Residents in Southampton can expect a week of sharp temperature differences, with mild daytime highs set to contrast against unseasonably cold overnight conditions. According to the Met Office, daytime temperatures will reach between 14°C and 17°C throughout the week of 11-17 May 2026.
Tuesday, 12 May, is expected to be the best day for outdoor activities, featuring mostly sunny weather and a weekly high of 17°C. While the daytime will be pleasant, the national weather service warns that clear skies and light winds overnight will lead to a significant drop in temperatures. Nighttime lows are expected to reach between 3°C and 8°C, with Monday night feeling particularly cold at a feels-like temperature of 3°C.
Due to the risk of frost, the Met Office has advised that gardeners should take protective measures for their outdoor plants. Ground frost is more common than air frost during this time of year because the soil has not yet built up enough stored warmth from the spring sun. Residents should ensure delicate plants are covered or moved to a sheltered area to prevent damage.
Following the sunny start to the week, the weather will become more unsettled. Wednesday and Thursday are expected to bring light showers, with the chance of rain reaching 60-80% at times. Wednesday will also be the windiest day of the week, with gusts predicted to reach 36mph. Throughout the week, residents should be aware that UV levels will be moderate to high from Tuesday through Thursday, and sunscreen is recommended during the middle of the day.
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