Yoichi weather in September
In September, Yoichi sees average daytime highs of 20°C and overnight lows near 15°C, with 139 mm of rain across 13.8 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.
Highs ease over the month, from about 22°C in the first days to 18°C by the end. The sky is clear or mostly clear about 26% of the time in September, and the air most often feels dry.
Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Yoichi's 4th-clearest and 8th-windiest month. For the whole year in context, see Yoichi's year-round climate.
- Daytime high
- 20°
- 3rd warmest
- Overnight low
- 15°
- 10th coldest
- Rainfall
- 139 mm
- 13.8 wet days
- Daylight
- 12 h 18 min
- 5:23 AM – 5:40 PM
- Cloud cover
- 62%
- 4th clearest
- Wind
- 12 km/h
- 8th windiest
- Solar energy
- 3.93 kWh/m²
- Travel score
- 5.7
- out of 10
Yoichi is town in Yoichi district, Hokkaidō, Japan.
- Density
- 135/km²
- people per km²
- Founded
- 1900
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Highs ease over the month, from about 22°C in the first days to 18°C by the end.
A typical September day in Yoichi reaches about 20°C in the afternoon and slips back to 15°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 23°C. Set against its neighbours, September runs about 3°C cooler than August and about 6°C warmer than October.
| 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) | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 17 |
| Avg low (°C) | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 12 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 22 | 18 |
| 2 | 22 | 18 |
| 3 | 22 | 17 |
| 4 | 22 | 17 |
| 5 | 22 | 17 |
| 6 | 22 | 17 |
| 7 | 22 | 17 |
| 8 | 22 | 17 |
| 9 | 21 | 17 |
| 10 | 21 | 16 |
| 11 | 21 | 16 |
| 12 | 21 | 16 |
| 13 | 21 | 16 |
| 14 | 21 | 16 |
| 15 | 20 | 15 |
| 16 | 20 | 15 |
| 17 | 20 | 15 |
| 18 | 20 | 15 |
| 19 | 20 | 15 |
| 20 | 19 | 14 |
| 21 | 19 | 14 |
| 22 | 19 | 14 |
| 23 | 19 | 14 |
| 24 | 19 | 14 |
| 25 | 18 | 13 |
| 26 | 18 | 13 |
| 27 | 18 | 13 |
| 28 | 18 | 13 |
| 29 | 18 | 13 |
| 30 | 17 | 12 |
How September really feels in Yoichi
Once humidity and wind are folded in, September 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.
September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Yoichi weather by month
How September compares with the rest of the year at a glance. September is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | -2° / -6° | 103 | 21.5 | 24.5 | 9.2 | 0.0 |
| Feb | -1° / -5° | 83 | 18.5 | 20.3 | 10.2 | 0.0 |
| Mar | 2° / -3° | 74 | 15.1 | 15.2 | 11.6 | 0.0 |
| Apr | 7° / 2° | 64 | 11.2 | 4.3 | 13.2 | 1.0 |
| May | 13° / 7° | 79 | 11.4 | 0.3 | 14.4 | 3.6 |
| Jun | 18° / 12° | 67 | 9.6 | 0 | 15.1 | 5.6 |
| Jul | 22° / 17° | 113 | 11.6 | 0 | 14.9 | 6.2 |
| Aug | 23° / 19° | 145 | 13.2 | 0 | 13.8 | 6.2 |
| Sep | 20° / 15° | 139 | 13.8 | 0 | 12.3 | 5.7 |
| Oct | 14° / 9° | 113 | 14.8 | 0.5 | 10.8 | 3.7 |
| Nov | 6° / 2° | 127 | 18.4 | 10.9 | 9.5 | 0.7 |
| Dec | 0° / -4° | 127 | 22.3 | 22.6 | 8.9 | 0.0 |
Cloud cover in September
The sky is clear or mostly clear about 26% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 56%.
