Best time to visit Mount Aso
The best time to visit Mount Aso is October, judged on twenty years of weather records and the events worth going for.
Mount Aso, Kumamoto, Japan
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 7.9 °C / 46 °F | -0.5 °C / 31 °F | 62 mm / 2.4 in | neither best nor good |
| February | 9.7 °C / 49 °F | 0.7 °C / 33 °F | 107 mm / 4.2 in | neither best nor good |
| March | 13.9 °C / 57 °F | 3.9 °C / 39 °F | 138 mm / 5.4 in | neither best nor good |
| April | 18.7 °C / 66 °F | 8.3 °C / 47 °F | 149 mm / 5.9 in | good month |
| May | 22.9 °C / 73 °F | 13 °C / 55 °F | 191 mm / 7.5 in | good month |
| June | 25 °C / 77 °F | 17.9 °C / 64 °F | 412 mm / 16.2 in | neither best nor good |
| July | 28.8 °C / 84 °F | 22 °C / 72 °F | 333 mm / 13.1 in | neither best nor good |
| August | 30.2 °C / 86 °F | 22.4 °C / 72 °F | 198 mm / 7.8 in | neither best nor good |
| September | 27.2 °C / 81 °F | 19.1 °C / 66 °F | 159 mm / 6.3 in | neither best nor good |
| October | 22.3 °C / 72 °F | 12.6 °C / 55 °F | 94 mm / 3.7 in | best month |
| November | 16.2 °C / 61 °F | 6 °C / 43 °F | 82 mm / 3.2 in | good month |
| December | 9.7 °C / 49 °F | 0.7 °C / 33 °F | 67 mm / 2.6 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: good
- MMay: good
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: neither
- OOctober: best
- NNovember: good
- DDecember: neither
- Best
- October
- Good
- April–May, November
Why these months
April · good
In its favour: feels like (high) 17.7 °C / 64 °F, average daily high 18.7 °C / 66 °F, share of daylight that is sunny 66%, average daily low 8.3 °C / 47 °F, relative humidity 68%, wet days 11.8 days.
Against: precipitation 149 mm / 5.9 in, days with heavy rain 5.2 days.
May · good
In its favour: feels like (high) 23.4 °C / 74 °F, average daily high 22.9 °C / 73 °F, share of daylight that is sunny 63%, average daily low 13 °C / 55 °F, relative humidity 70%.
Against: precipitation 191 mm / 7.5 in, days with heavy rain 5.3 days, wet days 12.6 days.
October · best
In its favour: feels like (high) 22.3 °C / 72 °F, average daily high 22.3 °C / 72 °F, share of daylight that is sunny 70%, precipitation 94 mm / 3.7 in, wet days 7.9 days, days with heavy rain 2.8 days, average daily low 12.6 °C / 55 °F, relative humidity 75%.
November · good
In its favour: feels like (high) 14.4 °C / 58 °F, share of daylight that is sunny 72%, precipitation 82 mm / 3.2 in, average daily high 16.2 °C / 61 °F, wet days 8 days, days with heavy rain 2.5 days, average daily low 6 °C / 43 °F, relative humidity 76%.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: good
- FFebruary: neither
- MMarch: good
- AApril: good
- MMay: neither
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: neither
- OOctober: best
- NNovember: best
- DDecember: good
- Best
- October–November
- Good
- March–April, December–January
Why these months
January · good
In its favour: precipitation 62 mm / 2.4 in, wet days 7.8 days, days with heavy rain 2 days, average daily high 7.9 °C / 46 °F, share of daylight that is sunny 69%, wind (daily max) 12 km/h / 8 mph, daylight per day 10.3 h, average daily low -0.5 °C / 31 °F.
Against: feels like (high) 4.3 °C / 40 °F.
March · good
In its favour: average daily high 13.9 °C / 57 °F, feels like (high) 11.7 °C / 53 °F, share of daylight that is sunny 66%, daylight per day 12 h, average daily low 3.9 °C / 39 °F, wet days 12 days, wind (daily max) 13 km/h / 8 mph.
Against: precipitation 138 mm / 5.4 in, days with heavy rain 4.8 days.
April · good
In its favour: average daily high 18.7 °C / 66 °F, feels like (high) 17.7 °C / 64 °F, average daily low 8.3 °C / 47 °F, share of daylight that is sunny 66%, daylight per day 13 h, wet days 11.8 days, wind (daily max) 13 km/h / 8 mph.
Against: precipitation 149 mm / 5.9 in, days with heavy rain 5.2 days.
October · best
In its favour: average daily high 22.3 °C / 72 °F, precipitation 94 mm / 3.7 in, wet days 7.9 days, average daily low 12.6 °C / 55 °F, share of daylight that is sunny 70%, feels like (high) 22.3 °C / 72 °F, days with heavy rain 2.8 days, daylight per day 11.4 h, wind (daily max) 11 km/h / 7 mph.
November · best
In its favour: average daily high 16.2 °C / 61 °F, precipitation 82 mm / 3.2 in, wet days 8 days, feels like (high) 14.4 °C / 58 °F, average daily low 6 °C / 43 °F, share of daylight that is sunny 72%, days with heavy rain 2.5 days, wind (daily max) 11 km/h / 7 mph, daylight per day 10.5 h.
December · good
In its favour: precipitation 67 mm / 2.6 in, average daily high 9.7 °C / 49 °F, wet days 8.9 days, days with heavy rain 2.2 days, share of daylight that is sunny 72%, average daily low 0.7 °C / 33 °F, wind (daily max) 12 km/h / 8 mph, feels like (high) 6.6 °C / 44 °F, daylight per day 10 h.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is 女鹿平温泉めがひらスキー場, Megahiraonsen Megahira Ski Area, 203 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | 4.3 °C | 6.6 °C | 11.7 °C | 17.7 °C | 23.4 °C | 27.3 °C | 32.8 °C | 34.4 °C | 29.8 °C | 22.3 °C | 14.4 °C | 6.6 °C |
| Days with heavy rain | 2 days | 4.1 days | 4.8 days | 5.2 days | 5.3 days | 10.3 days | 8.2 days | 4.8 days | 4.4 days | 2.8 days | 2.5 days | 2.2 days |
| Time rain usually falls | 3 am | 11 pm | 7 am | 11 am | 11 am | 2 pm | 2 pm | 3 pm | 2 pm | 4 pm | 8 am | 3 pm |
| Sunshine per day | 7.1 h | 7.5 h | 7.9 h | 8.5 h | 8.7 h | 6.7 h | 8.5 h | 9.7 h | 8.2 h | 8 h | 7.5 h | 7.2 h |
| Relative humidity | 72% | 71% | 70% | 68% | 70% | 80% | 81% | 79% | 78% | 75% | 76% | 75% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 11 µg/m³ | 9.4 µg/m³ | 14 µg/m³ | 12.2 µg/m³ | 11 µg/m³ | 10.1 µg/m³ | 8.3 µg/m³ | 10.8 µg/m³ | 7.9 µg/m³ | 8.1 µg/m³ | 9.3 µg/m³ | 9.5 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 19.1 µg/m³ | 16.7 µg/m³ | 25.7 µg/m³ | 20.2 µg/m³ | 19.3 µg/m³ | 18.7 µg/m³ | 15 µg/m³ | 19.3 µg/m³ | 13.9 µg/m³ | 13.5 µg/m³ | 16.5 µg/m³ | 17.7 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.