Best time to visit Mount Koya
Month-by-month weather averages for Mount Koya.
Mount Koya, Wakayama, 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 | 7.8 °C / 46 °F | 0.7 °C / 33 °F | 72 mm / 2.8 in | neither best nor good |
| February | 9 °C / 48 °F | 1.3 °C / 34 °F | 90 mm / 3.6 in | neither best nor good |
| March | 13.1 °C / 56 °F | 4.2 °C / 40 °F | 132 mm / 5.2 in | neither best nor good |
| April | 18 °C / 64 °F | 8.9 °C / 48 °F | 138 mm / 5.4 in | good month |
| May | 22.6 °C / 73 °F | 13.8 °C / 57 °F | 170 mm / 6.7 in | good month |
| June | 25.7 °C / 78 °F | 18.4 °C / 65 °F | 259 mm / 10.2 in | neither best nor good |
| July | 29.6 °C / 85 °F | 23.1 °C / 74 °F | 242 mm / 9.5 in | neither best nor good |
| August | 31.4 °C / 89 °F | 24 °C / 75 °F | 161 mm / 6.3 in | neither best nor good |
| September | 27.9 °C / 82 °F | 20.3 °C / 69 °F | 187 mm / 7.4 in | neither best nor good |
| October | 22.1 °C / 72 °F | 14 °C / 57 °F | 176 mm / 6.9 in | good month |
| November | 16.2 °C / 61 °F | 7.7 °C / 46 °F | 100 mm / 3.9 in | good month |
| December | 10.3 °C / 51 °F | 2.7 °C / 37 °F | 84 mm / 3.3 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: good
- NNovember: good
- DDecember: neither
- Good
- April–May, October–November
Why these months
April · good
In its favour: feels like (high) 16.8 °C / 62 °F, average daily high 18 °C / 64 °F, share of daylight that is sunny 70%, relative humidity 66%, average daily low 8.9 °C / 48 °F, wet days 11.5 days.
Against: precipitation 138 mm / 5.4 in, days with heavy rain 4.8 days.
May · good
In its favour: feels like (high) 22.8 °C / 73 °F, average daily high 22.6 °C / 73 °F, share of daylight that is sunny 69%, average daily low 13.8 °C / 57 °F, relative humidity 68%, wet days 11.7 days.
Against: precipitation 170 mm / 6.7 in, days with heavy rain 5.3 days.
October · good
In its favour: feels like (high) 22.2 °C / 72 °F, average daily high 22.1 °C / 72 °F, share of daylight that is sunny 74%, average daily low 14 °C / 57 °F, wet days 10.9 days, relative humidity 74%.
Against: precipitation 176 mm / 6.9 in, days with heavy rain 5.2 days.
November · good
In its favour: feels like (high) 14.4 °C / 58 °F, share of daylight that is sunny 77%, average daily high 16.2 °C / 61 °F, precipitation 100 mm / 3.9 in, wet days 8.8 days, days with heavy rain 3.4 days, average daily low 7.7 °C / 46 °F, relative humidity 73%.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: good
- FFebruary: good
- MMarch: good
- AApril: good
- MMay: neither
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: neither
- OOctober: good
- NNovember: best
- DDecember: good
- Best
- November
- Good
- October, December–April
Why these months
January · good
In its favour: precipitation 72 mm / 2.8 in, days with heavy rain 1.9 days, average daily high 7.8 °C / 46 °F, wet days 9.8 days, share of daylight that is sunny 83%, average daily low 0.7 °C / 33 °F, wind (daily max) 15 km/h / 9 mph, daylight per day 10.2 h.
Against: feels like (high) 4 °C / 39 °F.
February · good
In its favour: precipitation 90 mm / 3.6 in, average daily high 9 °C / 48 °F, share of daylight that is sunny 77%, wet days 10.3 days, days with heavy rain 3.2 days, daylight per day 11 h, average daily low 1.3 °C / 34 °F, wind (daily max) 15 km/h / 9 mph, feels like (high) 5.5 °C / 42 °F.
