The Tokai region is preparing for a sharp increase in temperatures starting this weekend, bringing heat levels typically seen in late June and July. Residents are urged to take precautions against heatstroke as the region transitions into an unusually warm period.
Weekend Temperature Surge
High pressure is expected to cover the Honshu region on May 16 and 17, resulting in clear skies and strong sunlight. With dry air in place, there is particularly little concern for rain, making it an ideal window for outdoor activities, provided residents manage the sudden heat.

On Saturday, May 16, maximum temperatures are forecast to reach 29°C in Nagoya and Gifu, while Tsu and Shizuoka are expected to see 25°C. Inland areas may approach 30°C, reflecting conditions usually observed in late June.
The heat will intensify on Sunday, May 17. Nagoya and Gifu are projected to hit 32°C, while Tsu may reach 29°C and Shizuoka 28°C. Many areas across Aichi, Gifu, and Mie prefectures are likely to experience July-like heat.
Health Risks and Precautions
The rapid rise in temperature significantly increases the risk of heatstroke. In recent years, there has been a trend of increased emergency transportations due to heatstroke during May, particularly on days when temperatures hover around 30°C or spike suddenly from the previous day.
For those active outdoors today, May 15, where highs are around 25°C, the use of hats, parasols, and sunscreen is recommended due to strong UV rays. Frequent hydration and breaks are essential during intense exercise or outdoor work.
Long-Term Outlook
The warm trend is expected to persist through Tuesday, May 19. Nagoya, Gifu, and Tajimi are forecast to experience consecutive midsummer days with temperatures exceeding 30°C.
A weather shift is anticipated starting Wednesday, May 20, as the rainy season front moves north and settles over Honshu. This transition could bring a risk of heavy rain toward the latter half of next week, prompting early preparations for potential flooding or storms.
Frequently Asked Questions
Which cities are expected to see the highest temperatures this weekend?
Nagoya and Gifu are forecast to be the warmest, reaching 29°C on Saturday and 32°C on Sunday.
Why is the heat this weekend particularly dangerous?
Sudden temperature spikes in May are associated with an increase in emergency heatstroke transportations because the body may not be adjusted to the heat.
What is the weather forecast for the following week?
While heat continues until May 19, the rainy season front is expected to move north starting May 20, which may lead to heavy rain by the end of the week.
How are you adjusting your weekend plans to handle the sudden spike in temperature?
