This post may contain affiliate links. If you purchase through them, I may earn a small commission at no extra cost to you. Thanks for supporting our small business.
Atami sits on the northeast corner of the Izu Peninsula, facing Sagami Bay, where the warm Kuroshio Current keeps winters milder than inland Shizuoka. The city’s annual mean temperature is 16.3°C (61.3°F) and it receives 2,012.7mm of rain a year, with a September peak. Use this Atami travel guide page’s month-by-month breakdown alongside our best time to visit Atami guide to plan around the wet season.
Atami Weather by Month: Winter (December to February)
January is Atami’s coldest month with a daily mean of 7.0°C (44.6°F), an average high of 10.7°C (51.3°F) and a low of 3.9°C (39.0°F). Rainfall drops to 76.1mm in January and 66.3mm in December, the two driest months of the year. Snow is rare, about 1cm in an average February, so the city stays open for sightseeing while ski resorts in the mountains behind it fill up, and the events and festivals in Atami calendar keeps running through winter.
Atami Weather by Month: Spring (March to May)
Spring warms quickly: March averages 10.1°C (50.2°F) and May reaches 18.5°C (65.3°F) with highs around 22.7°C (72.9°F). Rainfall climbs to 158.0mm in March and 172.6mm in May. May averages 184.1 sunshine hours, the sunniest spring month, which makes it reliable for walking the coastline and seeing the sights in our things to do in Atami guide before the June rain arrives.
Atami Weather by Month: Summer (June to August)
Summer is hot and humid. August is the warmest month with a daily mean of 26.4°C (79.5°F), a high of 30.2°C (86.4°F) and a low of 23.8°C (74.8°F). June is the start of the rainy season with 251.5mm of rain over 12.4 wet days and only 127.7 sunshine hours, the dullest month. Sea temperatures off Sun Beach run about 24°C to 26°C (75°F to 79°F) from July to September, warm enough for swimming, and the beachfront hotels in our where to stay in Atami guide sit closest to it.
Atami Weather by Month: Autumn (September to November)
September is Atami’s wettest month at 263.9mm across 12.1 wet days, partly from typhoon season. By October the mean drops to 18.7°C (65.7°F) and November to 14.0°C (57.2°F). October and November bring 126.0 and 128.5 sunshine hours, so pack a light jacket and an umbrella. Humidity eases from 78% in September to 69% in November, and the Atami neighborhoods guide covers where to base yourself in each district.
Atami Weather by Month: The Full Data Table
All figures below are 1991 to 2020 normals from the Japan Meteorological Agency station at Ajiro, just south of the city centre, and our Atami travel tips page covers what to pack for each season.
| Month | Avg High | Avg Low | Rain (mm) | Sun (hrs) |
|---|---|---|---|---|
| January | 10.7°C (51.3°F) | 3.9°C (39.0°F) | 76.1 | 147.4 |
| February | 11.3°C (52.3°F) | 4.0°C (39.2°F) | 82.0 | 142.8 |
| March | 14.2°C (57.6°F) | 6.6°C (43.9°F) | 158.0 | 158.2 |
| April | 18.8°C (65.8°F) | 10.9°C (51.6°F) | 168.1 | 176.4 |
| May | 22.7°C (72.9°F) | 15.3°C (59.5°F) | 172.6 | 184.1 |
| June | 25.0°C (77.0°F) | 18.8°C (65.8°F) | 251.5 | 127.7 |
| July | 28.9°C (84.0°F) | 22.6°C (72.7°F) | 242.5 | 161.8 |
| August | 30.2°C (86.4°F) | 23.8°C (74.8°F) | 186.0 | 194.1 |
| September | 26.7°C (80.1°F) | 20.9°C (69.6°F) | 263.9 | 136.9 |
| October | 21.8°C (71.2°F) | 16.1°C (61.0°F) | 237.3 | 126.0 |
| November | 17.2°C (63.0°F) | 11.3°C (52.3°F) | 108.4 | 128.5 |
| December | 12.9°C (55.2°F) | 6.6°C (43.9°F) | 66.3 | 142.8 |