March · good
In its favour: average daily high 13.1 °C / 56 °F, average daily low 4.2 °C / 40 °F, share of daylight that is sunny 75%, daylight per day 12 h, feels like (high) 10.7 °C / 51 °F, precipitation 132 mm / 5.2 in, wet days 12 days, wind (daily max) 15 km/h / 9 mph.
Against: days with heavy rain 5 days.
April · good
In its favour: average daily high 18 °C / 64 °F, feels like (high) 16.8 °C / 62 °F, average daily low 8.9 °C / 48 °F, share of daylight that is sunny 70%, daylight per day 13 h, wet days 11.5 days, wind (daily max) 15 km/h / 9 mph.
Against: precipitation 138 mm / 5.4 in, days with heavy rain 4.8 days.
October · good
In its favour: average daily high 22.1 °C / 72 °F, average daily low 14 °C / 57 °F, share of daylight that is sunny 74%, feels like (high) 22.2 °C / 72 °F, wet days 10.9 days, daylight per day 11.3 h, wind (daily max) 12 km/h / 8 mph.
Against: precipitation 176 mm / 6.9 in, days with heavy rain 5.2 days.
November · best
In its favour: average daily high 16.2 °C / 61 °F, precipitation 100 mm / 3.9 in, wet days 8.8 days, feels like (high) 14.4 °C / 58 °F, average daily low 7.7 °C / 46 °F, share of daylight that is sunny 77%, days with heavy rain 3.4 days, wind (daily max) 13 km/h / 8 mph, daylight per day 10.4 h.
December · good
In its favour: average daily high 10.3 °C / 51 °F, precipitation 84 mm / 3.3 in, share of daylight that is sunny 83%, days with heavy rain 2.6 days, wet days 10.3 days, average daily low 2.7 °C / 37 °F, wind (daily max) 15 km/h / 9 mph, feels like (high) 7.1 °C / 45 °F.
Against: daylight per day 9.9 h.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is 氷ノ山国際スキー場, Hyounosen Kokusai Ski Resort, 160 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 °C | 5.5 °C | 10.7 °C | 16.8 °C | 22.8 °C | 27.9 °C | 33.8 °C | 35.8 °C | 30.6 °C | 22.2 °C | 14.4 °C | 7.1 °C |
| Days with heavy rain | 1.9 days | 3.2 days | 5 days | 4.8 days | 5.3 days | 7 days | 7.2 days | 4.2 days | 5.4 days | 5.2 days | 3.4 days | 2.6 days |
| Time rain usually falls | 9 am | 1 pm | 11 am | 2 pm | 3 pm | 3 pm | 2 pm | 2 pm | 2 pm | 3 pm | 3 pm | 9 pm |
| Sunshine per day | 8.5 h | 8.4 h | 9 h | 9.1 h | 9.6 h | 8.5 h | 9.7 h | 10.7 h | 9.1 h | 8.4 h | 8 h | 8.3 h |
| Relative humidity | 69% | 68% | 67% | 66% | 68% | 75% | 77% | 73% | 75% | 74% | 73% | 71% |
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 | 13.2 µg/m³ | 13.7 µg/m³ | 16.3 µg/m³ | 18.2 µg/m³ | 14.6 µg/m³ | 18.8 µg/m³ | 16.3 µg/m³ | 14.1 µg/m³ | 11.9 µg/m³ | 11.5 µg/m³ | 13.4 µg/m³ | 12.3 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 25 µg/m³ | 24.6 µg/m³ | 28.1 µg/m³ | 30.6 µg/m³ | 25.6 µg/m³ | 34.3 µg/m³ | 30.3 µg/m³ | 24.6 µg/m³ | 22 µg/m³ | 19.6 µg/m³ | 24.6 µg/m³ | 23.6 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.