Aioi weather in October
In October, Aioi sees average daytime highs of 21°C and overnight lows near 17°C, with 144 mm of rain across 8.9 wet days and about 11.1 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.
Highs ease over the month, from about 23°C in the first days to 19°C by the end. The sky is clear or mostly clear about 45% of the time in October, and the air most often feels dry.
Daylight stretches from about 11 h 42 min at the start of October to 10 h 36 min by month's end. Set against the rest of the year, October is Aioi's 1st-clearest and 6th-windiest month. For the whole year in context, see Aioi's year-round climate.
- Daytime high
- 21°
- 5th warmest
- Overnight low
- 17°
- 8th coldest
- Rainfall
- 144 mm
- 8.9 wet days
- Daylight
- 11 h 06 min
- 6:14 AM – 5:20 PM
- Cloud cover
- 50%
- 1st clearest
- Wind
- 15 km/h
- 6th windiest
- Solar energy
- 3.66 kWh/m²
- Travel score
- 6.8
- out of 10
Aioi is city in Hyōgo Prefecture, Japan.
- Density
- 313/km²
- people per km²
- Founded
- 1942
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in October
Highs ease over the month, from about 23°C in the first days to 19°C by the end.
A typical October day in Aioi reaches about 21°C in the afternoon and slips back to 17°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 23°C. Set against its neighbours, October runs about 4°C cooler than September and about 5°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) | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 |
| Avg low (°C) | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 24 | 20 |
| 2 | 23 | 20 |
| 3 | 23 | 19 |
| 4 | 23 | 19 |
| 5 | 23 | 19 |
| 6 | 23 | 19 |
| 7 | 23 | 19 |
| 8 | 23 | 19 |
| 9 | 22 | 18 |
| 10 | 22 | 18 |
| 11 | 22 | 18 |
| 12 | 22 | 18 |
| 13 | 22 | 18 |
| 14 | 22 | 18 |
| 15 | 22 | 17 |
| 16 | 21 | 17 |
| 17 | 21 | 17 |
| 18 | 21 | 17 |
| 19 | 21 | 17 |
| 20 | 21 | 16 |
| 21 | 21 | 16 |
| 22 | 20 | 16 |
| 23 | 20 | 16 |
| 24 | 20 | 16 |
| 25 | 20 | 16 |
| 26 | 20 | 15 |
| 27 | 19 | 15 |
| 28 | 19 | 15 |
| 29 | 19 | 15 |
| 30 | 19 | 15 |
| 31 | 19 | 15 |
How October really feels in Aioi
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.
Aioi weather by month
How October compares with the rest of the year at a glance. October is the 5th-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 | 9° / 5° | 50 | 7.1 | 0.4 | 9.9 | 1.9 |
| Feb | 9° / 5° | 63 | 7.7 | 0.6 | 10.7 | 2.0 |
| Mar | 12° / 7° | 112 | 9.9 | 0 | 11.7 | 3.2 |
| Apr | 16° / 11° | 131 | 10.3 | 0 | 12.8 | 4.9 |
| May | 19° / 16° | 146 | 10.2 | 0 | 13.8 | 6.1 |
| Jun | 23° / 20° | 185 | 12.4 | 0 | 14.3 | 6.0 |
| Jul | 26° / 24° | 193 | 12.8 | 0 | 14.1 | 6.1 |
| Aug | 28° / 25° | 112 | 10.4 | 0 | 13.3 | 6.1 |
| Sep | 26° / 22° | 195 | 12.3 | 0 | 12.2 | 6.4 |
| Oct | 21° / 17° | 144 | 8.9 | 0 | 11.1 | 6.8 |
| Nov | 16° / 12° | 74 | 7 | 0 | 10.2 | 5.5 |
| Dec | 11° / 7° | 61 | 6.9 | 0 | 9.7 | 3.1 |
Cloud cover in October
The sky is clear or mostly clear about 45% of the time in October, the clearest month of the year.
Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 40%. 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 (%) | 52 | 51 | 52 | 52 | 53 | 54 | 56 | 57 | 57 | 58 | 58 | 59 | 60 | 60 | 60 | 61 | 62 | 62 | 63 | 63 | 63 | 63 | 64 | 64 | 64 | 64 | 65 | 65 | 65 | 65 | 65 |
| Cloudier (%) | 48 | 49 | 48 | 48 | 47 | 46 | 44 | 43 | 43 | 42 | 42 | 41 | 40 | 40 | 40 | 39 | 38 | 38 | 37 | 37 | 37 | 37 | 36 | 36 | 36 | 36 | 35 | 35 | 35 | 35 | 35 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 52 | 48 |
| 2 | 51 | 49 |
| 3 | 52 | 48 |
| 4 | 52 | 48 |
| 5 | 53 | 47 |
| 6 | 54 | 46 |
| 7 | 56 | 44 |
| 8 | 57 | 43 |
| 9 | 57 | 43 |
| 10 | 58 | 42 |
| 11 | 58 | 42 |
| 12 | 59 | 41 |
| 13 | 60 | 40 |
| 14 | 60 | 40 |
| 15 | 60 | 40 |
| 16 | 61 | 39 |
| 17 | 62 | 38 |
| 18 | 62 | 38 |
| 19 | 63 | 37 |
| 20 | 63 | 37 |
| 21 | 63 | 37 |
| 22 | 63 | 37 |
| 23 | 64 | 36 |
| 24 | 64 | 36 |
| 25 | 64 | 36 |
| 26 | 64 | 36 |
| 27 | 65 | 35 |
| 28 | 65 | 35 |
| 29 | 65 | 35 |
| 30 | 65 | 35 |
| 31 | 65 | 35 |
Chance of precipitation in October
Aioi gets around 144 mm of rain over 8.9 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 29% and peaks near 37% on the wettest days. The odds ease toward the end of the month.
