What to pack for London in September

UV index of 4.5 bounces off wet pavement and water.

Check ankles and, if there's a dog, paws and ears every night.

Urban crowds and transit mean cuts and minor injuries happen fast.

This country runs on Type G. Get one with USB-C so you're not fighting over the single outlet.

Daylight lasts 12.7 hours; devices drain faster in cool weather.

Set it up before you land. Signal drops for long stretches outside cities.

Overhead bins fill fast on domestic flights within the UK.

Parks near London need a separate bag from your main pack.

Fits the overhead on every airline that matters. Skip the checked-bag line entirely.

For the passport, the chargers, and the one dry pair of socks.

One brick charges the laptop, phone, and camera.

Hotel and cafe wifi is shared with everyone else in the building. A VPN keeps your banking and email to yourself.

International travel and busy terminals make bags easy to lose.

Humidity at 77 percent makes clothes smell fast between washes.

Constant urban noise makes quiet sleep on planes necessary.

Eleven rain days mean the sun feels sharper when it breaks through cloud.

Tap water is safe, but hands touch a thousand surfaces daily.

Power outlets in hotels and cafes are far apart.

Airports and border checks happen multiple times on a UK trip.

Luggage locks matter at hostels and shared accommodations.

Shared bathrooms in budget hotels need a hanging bag.

Trains and buses run all night; sleep happens in transit.