Japan may record its first extreme heat days of 2026 today as temperatures in two prefectures are expected to hit 35C [1].
This sudden spike in temperature during May creates a significant public health risk. Because these temperatures are unseasonable, many residents may not have implemented the cooling measures typically used during the summer months.
Forecasters expect Hita City in Oita Prefecture and Toyooka City in Hyogo Prefecture to reach a high of approximately 35C [1]. The heat is driven by an influx of warm air moving into the region [1, 2].
Early readings already indicate a rapid climb in temperature. In Hita City, the temperature was measured at 31.3C as of 11 a.m. [1]. The scale of the heatwave is widespread, with 43 locations already recording "midsummer day" temperatures [1]. Other reports indicate that more than 90 locations have observed maximum temperatures of 30C or higher [3].
Health officials and news agencies are urging the public to take immediate precautions. "Please be on alert for heatstroke," FNN said [2].
Experts recommend specific behavioral changes to mitigate risk during this period. "Ensure thorough hydration, take frequent breaks, and avoid strenuous exercise to maintain active heatstroke countermeasures," MSN Weather said [3].
The extreme heat is expected to persist through May 19 [1, 2]. However, the weather is projected to shift starting May 20, with cloud cover and rain potentially lowering maximum temperatures by approximately 10C [1].
“Japan may record its first extreme heat days of 2026 today”
The occurrence of 35C temperatures in mid-May is an anomaly that suggests an early onset of extreme weather patterns. This creates a dangerous gap in preparedness, as the general population and municipal infrastructure are typically not geared for extreme heat until June or July, increasing the likelihood of heat-related hospitalizations.
