Merino wool is specifically recommended for exactly this reason. Everyone who does bike tours swears by it. Wicks sweat really quick, keeps you cool in hot weat

Merino wool is specifically recommended for exactly this reason. Everyone who does bike tours swears by it. Wicks sweat really quick, keeps you cool in hot weather, and is extremely resistant to collecting odors even after multiple days of exertion between washes. "There's no such thing as bad weather, just bad clothing" does have a limit if outside temps hit 35°C (95°F ish) (wet-bulb temp is more relevant but obviously varies by humidity) or higher but there's a lot you can do to mitigate the effects with the right materials.