Weather in Japan in september
Country-wide climate normals across 64 cities in Japan.
How Hot Is Japan in september?
Japan's September is consistently warm — typical 27°C, with no major regional outliers.
Sunshine in Japan in september
Limited sunshine and short daylight define Japan's September: Tokyo averages just 2.5h of direct sun, with the sun up between 5:25 am and 5:45 pm. The grey, overcast pattern is consistent across most of the country, with little regional variation in cloud cover.
Does It Rain In Japan In september?
Heavy seasonal rains saturate Japan in September — Tokyo averages 242mm of rain across 15 days, with downpours an almost daily feature. The pattern is consistent across most regions, particularly along monsoon-affected coasts. Expect torrential afternoon storms followed by humid heat.
Is Japan Humid In september?
Mugginess defines Japan's September: humidity averages 75% in Tokyo, and the air feels noticeably heavy across most regions. Sweat sits on the skin longer than it would in drier conditions, and overnight relief is limited. Pack light, breathable fabrics.
Wind In Japan In september
Light breezes are typical across Japan in September: 16 kph in Tokyo, with similar gentle wind conditions in most regions. The air moves enough to keep things fresh on warm days but not enough to be disruptive. Coastal cities may see slightly more.
Cloud Cover In Japan In september
Cloudy skies dominate Japan in September — 69% cover in Tokyo, with similar overcast conditions in most regions. Direct sun is patchy and broken; expect grey stretches between brief bright moments. Coastal areas may be heavier than inland.