Iyo weather in August
In August, Iyo sees average daytime highs of 30°C and overnight lows near 24°C, with 156 mm of rain across 15.8 wet days and about 13.3 hours of daylight. It is the 1st-warmest and 4th-wettest month of the year here.
Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 28% of the time in August, and the air most often feels oppressive.
Daylight stretches from about 13 h 42 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Iyo's 9th-clearest and 11th-windiest month. For the whole year in context, see Iyo's year-round climate.
- Daytime high
- 30°
- 1st warmest
- Overnight low
- 24°
- 12th coldest
- Rainfall
- 156 mm
- 15.8 wet days
- Daylight
- 13 h 18 min
- 5:35 AM – 6:51 PM
- Cloud cover
- 61%
- 9th clearest
- Wind
- 7 km/h
- 11th windiest
- Solar energy
- 5.24 kWh/m²
- Travel score
- 4.5
- out of 10
Iyo is city in Ehime Prefecture, Japan.
- Density
- 181/km²
- people per km²
- Founded
- 2005
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in August
Day-to-day highs hold fairly steady near 30°C through the month.
A typical August day in Iyo reaches about 30°C in the afternoon and slips back to 24°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 32°C. Set against its neighbours, August runs about 1°C warmer than July and about 3°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 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
| Avg low (°C) | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 30 | 24 |
| 2 | 30 | 24 |
| 3 | 30 | 24 |
| 4 | 30 | 24 |
| 5 | 30 | 24 |
| 6 | 30 | 24 |
| 7 | 30 | 24 |
| 8 | 30 | 24 |
| 9 | 30 | 24 |
| 10 | 30 | 24 |
| 11 | 30 | 24 |
| 12 | 30 | 24 |
| 13 | 30 | 24 |
| 14 | 30 | 24 |
| 15 | 30 | 24 |
| 16 | 30 | 24 |
| 17 | 30 | 24 |
| 18 | 30 | 24 |
| 19 | 30 | 24 |
| 20 | 30 | 24 |
| 21 | 30 | 24 |
| 22 | 30 | 24 |
| 23 | 29 | 24 |
| 24 | 29 | 23 |
| 25 | 29 | 23 |
| 26 | 29 | 23 |
| 27 | 29 | 23 |
| 28 | 29 | 23 |
| 29 | 29 | 23 |
| 30 | 29 | 23 |
| 31 | 29 | 23 |
How August really feels in Iyo
Once humidity and wind are folded in, August averages 26 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.
Iyo weather by month
How August compares with the rest of the year at a glance. August is the 1st-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 | 8° / 2° | 69 | 11.3 | 3.3 | 10 | 1.4 |
| Feb | 9° / 3° | 79 | 10.4 | 2.9 | 10.7 | 1.8 |
| Mar | 13° / 5° | 118 | 12.3 | 0.7 | 11.7 | 3.4 |
| Apr | 18° / 10° | 133 | 11 | 0.1 | 12.8 | 5.5 |
| May | 22° / 15° | 154 | 11.1 | 0 | 13.7 | 6.4 |
| Jun | 25° / 19° | 268 | 15.7 | 0 | 14.2 | 5.6 |
| Jul | 29° / 23° | 239 | 16.8 | 0 | 14 | 4.7 |
| Aug | 30° / 24° | 156 | 15.8 | 0 | 13.3 | 4.5 |
| Sep | 27° / 20° | 187 | 13.6 | 0 | 12.2 | 5.9 |
| Oct | 22° / 15° | 141 | 9.4 | 0 | 11.2 | 6.9 |
| Nov | 16° / 9° | 83 | 9.1 | 0 | 10.2 | 5.3 |
| Dec | 11° / 4° | 83 | 11.4 | 1.9 | 9.8 | 2.6 |
Cloud cover in August
The sky is clear or mostly clear about 28% 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 54%.
