Hachimantai weather in October
In October, Hachimantai sees average daytime highs of 15°C and overnight lows near 7°C, with 111 mm of precipitation across 11.2 wet days and about 10.9 hours of daylight. It is the 6th-warmest and 4th-wettest month of the year here.
Highs ease over the month, from about 18°C in the first days to 13°C by the end. The sky is clear or mostly clear about 23% of the time in October, and the air most often feels dry.
Daylight stretches from about 11 h 36 min at the start of October to 10 h 18 min by month's end. Set against the rest of the year, October is Hachimantai's 3rd-clearest and 8th-windiest month. For the whole year in context, see Hachimantai's year-round climate.
- Daytime high
- 15°
- 6th warmest
- Overnight low
- 7°
- 7th coldest
- Precipitation
- 111 mm
- 11.2 wet days
- Daylight
- 10 h 54 min
- 5:53 AM – 4:48 PM
- Cloud cover
- 64%
- 3rd clearest
- Wind
- 9 km/h
- 8th windiest
- Solar energy
- 2.94 kWh/m²
- Travel score
- 4.5
- out of 10
Hachimantai is city in Iwate Prefecture, Japan.
- Density
- 29/km²
- people per km²
- Founded
- 2005
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in October
Highs ease over the month, from about 18°C in the first days to 13°C by the end.
A typical October day in Hachimantai reaches about 15°C in the afternoon and slips back to 7°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 19°C. Set against its neighbours, October runs about 6°C cooler than September and about 7°C warmer than November.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 18 | 18 | 18 | 18 | 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 | 12 |
| Avg low (°C) | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 18 | 10 |
| 2 | 18 | 10 |
| 3 | 18 | 10 |
| 4 | 18 | 9 |
| 5 | 17 | 9 |
| 6 | 17 | 9 |
| 7 | 17 | 9 |
| 8 | 17 | 8 |
| 9 | 17 | 8 |
| 10 | 16 | 8 |
| 11 | 16 | 8 |
| 12 | 16 | 8 |
| 13 | 16 | 7 |
| 14 | 16 | 7 |
| 15 | 15 | 7 |
| 16 | 15 | 7 |
| 17 | 15 | 6 |
| 18 | 15 | 6 |
| 19 | 15 | 6 |
| 20 | 14 | 6 |
| 21 | 14 | 6 |
| 22 | 14 | 5 |
| 23 | 14 | 5 |
| 24 | 14 | 5 |
| 25 | 13 | 5 |
| 26 | 13 | 5 |
| 27 | 13 | 5 |
| 28 | 13 | 4 |
| 29 | 13 | 4 |
| 30 | 12 | 4 |
| 31 | 12 | 4 |
How October really feels in Hachimantai
Once humidity and wind are folded in, October 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.
October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Hachimantai weather by month
How October compares with the rest of the year at a glance. October is the 6th-warmest and 4th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | -1° / -9° | 60 | 10.5 | 13.2 | 9.5 | 0.0 |
| Feb | 0° / -8° | 59 | 10.4 | 12.1 | 10.4 | 0.0 |
| Mar | 4° / -4° | 90 | 14.2 | 12.1 | 11.7 | 0.2 |
| Apr | 11° / 2° | 90 | 14.1 | 4 | 13 | 2.6 |
| May | 17° / 8° | 93 | 12.7 | 0.3 | 14.2 | 5.1 |
| Jun | 21° / 13° | 105 | 12.8 | 0 | 14.8 | 5.7 |
| Jul | 24° / 17° | 144 | 16.4 | 0 | 14.5 | 5.6 |
| Aug | 25° / 18° | 141 | 14.9 | 0 | 13.6 | 5.9 |
| Sep | 21° / 14° | 138 | 12.9 | 0 | 12.3 | 5.8 |
| Oct | 15° / 7° | 111 | 11.2 | 0.1 | 10.9 | 4.5 |
| Nov | 8° / 1° | 76 | 12.8 | 4 | 9.8 | 1.4 |
| Dec | 2° / -5° | 74 | 12 | 12 | 9.2 | 0.0 |
Cloud cover in October
The sky is clear or mostly clear about 23% of the time in October.
