The journey was convenient, the meeting point was easy to find, communication with the tour leader was easy, and they spoke excellent English. All the tourist spots were covered, and the itinerary wasn't too packed.
A vibrant journey amidst blooming flowers, moss phlox, and wisteria; a superior transportation system with excellent connectivity.
Anonymous User
Business traveler
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
6/25
Thursday
Heavy rain
20.2°C/19.2°C
6/26
Friday
Heavy rain
21.9°C/19.3°C
6/27
Saturday
Moderate rain
25.9°C/18.6°C
6/28
Sunday
Sunny
29.4°C/16.8°C
6/29
Monday
Patchy rain nearby
28.4°C/18.1°C
6/30
Tuesday
Partly Cloudy
27.1°C/20.3°C
7/1
Wednesday
Patchy rain nearby
23.1°C/19°C
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