Saku Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Saku.
Climate overview of Saku
Saku, Nagano Prefecture, Japan, sees big temperature differences between seasons, with August peaking at 28°C (82°F) and January dropping to 4°C (39°F).
With around 1563 mm (62 in) of annual rain/snowfall, Saku has a notably wet climate. However, this rain/snowfall is not evenly distributed — the city has warm summers and cold winters. The wettest month is July. The most sunshine falls in May, with an average of 7.0 hours of daily sunshine.
Saku Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Saku - and find the best time to visit.
Monthly Temperature in Saku
Visitors to Saku can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 28°C (82°F) in August. In January, the coolest month of the year, temperatures drop to a chilly 4°C (39°F).
At night, temperatures range from around 19°C (66°F) in August to -6°C (21°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Saku
Saku is known for its substantial rain/snowfall, with annual precipitation reaching 1563 mm (62 in). Saku can be quite wet during July, receiving approximately 215 mm (8.5 in) of precipitation over 22 rainy days.
In contrast, during the driest month (December), you will experience much drier conditions, with 57 mm (2.2 in) of precipitation spread across 14 snowy/rainy days. For more details, please visit our Saku Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Saku
Saku experiences moderate variation in sunshine hours across the seasons. With 7.0 hours daily sunshine in May, it dips to 4.3 hours in January, offering a balanced mix of sunny and overcast days.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Saku by Month
The relative humidity is high throughout the year in Saku.
The city experiences its highest humidity in January, reaching 78%. In April, the humidity drops to its lowest level at 61%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Saku
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May and August
- Warmest weather: July and August
- Most sunshine: May and August
- Fewer rainy days: April, May, October, November and December
- Seasonal pattern: Warm summers and cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
Frequently asked questions about the climate in Saku
What is the best time to visit Saku?
May and August typically offer the most optimal weather in Saku. In contrast, January, February, March and December tend to have less optimal conditions. Saku has warm summers and cold winters.
What temperatures can I expect in Saku?
Daytime highs range from 4°C (39°F) in January to 28°C (82°F) in August. Nighttime lows range from -6°C (21°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Saku get?
Annual rainfall is around 1563 mm (62 in). July is the wettest month with 215 mm (8.5 in), while December is the driest with 57 mm (2.2 in).
How sunny is Saku?
Saku receives around 1,951 hours of sunshine per year. May is the sunniest month with 209 hours, while January is the cloudiest with just 128 hours.
Saku 3-Day Forecast
Saku 3-Day Forecast
Saku on the map
Saku is highlighted - select any city to see its climate.
Popular this month
Where to go in July - average daytime high across popular destinations.
Osaka
32°C (90°F) Tokyo30°C (86°F) Naha
30°C (86°F) Kyoto31°C (88°F) Hakone28°C (82°F) Hakuba26°C (79°F) Sapporo24°C (75°F) Niseko24°C (75°F) 
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