Shiroishi weather in October
In October, Shiroishi sees average daytime highs of 18°C and overnight lows near 10°C, with 135 mm of rain across 11.5 wet days and about 11 hours of daylight. It is the 6th-warmest and 4th-wettest month of the year here.
Highs ease over the month, from about 20°C in the first days to 15°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 24 min by month's end. Set against the rest of the year, October is Shiroishi's 4th-clearest and 8th-windiest month. For the whole year in context, see Shiroishi's year-round climate.
- Daytime high
- 18°
- 6th warmest
- Overnight low
- 10°
- 7th coldest
- Rainfall
- 135 mm
- 11.5 wet days
- Daylight
- 11 hours
- 5:53 AM – 4:52 PM
- Cloud cover
- 65%
- 4th clearest
- Wind
- 7 km/h
- 8th windiest
- Solar energy
- 2.91 kWh/m²
- Travel score
- 5.4
- out of 10
Shiroishi is city in Miyagi Prefecture, Japan.
- Density
- 116/km²
- people per km²
- Founded
- 1954
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in October
Highs ease over the month, from about 20°C in the first days to 15°C by the end.
A typical October day in Shiroishi reaches about 18°C in the afternoon and slips back to 10°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 21°C. Set against its neighbours, October runs about 6°C cooler than September and about 6°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) | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 |
| Avg low (°C) | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 6 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 20 | 13 |
| 2 | 20 | 13 |
| 3 | 20 | 13 |
| 4 | 20 | 12 |
| 5 | 20 | 12 |
| 6 | 19 | 12 |
| 7 | 19 | 12 |
| 8 | 19 | 11 |
| 9 | 19 | 11 |
| 10 | 19 | 11 |
| 11 | 19 | 11 |
| 12 | 18 | 11 |
| 13 | 18 | 10 |
| 14 | 18 | 10 |
| 15 | 18 | 10 |
| 16 | 18 | 10 |
| 17 | 17 | 9 |
| 18 | 17 | 9 |
| 19 | 17 | 9 |
| 20 | 17 | 9 |
| 21 | 17 | 9 |
| 22 | 17 | 8 |
| 23 | 16 | 8 |
| 24 | 16 | 8 |
| 25 | 16 | 8 |
| 26 | 16 | 8 |
| 27 | 16 | 7 |
| 28 | 15 | 7 |
| 29 | 15 | 7 |
| 30 | 15 | 7 |
| 31 | 15 | 6 |
How October really feels in Shiroishi
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.
Shiroishi 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 | 3° / -4° | 78 | 14.5 | 15 | 9.7 | 0.0 |
| Feb | 4° / -4° | 58 | 11.9 | 11.7 | 10.5 | 0.0 |
| Mar | 8° / -1° | 92 | 13.4 | 8.2 | 11.7 | 1.0 |
| Apr | 14° / 4° | 95 | 12.5 | 1.8 | 13 | 3.8 |
| May | 19° / 10° | 98 | 12.4 | 0 | 14 | 5.7 |
| Jun | 22° / 15° | 126 | 13.6 | 0 | 14.6 | 5.8 |
| Jul | 26° / 19° | 188 | 18.2 | 0 | 14.4 | 5.2 |
| Aug | 27° / 20° | 160 | 15.8 | 0 | 13.5 | 5.5 |
| Sep | 23° / 16° | 153 | 14 | 0 | 12.3 | 5.8 |
| Oct | 18° / 10° | 135 | 11.5 | 0 | 11 | 5.4 |
| Nov | 12° / 3° | 71 | 11.6 | 2 | 9.9 | 2.9 |
| Dec | 6° / -1° | 69 | 14.5 | 10.1 | 9.4 | 0.3 |
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 (%) | 33 | 33 | 35 | 36 | 37 | 38 | 38 | 38 | 40 | 40 | 40 | 42 | 42 | 43 | 44 | 44 | 44 | 45 | 45 | 46 | 47 | 47 | 48 | 49 | 49 | 51 | 52 | 53 | 53 | 54 | 55 |