| 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 (%) | 46 | 46 | 47 | 46 | 47 | 47 | 47 | 47 | 47 | 47 | 46 | 46 | 46 | 45 | 45 | 45 | 46 | 46 | 48 | 48 | 48 | 48 | 48 | 47 | 47 | 47 | 47 | 45 | 45 | 47 | 46 |
| Cloudier (%) | 54 | 54 | 53 | 54 | 53 | 53 | 53 | 53 | 53 | 53 | 54 | 54 | 54 | 55 | 55 | 55 | 54 | 54 | 52 | 52 | 52 | 52 | 52 | 53 | 53 | 53 | 53 | 55 | 55 | 53 | 54 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 46 | 54 |
| 2 | 46 | 54 |
| 3 | 47 | 53 |
| 4 | 46 | 54 |
| 5 | 47 | 53 |
| 6 | 47 | 53 |
| 7 | 47 | 53 |
| 8 | 47 | 53 |
| 9 | 47 | 53 |
| 10 | 47 | 53 |
| 11 | 46 | 54 |
| 12 | 46 | 54 |
| 13 | 46 | 54 |
| 14 | 45 | 55 |
| 15 | 45 | 55 |
| 16 | 45 | 55 |
| 17 | 46 | 54 |
| 18 | 46 | 54 |
| 19 | 48 | 52 |
| 20 | 48 | 52 |
| 21 | 48 | 52 |
| 22 | 48 | 52 |
| 23 | 48 | 52 |
| 24 | 47 | 53 |
| 25 | 47 | 53 |
| 26 | 47 | 53 |
| 27 | 47 | 53 |
| 28 | 45 | 55 |
| 29 | 45 | 55 |
| 30 | 47 | 53 |
| 31 | 46 | 54 |
Chance of precipitation in August
Iyo gets around 156 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 (%) | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 51 | 51 | 51 | 51 | 51 | 51 | 50 | 50 | 50 | 50 | 49 | 49 | 49 | 49 | 49 | 50 | 50 | 50 | 51 | 51 | 51 | 51 | 52 | 52 |
| Rain chance (%) | |
|---|---|
| 1 | 52 |
| 2 | 52 |
| 3 | 52 |
| 4 | 52 |
| 5 | 52 |
| 6 | 52 |
| 7 | 52 |
| 8 | 51 |
| 9 | 51 |
| 10 | 51 |
| 11 | 51 |
| 12 | 51 |
| 13 | 51 |
| 14 | 50 |
| 15 | 50 |
| 16 | 50 |
| 17 | 50 |
| 18 | 49 |
| 19 | 49 |
| 20 | 49 |
| 21 | 49 |
| 22 | 49 |
| 23 | 50 |
| 24 | 50 |
| 25 | 50 |
| 26 | 51 |
| 27 | 51 |
| 28 | 51 |
| 29 | 51 |
| 30 | 52 |
| 31 | 52 |
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 80% of days. Sticky, muggy-or-worse air turns up on roughly 97% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable (%) | 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 | 1 | 1 | 1 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 5 | 5 | 6 | 7 | 7 | 8 |
| Muggy (%) | 7 | 6 | 6 | 6 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 10 | 11 | 12 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 26 |
| Oppressive (%) | 87 | 88 | 87 | 87 | 88 | 88 | 88 | 87 | 87 | 87 | 87 | 85 | 85 | 84 | 83 | 82 | 82 | 81 | 79 | 78 | 77 | 76 | 75 | 75 | 73 | 72 | 71 | 69 | 67 | 67 | 64 |
| Miserable (%) | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 1 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|
| 1 | 0 | 0 | 7 | 87 | 6 |
| 2 | 0 | 0 | 6 | 88 | 6 |
| 3 | 0 | 0 | 6 | 87 | 7 |
| 4 | 0 | 0 | 6 | 87 | 7 |
| 5 | 0 | 0 | 5 | 88 | 7 |
| 6 | 0 | 0 | 5 | 88 | 7 |
| 7 | 0 | 0 | 5 | 88 | 7 |
| 8 | 0 | 0 | 6 | 87 | 7 |
| 9 | 0 | 0 | 6 | 87 | 7 |
| 10 | 0 | 0 | 6 | 87 | 7 |
| 11 | 0 | 0 | 6 | 87 | 7 |
| 12 | 0 | 1 | 7 | 85 | 7 |
| 13 | 0 | 1 | 7 | 85 | 7 |
| 14 | 0 | 1 | 8 | 84 | 7 |
| 15 | 1 | 1 | 8 | 83 | 7 |
| 16 | 1 | 1 | 9 | 82 | 7 |
| 17 | 1 | 1 | 10 | 82 | 6 |
| 18 | 1 | 1 | 11 | 81 | 6 |
| 19 | 1 | 2 | 12 | 79 | 6 |
| 20 | 1 | 2 | 14 | 78 | 5 |
| 21 | 1 | 2 | 15 | 77 | 5 |
| 22 | 1 | 3 | 16 | 76 | 4 |
| 23 | 1 | 3 | 17 | 75 | 4 |
| 24 | 1 | 3 | 18 | 75 | 3 |
| 25 | 1 | 4 | 19 | 73 | 3 |
| 26 | 1 | 5 | 20 | 72 | 2 |
| 27 | 1 | 5 | 21 | 71 | 2 |
| 28 | 1 | 6 | 22 | 69 | 2 |
| 29 | 1 | 7 | 23 | 67 | 2 |
| 30 | 1 | 7 | 24 | 67 | 1 |
| 31 | 1 | 8 | 26 | 64 | 1 |
Wind in August
Winds average 7 km/h in August.
