The combination of the clear weather and the beautiful scenery was simply breathtaking. The white waves reflected on the blue lake surface, creating a stunning sight. The boat didn't rock at all.
I joined the tour alone this time, but the tour guide was very kind and even took photos for me since I was traveling alone. Lake Biwa is beautiful, and you absolutely must take the cable car up; there's a huge field of rapeseed flowers there.
The prices are affordable, and they'll add you to a Line group in advance. The driver will contact you the day before, which gives you peace of mind.
Anonymous User
Solo traveler
Omihachiman Weather, Climate and Best Time to Visit
Data source:Meteostat Update date:2025-09
Omihachiman year round climate
Spring (March–May): 8.7–17.7°C on average, mild climate but with relatively high rainfall, especially in April and May. Common activities: Cherry blossom viewing, visiting Hikone Castle, exploring the water towns. Recommended clothing: Light jacket, comfortable long-sleeved clothing, rain gear.
Summer (June–August): 22.7–28.5°C on average, hot and humid with relatively high rainfall, especially in June and July. Common activities: Swimming at Lake Biwa, enjoying outdoor activities (pay attention to sun protection). Recommended clothing: Light and breathable clothing, sun hat, sunscreen.
Autumn (September–November): 18.3–13.0°C on average, pleasant and comfortable climate with reduced rainfall. Common activities: Maple leaf viewing, cycling through the old streets of Omihachiman. Recommended clothing: Comfortable long-sleeved clothing, light jacket.
Winter (December–February): 6.7–5.0°C on average, cold and dry with low rainfall. Common activities: Tasting local cuisine, experiencing onsen. Recommended clothing: Warm jacket, hat, scarf, gloves.
Omihachiman climatological average
Annual average temperature: approx. 15.7°C / Annual rainfall: approx. 1670 mm / Summer humidity: 70%–80% / Rainiest month: July
Omihachiman monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
4.1°C
90.8
February
5°C
79.7
March
8.7°C
123.8
April
14.5°C
152.2
May
17.7°C
188.3
June
22.7°C
223.6
July
27.6°C
235.1
August
28.5°C
165.1
September
26.1°C
117.4
October
18.3°C
124.5
November
13°C
96.9
December
6.7°C
72.7
Omihachiman weather for the next seven days
6/22
Monday
Patchy rain nearby
21.9°C/19.3°C
6/23
Tuesday
Partly Cloudy
23.6°C/18.2°C
6/24
Wednesday
Partly Cloudy
23.6°C/17°C
6/25
Thursday
Heavy rain
20.5°C/19.5°C
6/26
Friday
Heavy rain
22.5°C/18.9°C
6/27
Saturday
Patchy rain nearby
22.4°C/18.3°C
6/28
Sunday
Moderate rain
25.9°C/19.2°C
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