On clear autumn days, high barometric pressure and bright skies can feel invigorating. Sunlight boosts serotonin, the brain’s “feel-good” chemical, while stable pressure keeps blood vessels and body fluids in balance. Many people notice sharper focus, steadier energy, and even reduced aches and pains in these conditions.

But when storms sweep in, the opposite can happen. Falling pressure causes fluids in the body to expand, sometimes straining joints or triggering headaches. Blood vessels may dilate, oxygen intake dips slightly, and even the inner ear reacts, leaving some people dizzy or fatigued.

Add in shorter daylight hours, which reduce serotonin and disrupt sleep cycles, and it’s clear why autumn weather can be energizing one day and draining the next.