Spring (March–May): Average 50–64°F, mild climate with gradually increasing rainfall. Cherry blossoms start blooming in March. Common activities: flower viewing, hiking, outings. Recommended clothing: light jacket, long-sleeved shirt, and rain gear.
Summer (June–August): Average 71–81°F, hot and humid. June has the most rainfall, while July and August have relatively less. Common activities: swimming, mountain climbing, outdoor activities (pay attention to sun protection). Recommended clothing: light and breathable clothing, sun hat, sunscreen.
Autumn (September–November): Average 55–77°F, comfortable and pleasant climate. September has more rainfall, then gradually cools down. Common activities: maple leaf viewing, hiking, picking. Recommended clothing: comfortable long-sleeved clothing, a jacket for mornings and evenings.
Winter (December–February): Average 39–44°F, cold and dry with little rainfall. Common activities: skiing (requires travel to nearby areas), hot springs, indoor activities. Recommended clothing: warm clothing, thick jacket, scarf, gloves, hat.
Koim climatological average
Annual average temperature: approx. 60.8°F / Annual rainfall: approx. 1433 mm / Summer humidity: 70%–80% / Rainiest month: June
Koim monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
39.7°F
42.9
February
42.1°F
71.6
March
50.2°F
119.9
April
59.4°F
142.7
May
64.6°F
174.4
June
71.6°F
216.1
July
80.6°F
108.4
August
81.5°F
98.8
September
77°F
204.1
October
64.8°F
131.2
November
55.9°F
93.1
December
44.1°F
30.3
Koim weather for the next seven days
3/19
Thursday
Moderate rain
59.4°F/51°F
3/20
Friday
Patchy rain nearby
48.8°F/44.6°F
3/21
Saturday
Sunny
58.2°F/39°F
3/22
Sunday
Patchy rain nearby
62.4°F/48.1°F
3/23
Monday
Sunny
65.4°F/49.2°F
3/24
Tuesday
Sunny
60.7°F/49.6°F
3/25
Wednesday
Partly Cloudy
57.6°F/46.8°F
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