We attended the Mt. Omuro and Atami fireworks displays on July 20th. It was the last day of Japan's three-day weekend, and we expected huge crowds and traffic jams. Thankfully, the day went smoothly, and everything went as planned! Many thanks to our experienced guide, Serina, who provided helpful tips that saved us unnecessary time! The Mt. Omuro cable car ride is definitely worth it; it only takes 5-8 minutes from the foot of the mountain to the summit—very short, but the air was filled with the refreshing scent of grass! For the Atami fireworks, Serina pointed out the best viewing spots. The sea breeze was refreshing, and seeing the magnificent fireworks up close was incredibly beautiful and breathtaking! Although it wasn't perfect due to traffic and the intense heat, thankfully the tour bus had good air conditioning! I highly recommend this tour!
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 50–66°F, 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 74–85°F, 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 66–80°F, comfortable and pleasant climate, rainfall gradually decreasing. Common activities: Maple viewing, mountain hiking. Recommended clothing: Light jacket, long-sleeved shirt.
Winter (December–February): Average 41–44°F, cold and dry, low rainfall. Common activities: Skiing, onsen experience. Recommended clothing: Warm jacket, beanie, gloves, scarf.
Koshinetsu climatological average
Annual average temperature: approx. 62.6°F / Annual rainfall: approx. 1656 mm / Summer humidity: 70%–80% / Rainiest month: August
Koshinetsu monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
41.2°F
47.4
February
43°F
72.5
March
50.9°F
131.3
April
61.5°F
182.2
May
66.7°F
199.8
June
74.7°F
248.8
July
84°F
176
August
85.1°F
254.7
September
80.8°F
127.3
October
66.4°F
105.2
November
57°F
91.9
December
45°F
19.2
Koshinetsu weather for the next seven days
8/12
Wednesday
Patchy rain nearby
79.4°F/74.4°F
8/13
Thursday
Patchy rain nearby
87.6°F/73.4°F
8/14
Friday
Sunny
92.9°F/71.9°F
8/15
Saturday
Partly Cloudy
91.6°F/74.4°F
8/16
Sunday
Patchy rain nearby
92.9°F/74.5°F
8/17
Monday
Patchy rain nearby
90.1°F/75.7°F
8/18
Tuesday
Partly Cloudy
93.9°F/76.8°F
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