| Cloudier (%) | 67 | 67 | 65 | 64 | 63 | 62 | 62 | 62 | 60 | 60 | 60 | 58 | 58 | 57 | 56 | 56 | 56 | 55 | 55 | 54 | 53 | 53 | 52 | 51 | 51 | 49 | 48 | 47 | 47 | 46 | 45 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 33 | 67 |
| 2 | 33 | 67 |
| 3 | 35 | 65 |
| 4 | 36 | 64 |
| 5 | 37 | 63 |
| 6 | 38 | 62 |
| 7 | 38 | 62 |
| 8 | 38 | 62 |
| 9 | 40 | 60 |
| 10 | 40 | 60 |
| 11 | 40 | 60 |
| 12 | 42 | 58 |
| 13 | 42 | 58 |
| 14 | 43 | 57 |
| 15 | 44 | 56 |
| 16 | 44 | 56 |
| 17 | 44 | 56 |
| 18 | 45 | 55 |
| 19 | 45 | 55 |
| 20 | 46 | 54 |
| 21 | 47 | 53 |
| 22 | 47 | 53 |
| 23 | 48 | 52 |
| 24 | 49 | 51 |
| 25 | 49 | 51 |
| 26 | 51 | 49 |
| 27 | 52 | 48 |
| 28 | 53 | 47 |
| 29 | 53 | 47 |
| 30 | 54 | 46 |
| 31 | 55 | 45 |
Chance of precipitation in October
Shiroishi gets around 135 mm of rain over 11.5 wet days in October. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 37% and peaks near 41% 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 41 | 41 | 41 | 40 | 40 | 39 | 39 | 38 | 38 | 37 | 36 | 36 | 35 | 35 | 34 | 34 | 34 | 34 | 34 | 35 | 35 | 35 | 36 | 36 | 37 | 37 | 37 | 37 | 37 | 37 | 37 |
| Rain chance (%) | |
|---|---|
| 1 | 41 |
| 2 | 41 |
| 3 | 41 |
| 4 | 40 |
| 5 | 40 |
| 6 | 39 |
| 7 | 39 |
| 8 | 38 |
| 9 | 38 |
| 10 | 37 |
| 11 | 36 |
| 12 | 36 |
| 13 | 35 |
| 14 | 35 |
| 15 | 34 |
| 16 | 34 |
| 17 | 34 |
| 18 | 34 |
| 19 | 34 |
| 20 | 35 |
| 21 | 35 |
| 22 | 35 |
| 23 | 36 |
| 24 | 36 |
| 25 | 37 |
| 26 | 37 |
| 27 | 37 |
| 28 | 37 |
| 29 | 37 |
| 30 | 37 |
| 31 | 37 |
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 79% 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 (%) | 47 | 49 | 51 | 52 | 55 | 58 | 59 | 62 | 64 | 68 | 70 | 74 | 76 | 80 | 82 | 83 | 86 | 88 | 89 | 91 | 92 | 93 | 95 | 96 | 96 | 96 | 97 | 97 | 98 | 98 | 98 |
| Comfortable (%) | 36 | 36 | 35 | 35 | 34 | 32 | 31 | 29 | 28 | 25 | 23 | 21 | 19 | 16 | 14 | 13 | 11 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 |
| Humid (%) | 14 | 13 | 12 | 11 | 10 | 9 | 9 | 8 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 |
| Muggy (%) | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 47 | 36 | 14 | 3 |
| 2 | 49 | 36 | 13 | 2 |
| 3 | 51 | 35 | 12 | 2 |
| 4 | 52 | 35 | 11 | 2 |
| 5 | 55 | 34 | 10 | 1 |
| 6 | 58 | 32 | 9 | 1 |
| 7 | 59 | 31 | 9 | 1 |
| 8 | 62 | 29 | 8 | 1 |
| 9 | 64 | 28 | 7 | 1 |
| 10 | 68 | 25 | 6 | 1 |
| 11 | 70 | 23 | 6 | 1 |
| 12 | 74 | 21 | 5 | 0 |
| 13 | 76 | 19 | 5 | 0 |
| 14 | 80 | 16 | 4 | 0 |
| 15 | 82 | 14 | 4 | 0 |
| 16 | 83 | 13 | 4 | 0 |
| 17 | 86 | 11 | 3 | 0 |
| 18 | 88 | 9 | 3 | 0 |
| 19 | 89 | 8 | 3 | 0 |
| 20 | 91 | 7 | 2 | 0 |
| 21 | 92 | 6 | 2 | 0 |
| 22 | 93 | 5 | 2 | 0 |
| 23 | 95 | 4 | 1 | 0 |
| 24 | 96 | 3 | 1 | 0 |
| 25 | 96 | 3 | 1 | 0 |
| 26 | 96 | 3 | 1 | 0 |
| 27 | 97 | 2 | 1 | 0 |
| 28 | 97 | 2 | 1 | 0 |
| 29 | 98 | 2 | 0 | 0 |
| 30 | 98 | 2 | 0 | 0 |
| 31 | 98 | 2 | 0 | 0 |
Wind in October
Winds average 7 km/h in October.