| 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 (%) | 41 | 41 | 41 | 41 | 41 | 42 | 42 | 42 | 41 | 42 | 42 | 43 | 44 | 44 | 45 | 45 | 45 | 45 | 46 | 46 | 46 | 47 | 47 | 47 | 45 | 45 | 45 | 45 | 46 | 46 |
| Cloudier (%) | 59 | 59 | 59 | 59 | 59 | 58 | 58 | 58 | 59 | 58 | 58 | 57 | 56 | 56 | 55 | 55 | 55 | 55 | 54 | 54 | 54 | 53 | 53 | 53 | 55 | 55 | 55 | 55 | 54 | 54 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 41 | 59 |
| 2 | 41 | 59 |
| 3 | 41 | 59 |
| 4 | 41 | 59 |
| 5 | 41 | 59 |
| 6 | 42 | 58 |
| 7 | 42 | 58 |
| 8 | 42 | 58 |
| 9 | 41 | 59 |
| 10 | 42 | 58 |
| 11 | 42 | 58 |
| 12 | 43 | 57 |
| 13 | 44 | 56 |
| 14 | 44 | 56 |
| 15 | 45 | 55 |
| 16 | 45 | 55 |
| 17 | 45 | 55 |
| 18 | 45 | 55 |
| 19 | 46 | 54 |
| 20 | 46 | 54 |
| 21 | 46 | 54 |
| 22 | 47 | 53 |
| 23 | 47 | 53 |
| 24 | 47 | 53 |
| 25 | 45 | 55 |
| 26 | 45 | 55 |
| 27 | 45 | 55 |
| 28 | 45 | 55 |
| 29 | 46 | 54 |
| 30 | 46 | 54 |
Chance of precipitation in September
Yoichi gets around 139 mm of rain over 13.8 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 46% and peaks near 49% 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 | 43 | 44 | 44 | 44 | 45 | 45 | 45 | 45 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 47 | 47 | 48 | 48 | 49 | 49 | 49 | 49 | 49 | 49 |
| Rain chance (%) | |
|---|---|
| 1 | 43 |
| 2 | 43 |
| 3 | 44 |
| 4 | 44 |
| 5 | 44 |
| 6 | 45 |
| 7 | 45 |
| 8 | 45 |
| 9 | 45 |
| 10 | 46 |
| 11 | 46 |
| 12 | 46 |
| 13 | 46 |
| 14 | 46 |
| 15 | 46 |
| 16 | 46 |
| 17 | 46 |
| 18 | 46 |
| 19 | 46 |
| 20 | 46 |
| 21 | 47 |
| 22 | 47 |
| 23 | 48 |
| 24 | 48 |
| 25 | 49 |
| 26 | 49 |
| 27 | 49 |
| 28 | 49 |
| 29 | 49 |
| 30 | 49 |
Humidity in September
Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the dry band about 38% of days. Sticky, muggy-or-worse air turns up on roughly 10% 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 (%) | 8 | 9 | 10 | 11 | 13 | 14 | 16 | 18 | 20 | 22 | 25 | 28 | 30 | 33 | 36 | 39 | 42 | 45 | 48 | 50 | 53 | 56 | 57 | 61 | 63 | 66 | 67 | 69 | 71 | 74 |
| Comfortable (%) | 28 | 29 | 29 | 30 | 31 | 32 | 32 | 33 | 34 | 34 | 34 | 35 | 35 | 35 | 35 | 34 | 34 | 34 | 34 | 33 | 33 | 32 | 32 | 31 | 30 | 29 | 28 | 27 | 26 | 24 |
| Humid (%) | 37 | 37 | 36 | 36 | 35 | 34 | 33 | 32 | 30 | 29 | 28 | 26 | 24 | 23 | 21 | 19 | 17 | 15 | 13 | 12 | 10 | 9 | 8 | 6 | 5 | 4 | 4 | 3 | 3 | 2 |
| Muggy (%) | 24 | 22 | 21 | 20 | 18 | 17 | 16 | 15 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 1 | 1 | 1 | 0 | 0 |
| Oppressive (%) | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 8 | 28 | 37 | 24 | 4 |
| 2 | 9 | 29 | 37 | 22 | 3 |
| 3 | 10 | 29 | 36 | 21 | 3 |
| 4 | 11 | 30 | 36 | 20 | 3 |
| 5 | 13 | 31 | 35 | 18 | 3 |
| 6 | 14 | 32 | 34 | 17 | 3 |
| 7 | 16 | 32 | 33 | 16 | 3 |
| 8 | 18 | 33 | 32 | 15 | 2 |
| 9 | 20 | 34 | 30 | 13 | 2 |
| 10 | 22 | 34 | 29 | 12 | 2 |
| 11 | 25 | 34 | 28 | 11 | 2 |
| 12 | 28 | 35 | 26 | 10 | 2 |
| 13 | 30 | 35 | 24 | 9 | 2 |
| 14 | 33 | 35 | 23 | 8 | 1 |
| 15 | 36 | 35 | 21 | 7 | 1 |
| 16 | 39 | 34 | 19 | 6 | 1 |
| 17 | 42 | 34 | 17 | 6 | 1 |
| 18 | 45 | 34 | 15 | 5 | 1 |
| 19 | 48 | 34 | 13 | 5 | 1 |
| 20 | 50 | 33 | 12 | 4 | 1 |
| 21 | 53 | 33 | 10 | 4 | 0 |
| 22 | 56 | 32 | 9 | 3 | 0 |
| 23 | 57 | 32 | 8 | 3 | 0 |
| 24 | 61 | 31 | 6 | 2 | 0 |
| 25 | 63 | 30 | 5 | 2 | 0 |
| 26 | 66 | 29 | 4 | 1 | 0 |
| 27 | 67 | 28 | 4 | 1 | 0 |
| 28 | 69 | 27 | 3 | 1 | 0 |
| 29 | 71 | 26 | 3 | 0 | 0 |
| 30 | 74 | 24 | 2 | 0 | 0 |
Wind in September
Winds average 12 km/h in September.
