Yorii weather in August
In August, Yorii sees average daytime highs of 29°C and overnight lows near 23°C, with 180 mm of rain across 19.7 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 5th-wettest month of the year here.
Highs ease over the month, from about 30°C in the first days to 28°C by the end. The sky is clear or mostly clear about 18% of the time in August, and the air most often feels oppressive.
Daylight stretches from about 13 h 54 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Yorii's 9th-clearest and 11th-windiest month. For the whole year in context, see Yorii's year-round climate.
- Daytime high
- 29°
- 1st warmest
- Overnight low
- 23°
- 12th coldest
- Rainfall
- 180 mm
- 19.7 wet days
- Daylight
- 13 h 24 min
- 5:06 AM – 6:29 PM
- Cloud cover
- 69%
- 9th clearest
- Wind
- 5 km/h
- 11th windiest
- Solar energy
- 4.47 kWh/m²
- Travel score
- 4.2
- out of 10
Yorii is town in Ōsato district, Saitama prefecture, Japan.
- Density
- 511/km²
- people per km²
- Founded
- 1955
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in August
Highs ease over the month, from about 30°C in the first days to 28°C by the end.
A typical August day in Yorii reaches about 29°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 33°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) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 |
| Avg low (°C) | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 30 | 23 |
| 2 | 30 | 23 |
| 3 | 30 | 23 |
| 4 | 30 | 23 |
| 5 | 30 | 23 |
| 6 | 30 | 23 |
| 7 | 30 | 23 |
| 8 | 30 | 23 |
| 9 | 30 | 23 |
| 10 | 30 | 23 |
| 11 | 30 | 23 |
| 12 | 30 | 23 |
| 13 | 30 | 23 |
| 14 | 30 | 23 |
| 15 | 29 | 23 |
| 16 | 29 | 23 |
| 17 | 29 | 23 |
| 18 | 29 | 23 |
| 19 | 29 | 23 |
| 20 | 29 | 22 |
| 21 | 29 | 22 |
| 22 | 29 | 22 |
| 23 | 29 | 22 |
| 24 | 29 | 22 |
| 25 | 29 | 22 |
| 26 | 28 | 22 |
| 27 | 28 | 22 |
| 28 | 28 | 22 |
| 29 | 28 | 22 |
| 30 | 28 | 22 |
| 31 | 28 | 22 |
How August really feels in Yorii
Once humidity and wind are folded in, August averages 16 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Yorii weather by month
How August compares with the rest of the year at a glance. August is the 1st-warmest and 5th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 7° / -1° | 62 | 6.7 | 3.7 | 9.8 | 1.2 |
| Feb | 8° / -1° | 59 | 7.6 | 4.1 | 10.6 | 1.6 |
| Mar | 12° / 3° | 111 | 13 | 4.5 | 11.7 | 2.9 |
| Apr | 17° / 8° | 123 | 12.8 | 0.9 | 12.9 | 5.0 |
| May | 22° / 13° | 148 | 14.4 | 0 | 13.9 | 5.8 |
| Jun | 24° / 18° | 199 | 18.1 | 0 | 14.4 | 5.2 |
| Jul | 28° / 22° | 222 | 20.8 | 0 | 14.2 | 4.4 |
| Aug | 29° / 23° | 180 | 19.7 | 0 | 13.4 | 4.2 |
| Sep | 25° / 19° | 223 | 17.3 | 0 | 12.2 | 5.4 |
| Oct | 20° / 13° | 217 | 14.5 | 0 | 11.1 | 5.6 |
| Nov | 15° / 7° | 81 | 9.2 | 0.2 | 10.1 | 4.6 |
| Dec | 10° / 2° | 54 | 7.2 | 1.3 | 9.6 | 2.5 |
Cloud cover in August
The sky is clear or mostly clear about 18% of the time in August.
