C (40°F)	112 mm (4.4 inches)	87%	moderate