Across September, daily wind ranges from about 11 km/h on the calmest days to 14 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) | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 11 | calm |
| 2 | 11 | calm |
| 3 | 11 | calm |
| 4 | 11 | calm |
| 5 | 11 | calm |
| 6 | 11 | calm |
| 7 | 11 | calm |
| 8 | 11 | calm |
| 9 | 11 | calm |
| 10 | 12 | calm |
| 11 | 12 | calm |
| 12 | 12 | calm |
| 13 | 12 | calm |
| 14 | 12 | calm |
| 15 | 12 | light breeze |
| 16 | 12 | light breeze |
| 17 | 12 | light breeze |
| 18 | 12 | light breeze |
| 19 | 13 | light breeze |
| 20 | 13 | light breeze |
| 21 | 13 | light breeze |
| 22 | 13 | light breeze |
| 23 | 13 | light breeze |
| 24 | 13 | light breeze |
| 25 | 13 | light breeze |
| 26 | 14 | light breeze |
| 27 | 14 | light breeze |
| 28 | 14 | light breeze |
| 29 | 14 | light breeze |
| 30 | 14 | light breeze |
Sunrise & sunset in September
Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 84 minutes over September. Sunrise moves from 5:06 AM to 5:39 AM, and sunset from 6:08 PM to 5:14 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) | 13.0 | 13.0 | 12.9 | 12.9 | 12.8 | 12.8 | 12.7 | 12.7 | 12.6 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12.1 | 12.0 | 12.0 | 11.9 | 11.9 | 11.8 | 11.8 | 11.7 | 11.7 | 11.6 | 11.6 |
| Sunrise (AM) | 5:06 | 5:07 | 5:08 | 5:09 | 5:10 | 5:11 | 5:12 | 5:13 | 5:15 | 5:16 | 5:17 | 5:18 | 5:19 | 5:20 | 5:21 | 5:23 | 5:24 | 5:25 | 5:26 | 5:27 | 5:28 | 5:29 | 5:31 | 5:32 | 5:33 | 5:34 | 5:35 | 5:36 | 5:38 | 5:39 |
| Sunset (PM) | 6:08 | 6:06 | 6:04 | 6:02 | 6:00 | 5:59 | 5:57 | 5:55 | 5:53 | 5:51 | 5:49 | 5:47 | 5:46 | 5:44 | 5:42 | 5:40 | 5:38 | 5:36 | 5:34 | 5:32 | 5:31 | 5:29 | 5:27 | 5:25 | 5:23 | 5:21 | 5:19 | 5:17 | 5:16 | 5:14 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.0 | 5:06 | 6:08 |
| 2 | 13.0 | 5:07 | 6:06 |
| 3 | 12.9 | 5:08 | 6:04 |
| 4 | 12.9 | 5:09 | 6:02 |
| 5 | 12.8 | 5:10 | 6:00 |
| 6 | 12.8 | 5:11 | 5:59 |
| 7 | 12.7 | 5:12 | 5:57 |
| 8 | 12.7 | 5:13 | 5:55 |
| 9 | 12.6 | 5:15 | 5:53 |
| 10 | 12.6 | 5:16 | 5:51 |
| 11 | 12.5 | 5:17 | 5:49 |
| 12 | 12.5 | 5:18 | 5:47 |
| 13 | 12.4 | 5:19 | 5:46 |
| 14 | 12.4 | 5:20 | 5:44 |
| 15 | 12.3 | 5:21 | 5:42 |
| 16 | 12.3 | 5:23 | 5:40 |
| 17 | 12.2 | 5:24 | 5:38 |
| 18 | 12.2 | 5:25 | 5:36 |
| 19 | 12.1 | 5:26 | 5:34 |
| 20 | 12.1 | 5:27 | 5:32 |
| 21 | 12.0 | 5:28 | 5:31 |
| 22 | 12.0 | 5:29 | 5:29 |
| 23 | 11.9 | 5:31 | 5:27 |
| 24 | 11.9 | 5:32 | 5:25 |
| 25 | 11.8 | 5:33 | 5:23 |
| 26 | 11.8 | 5:34 | 5:21 |
| 27 | 11.7 | 5:35 | 5:19 |
| 28 | 11.7 | 5:36 | 5:17 |
| 29 | 11.6 | 5:38 | 5:16 |
| 30 | 11.6 | 5:39 | 5:14 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 3.93 kWh/m².
