Ibaraki Weather Forecast

A degree or two cooler and noticeably windier off the Pacific, with the same dry sunny winters and humid summers. The coast around Oarai keeps a sea breeze that makes August distinctly more bearable than inland Kanto.

Late April to mid-May. The nemophila bloom lines up with the clearest, driest stretch of the Kanto year, after the spring winds have dropped and before the tsuyu arrives in June.

It faces the Pacific, so yes — September and early October carry the highest risk. In practice that usually means a day of heavy rain and strong onshore wind rather than a direct hit, with coastal trains suspended as a precaution.