Extreme heat and increased humidity impact summer in the USA

• July 2025 set a record for humidity levels in many states across the USA.
• High humidity levels increase the risk of heat-related illnesses.
• A decrease in temperatures is expected at the beginning of September, but with possible spikes.

Summer 2025 in the USA has seen extraordinarily high humidity. According to data from Oregon State University, many states recorded record-high humidity levels in July. The situation has been particularly challenging for residents of the Pacific Northwest, Northeast, and areas of the Mid-Atlantic.

The heat index, which accounts for temperature and humidity, surpassed 100 degrees Fahrenheit in states such as Ohio, Illinois, Kentucky, Tennessee, and Florida. In cities like Washington, D.C., Columbia County, Pittsburgh, and Roanoke, July became the hottest month in recorded history.

Particularly concerning was the situation in Paducah, Kentucky, where the highest humidity levels were recorded in the last 75 years. The local office of the National Weather Service reported that the number of hours with high humidity exceeded the norm by 300% for this month.

The consequences of climate change are creating such heat and humidity conditions. High humidity levels increase the risk of heat-related illnesses, especially for children, the elderly, and individuals with pre-existing medical conditions. Research shows that prolonged exposure to high temperatures and humidity worsens the body’s ability to cool itself through perspiration.

At the beginning of September, meteorologists predict a decrease in temperatures in some regions, due to high atmospheric pressure bringing cooler air from Canada. However, this decrease may be accompanied by increased storm activity and unpredictable weather patterns.

This year has already seen over 3000 severe weather warnings issued, which is a record. In July, catastrophic flooding in central Texas led to the deaths of at least 120 people.

Tags: USA/Weather