[Japan Meteorological Agency 1-month forecast] The temperature in mid-May changes to high The heat approaching 30 ℃ next week
On Thursday, May 7, the Japan Meteorological Agency announced a one-month forecast for May 9 to June 8.
The temperature forecast for the middle of May will change higher, and there will be days approaching 30 ° C in the west of Kanto. It is necessary to take measures against heat stroke.
Pinpoint 2 Week Weather Forecast
Pacific High Pressure Expands Near Japan
From the middle of next week, the Pacific high pressure will strengthen and extend to the south of Japan.
Strong westerly winds and westerly winds will flow more northward than in a normal year, and warm air will be more likely to cover the area around Japan.
The average monthly temperature is expected to be warmer than normal in western and northern Japan, and normal or higher than normal in Okinawa and Amami.
Next week, the temperature will be well above average.
Northern and eastern Japan will experience a much higher-than-normal condition in mid-May, according to the forecast for an annual temperature difference of 1500 m above sea level.
Even in the two-week weather announced by Weather News, from the middle of next week, there will be many summer days of 25 ℃ or more in western Japan, Tokai and Kanto, and it is expected to be hot approaching 30 ℃ in the second half.
Early weather information on high temperatures was released from Kyushu to Tohoku, with the possibility of much higher than normal temperatures.
It is summer even on the calendar after the start of summer, and the number of hot days increases more than ever. Please take measures against heat stroke firmly on sunny days when the temperature rises.
Heat Stroke Information Heat Index (WBGT)
The baiu front has been active since late May.
Around mid-May, when the anticyclone overhangs, the Baiu front, which is stagnant in the south of Japan, is expected to weaken.
After the end of May, the Baiu front will be active again, and Okinawa and Amami will have more cloudy and rainy days.
As with the usual rainy season, be careful of heavy rain.
Wet air tends to flow into the Pacific Ocean side of western Japan, and there is a possibility of rainy season at this timing.
Monthly precipitation is expected to be normal in other areas.
Long-term forecast Weather outlook for the next three months
Source: Weather News 2026-05-07 14: 28
私も毎年5月中旬からの気温変化には敏感になっています。今年は特に、気象庁の1か月予報で示された通り、太平洋高気圧の勢力強化で日本列島が暖かな空気に覆われる日が増えそうです。私の住む関東では、すでに日中の気温が25℃を超える「夏日」が続き、外出時には帽子や日傘、こまめな水分補給が欠かせません。 また、熱中症指数（WBGT）を天気情報とあわせてチェックする習慣を持つことが重要だと感じます。今年の5月中旬からの気温急上昇は例年より早く、体がまだ暑さに慣れていないため、知らず知らずのうちに体調を崩しやすいです。私自身も数年前に熱中症の初期症状を経験してからは、気温が25℃を超える日には特に注意しています。 5月下旬からは梅雨前線の活動も活発化し、沖縄や奄美地方を中心に雨が続く傾向です。西日本太平洋側には梅雨入りの兆しも出てくるため、天気の変化に敏感に反応し、洗濯や外出の計画を立てることが快適に過ごすコツです。私の場合、天気アプリで最新予報をこまめに確認し、雨具の準備や室内の湿度管理を徹底しています。 この時期の気温の変動と梅雨入りの前兆は、健康管理だけでなく日常生活にも大きな影響を与えるので、最新の気象情報を常に把握することが欠かせませ ん。気象庁やウェザーニュースの発表を参考に、熱中症対策や雨による災害への備えを早めに始めることを強くおすすめします。
