Portsmouth weather conditions will remain cold and dry through the coming days, with overnight frost expected and temperatures dropping as low as -4°C tonight. Clear spells will develop across the city this evening, with light winds of around 7mph and minimal precipitation expected.
Tonight’s Conditions
The Portsmouth weather forecast shows temperatures falling to between 1°C and 2°C overnight, with clear skies developing after evening cloud breaks. Residents should prepare for widespread frost formation, particularly in southwestern areas where clearer conditions are most likely. Patches of mist and fog may form during the early hours of Wednesday morning.
Wind speeds will remain light at approximately 4-6mph throughout the night, with humidity levels ranging between 76% and 90%. Visibility is expected to remain good at 13-17km, though localised fog patches could reduce this temporarily.
Wednesday Outlook
Portsmouth weather on New Year’s Eve will see any stubborn morning fog clearing by midday to reveal sunny but cold conditions. Daytime temperatures will reach a maximum of 5°C, with the thermometer climbing gradually from 1°C in the early morning. Light winds of around 4mph will persist throughout the day, making it feel slightly colder than actual temperatures suggest.
The “feels like” temperature will hover around 0-1°C due to wind chill effects. Rainfall probability remains below 5% throughout the day, ensuring dry conditions for any outdoor activities or New Year’s Eve preparations.
Extended Forecast
Thursday’s Portsmouth weather will bring variable cloud cover with temperatures reaching 7°C during the day and dropping to 1°C overnight. New Year’s Day conditions will start cloudy with a small chance of isolated rain spots, though skies should clear southward by afternoon.
Friday presents the greatest weather uncertainty, with a risk of sleet or snow showers between late morning and early afternoon. Temperatures will reach 5°C before plummeting to -2°C overnight, marking one of the coldest nights of the week.
The weekend will see temperatures continuing to fall, with Saturday’s Portsmouth weather bringing a high of just 3°C and an overnight low of -3°C. Sunday will remain similarly cold at 4°C during the day and -3°C at night. Despite the cold, both days are expected to remain dry with bright conditions.
Weather Details
Daily wind gusts will reach up to 19mph, though sustained winds will remain lighter at 4-7mph throughout most periods. UV levels will stay low, though residents spending extended time outdoors should still consider sun protection during daylight hours.
Air pollution levels across Portsmouth will remain low, allowing for normal outdoor activities without health concerns. The sun will rise at 08:07 and set at 16:07 on Tuesday, providing limited daylight hours typical for this time of year.
Coastal areas may experience fresher winds at times, particularly from Thursday onwards, making conditions feel notably colder for those near the seafront. Residents are advised to dress warmly and take precautions against icy conditions, especially during morning and evening hours when frost is most prevalent.
