Iyo weather in April
In April, Iyo sees average daytime highs of 18°C and overnight lows near 10°C, with 133 mm of precipitation across 11 wet days and about 12.8 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.
Highs climb over the month, from about 15°C in the first days to 20°C by the end. The sky is clear or mostly clear about 35% of the time in April, and the air most often feels dry.
Daylight stretches from about 12 h 18 min at the start of April to 13 h 18 min by month's end. Set against the rest of the year, April is Iyo's 4th-clearest and 7th-windiest month. For the whole year in context, see Iyo's year-round climate.
- Daytime high
- 18°
- 7th warmest
- Overnight low
- 10°
- 6th coldest
- Precipitation
- 133 mm
- 11 wet days
- Daylight
- 12 h 48 min
- 5:44 AM – 6:35 PM
- Cloud cover
- 58%
- 4th clearest
- Wind
- 9 km/h
- 7th windiest
- Solar energy
- 5.3 kWh/m²
- Travel score
- 5.5
- 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 April
Highs climb over the month, from about 15°C in the first days to 20°C by the end.
A typical April day in Iyo 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, April runs about 5°C warmer than March and about 4°C cooler than May.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 15 | 15 | 16 | 16 | 16 | 16 | 16 | 16 | 17 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 20 |
| Avg low (°C) | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 11 | 11 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 12 | 12 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 15 | 7 |
| 2 | 15 | 8 |
| 3 | 16 | 8 |
| 4 | 16 | 8 |
| 5 | 16 | 8 |
| 6 | 16 | 8 |
| 7 | 16 | 8 |
| 8 | 16 | 9 |
| 9 | 17 | 9 |
| 10 | 17 | 9 |
| 11 | 17 | 9 |
| 12 | 17 | 9 |
| 13 | 17 | 10 |
| 14 | 17 | 10 |
| 15 | 18 | 10 |
| 16 | 18 | 10 |
| 17 | 18 | 10 |
| 18 | 18 | 10 |
| 19 | 18 | 10 |
| 20 | 18 | 11 |
| 21 | 19 | 11 |
| 22 | 19 | 11 |
| 23 | 19 | 11 |
| 24 | 19 | 11 |
| 25 | 19 | 11 |
| 26 | 19 | 12 |
| 27 | 20 | 12 |
| 28 | 20 | 12 |
| 29 | 20 | 12 |
| 30 | 20 | 12 |
How April really feels in Iyo
Once humidity and wind are folded in, April 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.
April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Iyo weather by month
How April compares with the rest of the year at a glance. April is the 7th-warmest and 7th-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 April
The sky is clear or mostly clear about 35% of the time in April.
Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 51%.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 51 | 51 | 51 | 50 | 50 | 50 | 50 | 50 | 49 | 48 | 48 | 47 | 47 | 48 | 47 | 47 | 47 | 47 | 48 | 48 | 47 | 47 | 48 | 49 | 49 | 49 | 49 | 50 | 48 | 48 |
