Spring (March–May): 47–63°F on average, mild climate, but with potentially large temperature variations; rainfall increases gradually. Common activities: Hiking, flower viewing (e.g., mountain cherry blossoms). Recommended clothing: Light jacket, long-sleeved shirt, comfortable shoes.
Summer (June–August): 70–80°F on average, hot and humid, relatively high rainfall, especially in June and August. Common activities: Boating, camping (be mindful of weather changes). Recommended clothing: Light and breathable clothing, sun hat, rain gear.
Autumn (September–November): 60–75°F on average, pleasant and comfortable climate, decreasing rainfall; colorful autumn leaves are a characteristic of the season. Common activities: Maple leaf viewing, hiking. Recommended clothing: Comfortable long-sleeved shirts, light jacket.
Winter (December–February): 36–39°F on average, cold and dry, low rainfall. Common activities: Hot spring bathing, enjoying winter scenery. Recommended clothing: Warm clothing, thick jacket, hat, gloves, scarf.
Lake Okutama climatological average
Annual average temperature: approx. 58.6°F / Annual rainfall: approx. 1315 mm / Summer humidity: 70%–80% / Rainiest month: June
Lake Okutama monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
36.1°F
10.2
February
38.7°F
44.8
March
47.5°F
83.7
April
57.9°F
90
May
63.3°F
141.7
June
70.9°F
220.5
July
80.1°F
133.3
August
81°F
214.8
September
75.6°F
207.6
October
60.8°F
98.1
November
51.1°F
62.7
December
39.9°F
7.7
Lake Okutama weather for the next seven days
10/17
Friday
Sunny
76.3°F/62°F
10/18
Saturday
Sunny
78.1°F/58.2°F
10/19
Sunday
Patchy rain nearby
72.8°F/60.1°F
10/20
Monday
Moderate rain
64.5°F/57.9°F
10/21
Tuesday
Moderate rain
58.1°F/53.6°F
10/22
Wednesday
Moderate rain
53.9°F/51.5°F
10/23
Thursday
Sunny
62.1°F/49.7°F
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