Companion to the book by paaz

Japan Month Planner

Japan's best months change by region. Hokkaido is at its best in summer, Okinawa from winter into spring, and Mt. Fuji shows itself most clearly in winter. Tell the planner what matters to you, and it re-scores 11 regions for every month.

What matters to you?

Quick start
Pleasant weather
Fewer crowds
Lower cost
Things to see
Lower risk

Skip leaves a factor out. Important counts it twice.

Balanced: every factor counts the same.
Weighted score from 1 to 5 (5 = best for your priorities). Darker cells fit better. An outline marks each region's best months, those within 0.2 of its top score. Select a month to rank the regions, or a region to see why it scores as it does.
RegionBest months
3.83.84.23.84.03.62.82.23.03.43.83.6Mar · May
3.84.24.03.63.43.23.02.62.83.23.63.6Feb · Mar
4.04.04.04.44.03.42.62.42.83.63.83.6Apr
3.84.23.63.63.23.43.02.42.83.23.63.6Feb
3.83.82.83.63.63.83.62.23.23.63.43.6Jan · Feb · Jun · Apr +4
4.24.44.04.24.04.02.02.03.03.63.84.2Feb · Jan · Apr · Dec
4.04.24.04.03.63.62.81.82.43.23.63.8Feb · Jan · Mar · Apr
3.64.03.84.03.23.83.02.23.03.23.23.4Feb · Apr · Mar · Jun
3.43.04.04.04.64.03.02.63.23.83.83.0May
4.64.44.24.23.43.62.21.82.62.83.84.4Jan · Feb · Dec
3.83.84.24.24.03.42.42.22.83.43.83.6Mar · Apr · May

How the scores work

Every region gets a score from 1 to 5 on five factors for every month, where 5 is best for you. Your settings decide how much each factor counts, and the table shows the weighted average.

Pleasant weather
Average daily highs for 2021–2025 from the Japan Meteorological Agency (JMA). Highs of 18–25°C (64–77°F) score 5. The hotter or colder the month, the lower the score, down to 1 for highs of 31°C (88°F) and above or below 5°C (41°F). A month loses a point from 200 mm (8 in) of normal rainfall, two from 300 mm (12 in), and one more if at least 15 of its days fall in the rainy season (tsuyu).
Fewer crowds
Starts at 5. Japanese holidays take points off: New Year and the year-end, Golden Week, which runs from late April into early May and is counted in May, the start of summer vacation in July, and Obon with summer vacation in August. So do months when hotels are fuller than the region's yearly average, and months with a headline draw such as cherry blossoms, autumn leaves or a major festival.
Lower cost
How full hotels are compared with the region's own yearly average (Japan Tourism Agency, 2024–2025). Months 10% or more above average score 1 and months 10% or more below score 5. This measures demand rather than room prices, and it compares months within a region. It does not say one region is cheaper than another.
Things to see
Starts at 3. A headline seasonal highlight adds 2 and a smaller one adds 1. Cherry blossom and autumn leaf dates are JMA averages, and festival dates come from organizers and tourism boards. Off-season months lose a point: the spring thaw and late autumn in Hokkaido, and the hazy summer when Mt. Fuji is often hidden. Open a region to see what is counted.
Lower risk
Starts at 5. Typhoons take off 1 to 3 points, depending on how many pass near the region in that month in an average year (JMA, 1991–2020). Heat takes off 1 point for average highs of 31°C (88°F) or more and 2 points for 33°C (91°F) or more. Snow on the ground of 30 cm (1 ft) or more takes off 1 point, and 1 m (3 ft) or more takes off 2.

Each region is scored at one weather station: Sapporo for Hokkaido, Fukuoka for Kyushu, Naha for Okinawa and Kawaguchiko for the Mt. Fuji area. Hakone has no temperature record, so its highs are set about 3°C (5°F) below Odawara at the foot of the mountains. Kanazawa uses 2025 hotel data only, because Ishikawa's 2024 figures were unusual after the January 2024 Noto earthquake.

The scores describe a typical year. Blossoms can come a week or more early or late, and heat and typhoons vary from year to year. Check forecasts and event dates before you book.

Sources

Data as of September 30, 2026.