What to Wear in 70°F (21°C) Weather: Observed on 39,000 People in London

Our guide: what to wear at 70°F (21°C)

This is our guide, not a measurement.

At 70°F (21°C), short sleeves are enough. T-shirts, light shirts, dresses, skirts and light trousers or shorts are all comfortable, and you do not need a jacket in the sun. Keep one thin layer for air-conditioned offices and shops or a cooler evening. Breathable fabrics such as cotton and linen feel better than synthetics if you will walk a lot. London buses and the Tube can feel warm at this temperature, so lighter is better.

From 29 September to 4 October 2026, London street cameras counted 39,673 people at 66°F (19°C) to under 73°F (23°C) across 104 sweeps.

On the 104 London street-camera sweeps from 29 September to 4 October 2026, the air felt like 19.4°C (66.9°F) on average (Met Office).

It was raining during 8 of the 104 London street-camera sweeps from 29 September to 4 October 2026 (Met Office).

From 29 September to 4 October 2026, London street cameras took 104 sweeps between 07:00 and 19:59 London time.

London street cameras observed 39,673 people at 66°F (19°C) to under 73°F (23°C) between 2026-09-29 and 2026-10-04.

Observed at 66°F (19°C) to under 73°F (23°C)

Coat or jacket: 37 people checked by hand in 2 spot checks so far. A percentage appears once 200 people from 10 spot checks on 5 days have been checked.

Bare legs (shorts or skirt): 61 people checked by hand in 2 spot checks so far. A percentage appears once 200 people from 10 spot checks on 5 days have been checked.

Source: Transport for London JamCam images, near-field people detected by The Wear Report; weather: Met Office