What to wear running at 25 °C

Updated: September 2026

Collage of the recommended running kit at 25 °C, with specific clothing and accessory models

Short answer

Running at 25 °C, your body feels like about 30 °C, so dress as if it were 30 °C.

Rule of thumb: running makes you feel 5-8 °C warmer than the thermometer says. Dress for how you will feel once moving, not for the air temperature.

Running at 25 °C (77 °F): light, ventilated and sun-protected

At 25 °C the challenge shifts from cold to heat: clothing must wick sweat and let air through. A very light technical tee or singlet and shorts with an inner brief are the base, and light colours reflect the sun better.

Sun protection is no longer optional: a ventilated cap or visor, sunglasses and sweat-resistant sunscreen on face, neck and shoulders. If you run in the afternoon on tarmac, the ground gives back heat and it feels hotter than the thermometer says.

Adjust your pace: at 25 °C heart rate rises sooner than in the cold. Carry water, alternate shaded sections and do not leave hydration for the end; on long runs, add salts or electrolyte gels.

Recommended kit, item by item

Head and neck

Breathable cap or visor for the sun; nothing that insulates.

Torso

Breathable technical short-sleeve tee, or a singlet when it gets really hot. Avoid cotton: it holds sweat.

Legs

Technical shorts. Test them before a long run to rule out chafing.

Hands

No gloves needed.

Feet

Technical socks without thick seams: they dry fast and prevent blisters.

Sun

Heat and direct sun: UV-filter sunglasses and a sweat-resistant sunscreen. The most forgotten item, and the one that hurts most after kilometre 10.

Adjust to your case: calculator with wind, rain, pace and duration →Change the temperature and conditions and the kit updates instantly.

Frequently asked questions

Which shirt should I wear to run at 25 °C?

A light technical one in light colours, with a mesh panel on the back. A singlet helps if you sweat a lot and run without a pack.

Do I need a cap at 25 °C?

Yes, especially if you run between 11 am and 5 pm. A ventilated cap or visor protects your head and helps against too much sun.

How much water should I carry at 25 °C?

As a guide, half a litre per hour of effort, adjusted to how much you sweat. On routes without fountains, carry a bottle or a hydration vest.