Yakushima weather in April
In April, Yakushima sees average daytime highs of 19°C and overnight lows near 17°C, with 190 mm of rain across 12.7 wet days and about 12.7 hours of daylight. It is the 8th-warmest and 4th-wettest month of the year here.
Highs climb over the month, from about 18°C in the first days to 21°C by the end. The sky is clear or mostly clear about 27% of the time in April, and the air most often feels dry.
Daylight stretches from about 12 h 18 min at the start of April to 13 h 06 min by month's end. Set against the rest of the year, April is Yakushima's 6th-clearest and 7th-windiest month. For the whole year in context, see Yakushima's year-round climate.
- Daytime high
- 19°
- 8th warmest
- Overnight low
- 17°
- 5th coldest
- Rainfall
- 190 mm
- 12.7 wet days
- Daylight
- 12 h 42 min
- 5:56 AM – 6:40 PM
- Cloud cover
- 65%
- 6th clearest
- Wind
- 26 km/h
- 7th windiest
- Solar energy
- 4.97 kWh/m²
- Travel score
- 5.7
- out of 10
Yakushima is human settlement in Japan.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in April
Highs climb over the month, from about 18°C in the first days to 21°C by the end.
A typical April day in Yakushima reaches about 19°C in the afternoon and slips back to 17°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 22°C. Set against its neighbours, April runs about 3°C warmer than March and about 3°C cooler than May.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 |
| Avg low (°C) | 15 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 18 | 15 |
| 2 | 18 | 16 |
| 3 | 18 | 16 |
| 4 | 18 | 16 |
| 5 | 18 | 16 |
| 6 | 19 | 16 |
| 7 | 19 | 16 |
| 8 | 19 | 16 |
| 9 | 19 | 16 |
| 10 | 19 | 17 |
| 11 | 19 | 17 |
| 12 | 19 | 17 |
| 13 | 19 | 17 |
| 14 | 19 | 17 |
| 15 | 19 | 17 |
| 16 | 19 | 17 |
| 17 | 20 | 17 |
| 18 | 20 | 17 |
| 19 | 20 | 18 |
| 20 | 20 | 18 |
| 21 | 20 | 18 |
| 22 | 20 | 18 |
| 23 | 20 | 18 |
| 24 | 20 | 18 |
| 25 | 20 | 18 |
| 26 | 20 | 18 |
| 27 | 21 | 18 |
| 28 | 21 | 19 |
| 29 | 21 | 19 |
| 30 | 21 | 19 |
How April really feels in Yakushima
Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Yakushima weather by month
How April compares with the rest of the year at a glance. April is the 8th-warmest and 4th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 14° / 12° | 122 | 13.1 | 10.3 | 3.8 |
| Feb | 15° / 12° | 126 | 12.7 | 10.9 | 4.0 |
| Mar | 17° / 14° | 182 | 14.6 | 11.8 | 4.8 |
| Apr | 19° / 17° | 190 | 12.7 | 12.7 | 5.7 |
| May | 22° / 20° | 210 | 12.9 | 13.5 | 6.1 |
| Jun | 25° / 23° | 438 | 19.6 | 13.9 | 5.1 |
| Jul | 27° / 26° | 173 | 12.6 | 13.8 | 5.9 |
| Aug | 28° / 27° | 141 | 14.7 | 13.1 | 5.4 |
| Sep | 27° / 25° | 237 | 15.8 | 12.2 | 5.7 |
| Oct | 24° / 22° | 170 | 13 | 11.3 | 6.5 |
| Nov | 20° / 18° | 149 | 12 | 10.5 | 6.1 |
| Dec | 16° / 14° | 114 | 11.8 | 10.1 | 4.9 |
Cloud cover in April
The sky is clear or mostly clear about 27% of the time in April.
