Last updated: June 24, 2025
In January, the average temperature in West Portsmouth, United States hovers around 2°C (35°F). Be prepared for a chilly range, where temperatures can dip as low as -19°C (-2°F) and occasionally rise to a warm 22°C (71°F). During this month, you can expect 85 mm (3.3 in) of precipitation over approximately 9 days, contributing to a high average humidity of 88%.
In January in West Portsmouth, the average temperature is 2°C (35°F), with maximums reaching 22°C (71°F) and minimums dropping as low as -19°C (-2°F). Be prepared for a wide range of temperatures when traveling to West Portsmouth during this month.
In West Portsmouth in January, the precipitation amount is 85 mm (3.3 in) over the course of 9 days.
In West Portsmouth in January, humidity is 88%. With an average temperature of 2°C (35°F), this humidity feels like you're wrapped in a cold, damp blanket, making outdoor activities uncomfortable and travel challenging due to the chill seeping into your bones.
In West Portsmouth in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in West Portsmouth, you can check the information here.
UV Risk Categories
Weather in West Portsmouth varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in West 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 |