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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Norwich Wire weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Portsmouth’s live forecast above shows a high of 12°C and a low of 7°C today, with moderate south-westerly winds and a 40% chance of rain by late afternoon. That means a mild but damp start to the week for the city.
What is the weather in Portsmouth tomorrow?
Tomorrow the mercury will reach 11°C and drop to 6°C, with a 60% chance of light rain during the morning. Winds will ease slightly, making for a cooler, mainly overcast day.
How does the 10-day and 14-day outlook look?
The weather in Portsmouth 10 days ahead shows a gradual drying trend from Wednesday, with highs around 13°C and longer sunny spells. The weather in Portsmouth 14 day forecast keeps temperatures near average for late April, though a low-pressure system may bring unsettled conditions early next week. For a longer view, the Portsmouth weather 30 days outlook (updated daily) suggests above-average pressure building later in the month, reducing rainfall totals.
Will it rain in Portsmouth this weekend?
According to the Met Office weather Portsmouth data, Saturday is likely dry with sunny intervals, but Sunday could see a band of rain moving in from the west. Check the live forecast above for updates.
Where can I check the Portsmouth weather BBC forecast?
The Portsmouth weather BBC page offers a rolling 3-hourly breakdown; however for the most authoritative information, the Met Office provides the official UK data used by all emergency services.
Is there a reliable 15-day and 30-day forecast for Portsmouth?
The Portsmouth weather 15 days and 30-day outlooks are experimental and change daily. The Met Office issues a 10-day deterministic forecast; longer ranges show trends, not precise conditions. Use the 10 Day Weather Forecast UK page for a balanced view.
For other cities, see our UK weather hub or check the Liverpool Weather page. If you’re planning a trip north, the Glasgow Weather page shows a cooler trend this week.