Beyond those clear spells, partly cloudy skies cover about 11% of April, with mostly cloudy or overcast conditions the remaining 62%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 43 | 43 | 42 | 42 | 41 | 40 | 40 | 39 | 39 | 38 | 38 | 38 | 37 | 37 | 38 | 38 | 37 | 37 | 38 | 38 | 37 | 38 | 38 | 38 | 37 | 37 | 37 | 37 | 37 | 37 |
| Cloudier (%) | 57 | 57 | 58 | 58 | 59 | 60 | 60 | 61 | 61 | 62 | 62 | 62 | 63 | 63 | 62 | 62 | 63 | 63 | 62 | 62 | 63 | 62 | 62 | 62 | 63 | 63 | 63 | 63 | 63 | 63 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 43 | 57 |
| 2 | 43 | 57 |
| 3 | 42 | 58 |
| 4 | 42 | 58 |
| 5 | 41 | 59 |
| 6 | 40 | 60 |
| 7 | 40 | 60 |
| 8 | 39 | 61 |
| 9 | 39 | 61 |
| 10 | 38 | 62 |
| 11 | 38 | 62 |
| 12 | 38 | 62 |
| 13 | 37 | 63 |
| 14 | 37 | 63 |
| 15 | 38 | 62 |
| 16 | 38 | 62 |
| 17 | 37 | 63 |
| 18 | 37 | 63 |
| 19 | 38 | 62 |
| 20 | 38 | 62 |
| 21 | 37 | 63 |
| 22 | 38 | 62 |
| 23 | 38 | 62 |
| 24 | 38 | 62 |
| 25 | 37 | 63 |
| 26 | 37 | 63 |
| 27 | 37 | 63 |
| 28 | 37 | 63 |
| 29 | 37 | 63 |
| 30 | 37 | 63 |
Chance of precipitation in April
Yakushima gets around 190 mm of rain over 12.7 wet days in April. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 43% and peaks near 45% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 43 | 42 | 42 | 42 | 42 | 42 | 43 | 43 | 43 | 44 | 44 | 44 | 44 | 45 | 45 | 45 | 44 | 44 | 44 | 43 | 43 | 42 | 42 | 42 | 41 | 41 | 40 | 40 | 39 | 39 |
| Rain chance (%) | |
|---|---|
| 1 | 43 |
| 2 | 42 |
| 3 | 42 |
| 4 | 42 |
| 5 | 42 |
| 6 | 42 |
| 7 | 43 |
| 8 | 43 |
| 9 | 43 |
| 10 | 44 |
| 11 | 44 |
| 12 | 44 |
| 13 | 44 |
| 14 | 45 |
| 15 | 45 |
| 16 | 45 |
| 17 | 44 |
| 18 | 44 |
| 19 | 44 |
| 20 | 43 |
| 21 | 43 |
| 22 | 42 |
| 23 | 42 |
| 24 | 42 |
| 25 | 41 |
| 26 | 41 |
| 27 | 40 |
| 28 | 40 |
| 29 | 39 |
| 30 | 39 |
Humidity in April
Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April lands in the dry band about 47% of days. Sticky, muggy-or-worse air turns up on roughly 9% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 66 | 65 | 64 | 62 | 61 | 60 | 58 | 56 | 55 | 54 | 51 | 50 | 49 | 47 | 46 | 45 | 44 | 43 | 42 | 42 | 41 | 40 | 39 | 38 | 37 | 35 | 34 | 33 | 31 | 30 |
| Comfortable (%) | 20 | 20 | 21 | 21 | 22 | 22 | 23 | 24 | 25 | 26 | 27 | 27 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 |
| Humid (%) | 10 | 11 | 11 | 12 | 12 | 13 | 13 | 14 | 14 | 14 | 15 | 16 | 16 | 17 | 17 | 18 | 18 | 19 | 19 | 19 | 20 | 20 | 20 | 21 | 21 | 22 | 22 | 22 | 23 | 23 |
