Shiroishi weather in August
In August, Shiroishi sees average daytime highs of 27°C and overnight lows near 20°C, with 160 mm of rain across 15.8 wet days and about 13.5 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.
Highs ease over the month, from about 28°C in the first days to 26°C by the end. The sky is clear or mostly clear about 16% of the time in August, and the air most often feels muggy.
Daylight stretches from about 14 hours at the start of August to 12 h 54 min by month's end. Set against the rest of the year, August is Shiroishi's 9th-clearest and 11th-windiest month. For the whole year in context, see Shiroishi's year-round climate.
- Daytime high
- 27°
- 1st warmest
- Overnight low
- 20°
- 12th coldest
- Rainfall
- 160 mm
- 15.8 wet days
- Daylight
- 13 h 30 min
- 4:57 AM – 6:26 PM
- Cloud cover
- 72%
- 9th clearest
- Wind
- 5 km/h
- 11th windiest
- Solar energy
- 4.27 kWh/m²
- Travel score
- 5.5
- 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 August
Highs ease over the month, from about 28°C in the first days to 26°C by the end.
A typical August day in Shiroishi reaches about 27°C in the afternoon and slips back to 20°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 32°C. Set against its neighbours, August runs about 1°C warmer than July and about 4°C warmer than September.
| 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) | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
| Avg low (°C) | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 28 | 21 |
| 2 | 28 | 21 |
| 3 | 28 | 21 |
| 4 | 28 | 21 |
| 5 | 28 | 21 |
| 6 | 28 | 21 |
| 7 | 28 | 21 |
| 8 | 28 | 21 |
| 9 | 28 | 21 |
| 10 | 28 | 21 |
| 11 | 28 | 21 |
| 12 | 28 | 21 |
| 13 | 27 | 21 |
| 14 | 27 | 21 |
| 15 | 27 | 21 |
| 16 | 27 | 21 |
| 17 | 27 | 20 |
| 18 | 27 | 20 |
| 19 | 27 | 20 |
| 20 | 27 | 20 |
| 21 | 27 | 20 |
| 22 | 27 | 20 |
| 23 | 27 | 20 |
| 24 | 27 | 20 |
| 25 | 26 | 20 |
| 26 | 26 | 20 |
| 27 | 26 | 20 |
| 28 | 26 | 19 |
| 29 | 26 | 19 |
| 30 | 26 | 19 |
| 31 | 26 | 19 |
How August really feels in Shiroishi
Once humidity and wind are folded in, August 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.
August 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 August compares with the rest of the year at a glance. August is the 1st-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 | 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 August
The sky is clear or mostly clear about 16% of the time in August.
Beyond those clear spells, partly cloudy skies cover about 14% of August, with mostly cloudy or overcast conditions the remaining 70%.
| 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 (%) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 30 | 30 | 29 | 28 | 28 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 30 | 30 | 31 | 31 |
| Cloudier (%) | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 71 | 70 | 70 | 71 | 72 | 72 | 71 | 71 | 71 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 71 | 70 | 70 | 69 | 69 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 30 | 70 |
| 2 | 30 | 70 |
| 3 | 30 | 70 |
| 4 | 30 | 70 |
| 5 | 30 | 70 |
| 6 | 30 | 70 |
| 7 | 30 | 70 |
| 8 | 30 | 70 |
| 9 | 30 | 70 |
| 10 | 30 | 70 |
| 11 | 29 | 71 |