Across August, daily wind ranges from about 7 km/h on the calmest days to 7 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 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| 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 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 7 | calm |
| 30 | 7 | calm |
| 31 | 7 | calm |
Sunrise & sunset in August
Daylight runs from about 13 h 42 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 54 minutes over August. Sunrise moves from 5:24 AM to 5:46 AM, and sunset from 7:06 PM to 6:32 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) | 13.7 | 13.7 | 13.6 | 13.6 | 13.6 | 13.6 | 13.5 | 13.5 | 13.5 | 13.4 | 13.4 | 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 | 12.9 | 12.8 | 12.8 | 12.8 |
| Sunrise (AM) | 5:24 | 5:25 | 5:26 | 5:27 | 5:27 | 5:28 | 5:29 | 5:29 | 5:30 | 5:31 | 5:32 | 5:32 | 5:33 | 5:34 | 5:35 | 5:35 | 5:36 | 5:37 | 5:38 | 5:38 | 5:39 | 5:40 | 5:40 | 5:41 | 5:42 | 5:43 | 5:43 | 5:44 | 5:45 | 5:45 | 5:46 |
| Sunset (PM) | 7:06 | 7:05 | 7:04 | 7:04 | 7:03 | 7:02 | 7:01 | 7:00 | 6:59 | 6:58 | 6:57 | 6:56 | 6:55 | 6:53 | 6:52 | 6:51 | 6:50 | 6:49 | 6:48 | 6:47 | 6:45 | 6:44 | 6:43 | 6:42 | 6:40 | 6:39 | 6:38 | 6:36 | 6:35 | 6:34 | 6:32 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.7 | 5:24 | 7:06 |
| 2 | 13.7 | 5:25 | 7:05 |
| 3 | 13.6 | 5:26 | 7:04 |
| 4 | 13.6 | 5:27 | 7:04 |
| 5 | 13.6 | 5:27 | 7:03 |
| 6 | 13.6 | 5:28 | 7:02 |
| 7 | 13.5 | 5:29 | 7:01 |
| 8 | 13.5 | 5:29 | 7:00 |
| 9 | 13.5 | 5:30 | 6:59 |
| 10 | 13.4 | 5:31 | 6:58 |
| 11 | 13.4 | 5:32 | 6:57 |
| 12 | 13.4 | 5:32 | 6:56 |
| 13 | 13.4 | 5:33 | 6:55 |
| 14 | 13.3 | 5:34 | 6:53 |
| 15 | 13.3 | 5:35 | 6:52 |
| 16 | 13.3 | 5:35 | 6:51 |
| 17 | 13.2 | 5:36 | 6:50 |
| 18 | 13.2 | 5:37 | 6:49 |
| 19 | 13.2 | 5:38 | 6:48 |
| 20 | 13.1 | 5:38 | 6:47 |
| 21 | 13.1 | 5:39 | 6:45 |
| 22 | 13.1 | 5:40 | 6:44 |
| 23 | 13.0 | 5:40 | 6:43 |
| 24 | 13.0 | 5:41 | 6:42 |
| 25 | 13.0 | 5:42 | 6:40 |
| 26 | 12.9 | 5:43 | 6:39 |
| 27 | 12.9 | 5:43 | 6:38 |
| 28 | 12.9 | 5:44 | 6:36 |
| 29 | 12.8 | 5:45 | 6:35 |
| 30 | 12.8 | 5:45 | 6:34 |
| 31 | 12.8 | 5:46 | 6:32 |
Solar energy in August
Average shortwave solar energy reaching the ground each day in August, about 5.24 kWh/m².