| Muggy (%) | 4 | 4 | 4 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 9 | 9 | 10 | 10 | 11 | 12 | 13 | 13 | 14 | 15 | 16 | 17 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 3 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 66 | 20 | 10 | 4 | 0 |
| 2 | 65 | 20 | 11 | 4 | 0 |
| 3 | 64 | 21 | 11 | 4 | 0 |
| 4 | 62 | 21 | 12 | 5 | 0 |
| 5 | 61 | 22 | 12 | 5 | 0 |
| 6 | 60 | 22 | 13 | 5 | 0 |
| 7 | 58 | 23 | 13 | 6 | 0 |
| 8 | 56 | 24 | 14 | 6 | 0 |
| 9 | 55 | 25 | 14 | 6 | 0 |
| 10 | 54 | 26 | 14 | 6 | 0 |
| 11 | 51 | 27 | 15 | 7 | 0 |
| 12 | 50 | 27 | 16 | 7 | 0 |
| 13 | 49 | 28 | 16 | 7 | 0 |
| 14 | 47 | 29 | 17 | 7 | 0 |
| 15 | 46 | 29 | 17 | 8 | 0 |
| 16 | 45 | 29 | 18 | 8 | 0 |
| 17 | 44 | 29 | 18 | 8 | 0 |
| 18 | 43 | 29 | 19 | 8 | 0 |
| 19 | 42 | 29 | 19 | 9 | 1 |
| 20 | 42 | 29 | 19 | 9 | 1 |
| 21 | 41 | 29 | 20 | 10 | 1 |
| 22 | 40 | 29 | 20 | 10 | 1 |
| 23 | 39 | 29 | 20 | 11 | 1 |
| 24 | 38 | 29 | 21 | 12 | 1 |
| 25 | 37 | 28 | 21 | 13 | 1 |
| 26 | 35 | 28 | 22 | 13 | 2 |
| 27 | 34 | 28 | 22 | 14 | 2 |
| 28 | 33 | 28 | 22 | 15 | 2 |
| 29 | 31 | 28 | 23 | 16 | 2 |
| 30 | 30 | 28 | 23 | 17 | 3 |
Wind in April
Winds average 26 km/h in April.
Across April, daily wind ranges from about 25 km/h on the calmest days to 27 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Feels | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 27 | breezy |
| 2 | 27 | breezy |
| 3 | 27 | breezy |
| 4 | 27 | breezy |
| 5 | 27 | breezy |
| 6 | 27 | breezy |
| 7 | 27 | breezy |
| 8 | 27 | breezy |
| 9 | 26 | breezy |
| 10 | 26 | breezy |
| 11 | 26 | breezy |
| 12 | 26 | breezy |
| 13 | 26 | breezy |
| 14 | 26 | breezy |
| 15 | 26 | breezy |
| 16 | 26 | breezy |
| 17 | 26 | breezy |
| 18 | 26 | breezy |
| 19 | 26 | breezy |
| 20 | 26 | breezy |
| 21 | 26 | breezy |
| 22 | 25 | breezy |
| 23 | 25 | breezy |
| 24 | 25 | breezy |
| 25 | 25 | breezy |
| 26 | 25 | breezy |
| 27 | 25 | breezy |
| 28 | 25 | breezy |
| 29 | 25 | breezy |
| 30 | 25 | breezy |
Sunrise & sunset in April
Daylight runs from about 12 h 18 min at the start of April to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 48 minutes over April. Sunrise moves from 6:14 AM to 5:41 AM, and sunset from 6:30 PM to 6:49 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.3 | 12.3 | 12.3 | 12.4 | 12.4 | 12.4 | 12.5 | 12.5 | 12.5 | 12.6 | 12.6 | 12.6 | 12.6 | 12.7 | 12.7 | 12.7 | 12.8 | 12.8 | 12.8 | 12.9 | 12.9 | 12.9 | 12.9 | 13.0 | 13.0 | 13.0 | 13.1 | 13.1 | 13.1 | 13.1 |