Beyond those clear spells, partly cloudy skies cover about 18% of August, with mostly cloudy or overcast conditions the remaining 64%.
| 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 (%) | 36 | 36 | 36 | 36 | 37 | 37 | 37 | 36 | 36 | 37 | 37 | 36 | 35 | 35 | 35 | 35 | 35 | 36 | 35 | 36 | 36 | 35 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 37 | 36 |
| Cloudier (%) | 64 | 64 | 64 | 64 | 63 | 63 | 63 | 64 | 64 | 63 | 63 | 64 | 65 | 65 | 65 | 65 | 65 | 64 | 65 | 64 | 64 | 65 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 63 | 64 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 36 | 64 |
| 2 | 36 | 64 |
| 3 | 36 | 64 |
| 4 | 36 | 64 |
| 5 | 37 | 63 |
| 6 | 37 | 63 |
| 7 | 37 | 63 |
| 8 | 36 | 64 |
| 9 | 36 | 64 |
| 10 | 37 | 63 |
| 11 | 37 | 63 |
| 12 | 36 | 64 |
| 13 | 35 | 65 |
| 14 | 35 | 65 |
| 15 | 35 | 65 |
| 16 | 35 | 65 |
| 17 | 35 | 65 |
| 18 | 36 | 64 |
| 19 | 35 | 65 |
| 20 | 36 | 64 |
| 21 | 36 | 64 |
| 22 | 35 | 65 |
| 23 | 36 | 64 |
| 24 | 36 | 64 |
| 25 | 36 | 64 |
| 26 | 36 | 64 |
| 27 | 36 | 64 |
| 28 | 36 | 64 |
| 29 | 36 | 64 |
| 30 | 37 | 63 |
| 31 | 36 | 64 |
Chance of precipitation in August
Yorii gets around 180 mm of rain over 19.7 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 63% and peaks near 64% 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 (%) | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 63 | 63 | 63 | 63 | 63 | 64 | 64 | 64 | 63 | 63 | 63 | 63 | 63 | 63 | 63 | 63 | 63 | 63 | 63 |
| Rain chance (%) | |
|---|---|
| 1 | 64 |
| 2 | 64 |
| 3 | 64 |
| 4 | 64 |
| 5 | 64 |
| 6 | 64 |
| 7 | 64 |
| 8 | 64 |
| 9 | 64 |
| 10 | 64 |
| 11 | 64 |
| 12 | 64 |
| 13 | 63 |
| 14 | 63 |
| 15 | 63 |
| 16 | 63 |
| 17 | 63 |
| 18 | 64 |
| 19 | 64 |
| 20 | 64 |
| 21 | 63 |
| 22 | 63 |
| 23 | 63 |
| 24 | 63 |
| 25 | 63 |
| 26 | 63 |
| 27 | 63 |
| 28 | 63 |
| 29 | 63 |
| 30 | 63 |
| 31 | 63 |
Humidity in August
Most of August feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, August lands in the oppressive band about 59% of days. Sticky, muggy-or-worse air turns up on roughly 91% 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 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 |
| Humid (%) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 8 | 8 | 9 | 9 | 10 | 10 | 11 | 12 | 12 | 13 | 14 | 15 |
| Muggy (%) | 19 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 20 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 31 | 32 | 34 | 35 | 36 | 37 | 38 | 39 | 40 |
| Oppressive (%) | 68 | 68 | 68 | 68 | 67 | 67 | 67 | 67 | 67 | 66 | 66 | 65 | 65 | 63 | 63 | 62 | 61 | 60 | 60 | 57 | 57 | 55 | 54 | 53 | 52 | 50 | 48 | 46 | 45 | 43 | 41 |
| Miserable (%) | 7 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 7 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 0 | 0 | 6 | 19 | 68 | 7 |
| 2 | 0 | 0 | 6 | 18 | 68 | 8 |
| 3 | 0 | 0 | 6 | 18 | 68 | 8 |
| 4 | 0 | 0 | 6 | 18 | 68 | 8 |
| 5 | 0 | 0 | 6 | 18 | 67 | 9 |
| 6 | 0 | 0 | 6 | 18 | 67 | 9 |
| 7 | 0 | 0 | 6 | 18 | 67 | 9 |