| 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 (%) | 37 | 36 | 36 | 36 | 35 | 35 | 34 | 33 | 32 | 31 | 31 | 30 | 29 | 28 | 28 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 |
| Rain chance (%) | |
|---|---|
| 1 | 37 |
| 2 | 36 |
| 3 | 36 |
| 4 | 36 |
| 5 | 35 |
| 6 | 35 |
| 7 | 34 |
| 8 | 33 |
| 9 | 32 |
| 10 | 31 |
| 11 | 31 |
| 12 | 30 |
| 13 | 29 |
| 14 | 28 |
| 15 | 28 |
| 16 | 27 |
| 17 | 27 |
| 18 | 27 |
| 19 | 26 |
| 20 | 26 |
| 21 | 26 |
| 22 | 26 |
| 23 | 26 |
| 24 | 25 |
| 25 | 25 |
| 26 | 25 |
| 27 | 25 |
| 28 | 25 |
| 29 | 24 |
| 30 | 24 |
| 31 | 24 |
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 43% of days. Sticky, muggy-or-worse air turns up on roughly 11% 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 (%) | 14 | 15 | 17 | 18 | 20 | 22 | 24 | 26 | 29 | 31 | 33 | 36 | 38 | 40 | 42 | 44 | 46 | 48 | 50 | 53 | 55 | 57 | 58 | 59 | 62 | 62 | 64 | 66 | 67 | 69 | 70 |
| Comfortable (%) | 25 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 27 | 27 | 27 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 25 | 25 | 24 | 24 | 23 | 22 | 21 | 21 | 20 |
| Humid (%) | 33 | 33 | 32 | 32 | 32 | 31 | 30 | 29 | 28 | 27 | 25 | 24 | 23 | 22 | 22 | 21 | 20 | 19 | 17 | 16 | 15 | 14 | 14 | 13 | 12 | 12 | 11 | 10 | 10 | 9 | 9 |
| Muggy (%) | 20 | 19 | 18 | 17 | 16 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 8 | 7 | 6 | 6 | 5 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 1 | 1 |
| Oppressive (%) | 8 | 7 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 14 | 25 | 33 | 20 | 8 |
| 2 | 15 | 26 | 33 | 19 | 7 |
| 3 | 17 | 26 | 32 | 18 | 7 |
| 4 | 18 | 26 | 32 | 17 | 6 |
| 5 | 20 | 26 | 32 | 16 | 6 |
| 6 | 22 | 27 | 31 | 16 | 5 |
| 7 | 24 | 27 | 30 | 15 | 5 |
| 8 | 26 | 27 | 29 | 14 | 4 |
| 9 | 29 | 27 | 28 | 13 | 4 |
| 10 | 31 | 27 | 27 | 12 | 3 |
| 11 | 33 | 27 | 25 | 11 | 3 |
| 12 | 36 | 28 | 24 | 10 | 3 |
| 13 | 38 | 27 | 23 | 9 | 2 |
| 14 | 40 | 27 | 22 | 8 | 2 |
| 15 | 42 | 27 | 22 | 8 | 2 |
| 16 | 44 | 27 | 21 | 7 | 1 |
| 17 | 46 | 27 | 20 | 6 | 1 |
| 18 | 48 | 27 | 19 | 6 | 1 |
| 19 | 50 | 27 | 17 | 5 | 1 |
| 20 | 53 | 26 | 16 | 4 | 1 |
| 21 | 55 | 26 | 15 | 4 | 0 |
| 22 | 57 | 26 | 14 | 3 | 0 |
| 23 | 58 | 25 | 14 | 3 | 0 |
| 24 | 59 | 25 | 13 | 3 | 0 |
| 25 | 62 | 24 | 12 | 2 | 0 |
| 26 | 62 | 24 | 12 | 2 | 0 |
| 27 | 64 | 23 | 11 | 2 | 0 |
| 28 | 66 | 22 | 10 | 2 | 0 |
| 29 | 67 | 21 | 10 | 2 | 0 |
| 30 | 69 | 21 | 9 | 1 | 0 |
| 31 | 70 | 20 | 9 | 1 | 0 |
Wind in October
Winds average 15 km/h in October.