| Sunrise (AM) | 6:14 | 6:13 | 6:11 | 6:10 | 6:09 | 6:08 | 6:06 | 6:05 | 6:04 | 6:03 | 6:01 | 6:00 | 5:59 | 5:58 | 5:57 | 5:56 | 5:54 | 5:53 | 5:52 | 5:51 | 5:50 | 5:49 | 5:48 | 5:47 | 5:46 | 5:45 | 5:44 | 5:43 | 5:42 | 5:41 |
| Sunset (PM) | 6:30 | 6:31 | 6:32 | 6:32 | 6:33 | 6:33 | 6:34 | 6:35 | 6:35 | 6:36 | 6:37 | 6:37 | 6:38 | 6:38 | 6:39 | 6:40 | 6:40 | 6:41 | 6:42 | 6:42 | 6:43 | 6:44 | 6:44 | 6:45 | 6:46 | 6:46 | 6:47 | 6:48 | 6:48 | 6:49 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.3 | 6:14 | 6:30 |
| 2 | 12.3 | 6:13 | 6:31 |
| 3 | 12.3 | 6:11 | 6:32 |
| 4 | 12.4 | 6:10 | 6:32 |
| 5 | 12.4 | 6:09 | 6:33 |
| 6 | 12.4 | 6:08 | 6:33 |
| 7 | 12.5 | 6:06 | 6:34 |
| 8 | 12.5 | 6:05 | 6:35 |
| 9 | 12.5 | 6:04 | 6:35 |
| 10 | 12.6 | 6:03 | 6:36 |
| 11 | 12.6 | 6:01 | 6:37 |
| 12 | 12.6 | 6:00 | 6:37 |
| 13 | 12.6 | 5:59 | 6:38 |
| 14 | 12.7 | 5:58 | 6:38 |
| 15 | 12.7 | 5:57 | 6:39 |
| 16 | 12.7 | 5:56 | 6:40 |
| 17 | 12.8 | 5:54 | 6:40 |
| 18 | 12.8 | 5:53 | 6:41 |
| 19 | 12.8 | 5:52 | 6:42 |
| 20 | 12.9 | 5:51 | 6:42 |
| 21 | 12.9 | 5:50 | 6:43 |
| 22 | 12.9 | 5:49 | 6:44 |
| 23 | 12.9 | 5:48 | 6:44 |
| 24 | 13.0 | 5:47 | 6:45 |
| 25 | 13.0 | 5:46 | 6:46 |
| 26 | 13.0 | 5:45 | 6:46 |
| 27 | 13.1 | 5:44 | 6:47 |
| 28 | 13.1 | 5:43 | 6:48 |
| 29 | 13.1 | 5:42 | 6:48 |
| 30 | 13.1 | 5:41 | 6:49 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 4.97 kWh/m².
For context, solar energy here swings from a low near 2.24 kWh/m² to a high of 5.86 kWh/m² in July across the year — April's 4.97 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.6 | 4.6 | 4.6 | 4.7 | 4.7 | 4.7 | 4.7 | 4.8 | 4.8 | 4.8 | 4.8 | 4.9 | 4.9 | 4.9 | 4.9 | 5.0 | 5.0 | 5.0 | 5.0 | 5.1 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.3 | 5.3 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.6 | Bright |
| 2 | 4.6 | Bright |
| 3 | 4.6 | Bright |
| 4 | 4.7 | Bright |
| 5 | 4.7 | Bright |
| 6 | 4.7 | Bright |
| 7 | 4.7 | Bright |
| 8 | 4.8 | Bright |
| 9 | 4.8 | Bright |
| 10 | 4.8 | Bright |
| 11 | 4.8 | Bright |
| 12 | 4.9 | Bright |
| 13 | 4.9 | Bright |
| 14 | 4.9 | Bright |
| 15 | 4.9 | Bright |
| 16 | 5.0 | Bright |
| 17 | 5.0 | Bright |
| 18 | 5.0 | Bright |
| 19 | 5.0 | Bright |
| 20 | 5.1 | Bright |
| 21 | 5.1 | Bright |
| 22 | 5.1 | Bright |
| 23 | 5.1 | Bright |
| 24 | 5.2 | Bright |
| 25 | 5.2 | Bright |
| 26 | 5.2 | Bright |
| 27 | 5.2 | Bright |
| 28 | 5.2 | Bright |
| 29 | 5.3 | Bright |
| 30 | 5.3 | Bright |
Hazard calendar for Yakushima
In April, Yakushima sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Yakushima sits in the Pacific typhoon belt; the season peaks July–October.