Across October, daily wind ranges from about 7 km/h on the calmest days to 8 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) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| 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 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 8 | calm |
| 24 | 8 | calm |
| 25 | 8 | calm |
| 26 | 8 | calm |
| 27 | 8 | calm |
| 28 | 8 | calm |
| 29 | 8 | calm |
| 30 | 8 | calm |
| 31 | 8 | calm |
Sunrise & sunset in October
Daylight runs from about 11 h 36 min at the start of October to 10 h 24 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 72 minutes over October. Sunrise moves from 5:38 AM to 6:08 AM, and sunset from 5:15 PM to 4:34 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 | 11.6 | 11.5 | 11.5 | 11.4 | 11.4 | 11.4 | 11.3 | 11.3 | 11.2 | 11.2 | 11.2 | 11.1 | 11.1 | 11.0 | 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 | 10.5 | 10.4 |
| Sunrise (AM) | 5:38 | 5:39 | 5:40 | 5:41 | 5:42 | 5:43 | 5:44 | 5:45 | 5:46 | 5:47 | 5:48 | 5:49 | 5:50 | 5:51 | 5:52 | 5:53 | 5:54 | 5:55 | 5:56 | 5:57 | 5:58 | 5:59 | 6:00 | 6:01 | 6:02 | 6:03 | 6:04 | 6:05 | 6:06 | 6:07 | 6:08 |
| Sunset (PM) | 5:15 | 5:13 | 5:12 | 5:10 | 5:09 | 5:07 | 5:06 | 5:04 | 5:03 | 5:01 | 5:00 | 4:58 | 4:57 | 4:55 | 4:54 | 4:52 | 4:51 | 4:50 | 4:48 | 4:47 | 4:46 | 4:45 | 4:43 | 4:42 | 4:41 | 4:40 | 4:38 | 4:37 | 4:36 | 4:35 | 4:34 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.6 | 5:38 | 5:15 |
| 2 | 11.6 | 5:39 | 5:13 |
| 3 | 11.5 | 5:40 | 5:12 |
| 4 | 11.5 | 5:41 | 5:10 |
| 5 | 11.4 | 5:42 | 5:09 |
| 6 | 11.4 | 5:43 | 5:07 |
| 7 | 11.4 | 5:44 | 5:06 |
| 8 | 11.3 | 5:45 | 5:04 |
| 9 | 11.3 | 5:46 | 5:03 |
| 10 | 11.2 | 5:47 | 5:01 |
| 11 | 11.2 | 5:48 | 5:00 |
| 12 | 11.2 | 5:49 | 4:58 |
| 13 | 11.1 | 5:50 | 4:57 |
| 14 | 11.1 | 5:51 | 4:55 |
| 15 | 11.0 | 5:52 | 4:54 |
| 16 | 11.0 | 5:53 | 4:52 |
| 17 | 11.0 | 5:54 | 4:51 |
| 18 | 10.9 | 5:55 | 4:50 |
| 19 | 10.9 | 5:56 | 4:48 |
| 20 | 10.8 | 5:57 | 4:47 |
| 21 | 10.8 | 5:58 | 4:46 |
| 22 | 10.8 | 5:59 | 4:45 |
| 23 | 10.7 | 6:00 | 4:43 |
| 24 | 10.7 | 6:01 | 4:42 |
| 25 | 10.6 | 6:02 | 4:41 |
| 26 | 10.6 | 6:03 | 4:40 |
| 27 | 10.6 | 6:04 | 4:38 |
| 28 | 10.5 | 6:05 | 4:37 |
| 29 | 10.5 | 6:06 | 4:36 |
| 30 | 10.5 | 6:07 | 4:35 |
| 31 | 10.4 | 6:08 | 4:34 |
Solar energy in October
Average shortwave solar energy reaching the ground each day in October, about 2.91 kWh/m².