Beyond those clear spells, partly cloudy skies cover about 21% of October, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to open up as the month goes on.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 38 | 38 | 39 | 39 | 39 | 40 | 40 | 40 | 40 | 40 | 42 | 43 | 43 | 44 | 44 | 44 | 45 | 45 | 45 | 46 | 46 | 46 | 46 | 47 | 47 | 47 | 48 | 48 | 48 | 49 | 49 |
| Cloudier (%) | 62 | 62 | 61 | 61 | 61 | 60 | 60 | 60 | 60 | 60 | 58 | 57 | 57 | 56 | 56 | 56 | 55 | 55 | 55 | 54 | 54 | 54 | 54 | 53 | 53 | 53 | 52 | 52 | 52 | 51 | 51 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 38 | 62 |
| 2 | 38 | 62 |
| 3 | 39 | 61 |
| 4 | 39 | 61 |
| 5 | 39 | 61 |
| 6 | 40 | 60 |
| 7 | 40 | 60 |
| 8 | 40 | 60 |
| 9 | 40 | 60 |
| 10 | 40 | 60 |
| 11 | 42 | 58 |
| 12 | 43 | 57 |
| 13 | 43 | 57 |
| 14 | 44 | 56 |
| 15 | 44 | 56 |
| 16 | 44 | 56 |
| 17 | 45 | 55 |
| 18 | 45 | 55 |
| 19 | 45 | 55 |
| 20 | 46 | 54 |
| 21 | 46 | 54 |
| 22 | 46 | 54 |
| 23 | 46 | 54 |
| 24 | 47 | 53 |
| 25 | 47 | 53 |
| 26 | 47 | 53 |
| 27 | 48 | 52 |
| 28 | 48 | 52 |
| 29 | 48 | 52 |
| 30 | 49 | 51 |
| 31 | 49 | 51 |
Chance of precipitation in October
Hachimantai gets around 111 mm of rain and snow over 11.2 wet days in October. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 36% and peaks near 39% on the wettest days, and about 0 day brings snow.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 39 | 39 | 39 | 39 | 39 | 39 | 38 | 38 | 37 | 36 | 35 | 35 | 34 | 34 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 34 | 34 | 35 | 35 | 36 | 36 | 36 | 36 | 37 | 37 |
| Snow chance (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 39 | 0 |
| 2 | 39 | 0 |
| 3 | 39 | 0 |
| 4 | 39 | 0 |
| 5 | 39 | 0 |
| 6 | 39 | 0 |
| 7 | 38 | 0 |
| 8 | 38 | 0 |
| 9 | 37 | 0 |
| 10 | 36 | 0 |
| 11 | 35 | 0 |
| 12 | 35 | 0 |
| 13 | 34 | 0 |
| 14 | 34 | 0 |
| 15 | 33 | 1 |
| 16 | 33 | 1 |
| 17 | 33 | 1 |
| 18 | 33 | 1 |
| 19 | 33 | 1 |
| 20 | 33 | 1 |
| 21 | 33 | 1 |
| 22 | 34 | 1 |
| 23 | 34 | 1 |
| 24 | 35 | 1 |
| 25 | 35 | 1 |
| 26 | 36 | 1 |
| 27 | 36 | 1 |
| 28 | 36 | 1 |
| 29 | 36 | 2 |
| 30 | 37 | 2 |
| 31 | 37 | 2 |
Humidity in October
Most of October feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, October lands in the dry band about 92% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 77 | 78 | 79 | 81 | 82 | 83 | 85 | 86 | 87 | 89 | 90 | 91 | 92 | 93 | 93 | 94 | 95 | 96 | 97 | 97 | 98 | 98 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 |
| Comfortable (%) | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 9 | 9 | 8 | 7 | 6 | 6 | 5 | 5 | 4 | 3 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Humid (%) | 4 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| 1 | 77 | 19 | 4 |
| 2 | 78 | 18 | 4 |
| 3 | 79 | 17 | 4 |
| 4 | 81 | 16 | 3 |
| 5 | 82 | 15 | 3 |
| 6 | 83 | 14 | 3 |
| 7 | 85 | 13 | 2 |
| 8 | 86 | 12 | 2 |
| 9 | 87 | 11 | 2 |
| 10 | 89 | 9 | 2 |
| 11 | 90 | 9 | 1 |
| 12 | 91 | 8 | 1 |
| 13 | 92 | 7 | 1 |
| 14 | 93 | 6 | 1 |
| 15 | 93 | 6 | 1 |
| 16 | 94 | 5 | 1 |
| 17 | 95 | 5 | 0 |
| 18 | 96 | 4 | 0 |
| 19 | 97 | 3 | 0 |
| 20 | 97 | 3 | 0 |
| 21 | 98 | 2 | 0 |
| 22 | 98 | 2 | 0 |
| 23 | 99 | 1 | 0 |
| 24 | 99 | 1 | 0 |
| 25 | 99 | 1 | 0 |
| 26 | 99 | 1 | 0 |
| 27 | 99 | 1 | 0 |
| 28 | 99 | 1 | 0 |
| 29 | 99 | 1 | 0 |
| 30 | 99 | 1 | 0 |
| 31 | 99 | 1 | 0 |
Wind in October
Winds average 9 km/h in October.