| Cloudier (%) | 49 | 49 | 49 | 50 | 50 | 50 | 50 | 50 | 51 | 52 | 52 | 53 | 53 | 52 | 53 | 53 | 53 | 53 | 52 | 52 | 53 | 53 | 52 | 51 | 51 | 51 | 51 | 50 | 52 | 52 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 51 | 49 |
| 2 | 51 | 49 |
| 3 | 51 | 49 |
| 4 | 50 | 50 |
| 5 | 50 | 50 |
| 6 | 50 | 50 |
| 7 | 50 | 50 |
| 8 | 50 | 50 |
| 9 | 49 | 51 |
| 10 | 48 | 52 |
| 11 | 48 | 52 |
| 12 | 47 | 53 |
| 13 | 47 | 53 |
| 14 | 48 | 52 |
| 15 | 47 | 53 |
| 16 | 47 | 53 |
| 17 | 47 | 53 |
| 18 | 47 | 53 |
| 19 | 48 | 52 |
| 20 | 48 | 52 |
| 21 | 47 | 53 |
| 22 | 47 | 53 |
| 23 | 48 | 52 |
| 24 | 49 | 51 |
| 25 | 49 | 51 |
| 26 | 49 | 51 |
| 27 | 49 | 51 |
| 28 | 50 | 50 |
| 29 | 48 | 52 |
| 30 | 48 | 52 |
Chance of precipitation in April
Iyo gets around 133 mm of rain and snow over 11 wet days in April. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 37% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 37 | 37 | 37 | 38 | 38 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 38 | 38 | 37 | 37 | 36 | 36 | 35 | 35 | 35 | 35 |
| Rain chance (%) | |
|---|---|
| 1 | 36 |
| 2 | 36 |
| 3 | 36 |
| 4 | 36 |
| 5 | 36 |
| 6 | 36 |
| 7 | 36 |
| 8 | 36 |
| 9 | 37 |
| 10 | 37 |
| 11 | 37 |
| 12 | 38 |
| 13 | 38 |
| 14 | 39 |
| 15 | 39 |
| 16 | 39 |
| 17 | 39 |
| 18 | 39 |
| 19 | 39 |
| 20 | 39 |
| 21 | 38 |
| 22 | 38 |
| 23 | 37 |
| 24 | 37 |
| 25 | 36 |
| 26 | 36 |
| 27 | 35 |
| 28 | 35 |
| 29 | 35 |
| 30 | 35 |
Humidity in April
Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April lands in the dry band about 86% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 95 | 94 | 94 | 93 | 92 | 91 | 91 | 90 | 90 | 90 | 89 | 89 | 89 | 88 | 88 | 87 | 86 | 86 | 86 | 84 | 83 | 83 | 82 | 80 | 79 | 78 | 76 | 74 | 73 | 72 |
| Comfortable (%) | 4 | 5 | 5 | 6 | 6 | 7 | 7 | 8 | 8 | 8 | 9 | 9 | 9 | 10 | 10 | 10 | 11 | 11 | 11 | 12 | 13 | 13 | 14 | 15 | 16 | 16 | 17 | 18 | 18 | 19 |
| Humid (%) | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 5 | 5 | 6 | 6 | 7 | 8 | 8 |
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 95 | 4 | 1 | 0 |
| 2 | 94 | 5 | 1 | 0 |
| 3 | 94 | 5 | 1 | 0 |
| 4 | 93 | 6 | 1 | 0 |
| 5 | 92 | 6 | 2 | 0 |
| 6 | 91 | 7 | 2 | 0 |
| 7 | 91 | 7 | 2 | 0 |
| 8 | 90 | 8 | 2 | 0 |
| 9 | 90 | 8 | 2 | 0 |
| 10 | 90 | 8 | 2 | 0 |
| 11 | 89 | 9 | 2 | 0 |
| 12 | 89 | 9 | 2 | 0 |
| 13 | 89 | 9 | 2 | 0 |
| 14 | 88 | 10 | 2 | 0 |
| 15 | 88 | 10 | 2 | 0 |
| 16 | 87 | 10 | 3 | 0 |
| 17 | 86 | 11 | 3 | 0 |
| 18 | 86 | 11 | 3 | 0 |
| 19 | 86 | 11 | 3 | 0 |
| 20 | 84 | 12 | 4 | 0 |
| 21 | 83 | 13 | 4 | 0 |
| 22 | 83 | 13 | 4 | 0 |
| 23 | 82 | 14 | 4 | 0 |
| 24 | 80 | 15 | 5 | 0 |
| 25 | 79 | 16 | 5 | 0 |
| 26 | 78 | 16 | 6 | 0 |
| 27 | 76 | 17 | 6 | 1 |
| 28 | 74 | 18 | 7 | 1 |
| 29 | 73 | 18 | 8 | 1 |
| 30 | 72 | 19 | 8 | 1 |
Wind in April
Winds average 9 km/h in April.
