Weather in UK in September
Country-wide climate normals across 26 cities in UK.
How Hot Is UK in September?
Mild conditions are universal across UK in September: highs near 18°C in London, similar elsewhere.
Sunshine in UK in September
Dark, overcast days dominate UK in September — London sees just 2.6h of sun a day, and the pattern is similar across most regions. Cloud cover is heavy and persistent, with even the brighter regions struggling to escape the gloom for long.
Does It Rain In UK In September?
Typical September rainfall covers UK: about 82mm in London across 12 days, with wetter conditions in coastal regions and drier conditions inland. Expect showers about half the days, but extended dry stretches between them. The pattern is variable but predictable.
Is UK Humid In September?
UK is enveloped in tropical-thick humidity through September: London averages 78%, and most of the country tracks similarly. The constant moisture makes warm temperatures feel substantially hotter, and even nights bring limited cooling. Light cotton clothing is essential.
Wind In UK In September
Persistent breeze shapes UK's September: 21 kph in London, with consistent wind across the country. The conditions are ideal for sailing and other wind sports, but can be disruptive for fine outdoor work.
Cloud Cover In UK In September
Cloudy skies dominate UK in September — 69% cover in London, with similar overcast conditions in most regions. Direct sun is patchy and broken; expect grey stretches between brief bright moments. Coastal areas may be heavier than inland.