For context, solar energy here swings from a low near 1.37 kWh/m² to a high of 5.69 kWh/m² in June across the year — September's 3.93 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) | 4.4 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.0 | 4.0 | 4.0 | 4.0 | 3.9 | 3.9 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 | 3.6 | 3.6 | 3.6 | 3.5 | 3.5 | 3.5 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.4 | Bright |
| 2 | 4.3 | Bright |
| 3 | 4.3 | Bright |
| 4 | 4.3 | Bright |
| 5 | 4.2 | Bright |
| 6 | 4.2 | Bright |
| 7 | 4.2 | Bright |
| 8 | 4.1 | Bright |
| 9 | 4.1 | Bright |
| 10 | 4.1 | Bright |
| 11 | 4.0 | Bright |
| 12 | 4.0 | Bright |
| 13 | 4.0 | Moderate |
| 14 | 4.0 | Moderate |
| 15 | 3.9 | Moderate |
| 16 | 3.9 | Moderate |
| 17 | 3.9 | Moderate |
| 18 | 3.9 | Moderate |
| 19 | 3.8 | Moderate |
| 20 | 3.8 | Moderate |
| 21 | 3.8 | Moderate |
| 22 | 3.7 | Moderate |
| 23 | 3.7 | Moderate |
| 24 | 3.7 | Moderate |
| 25 | 3.6 | Moderate |
| 26 | 3.6 | Moderate |
| 27 | 3.6 | Moderate |
| 28 | 3.5 | Moderate |
| 29 | 3.5 | Moderate |
| 30 | 3.5 | Moderate |
Hazard calendar for Yoichi
In September, Yoichi sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Yoichi sits in the Pacific typhoon belt; the season peaks July–October.
Is September a good time to visit Yoichi?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Yoichi for sightseeing.
What to pack for Yoichi in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Yoichi sees daytime highs around 20°C and nights near 15°C. Pack rain gear. About 14 days see rain.
Sea temperature near Yoichi in September
The nearest coast averages about 21°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 21 km away) is warmest in August at about 21°C and coldest in February near 6°C.
It's comfortable for a long swim from Aug 1 to Sep 23 — about 1.8 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 7 | 6 | 6 | 7 | 10 | 14 | 19 | 21 | 21 | 17 | 13 | 9 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Cool | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 7 | Bracing |
| Feb | 6 | Bracing |
| Mar | 6 | Bracing |
| Apr | 7 | Bracing |
| May | 10 | Bracing |
| Jun | 14 | Bracing |
| Jul | 19 | Cool |
| Aug | 21 | Refreshing |
| Sep | 21 | Refreshing |
| Oct | 17 | Cool |
| Nov | 13 | Bracing |
| Dec | 9 | Bracing |
UV index in Yoichi in September
Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Yoichi peaks around August 18 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 3 | 5 | 7 | 7 | 5 | 9 | 6 | 4 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | High | Moderate | Very high | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Moderate |
| Mar | 3 | Moderate |
| Apr | 5 | High |
| May | 7 | Very high |
| Jun | 7 | High |
| Jul | 5 | Moderate |
| Aug | 9 | Very high |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Air quality in Yoichi in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Yoichi is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 9 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) | 11 | 15 | 21 | 21 | 19 | 13 | 12 | 11 | 10 | 12 | 11 | 9 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 15 | Moderate |
| Mar | 21 | Moderate |
| Apr | 21 | Moderate |
| May | 19 | Moderate |
| Jun | 13 | Moderate |
| Jul | 12 | Moderate |
| Aug | 11 | Good |
| Sep | 10 | Good |
| Oct | 12 | Good |
| Nov | 11 | Good |
| Dec | 9 | Good |
Where is Yoichi?
Yoichi sits at 43.2°N, 140.8°E, 2 m above sea level, in Japan. The nearest listed city is Otaru, 19 km away.
Topography around Yoichi
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Yoichi.
Within 3 km, the terrain around Yoichi has significant variations in elevation — a maximum elevation change of 280 m around an average of 47 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 873 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,867 m.
The land around Yoichi is covered by trees (46%) and water (31%) within 3 km, trees (56%) and water (37%) within 16 km, and trees (44%) and water (44%) 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 Yoichi (43.2039°, 140.7703°, elevation 2 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).