| 12 | 30 | 70 |
| 13 | 30 | 70 |
| 14 | 29 | 71 |
| 15 | 28 | 72 |
| 16 | 28 | 72 |
| 17 | 29 | 71 |
| 18 | 29 | 71 |
| 19 | 29 | 71 |
| 20 | 30 | 70 |
| 21 | 30 | 70 |
| 22 | 30 | 70 |
| 23 | 30 | 70 |
| 24 | 30 | 70 |
| 25 | 30 | 70 |
| 26 | 30 | 70 |
| 27 | 29 | 71 |
| 28 | 30 | 70 |
| 29 | 30 | 70 |
| 30 | 31 | 69 |
| 31 | 31 | 69 |
Chance of precipitation in August
Shiroishi gets around 160 mm of rain over 15.8 wet days in August. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 51% and peaks near 52% 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 (%) | 50 | 50 | 50 | 50 | 49 | 49 | 50 | 50 | 50 | 50 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 52 | 52 | 52 | 52 | 52 | 52 | 51 | 51 | 51 | 51 |
| Rain chance (%) | |
|---|---|
| 1 | 50 |
| 2 | 50 |
| 3 | 50 |
| 4 | 50 |
| 5 | 49 |
| 6 | 49 |
| 7 | 50 |
| 8 | 50 |
| 9 | 50 |
| 10 | 50 |
| 11 | 51 |
| 12 | 51 |
| 13 | 51 |
| 14 | 51 |
| 15 | 51 |
| 16 | 51 |
| 17 | 51 |
| 18 | 51 |
| 19 | 51 |
| 20 | 51 |
| 21 | 51 |
| 22 | 52 |
| 23 | 52 |
| 24 | 52 |
| 25 | 52 |
| 26 | 52 |
| 27 | 52 |
| 28 | 51 |
| 29 | 51 |
| 30 | 51 |
| 31 | 51 |
Humidity in August
Most of August feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, August lands in the muggy band about 39% of days. Sticky, muggy-or-worse air turns up on roughly 77% 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 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 | 1 | 1 | 1 | 1 | 1 | 1 |
| Comfortable (%) | 4 | 4 | 4 | 4 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 9 | 9 |
| Humid (%) | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 16 | 16 | 17 | 17 | 18 | 20 | 21 | 22 | 23 | 25 | 26 | 27 | 29 | 30 |
| Muggy (%) | 42 | 41 | 40 | 40 | 39 | 39 | 38 | 38 | 38 | 38 | 38 | 38 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 38 | 38 |
| Oppressive (%) | 41 | 43 | 43 | 44 | 44 | 45 | 45 | 45 | 44 | 44 | 44 | 43 | 42 | 42 | 41 | 40 | 40 | 39 | 38 | 37 | 36 | 35 | 34 | 32 | 31 | 29 | 28 | 26 | 25 | 23 | 22 |
| Miserable (%) | 1 | 1 | 1 | 1 | 1 | 1 | 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 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 0 | 4 | 12 | 42 | 41 | 1 |
| 2 | 0 | 4 | 12 | 41 | 43 | 1 |
| 3 | 0 | 4 | 12 | 40 | 43 | 1 |
| 4 | 0 | 4 | 12 | 40 | 44 | 1 |
| 5 | 0 | 3 | 12 | 39 | 44 | 1 |
| 6 | 0 | 3 | 13 | 39 | 45 | 1 |
| 7 | 0 | 4 | 13 | 38 | 45 | 1 |
| 8 | 0 | 4 | 13 | 38 | 45 | 1 |
| 9 | 0 | 4 | 13 | 38 | 44 | 1 |
| 10 | 0 | 4 | 14 | 38 | 44 | 1 |
| 11 | 0 | 4 | 14 | 38 | 44 | 1 |
| 12 | 0 | 4 | 14 | 38 | 43 | 1 |
| 13 | 0 | 4 | 14 | 39 | 42 | 1 |
| 14 | 0 | 4 | 14 | 39 | 42 | 0 |
| 15 | 0 | 4 | 15 | 39 | 41 | 0 |
| 16 | 0 | 5 | 15 | 39 | 40 | 0 |
| 17 | 0 | 5 | 15 | 39 | 40 | 0 |
| 18 | 0 | 6 | 16 | 39 | 39 | 0 |
| 19 | 1 | 6 | 16 | 39 | 38 | 0 |
| 20 | 1 | 6 | 17 | 39 | 37 | 0 |
| 21 | 1 | 7 | 17 | 39 | 36 | 0 |
| 22 | 1 | 7 | 18 | 39 | 35 | 0 |
| 23 | 1 | 7 | 20 | 39 | 34 | 0 |
| 24 | 1 | 7 | 21 | 39 | 32 | 0 |
| 25 | 1 | 7 | 22 | 39 | 31 | 0 |
| 26 | 1 | 8 | 23 | 39 | 29 | 0 |
| 27 | 1 | 8 | 25 | 39 | 28 | 0 |
| 28 | 1 | 8 | 26 | 39 | 26 | 0 |
| 29 | 1 | 8 | 27 | 39 | 25 | 0 |
| 30 | 1 | 9 | 29 | 38 | 23 | 0 |
| 31 | 1 | 9 | 30 | 38 | 22 | 0 |
Wind in August
Winds average 5 km/h in August.