| 8 | 0 | 0 | 6 | 18 | 67 | 9 |
| 9 | 0 | 0 | 6 | 18 | 67 | 9 |
| 10 | 0 | 0 | 6 | 19 | 66 | 9 |
| 11 | 0 | 0 | 6 | 19 | 66 | 8 |
| 12 | 0 | 1 | 6 | 20 | 65 | 8 |
| 13 | 0 | 1 | 6 | 20 | 65 | 8 |
| 14 | 1 | 1 | 6 | 21 | 63 | 8 |
| 15 | 1 | 1 | 6 | 22 | 63 | 7 |
| 16 | 1 | 1 | 6 | 23 | 62 | 7 |
| 17 | 1 | 1 | 7 | 24 | 61 | 6 |
| 18 | 1 | 1 | 7 | 25 | 60 | 6 |
| 19 | 1 | 1 | 7 | 26 | 60 | 5 |
| 20 | 1 | 2 | 8 | 27 | 57 | 5 |
| 21 | 1 | 2 | 8 | 28 | 57 | 4 |
| 22 | 1 | 2 | 9 | 29 | 55 | 4 |
| 23 | 1 | 2 | 9 | 31 | 54 | 3 |
| 24 | 0 | 2 | 10 | 32 | 53 | 3 |
| 25 | 0 | 2 | 10 | 34 | 52 | 2 |
| 26 | 0 | 2 | 11 | 35 | 50 | 2 |
| 27 | 0 | 2 | 12 | 36 | 48 | 2 |
| 28 | 0 | 2 | 12 | 37 | 46 | 2 |
| 29 | 0 | 2 | 13 | 38 | 45 | 2 |
| 30 | 0 | 2 | 14 | 39 | 43 | 1 |
| 31 | 0 | 3 | 15 | 40 | 41 | 1 |
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 5 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 | 5 | 5 | 5 | 5 | 5 | 5 |
| 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 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 5 | calm |
| 30 | 5 | calm |
| 31 | 5 | calm |
Sunrise & sunset in August
Daylight runs from about 13 h 54 min at the start of August to 12 h 48 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 4:54 AM to 5:18 AM, and sunset from 6:45 PM to 6:09 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) | 13.9 | 13.8 | 13.8 | 13.8 | 13.7 | 13.7 | 13.7 | 13.6 | 13.6 | 13.6 | 13.5 | 13.5 | 13.5 | 13.5 | 13.4 | 13.4 | 13.3 | 13.3 | 13.3 | 13.2 | 13.2 | 13.2 | 13.1 | 13.1 | 13.1 | 13.0 | 13.0 | 13.0 | 12.9 | 12.9 | 12.8 |
| Sunrise (AM) | 4:54 | 4:54 | 4:55 | 4:56 | 4:57 | 4:58 | 4:58 | 4:59 | 5:00 | 5:01 | 5:02 | 5:03 | 5:03 | 5:04 | 5:05 | 5:06 | 5:07 | 5:07 | 5:08 | 5:09 | 5:10 | 5:11 | 5:12 | 5:12 | 5:13 | 5:14 | 5:15 | 5:16 | 5:16 | 5:17 | 5:18 |
| Sunset (PM) | 6:45 | 6:44 | 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 | 6:28 | 6:26 | 6:25 | 6:24 | 6:22 | 6:21 | 6:20 | 6:18 | 6:17 | 6:16 | 6:14 | 6:13 | 6:11 | 6:10 | 6:09 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.9 | 4:54 | 6:45 |
| 2 | 13.8 | 4:54 | 6:44 |
| 3 | 13.8 | 4:55 | 6:43 |
| 4 | 13.8 | 4:56 | 6:42 |
| 5 | 13.7 | 4:57 | 6:41 |
| 6 | 13.7 | 4:58 | 6:40 |
| 7 | 13.7 | 4:58 | 6:39 |
| 8 | 13.6 | 4:59 | 6:38 |
| 9 | 13.6 | 5:00 | 6:37 |
| 10 | 13.6 | 5:01 | 6:36 |
| 11 | 13.5 | 5:02 | 6:35 |
| 12 | 13.5 | 5:03 | 6:34 |
| 13 | 13.5 | 5:03 | 6:32 |
| 14 | 13.5 | 5:04 | 6:31 |
| 15 | 13.4 | 5:05 | 6:30 |
| 16 | 13.4 | 5:06 | 6:29 |
| 17 | 13.3 | 5:07 | 6:28 |
| 18 | 13.3 | 5:07 | 6:26 |
| 19 | 13.3 | 5:08 | 6:25 |
| 20 | 13.2 | 5:09 | 6:24 |
| 21 | 13.2 | 5:10 | 6:22 |
| 22 | 13.2 | 5:11 | 6:21 |
| 23 | 13.1 | 5:12 | 6:20 |
| 24 | 13.1 | 5:12 | 6:18 |
| 25 | 13.1 | 5:13 | 6:17 |
| 26 | 13.0 | 5:14 | 6:16 |
| 27 | 13.0 | 5:15 | 6:14 |
| 28 | 13.0 | 5:16 | 6:13 |
| 29 | 12.9 | 5:16 | 6:11 |
| 30 | 12.9 | 5:17 | 6:10 |
| 31 | 12.8 | 5:18 | 6:09 |
Solar energy in August
Average shortwave solar energy reaching the ground each day in August, about 4.47 kWh/m².
