Mount Aka (Yatsugatake)Mount Aka (Yatsugatake) at a Glance#
When to Go
Best Time to Visit Mount Aka (Yatsugatake)#
Best visited in summer for hiking and autumn for colours; avoid winter without mountaineering experience.
Summer
Jun-Aug · 10-25°C
Warm days and accessible trails; wildflowers at lower elevations.
Autumn
Sep-Nov · -5-15°C
Crisp air and vivid autumn colours; mornings can be foggy.
Weather & Climate near Mount Aka (Yatsugatake)#
Climate
Mount Aka (Yatsugatake)'s climate is classified as Subarctic - Subarctic climate with cool summers (peaking in August) and freezing winters (coldest in January). Temperatures range from -15°C to 17°C. Heavy rainfall (2222 mm/year), wettest in August.
Air Quality:
AQI 48
Good
Best Time to Visit
AugustJulySeptember
Temperature & Rainfall
Temperature Range
33°
Warmest Month
-19°
Coldest Month
Monthly Conditions
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | Poor | -15° - -5° | -19° | 55 mm | partly cloudy | 88% | 6.9 m/s | 0.4 low | 9.9h |
| February | Poor | -15° - -5° | -19° | 74 mm | partly cloudy | 85% | 7.3 m/s | 0.6 moderate | 10.8h |
| March | Poor | -12° - -2° | -15° | 123 mm | partly cloudy | 80% | 6.5 m/s | 0.9 moderate | 11.8h |
| April | Poor | -6° - 5° | -7° | 177 mm | partly cloudy | 76% | 7.3 m/s | 1.2 high | 13.0h |
| May | Poor | -1° - 10° | 0° | 200 mm | overcast | 75% | 6.6 m/s | 1.5 high | 13.9h |
| June | Poor | 4° - 13° | 5° | 287 mm | overcast | 80% | 5.9 m/s | 1.5 high | 14.4h |
| July | Acceptable | 8° - 16° | 12° | 299 mm | overcast | 83% | 5.2 m/s | 1.6 very high | 14.1h |
| August | Acceptable | 9° - 17° | 13° | 365 mm | overcast | 82% | 5.5 m/s | 1.7 very high | 13.3h |
| September | Poor | 6° - 14° | 7° | 313 mm | overcast | 84% | 5.6 m/s | 1.3 high | 12.3h |
| October | Poor | -1° - 9° | 0° | 174 mm | partly cloudy | 85% | 5.4 m/s | 0.9 moderate | 11.2h |
| November | Poor | -6° - 4° | -7° | 102 mm | partly cloudy | 85% | 6.5 m/s | 0.5 moderate | 10.2h |
| December | Poor | -12° - -2° | -14° | 53 mm | some cloud | 87% | 6.5 m/s | 0.4 low | 9.7h |
Getting There & Around
How to Get to Mount Aka (Yatsugatake)#
Reachable from Chino or other Yatsugatake-area towns by bus to trailheads; nearest rail access typically requires a short bus or taxi ride to the mountain’s trailhead.
Tips for Visiting Mount Aka (Yatsugatake)#
- Start early to avoid afternoon thunderstorms typical of Yatsugatake peaks.
- There are multiple routes; the Akadake trail is popular and signposted - study the trailhead information before setting out.
- Use mountain huts responsibly - they provide shelter but require bookings in high season.