Although it is hard to find something more enjoyable than a bike ride on these nice days, you must remember there are dangers when the temperatures get too high. Heat-related illness can come on suddenly and unexpectedly. For your own safety and to better understand heat-related illnesses please read this excellent article on Understanding Heat-related Illness.
How hot is it? The impact of heat on your body is a factor of a number of conditions including temperature and humidity. Weather forecasters have started using a term “heat index” to convey what the ‘real’ temperature is in terms of how it impacts us. Please understand heat index and consider it along with temperature and other factors before riding to know what to expect NOAA: What is Heat Index?.