Suwa Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Suwa.
Climate overview of Suwa
Suwa, Nagano Prefecture, Japan, sees big temperature differences between seasons, with August peaking at 28°C (82°F) and January dropping to 3°C (37°F).
With around 1607 mm (63 in) of annual rain/snowfall, Suwa 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 January, with an average of 6.8 hours of daily sunshine.
Suwa Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Suwa - and find the best time to visit.
Monthly Temperature in Suwa
Visitors to Suwa 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 3°C (37°F).
At night, temperatures range from around 18°C (64°F) in August to -7°C (19°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Suwa
Suwa is known for its substantial rain/snowfall, with annual precipitation reaching 1607 mm (63 in). Suwa can be quite wet during July, receiving approximately 196 mm (7.7 in) of precipitation over 22 rainy days.
In contrast, during the driest month (December), you will experience much drier conditions, with 82 mm (3.2 in) of precipitation spread across 16 snowy/rainy days. For more details, please visit our Suwa 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 Suwa
Suwa experiences moderate variation in sunshine hours across the seasons. With 6.8 hours daily sunshine in January, it dips to 4.7 hours in September, 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 Suwa by Month
The relative humidity is high throughout the year in Suwa.
The city experiences its highest humidity in July, reaching 73%. In February, the humidity drops to its lowest level at 54%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Suwa
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, August and September
- Warmest weather: July and August
- Most sunshine: January, March, April, May, August and December
- Fewer rainy days: April, May, October, November and December
- Seasonal pattern: Warm summers and cold winters
- Coldest conditions: January, with freezing nights around -7°C (19°F).
Frequently asked questions about the climate in Suwa
What is the best time to visit Suwa?
May, August and September typically offer the most optimal weather in Suwa. In contrast, January, February, March and December tend to have less optimal conditions. Suwa has warm summers and cold winters.
What temperatures can I expect in Suwa?
Daytime highs range from 3°C (37°F) in January to 28°C (82°F) in August. Nighttime lows range from -7°C (19°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Suwa get?
Annual rainfall is around 1607 mm (63 in). July is the wettest month with 196 mm (7.7 in), while December is the driest with 82 mm (3.2 in).
How sunny is Suwa?
Suwa receives around 2,178 hours of sunshine per year. January is the sunniest month with 204 hours, while September is the cloudiest with just 142 hours. Overall, Suwa enjoys abundant sunshine.
Suwa 3-Day Forecast
Suwa 3-Day Forecast
Suwa on the map
Suwa 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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