For context, solar energy here swings from a low near 2.03 kWh/m² to a high of 5.33 kWh/m² in May across the year — October's 2.91 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) | 3.2 | 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 | 3.0 | 3.0 | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.7 | 2.7 | 2.7 | 2.7 | 2.7 |
| 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 | 3.2 | Moderate |
| 2 | 3.1 | Moderate |
| 3 | 3.1 | Moderate |
| 4 | 3.1 | Moderate |
| 5 | 3.1 | Moderate |
| 6 | 3.1 | Moderate |
| 7 | 3.1 | Moderate |
| 8 | 3.0 | Moderate |
| 9 | 3.0 | Moderate |
| 10 | 3.0 | 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 | 2.9 | 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 | 2.8 | Moderate |
| 27 | 2.7 | Moderate |
| 28 | 2.7 | Moderate |
| 29 | 2.7 | Moderate |
| 30 | 2.7 | Moderate |
| 31 | 2.7 | Moderate |
Hazard calendar for Shiroishi
In October, Shiroishi sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Shiroishi sits in the Pacific typhoon belt; the season peaks July–October.
Is October a good time to visit Shiroishi?
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 Shiroishi for sightseeing.
What to pack for Shiroishi in October
From October's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In October, Shiroishi sees daytime highs around 18°C and nights near 10°C. Worth packing: rain gear. About 12 days see rain.
Sea temperature near Shiroishi in October
The nearest coast averages about 19°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 46 km away) is warmest in August at about 24°C and coldest in March near 9°C.
It's comfortable for a long swim from Jul 7 to Oct 10 — about 3.2 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 11 | 9 | 9 | 10 | 14 | 18 | 21 | 24 | 23 | 19 | 17 | 14 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 11 | Bracing |
| Feb | 9 | Bracing |
| Mar | 9 | Bracing |
| Apr | 10 | Bracing |
| May | 14 | Bracing |
| Jun | 18 | Cool |
| Jul | 21 | Refreshing |
| Aug | 24 | Refreshing |
| Sep | 23 | Refreshing |
| Oct | 19 | Cool |
| Nov | 17 | Cool |
| Dec | 14 | Bracing |
UV index in Shiroishi 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 Shiroishi peaks around August 13 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 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 | 9 | 9 | 8 | 5 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | Very high | High | 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 | 9 | Very high |
| Aug | 9 | Very high |
| Sep | 8 | Very high |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Shiroishi 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 Shiroishi is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 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) | 11 | 14 | 21 | 22 | 21 | 16 | 14 | 12 | 12 | 12 | 11 | 10 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 14 | Moderate |
| Mar | 21 | Moderate |
| Apr | 22 | Moderate |
| May | 21 | Moderate |
| Jun | 16 | Moderate |
| Jul | 14 | Moderate |
| Aug | 12 | Moderate |
| Sep | 12 | Good |
| Oct | 12 | Good |
| Nov | 11 | Good |
| Dec | 10 | Good |
Where is Shiroishi?
Shiroishi sits at 38.0°N, 140.6°E, 57 m above sea level, in Japan. The nearest listed city is Ōkawara, 11 km away.
Topography around Shiroishi
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Shiroishi.
Within 3 km, the terrain around Shiroishi has significant variations in elevation — a maximum elevation change of 493 m around an average of 100 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,805 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,031 m.
The land around Shiroishi is covered by trees (50%), cropland (23%) and artificial surfaces (23%) within 3 km, trees (80%) within 16 km, and trees (63%) and water (20%) 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 Shiroishi (38.0033°, 140.6183°, elevation 57 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).