Last updated: June 24, 2025
In April, the average temperature in Portsmouth, United States hovers around 13°C (55°F). While daylight can bring warm highs of 30°C (87°F), be prepared for chilly lows plunging down to -3°C (26°F). Throughout the month, expect approximately 128 mm (5.0 in) of precipitation spread over 13 days, contributing to a notably high average humidity of 85%.
In April in Portsmouth, the average temperature is 13°C (55°F), with maximums reaching up to 30°C (87°F) and minimums dropping as low as -3°C (26°F). This variability makes Portsmouth an ideal destination for travelers who enjoy a range of weather conditions, so be sure to pack accordingly!
In Portsmouth in April, the precipitation amount is 128 mm (5.0 in) spread over 13 days.
In Portsmouth in April, humidity is 85%. With an average temperature of 13°C (55°F), this humidity feels like a heavy blanket wrapping around you, making even short walks feel exhausting and urging travelers to seek shade and refreshment frequently.
In Portsmouth in April, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 April’s weather to other months in Portsmouth, focusing on differences in temperature, rainfall, humidity, and UV levels.
| 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 |