Start with a Jam Ends with a Jam.
Guide was very good helpful and amazing
She tells everything and explain all!
Jam on a holiday so it took 3.5hr to go to mt fuji From tokyo.
reach the diversion on a 10 min boat ride instead of cable car which is good but too short.
head to oshino hakkai and look a beautiful small underground lake. amazing small view but too crowded and i spend 500 usd on souvenirs!
crazyly addicted
then went to mt fuji but 5h level was close so can only reach 4th level. cold till shaking and i love it!!!
snow ia still available on the floor.
last to lake and garden then realised its the car park with fuji view. lucky the clouds clear up at 4pm.
head back at 5 pm reached 8.30 pm with a massive jam.
not sure how but if its a holiday stick to the train!
Anonymous User
Family
Koshinetsu Weather, Climate and Best Time to Visit
Data source:Meteostat Update date:2025-09
Koshinetsu year round climate
Spring (March–May): Average 10.5–19.3°C, mild climate but with relatively high rainfall, especially abundant in April and May. Common activities: Spring outings, flower viewing. Recommended clothing: Light jacket, long-sleeved shirt, rain gear essential.
Summer (June–August): Average 23.7–29.5°C, hot and humid, frequent rainfall. Common activities: Sightseeing in summer resorts, water activities (such as river rafting, please pay attention to safety). Recommended clothing: Light and breathable clothing, sun hat, rain gear.
Autumn (September–November): Average 19.1–27.1°C, comfortable and pleasant climate, rainfall gradually decreasing. Common activities: Maple viewing, mountain hiking. Recommended clothing: Light jacket, long-sleeved shirt.
Winter (December–February): Average 5.1–7.2°C, cold and dry, low rainfall. Common activities: Skiing, onsen experience. Recommended clothing: Warm jacket, beanie, gloves, scarf.
Koshinetsu climatological average
Annual average temperature: approx. 17°C / Annual rainfall: approx. 1656 mm / Summer humidity: 70%–80% / Rainiest month: August
Koshinetsu monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
5.1°C
47.4
February
6.1°C
72.5
March
10.5°C
131.3
April
16.4°C
182.2
May
19.3°C
199.8
June
23.7°C
248.8
July
28.9°C
176
August
29.5°C
254.7
September
27.1°C
127.3
October
19.1°C
105.2
November
13.9°C
91.9
December
7.2°C
19.2
Koshinetsu weather for the next seven days
3/30
Monday
Partly Cloudy
21°C/11.2°C
3/31
Tuesday
Heavy rain
18.2°C/11.2°C
4/1
Wednesday
Patchy rain nearby
16°C/10.7°C
4/2
Thursday
Moderate rain
15.5°C/7.2°C
4/3
Friday
Sunny
18.4°C/5°C
4/4
Saturday
Patchy rain nearby
17.8°C/12.2°C
4/5
Sunday
Patchy rain nearby
18.9°C/10.7°C
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