Shimo-suwa Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Shimo-suwa.
Climate overview of Shimo-suwa
Temperatures in Shimo-suwa, Nagano Prefecture, Japan, vary greatly throughout the year. August is the hottest month at 28°C (82°F), while January is the coldest at 3°C (37°F).
With around 1663 mm (65 in) of annual rain/snowfall, Shimo-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. Sunshine peaks in January, when the city sees around 6.8 hours of sunshine per day.
Shimo-suwa Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Shimo-suwa - and find the best time to visit.
Monthly Temperature in Shimo-suwa
The climate in Shimo-suwa is known for significant temperature differences throughout the year, making the weather dynamic. 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 Shimo-suwa
Shimo-suwa has a notably wet climate with abundant precipitation, recording 1663 mm (65 in) of rain/snowfall per year. Shimo-suwa can be quite wet during July, receiving approximately 203 mm (8 in) of precipitation over 22 rainy days.
In contrast, during the driest month (December), you will experience much drier conditions, with 87 mm (3.4 in) of precipitation spread across 16 snowy/rainy days. For more details, please visit our Shimo-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 Shimo-suwa
Shimo-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 Shimo-suwa by Month
The relative humidity is high throughout the year in Shimo-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 Shimo-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
- 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 Shimo-suwa
What is the best time to visit Shimo-suwa?
May, August and September typically offer the most optimal weather in Shimo-suwa. In contrast, January, February, March and December tend to have less optimal conditions. Shimo-suwa has warm summers and cold winters.
What temperatures can I expect in Shimo-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 Shimo-suwa get?
Annual rainfall is around 1663 mm (65 in). July is the wettest month with 203 mm (8 in), while December is the driest with 87 mm (3.4 in).
How sunny is Shimo-suwa?
Shimo-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, Shimo-suwa enjoys abundant sunshine.
Shimo-suwa 3-Day Forecast
Shimo-suwa on the map
Shimo-suwa is highlighted - select any city to see its climate.
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