Last updated: June 24, 2025
In April, the average temperature in Portsmouth, United States hovers around 16°C (60°F), bringing a blend of comfortable warmth and refreshing coolness. However, be prepared for a minimum of 1°C (34°F) on cooler days and a pleasant maximum of 31°C (88°F) at the peak of warmth. Expect to see 97 mm (3.8 in) of precipitation spread over 11 days, contributing to a humidity level of 81% that adds to the moist and invigorating atmosphere.
In April in Portsmouth, the average temperature is 16°C (60°F). Maximums can reach 31°C (88°F), and minimums can be as low as 1°C (34°F). Be prepared for a range of weather conditions and pack accordingly for your travels!
In Portsmouth in April, the total precipitation amount is 97 mm (3.8 in) over the course of 11 days.
In Portsmouth in April, humidity is 81%. With an average temperature of 16°C (60°F), this humidity feels like a warm, heavy blanket wrapping around you as you travel, making you acutely aware of the sweat on your skin and creating an atmosphere that might dampen your spirits but also invites you to seek out refreshing beverages and shady spots.
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 | 6°C (43°F) | 90 mm (3.5 inches) | 84% | moderate |
| February Weather | 8°C (47°F) | 99 mm (3.9 inches) | 83% | high |
| March Weather | 10°C (51°F) | 79 mm (3.1 inches) | 82% | very high |
| April Weather | 16°C (60°F) | 97 mm (3.8 inches) | 81% | very high |
| May Weather | 20°C (69°F) | 121 mm (4.7 inches) | 80% | very high |
| June Weather | 24°C (76°F) | 121 mm (4.8 inches) | 82% | very high |
| July Weather | 27°C (81°F) | 142 mm (5.6 inches) | 81% | extreme |
| August Weather | 26°C (79°F) | 169 mm (6.6 inches) | 81% | very high |
| September Weather | 24°C (75°F) | 127 mm (5.0 inches) | 78% | very high |
| October Weather | 19°C (66°F) | 91 mm (3.6 inches) | 80% | very high |
| November Weather | 11°C (53°F) | 78 mm (3.1 inches) | 84% | moderate |
| December Weather | 8°C (47°F) | 89 mm (3.5 inches) | 84% | moderate |