Can hot weather cause the heart to beat faster?

Below 100 is not tachycardia, but simple heart rate acceleration. It's hot every day in summer, people sweat a lot, and their tissues are relatively short of water, so they need more blood support. In some cases, speeding up the heart rate can increase the unit output of blood, so this is normal, don't worry! If you feel unwell, you can try to rest in a cool place to avoid traveling in hot weather and prevent heatstroke. I wish you the best of health!