For context, solar energy here swings from a low near 2.43 kWh/m² to a high of 5.57 kWh/m² in May across the year — August's 5.24 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) | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.2 | 5.2 | 5.2 | 5.2 | 5.1 | 5.1 | 5.1 | 5.1 | 5.0 | 5.0 | 5.0 | 4.9 | 4.9 | 4.9 | 4.8 | 4.8 |
| 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 | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.5 | Bright |
| 2 | 5.5 | Bright |
| 3 | 5.5 | Bright |
| 4 | 5.5 | Bright |
| 5 | 5.5 | Bright |
| 6 | 5.4 | Bright |
| 7 | 5.4 | Bright |
| 8 | 5.4 | Bright |
| 9 | 5.4 | Bright |
| 10 | 5.4 | Bright |
| 11 | 5.3 | Bright |
| 12 | 5.3 | Bright |
| 13 | 5.3 | Bright |
| 14 | 5.3 | Bright |
| 15 | 5.3 | Bright |
| 16 | 5.2 | Bright |
| 17 | 5.2 | Bright |
| 18 | 5.2 | Bright |
| 19 | 5.2 | Bright |
| 20 | 5.1 | Bright |
| 21 | 5.1 | Bright |
| 22 | 5.1 | Bright |
| 23 | 5.1 | Bright |
| 24 | 5.0 | Bright |
| 25 | 5.0 | Bright |
| 26 | 5.0 | Bright |
| 27 | 4.9 | Bright |
| 28 | 4.9 | Bright |
| 29 | 4.9 | Bright |
| 30 | 4.8 | Bright |
| 31 | 4.8 | Bright |
Hazard calendar for Iyo
In August, Iyo sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Iyo sits in the Pacific typhoon belt; the season peaks July–October.
Is August a good time to visit Iyo?
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 Iyo for sightseeing.
What to pack for Iyo in August
From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In August, Iyo sees daytime highs around 30°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 16 days see rain.
Sea temperature near Iyo in August
The nearest coast averages about 26°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 15 km away) is warmest in August at about 26°C and coldest in February near 13°C.
It's comfortable for a long swim from Jun 12 to Nov 17 — about 5.2 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 15 | 13 | 13 | 15 | 17 | 21 | 24 | 26 | 25 | 23 | 20 | 17 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Warm | Warm | Refreshing | Refreshing | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 15 | Bracing |
| Feb | 13 | Bracing |
| Mar | 13 | Bracing |
| Apr | 15 | Bracing |
| May | 17 | Cool |
| Jun | 21 | Refreshing |
| Jul | 24 | Warm |
| Aug | 26 | Warm |
| Sep | 25 | Warm |
| Oct | 23 | Refreshing |
| Nov | 20 | Refreshing |
| Dec | 17 | Cool |
UV index in Iyo 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 Iyo peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 5 | 6 | 7 | 9 | 10 | 10 | 9 | 10 | 7 | 4 | 3 |
| Level | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 5 | Moderate |
| Mar | 6 | High |
| Apr | 7 | Very high |
| May | 9 | Very high |
| Jun | 10 | Extreme |
| Jul | 10 | Extreme |
| Aug | 9 | Very high |
| Sep | 10 | Very high |
| Oct | 7 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Air quality in Iyo 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 Iyo is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 11 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) | 14 | 17 | 21 | 23 | 21 | 19 | 15 | 15 | 12 | 11 | 12 | 11 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 17 | Moderate |
| Mar | 21 | Moderate |
| Apr | 23 | Moderate |
| May | 21 | Moderate |
| Jun | 19 | Moderate |
| Jul | 15 | Moderate |
| Aug | 15 | Moderate |
| Sep | 12 | Moderate |
| Oct | 11 | Good |
| Nov | 12 | Good |
| Dec | 11 | Good |
Where is Iyo?
Iyo sits at 33.8°N, 132.7°E, 14 m above sea level, in Japan. The nearest listed city is Masaki-chō, 4.0 km away.
Topography around Iyo
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Iyo.
Within 3 km, the terrain around Iyo has significant variations in elevation — a maximum elevation change of 427 m around an average of 50 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,141 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,895 m.
The land around Iyo is covered by trees (30%), water (29%) and artificial surfaces (24%) within 3 km, trees (44%) and water (37%) within 16 km, and trees (52%) and water (42%) 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 Iyo (33.7514°, 132.7014°, elevation 14 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).