Across October, daily wind ranges from about 9 km/h on the calmest days to 10 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 9 | calm |
| 2 | 9 | calm |
| 3 | 9 | calm |
| 4 | 9 | calm |
| 5 | 9 | calm |
| 6 | 9 | calm |
| 7 | 9 | calm |
| 8 | 9 | calm |
| 9 | 9 | calm |
| 10 | 9 | calm |
| 11 | 9 | calm |
| 12 | 9 | calm |
| 13 | 9 | calm |
| 14 | 9 | calm |
| 15 | 9 | calm |
| 16 | 9 | calm |
| 17 | 9 | calm |
| 18 | 9 | calm |
| 19 | 9 | calm |
| 20 | 9 | calm |
| 21 | 9 | calm |
| 22 | 9 | calm |
| 23 | 9 | calm |
| 24 | 9 | calm |
| 25 | 10 | calm |
| 26 | 10 | calm |
| 27 | 10 | calm |
| 28 | 10 | calm |
| 29 | 10 | calm |
| 30 | 10 | calm |
| 31 | 10 | calm |
Sunrise & sunset in October
Daylight runs from about 11 h 36 min at the start of October to 10 h 18 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 78 minutes over October. Sunrise moves from 5:37 AM to 6:10 AM, and sunset from 5:12 PM to 4:28 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.6 | 11.5 | 11.5 | 11.5 | 11.4 | 11.4 | 11.3 | 11.3 | 11.2 | 11.2 | 11.1 | 11.1 | 11.1 | 11.0 | 11.0 | 10.9 | 10.9 | 10.8 | 10.8 | 10.8 | 10.7 | 10.7 | 10.6 | 10.6 | 10.6 | 10.5 | 10.5 | 10.4 | 10.4 | 10.4 | 10.3 |
| Sunrise (AM) | 5:37 | 5:38 | 5:39 | 5:40 | 5:41 | 5:42 | 5:43 | 5:44 | 5:45 | 5:46 | 5:47 | 5:48 | 5:49 | 5:51 | 5:52 | 5:53 | 5:54 | 5:55 | 5:56 | 5:57 | 5:58 | 5:59 | 6:00 | 6:02 | 6:03 | 6:04 | 6:05 | 6:06 | 6:07 | 6:08 | 6:10 |
| Sunset (PM) | 5:12 | 5:10 | 5:09 | 5:07 | 5:05 | 5:04 | 5:02 | 5:01 | 4:59 | 4:57 | 4:56 | 4:54 | 4:53 | 4:51 | 4:50 | 4:48 | 4:47 | 4:45 | 4:44 | 4:43 | 4:41 | 4:40 | 4:38 | 4:37 | 4:36 | 4:35 | 4:33 | 4:32 | 4:31 | 4:30 | 4:28 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.6 | 5:37 | 5:12 |
| 2 | 11.5 | 5:38 | 5:10 |
| 3 | 11.5 | 5:39 | 5:09 |
| 4 | 11.5 | 5:40 | 5:07 |
| 5 | 11.4 | 5:41 | 5:05 |
| 6 | 11.4 | 5:42 | 5:04 |
| 7 | 11.3 | 5:43 | 5:02 |
| 8 | 11.3 | 5:44 | 5:01 |
| 9 | 11.2 | 5:45 | 4:59 |
| 10 | 11.2 | 5:46 | 4:57 |
| 11 | 11.1 | 5:47 | 4:56 |
| 12 | 11.1 | 5:48 | 4:54 |
| 13 | 11.1 | 5:49 | 4:53 |
| 14 | 11.0 | 5:51 | 4:51 |
| 15 | 11.0 | 5:52 | 4:50 |
| 16 | 10.9 | 5:53 | 4:48 |
| 17 | 10.9 | 5:54 | 4:47 |
| 18 | 10.8 | 5:55 | 4:45 |
| 19 | 10.8 | 5:56 | 4:44 |
| 20 | 10.8 | 5:57 | 4:43 |
| 21 | 10.7 | 5:58 | 4:41 |
| 22 | 10.7 | 5:59 | 4:40 |
| 23 | 10.6 | 6:00 | 4:38 |
| 24 | 10.6 | 6:02 | 4:37 |
| 25 | 10.6 | 6:03 | 4:36 |
| 26 | 10.5 | 6:04 | 4:35 |
| 27 | 10.5 | 6:05 | 4:33 |
| 28 | 10.4 | 6:06 | 4:32 |
| 29 | 10.4 | 6:07 | 4:31 |
| 30 | 10.4 | 6:08 | 4:30 |
| 31 | 10.3 | 6:10 | 4:28 |
Solar energy in October
Average shortwave solar energy reaching the ground each day in October, about 2.94 kWh/m².