Across August, daily wind ranges from about 5 km/h on the calmest days to 6 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) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 |
| 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 | 5 | calm |
| 2 | 5 | calm |
| 3 | 5 | calm |
| 4 | 5 | calm |
| 5 | 5 | calm |
| 6 | 5 | calm |
| 7 | 5 | calm |
| 8 | 5 | calm |
| 9 | 5 | calm |
| 10 | 5 | calm |
| 11 | 5 | calm |
| 12 | 5 | calm |
| 13 | 5 | calm |
| 14 | 5 | calm |
| 15 | 5 | calm |
| 16 | 5 | calm |
| 17 | 5 | calm |
| 18 | 5 | calm |
| 19 | 5 | calm |
| 20 | 5 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 6 | calm |
| 27 | 6 | calm |
| 28 | 6 | calm |
| 29 | 6 | calm |
| 30 | 6 | calm |
| 31 | 6 | calm |
Sunrise & sunset in August
Daylight runs from about 14 hours at the start of August to 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 66 minutes over August. Sunrise moves from 4:44 AM to 5:11 AM, and sunset from 6:43 PM to 6:05 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) | 14.0 | 14.0 | 13.9 | 13.9 | 13.9 | 13.8 | 13.8 | 13.8 | 13.7 | 13.7 | 13.7 | 13.6 | 13.6 | 13.6 | 13.5 | 13.5 | 13.4 | 13.4 | 13.4 | 13.3 | 13.3 | 13.3 | 13.2 | 13.2 | 13.1 | 13.1 | 13.1 | 13.0 | 13.0 | 12.9 | 12.9 |
| Sunrise (AM) | 4:44 | 4:45 | 4:46 | 4:47 | 4:47 | 4:48 | 4:49 | 4:50 | 4:51 | 4:52 | 4:53 | 4:54 | 4:54 | 4:55 | 4:56 | 4:57 | 4:58 | 4:59 | 5:00 | 5:01 | 5:02 | 5:03 | 5:03 | 5:04 | 5:05 | 5:06 | 5:07 | 5:08 | 5:09 | 5:10 | 5:11 |
| Sunset (PM) | 6:43 | 6:42 | 6:41 | 6:40 | 6:39 | 6:38 | 6:37 | 6:36 | 6:35 | 6:34 | 6:32 | 6:31 | 6:30 | 6:29 | 6:27 | 6:26 | 6:25 | 6:23 | 6:22 | 6:21 | 6:19 | 6:18 | 6:16 | 6:15 | 6:14 | 6:12 | 6:11 | 6:09 | 6:08 | 6:06 | 6:05 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 14.0 | 4:44 | 6:43 |
| 2 | 14.0 | 4:45 | 6:42 |
| 3 | 13.9 | 4:46 | 6:41 |
| 4 | 13.9 | 4:47 | 6:40 |
| 5 | 13.9 | 4:47 | 6:39 |
| 6 | 13.8 | 4:48 | 6:38 |
| 7 | 13.8 | 4:49 | 6:37 |
| 8 | 13.8 | 4:50 | 6:36 |
| 9 | 13.7 | 4:51 | 6:35 |
| 10 | 13.7 | 4:52 | 6:34 |
| 11 | 13.7 | 4:53 | 6:32 |
| 12 | 13.6 | 4:54 | 6:31 |
| 13 | 13.6 | 4:54 | 6:30 |
| 14 | 13.6 | 4:55 | 6:29 |
| 15 | 13.5 | 4:56 | 6:27 |
| 16 | 13.5 | 4:57 | 6:26 |
| 17 | 13.4 | 4:58 | 6:25 |
| 18 | 13.4 | 4:59 | 6:23 |
| 19 | 13.4 | 5:00 | 6:22 |
| 20 | 13.3 | 5:01 | 6:21 |
| 21 | 13.3 | 5:02 | 6:19 |
| 22 | 13.3 | 5:03 | 6:18 |
| 23 | 13.2 | 5:03 | 6:16 |
| 24 | 13.2 | 5:04 | 6:15 |
| 25 | 13.1 | 5:05 | 6:14 |
| 26 | 13.1 | 5:06 | 6:12 |
| 27 | 13.1 | 5:07 | 6:11 |
| 28 | 13.0 | 5:08 | 6:09 |
| 29 | 13.0 | 5:09 | 6:08 |
| 30 | 12.9 | 5:10 | 6:06 |
| 31 | 12.9 | 5:11 | 6:05 |
Solar energy in August
Average shortwave solar energy reaching the ground each day in August, about 4.27 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 — August's 4.27 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) | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 3.9 | 3.9 | 3.9 | 3.8 |
| 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 | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.6 | Bright |
| 2 | 4.6 | Bright |
| 3 | 4.6 | Bright |
| 4 | 4.6 | Bright |
| 5 | 4.6 | Bright |
| 6 | 4.6 | Bright |
| 7 | 4.5 | Bright |
| 8 | 4.5 | Bright |
| 9 | 4.5 | Bright |
| 10 | 4.5 | Bright |
| 11 | 4.4 | Bright |
| 12 | 4.4 | Bright |
| 13 | 4.3 | Bright |
| 14 | 4.3 | Bright |
| 15 | 4.3 | Bright |
| 16 | 4.2 | Bright |
| 17 | 4.2 | Bright |
| 18 | 4.2 | Bright |
| 19 | 4.2 | Bright |
| 20 | 4.1 | Bright |
| 21 | 4.1 | Bright |
| 22 | 4.1 | Bright |
| 23 | 4.0 | Bright |
| 24 | 4.0 | Bright |
| 25 | 4.0 | Bright |
| 26 | 4.0 | Moderate |
| 27 | 4.0 | Moderate |
| 28 | 3.9 | Moderate |
| 29 | 3.9 | Moderate |
| 30 | 3.9 | Moderate |
| 31 | 3.8 | Moderate |
Hazard calendar for Shiroishi
In August, 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 August a good time to visit Shiroishi?
Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
August is a reasonable time to visit Shiroishi for sightseeing.
What to pack for Shiroishi in August
From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In August, Shiroishi sees daytime highs around 27°C and nights near 20°C. Pack light clothes and rain gear. About 16 days see rain.
Sea temperature near Shiroishi in August
The nearest coast averages about 24°C in August — 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 August
Clear-sky midday UV in August 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 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 August
Average fine-particle pollution (PM2.5) through the year — so you can see where August 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).