Across April, daily wind ranges from about 8 km/h on the calmest days to 9 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 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 |
| 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 | 8 | 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 |
Sunrise & sunset in April
Daylight runs from about 12 h 18 min at the start of April to 13 h 18 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 60 minutes over April. Sunrise moves from 6:04 AM to 5:28 AM, and sunset from 6:23 PM to 6:45 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.3 | 12.3 | 12.4 | 12.4 | 12.5 | 12.5 | 12.5 | 12.6 | 12.6 | 12.6 | 12.7 | 12.7 | 12.7 | 12.8 | 12.8 | 12.8 | 12.9 | 12.9 | 12.9 | 13.0 | 13.0 | 13.0 | 13.1 | 13.1 | 13.1 | 13.2 | 13.2 | 13.2 | 13.3 | 13.3 |
| Sunrise (AM) | 6:04 | 6:03 | 6:02 | 6:00 | 5:59 | 5:58 | 5:56 | 5:55 | 5:53 | 5:52 | 5:51 | 5:49 | 5:48 | 5:47 | 5:46 | 5:44 | 5:43 | 5:42 | 5:40 | 5:39 | 5:38 | 5:37 | 5:36 | 5:34 | 5:33 | 5:32 | 5:31 | 5:30 | 5:29 | 5:28 |
| Sunset (PM) | 6:23 | 6:24 | 6:25 | 6:26 | 6:26 | 6:27 | 6:28 | 6:29 | 6:29 | 6:30 | 6:31 | 6:32 | 6:32 | 6:33 | 6:34 | 6:35 | 6:35 | 6:36 | 6:37 | 6:38 | 6:38 | 6:39 | 6:40 | 6:41 | 6:42 | 6:42 | 6:43 | 6:44 | 6:45 | 6:45 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.3 | 6:04 | 6:23 |
| 2 | 12.3 | 6:03 | 6:24 |
| 3 | 12.4 | 6:02 | 6:25 |
| 4 | 12.4 | 6:00 | 6:26 |
| 5 | 12.5 | 5:59 | 6:26 |
| 6 | 12.5 | 5:58 | 6:27 |
| 7 | 12.5 | 5:56 | 6:28 |
| 8 | 12.6 | 5:55 | 6:29 |
| 9 | 12.6 | 5:53 | 6:29 |
| 10 | 12.6 | 5:52 | 6:30 |
| 11 | 12.7 | 5:51 | 6:31 |
| 12 | 12.7 | 5:49 | 6:32 |
| 13 | 12.7 | 5:48 | 6:32 |
| 14 | 12.8 | 5:47 | 6:33 |
| 15 | 12.8 | 5:46 | 6:34 |
| 16 | 12.8 | 5:44 | 6:35 |
| 17 | 12.9 | 5:43 | 6:35 |
| 18 | 12.9 | 5:42 | 6:36 |
| 19 | 12.9 | 5:40 | 6:37 |
| 20 | 13.0 | 5:39 | 6:38 |
| 21 | 13.0 | 5:38 | 6:38 |
| 22 | 13.0 | 5:37 | 6:39 |
| 23 | 13.1 | 5:36 | 6:40 |
| 24 | 13.1 | 5:34 | 6:41 |
| 25 | 13.1 | 5:33 | 6:42 |
| 26 | 13.2 | 5:32 | 6:42 |
| 27 | 13.2 | 5:31 | 6:43 |
| 28 | 13.2 | 5:30 | 6:44 |
| 29 | 13.3 | 5:29 | 6:45 |
| 30 | 13.3 | 5:28 | 6:45 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 5.3 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 — April's 5.3 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.9 | 5.0 | 5.0 | 5.0 | 5.0 | 5.1 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 |
| 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 |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.9 | Bright |
| 2 | 5.0 | Bright |
| 3 | 5.0 | Bright |
| 4 | 5.0 | Bright |
| 5 | 5.0 | Bright |
| 6 | 5.1 | Bright |
| 7 | 5.1 | Bright |
| 8 | 5.1 | Bright |
| 9 | 5.1 | Bright |
| 10 | 5.2 | Bright |
| 11 | 5.2 | Bright |
| 12 | 5.2 | Bright |
| 13 | 5.2 | Bright |
| 14 | 5.2 | Bright |
| 15 | 5.3 | Bright |
| 16 | 5.3 | Bright |
| 17 | 5.3 | Bright |
| 18 | 5.3 | Bright |
| 19 | 5.3 | Bright |
| 20 | 5.4 | Bright |
| 21 | 5.4 | Bright |
| 22 | 5.4 | Bright |
| 23 | 5.4 | Bright |
| 24 | 5.4 | Bright |
| 25 | 5.5 | Bright |
| 26 | 5.5 | Bright |
| 27 | 5.5 | Bright |
| 28 | 5.5 | Bright |
| 29 | 5.5 | Bright |
| 30 | 5.5 | Bright |
Hazard calendar for Iyo
In April, 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 April a good time to visit Iyo?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is a reasonable time to visit Iyo for sightseeing.
What to pack for Iyo in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Iyo sees daytime highs around 18°C and nights near 10°C. Worth packing: rain gear and sun protection. About 11 days see rain.
Sea temperature near Iyo in April
The nearest coast averages about 15°C in April — 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 April
Clear-sky midday UV in April peaks around 7 — enough to warrant sun protection. 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 April
Average fine-particle pollution (PM2.5) through the year — so you can see where April 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).