For context, solar energy here swings from a low near 1.87 kWh/m² to a high of 5.27 kWh/m² in May across the year — October's 2.94 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.3 | 3.2 | 3.2 | 3.2 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 2.9 | 2.9 | 2.9 | 2.9 | 2.8 | 2.8 | 2.8 | 2.8 | 2.7 | 2.7 | 2.7 | 2.6 | 2.6 | 2.6 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 3.3 | Moderate |
| 2 | 3.2 | Moderate |
| 3 | 3.2 | Moderate |
| 4 | 3.2 | Moderate |
| 5 | 3.1 | Moderate |
| 6 | 3.1 | Moderate |
| 7 | 3.1 | Moderate |
| 8 | 3.1 | Moderate |
| 9 | 3.1 | Moderate |
| 10 | 3.1 | Moderate |
| 11 | 3.0 | Moderate |
| 12 | 3.0 | Moderate |
| 13 | 3.0 | Moderate |
| 14 | 3.0 | Moderate |
| 15 | 3.0 | Moderate |
| 16 | 3.0 | Moderate |
| 17 | 3.0 | Moderate |
| 18 | 2.9 | Moderate |
| 19 | 2.9 | Moderate |
| 20 | 2.9 | Moderate |
| 21 | 2.9 | Moderate |
| 22 | 2.8 | Moderate |
| 23 | 2.8 | Moderate |
| 24 | 2.8 | Moderate |
| 25 | 2.8 | Moderate |
| 26 | 2.7 | Moderate |
| 27 | 2.7 | Moderate |
| 28 | 2.7 | Moderate |
| 29 | 2.6 | Moderate |
| 30 | 2.6 | Moderate |
| 31 | 2.6 | Moderate |
Is October a good time to visit Hachimantai?
Our two travel scores rate October for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
October is a reasonable time to visit Hachimantai for sightseeing.
What to pack for Hachimantai in October
From October's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In October, Hachimantai sees daytime highs around 15°C and nights near 7°C. Worth packing: a warm layer and rain gear. About 11 days see rain.
Sea temperature near Hachimantai in October
The nearest coast averages about 18°C in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 68 km away) is warmest in August at about 21°C and coldest in March near 6°C.
It's comfortable for a long swim from Aug 8 to Sep 25 — about 1.6 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 10 | 8 | 6 | 7 | 10 | 14 | 18 | 21 | 21 | 18 | 15 | 12 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 10 | Bracing |
| Feb | 8 | Bracing |
| Mar | 6 | Bracing |
| Apr | 7 | Bracing |
| May | 10 | Bracing |
| Jun | 14 | Bracing |
| Jul | 18 | Cool |
| Aug | 21 | Refreshing |
| Sep | 21 | Refreshing |
| Oct | 18 | Cool |
| Nov | 15 | Cool |
| Dec | 12 | Bracing |
UV index in Hachimantai in October
Clear-sky midday UV in October peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Hachimantai peaks around August 18 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (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) | 2 | 3 | 4 | 6 | 8 | 8 | 6 | 9 | 7 | 5 | 2 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | High | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 8 | Very high |
| Jul | 6 | High |
| Aug | 9 | Very high |
| Sep | 7 | High |
| Oct | 5 | Moderate |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
Air quality in Hachimantai in October
Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.
Air quality in Hachimantai is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.1× 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 | 14 | 19 | 20 | 19 | 14 | 12 | 11 | 11 | 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 | 14 | Moderate |
| Mar | 19 | Moderate |
| Apr | 20 | Moderate |
| May | 19 | Moderate |
| Jun | 14 | Moderate |
| Jul | 12 | Moderate |
| Aug | 11 | Good |
| Sep | 11 | Good |
| Oct | 12 | Good |
| Nov | 11 | Good |
| Dec | 9 | Good |
Where is Hachimantai?
Hachimantai sits at 39.9°N, 141.1°E, 228 m above sea level, in Japan. The nearest listed city is Takizawa, 11 km away.
Topography around Hachimantai
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Hachimantai.
Within 3 km, the terrain around Hachimantai has only modest variations in elevation — a maximum elevation change of 149 m around an average of 245 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,870 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,117 m.
The land around Hachimantai is covered by cropland (46%) and trees (38%) within 3 km, trees (75%) within 16 km, and trees (84%) 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 Hachimantai (39.8998°, 141.1299°, elevation 228 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. 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).