For context, solar energy here swings from a low near 2.44 kWh/m² to a high of 5.08 kWh/m² in May across the year — August's 4.47 kWh/m² sits near the top of that range.
| 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) | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.7 | 4.7 | 4.7 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.0 | 4.0 | 4.0 |
| 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 | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.8 | Bright |
| 2 | 4.8 | Bright |
| 3 | 4.8 | Bright |
| 4 | 4.8 | Bright |
| 5 | 4.8 | Bright |
| 6 | 4.8 | Bright |
| 7 | 4.7 | Bright |
| 8 | 4.7 | Bright |
| 9 | 4.7 | Bright |
| 10 | 4.6 | Bright |
| 11 | 4.6 | Bright |
| 12 | 4.6 | Bright |
| 13 | 4.5 | Bright |
| 14 | 4.5 | Bright |
| 15 | 4.5 | Bright |
| 16 | 4.4 | Bright |
| 17 | 4.4 | Bright |
| 18 | 4.4 | Bright |
| 19 | 4.3 | Bright |
| 20 | 4.3 | Bright |
| 21 | 4.3 | Bright |
| 22 | 4.3 | Bright |
| 23 | 4.2 | Bright |
| 24 | 4.2 | Bright |
| 25 | 4.2 | Bright |
| 26 | 4.1 | Bright |
| 27 | 4.1 | Bright |
| 28 | 4.1 | Bright |
| 29 | 4.0 | Bright |
| 30 | 4.0 | Bright |
| 31 | 4.0 | Moderate |
Hazard calendar for Yorii
In August, Yorii sits inside its rainy season season. The full year is below, with each hazard's peak months called out.
Yorii's rainy season runs March–October, when most of the year's rain falls.
Is August a good time to visit Yorii?
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 Yorii for sightseeing.
What to pack for Yorii in August
From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In August, Yorii sees daytime highs around 29°C and nights near 23°C. Pack light clothes and rain gear. About 20 days see rain.
UV index in Yorii 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 Yorii peaks around July 15 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 4 | 7 | 8 | 9 | 10 | 9 | 8 | 6 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 4 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 10 | Very high |
| Aug | 9 | Very high |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Moderate |
Air quality in Yorii 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 Yorii is worst in April — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 14 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) | 15 | 21 | 25 | 26 | 24 | 20 | 17 | 16 | 16 | 16 | 16 | 14 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 15 | Moderate |
| Feb | 21 | Moderate |
| Mar | 25 | Moderate |
| Apr | 26 | Moderate |
| May | 24 | Moderate |
| Jun | 20 | Moderate |
| Jul | 17 | Moderate |
| Aug | 16 | Moderate |
| Sep | 16 | Moderate |
| Oct | 16 | Moderate |
| Nov | 16 | Moderate |
| Dec | 14 | Moderate |
Where is Yorii?
Yorii sits at 36.1°N, 139.2°E, 102 m above sea level, in Japan. The nearest listed city is Ogawamachi, 9.0 km away.
Topography around Yorii
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Yorii.
Within 3 km, the terrain around Yorii has significant variations in elevation — a maximum elevation change of 298 m around an average of 139 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 955 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,855 m.
The land around Yorii is covered by trees (55%) and artificial surfaces (27%) within 3 km, trees (54%) and artificial surfaces (23%) within 16 km, and trees (60%) and artificial surfaces (23%) 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 Yorii (36.1157°, 139.1943°, elevation 102 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. 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).