Nagano, Japan · population 68,885 · 72 weather stations within 200 km · records 1825 to 2025
Saku has an average annual daytime high of 13.0°C, based on the 1951 to 1980 baseline. Its warmest month is August, when highs typically reach 25.4°C, and its coldest is January, with overnight lows near -8.4°C.
These figures reflect annual averages, not single-day records. Daily observations are outside this dataset's precision.
Since 1900, Saku's average temperature has risen by +2.8°C. Compared to the earliest station records that begin in 1825, warming totals +2.5°C.
20-year smoothed annual temperature reconstructed from station anomalies. Dashed line: 1951–1980 baseline.
Daytime highs sit within a comfortable 15°C to 26°C range.
Saku's average annual daytime high is 13.0°C, based on the 1951 to 1980 baseline period. The warmest month is August, with highs averaging 25.4°C, and the coldest is January, with lows averaging -8.4°C.
August is the warmest month in Saku, with typical daytime highs of 25.4°C.
2023 is the hottest year on record for Saku, running +2.1°C above the 1951 to 1980 baseline.
Yes. Since 1900, Saku has warmed by roughly +2.8°C.
May to September typically offers the most comfortable daytime highs, in the 15°C to 26°C range.
Baseline period 1951 to 1980. Monthly averages are the mean of station observations weighted by proximity. Warming trend is the 20-year smoothed anomaly against that baseline.