Portsmouth is experiencing light showers this Monday, 18 May 2026, with temperatures sitting at 12°C and a feels-like temperature of 10°C, according to the Met Office. Gusts of up to 26mph from the south-west are adding a noticeable chill to the air.
Rain chances stand at 95% or higher through the early afternoon, with light showers expected to persist into the evening hours. Humidity is elevated, reaching a daily high of 84%, whilst visibility remains moderate to very good — ranging between 7km and 25km across the day. UV levels are classed as moderate, with sun protection advised during midday. Air pollution and pollen levels are both low, making outdoor activity broadly safe for most residents.
Conditions will deteriorate overnight as a band of rain sweeps eastwards from the west, driven by strengthening south-westerly winds. The rainfall is expected to be steady, persistent, and at times heavy, before beginning to ease towards dawn. Tuesday will start cloudy and breezy, with early rain clearing to the east by mid-morning. Scattered, heavy showers are then forecast to develop through the afternoon, with a maximum temperature of 16–17°C.
Wednesday brings continued breezy conditions with a mix of sunny spells and isolated showers. Thursday turns calmer and gradually warmer as the day progresses, with only the odd shower possible. Friday promises to be the standout day of the week — dry, sunny, and warm, with temperatures potentially reaching the low-to-mid twenties.
The improving trend continues into the weekend. Saturday and Sunday are expected to bring largely dry conditions, with highs climbing to 22–24°C by Sunday. Light, gentle breezes from the south will make for pleasant late-May weather across Portsmouth and the wider Hampshire coast.
Day | High | Low |
|---|---|---|
Monday 18 May | 14°C | 11°C |
Tuesday 19 May | 17°C | 12°C |
Wednesday 20 May | 18°C | 12°C |
Thursday 21 May | 20°C | 13°C |
Friday 22 May | 23°C | 13°C |
Saturday 23 May | 23°C | 12°C |
Sunday 24 May | 24°C | 12°C |