Is April a good time to visit Yakushima?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is a reasonable time to visit Yakushima for sightseeing.
What to pack for Yakushima in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Yakushima sees daytime highs around 19°C and nights near 17°C. Worth packing: rain gear, sun protection and a windbreaker. About 13 days see rain.
Sea temperature near Yakushima in April
The nearest coast averages about 21°C in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 29°C and coldest in February near 20°C.
It's comfortable for a long swim from Feb 25 to Feb 7 — about 11.4 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 21 | 20 | 20 | 21 | 23 | 25 | 28 | 29 | 28 | 26 | 24 | 22 |
| Comfort | Refreshing | Cool | Refreshing | Refreshing | Refreshing | Warm | Warm | Tropical | Warm | Warm | Warm | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 21 | Refreshing |
| Feb | 20 | Cool |
| Mar | 20 | Refreshing |
| Apr | 21 | Refreshing |
| May | 23 | Refreshing |
| Jun | 25 | Warm |
| Jul | 28 | Warm |
| Aug | 29 | Tropical |
| Sep | 28 | Warm |
| Oct | 26 | Warm |
| Nov | 24 | Warm |
| Dec | 22 | Refreshing |
UV index in Yakushima in April
Clear-sky midday UV in April peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Yakushima peaks around June 22 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 4 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 6 | 7 | 9 | 9 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Level | Moderate | High | Very high | Very high | Very high | Extreme | Extreme | Very high | Extreme | High | High | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 6 | High |
| Mar | 7 | Very high |
| Apr | 9 | Very high |
| May | 9 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Very high |
| Sep | 10 | Extreme |
| Oct | 7 | High |
| Nov | 5 | High |
| Dec | 4 | Moderate |
Air quality in Yakushima in April
Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.
Air quality in Yakushima is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (July, 10 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 13 | 16 | 20 | 21 | 19 | 13 | 10 | 11 | 10 | 10 | 11 | 10 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 16 | Moderate |
| Mar | 20 | Moderate |
| Apr | 21 | Moderate |
| May | 19 | Moderate |
| Jun | 13 | Moderate |
| Jul | 10 | Good |
| Aug | 11 | Good |
| Sep | 10 | Good |
| Oct | 10 | Good |
| Nov | 11 | Good |
| Dec | 10 | Good |
Where is Yakushima?
Yakushima sits at 30.4°N, 130.6°E, 0 m above sea level, in Japan. The nearest listed city is Nishinoomote, 51 km away.
Topography around Yakushima
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Yakushima.
Within 3 km, the terrain around Yakushima has large variations in elevation — a maximum elevation change of 608 m around an average of 81 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,916 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,893 m.
The land around Yakushima is covered by trees (54%) and water (44%) within 3 km, water (67%) and trees (33%) within 16 km, and water (93%) within 80 km.
Japan travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B
- 100 V · 50 / 60 Hz
- Prices
- ≈ 65% of US
- price level, 2025
- GDP per capita
- $35,951
- 2025
- Happiness
- 6.1 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.2
- per 100k, 2023
- Road deaths
- 3.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very low
- EF EPI 446
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Yakushima (30.388°, 130.6492°, elevation 0 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).