Can Hot Weather Make Depression Worse? Signs, Causes, and Tips

MiBlue Daily

July 7, 2026

Hot weather can worsen depression symptoms in some individuals. Heat can affect sleep, increase irritability, trigger anxiety, and may increase heat sensitivity among people taking certain antidepressants. Summer seasonal affective disorder (SAD) can also contribute to depression symptoms during warmer months.

Think about the way you feel after working outside on a hot day: sweaty, tired, and sluggish. The heat makes you feel physically uncomfortable. Physical discomfort can cause a shortened temper and higher level of irritability and aggression.

During the winter months, some individuals will feel increased symptoms of depression due to the lack of sunlight. SAD in the summer is less common, and has the opposite effect.

Too much sunlight, heat and allergens can cause hypomanic or agitated depressive episodes. Those affected by SAD are more likely to stay indoors and remove themselves from activities. SAD can feel extremely isolating, as many summer social activities are outdoors. 

Symptoms of summer SAD can include:

• Insomnia
• Poor appetite and weight loss
• Agitation or anxiety
• Increased irritability
• Losing interest in activities you once enjoyed
• Feeling hopeless, worthless or guilty

Contact a behavioral health care provider if you feel any of these symptoms for two weeks or longer.

In the summer, days are longer with increased sunlight. Many individuals’ circadian rhythm might be influenced by the change in sunlight. Our bodies release melatonin when the sun goes down, as our signal to go to sleep. When the sun rises earlier, and sets later, those who rise and fall with the sun might be at risk for insomnia and other sleeping issues.