Is This Summer Really Hotter? Osaka's 2024 vs. 2025 Heat Comparison

Does 2025 Feel Hotter Than 2024?

It is not just in your head. We compared Japan Meteorological Agency data for Osaka from July 1-27 in 2024 and 2025 to see how perception lines up with reality.

Daily Highs at a Glance

The red line (2025) climbs higher and stays there, especially after mid-July when 35-37 °C days became the norm.

Extreme Heat Nearly Doubled

• 2024: 6 extremely hot days (≥35 °C) -- about 22% of July.
• 2025: 13 extremely hot days -- almost every other day.

This is not a minor uptick in average temperature; it is a dramatic spike in dangerous extremes.

Nights and Humidity Made It Worse

In 2025 we also saw:

• More tropical nights that never dipped below 25 °C.
• Persistently high humidity, making sweat evaporate slowly.
• Urban heat-sink effects that kept the city warm past sunset.

The WBGT (heat index) repeatedly crossed official heatstroke alert thresholds, forcing schools and clubs to shorten practices.

Adjust Daily Habits Accordingly

Use the numbers to justify smarter routines:

• Plan outdoor exercise for dawn or late evening.
• Keep air conditioning running overnight for vulnerable family members.
• Monitor WBGT if you care for children, seniors, or outdoor workers.
• Stock hydration supplies before the next heat alert hits.

Bottom Line

Summer 2025 is objectively hotter--and more dangerous--than last year. Respect the heat, prioritize recovery, and let data guide your prevention plan.