Omachi Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Omachi.
Climate overview of Omachi
Omachi, Nagano Prefecture, Japan, sees big temperature differences between seasons, with August peaking at 26°C (79°F) and January dropping to -1°C (30°F).
Rain/snowfall is high, totalling around 2875 mm (113 in) per year. July is the wettest month and November the driest. The city also experiences warm summers and very cold winters. April is the sunniest month, averaging 5.9 hours of sunshine per day.
Omachi Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Omachi - and find the best time to visit.
Monthly Temperature in Omachi
Visitors to Omachi can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a comfortable 26°C (79°F) in August, the warmest time of the year, to a very cold -1°C (30°F) during cooler months like January.
At night, you can expect temperatures ranging from 17°C (63°F) in August to around -9°C (16°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Omachi
Omachi is known for its substantial rain/snowfall, with annual precipitation reaching 2875 mm (113 in). Significant seasonal changes in precipitation occur throughout the year. In the wettest month, July it receives heavy rainfall, averaging 400 mm (16 in) of precipitation, recorded across 21 rainy days. In contrast, the driest month November brings less rainfall, with 173 mm (6.8 in) over 17 rainy days. For more details, please visit our Omachi 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 Omachi
Seasonal changes in sunshine hours are quite dramatic in Omachi. While April receives considerable daily sunshine with up to 5.9 hours, January marks the darkest time of the year, where sunshine is scarce with only 2.7 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Best Time to Visit Omachi
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Warmest weather: July and August
- Most sunshine: April and May
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -9°C (16°F).
Frequently asked questions about the climate in Omachi
What is the best time to visit Omachi?
Omachi has warm summers and very cold winters.
What temperatures can I expect in Omachi?
Daytime highs range from -1°C (30°F) in January to 26°C (79°F) in August. Nighttime lows range from -9°C (16°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Omachi get?
Annual rainfall is around 2875 mm (113 in). July is the wettest month with 400 mm (16 in), while November is the driest with 173 mm (6.8 in).
How sunny is Omachi?
Omachi receives around 1,559 hours of sunshine per year. April is the sunniest month with 177 hours, while January is the cloudiest with just 80 hours.
Omachi 3-Day Forecast
Omachi on the map
Omachi is highlighted - select any city to see its climate.
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