Home › Weather › Towns › Portsmouth
Live forecasts update automatically; written guidance last reviewed 13 June 2026 by the Insight Britain weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The live forecast above gives you the current conditions for Portsmouth, updated automatically. You can use it alongside this guide to plan your day, from the city’s coastal microclimate to its seasonal quirks.
How should I read the live forecast for Portsmouth?
The live forecast above shows temperature, wind speed and direction, humidity, and precipitation probability for the next few hours. For Portsmouth, pay close attention to the wind reading: the city’s exposed position on Portsea Island means a moderate breeze in the forecast can feel much stronger along the seafront and harbour. Check the rain icon carefully, as showers can arrive quickly from the Solent.
What is Portsmouth’s typical climate like throughout the year?
Portsmouth has a temperate maritime climate, milder than much of inland southern England. Winters (December to February) see daytime highs in the low double figures Celsius, with overnight lows rarely below freezing, thanks to the warming influence of the English Channel. Rainfall is spread across the year, but autumn and winter tend to be wettest, with frequent brisk south-westerly winds. Summers (June to August) are warm rather than hot, with daytime temperatures typically in the high teens to low twenties Celsius; prolonged heatwaves are uncommon due to the sea breeze. Spring and autumn are changeable, mixing calm sunny spells with blustery, showery weather.
How does local geography affect Portsmouth’s weather?
Portsmouth’s position on Portsea Island, surrounded by the Solent and Langstone Harbour, creates a distinct coastal microclimate. The sea moderates temperature extremes, so frosts and snow are rare. However, the flat, exposed terrain allows wind to funnel through the city, particularly along Southsea seafront and the harbour entrance. The South Downs inland can block some weather systems, occasionally leaving Portsmouth drier than nearby areas such as Waterlooville or Fareham, which sit in a rain shadow.
When is the best time to visit, and what should I pack?
Late spring (May and June) and early autumn (September) offer the most reliable weather for visiting, with a balance of mild temperatures, longer daylight, and fewer rainy days. Pack layers at any time: a waterproof jacket and a windproof top are essential year-round. In summer, add a light jumper for breezy evenings; in winter, bring a warm, wind-resistant coat and waterproof footwear. Sunscreen is worth packing for bright days, even outside summer, as the reflective sea can intensify UV.
What are the nearest places with distinct weather patterns?
If you are checking conditions for the wider area, the weather can vary noticeably over short distances. Gosport on the western side of the harbour is often a degree cooler with a stronger sea breeze. Hayling Island to the east is very exposed to the Solent. Inland towns like Havant and Wallington can be marginally warmer and less windy, but more prone to overnight frosts in winter.
What will the weather be like in Portsmouth tomorrow?
The live forecast above provides a detailed 24-hour breakdown for tomorrow. For a general outlook, Portsmouth’s coastal position often means the morning starts cloudy or misty, followed by afternoon clearing. We recommend checking the 10-day forecast for a fuller picture of the week ahead.
Can I trust the 10–14 day outlook for Portsmouth?
Long-range forecasts for Portsmouth are broadly reliable for trends, such as prevailing wind direction or the chance of low pressure, but day-by-day accuracy drops beyond a week. Use the UK weather hub for updates, and treat precise rain timings and temperatures as indicative beyond 7–10 days.
Does it rain a lot in Portsmouth?
Portsmouth is one of the drier cities in the UK, with average annual rainfall around 650–700 mm — less than London and far less than Manchester. Rain is often light and frequent rather than heavy, falling on roughly 100–110 days per year. For the latest alerts, see UK weather warnings.
Is the forecast different for Southsea seafront?
Yes, Southsea seafront can be 2–4°C cooler than the city centre in summer due to the onshore breeze, and noticeably windier year-round. The live forecast above covers the broader Portsmouth area, so adjust expectations for a fresher, breezier feel directly on the coast.