Across October, daily wind ranges from about 15 km/h on the calmest days to 15 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) | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 15 | light breeze |
| 2 | 15 | light breeze |
| 3 | 15 | light breeze |
| 4 | 15 | light breeze |
| 5 | 15 | light breeze |
| 6 | 15 | light breeze |
| 7 | 15 | light breeze |
| 8 | 15 | light breeze |
| 9 | 15 | light breeze |
| 10 | 15 | light breeze |
| 11 | 15 | light breeze |
| 12 | 15 | light breeze |
| 13 | 15 | light breeze |
| 14 | 15 | light breeze |
| 15 | 15 | light breeze |
| 16 | 15 | light breeze |
| 17 | 15 | light breeze |
| 18 | 15 | light breeze |
| 19 | 15 | light breeze |
| 20 | 15 | light breeze |
| 21 | 15 | light breeze |
| 22 | 15 | light breeze |
| 23 | 15 | light breeze |
| 24 | 15 | light breeze |
| 25 | 15 | light breeze |
| 26 | 15 | light breeze |
| 27 | 15 | light breeze |
| 28 | 15 | light breeze |
| 29 | 15 | light breeze |
| 30 | 15 | light breeze |
| 31 | 15 | light breeze |
Sunrise & sunset in October
Daylight runs from about 11 h 42 min at the start of October to 10 h 36 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 66 minutes over October. Sunrise moves from 6:01 AM to 6:28 AM, and sunset from 5:41 PM to 5:04 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) | 11.7 | 11.6 | 11.6 | 11.5 | 11.5 | 11.5 | 11.4 | 11.4 | 11.4 | 11.3 | 11.3 | 11.3 | 11.2 | 11.2 | 11.1 | 11.1 | 11.1 | 11.0 | 11.0 | 11.0 | 10.9 | 10.9 | 10.9 | 10.8 | 10.8 | 10.8 | 10.7 | 10.7 | 10.7 | 10.6 | 10.6 |
| Sunrise (AM) | 6:01 | 6:02 | 6:03 | 6:04 | 6:05 | 6:05 | 6:06 | 6:07 | 6:08 | 6:09 | 6:10 | 6:10 | 6:11 | 6:12 | 6:13 | 6:14 | 6:15 | 6:16 | 6:17 | 6:17 | 6:18 | 6:19 | 6:20 | 6:21 | 6:22 | 6:23 | 6:24 | 6:25 | 6:26 | 6:27 | 6:28 |
| Sunset (PM) | 5:41 | 5:39 | 5:38 | 5:36 | 5:35 | 5:34 | 5:32 | 5:31 | 5:30 | 5:28 | 5:27 | 5:26 | 5:24 | 5:23 | 5:22 | 5:20 | 5:19 | 5:18 | 5:17 | 5:16 | 5:14 | 5:13 | 5:12 | 5:11 | 5:10 | 5:09 | 5:08 | 5:07 | 5:06 | 5:05 | 5:04 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.7 | 6:01 | 5:41 |
| 2 | 11.6 | 6:02 | 5:39 |
| 3 | 11.6 | 6:03 | 5:38 |
| 4 | 11.5 | 6:04 | 5:36 |
| 5 | 11.5 | 6:05 | 5:35 |
| 6 | 11.5 | 6:05 | 5:34 |
| 7 | 11.4 | 6:06 | 5:32 |
| 8 | 11.4 | 6:07 | 5:31 |
| 9 | 11.4 | 6:08 | 5:30 |
| 10 | 11.3 | 6:09 | 5:28 |
| 11 | 11.3 | 6:10 | 5:27 |
| 12 | 11.3 | 6:10 | 5:26 |
| 13 | 11.2 | 6:11 | 5:24 |
| 14 | 11.2 | 6:12 | 5:23 |
| 15 | 11.1 | 6:13 | 5:22 |
| 16 | 11.1 | 6:14 | 5:20 |
| 17 | 11.1 | 6:15 | 5:19 |
| 18 | 11.0 | 6:16 | 5:18 |
| 19 | 11.0 | 6:17 | 5:17 |
| 20 | 11.0 | 6:17 | 5:16 |
| 21 | 10.9 | 6:18 | 5:14 |
| 22 | 10.9 | 6:19 | 5:13 |
| 23 | 10.9 | 6:20 | 5:12 |
| 24 | 10.8 | 6:21 | 5:11 |
| 25 | 10.8 | 6:22 | 5:10 |
| 26 | 10.8 | 6:23 | 5:09 |
| 27 | 10.7 | 6:24 | 5:08 |
| 28 | 10.7 | 6:25 | 5:07 |
| 29 | 10.7 | 6:26 | 5:06 |
| 30 | 10.6 | 6:27 | 5:05 |
| 31 | 10.6 | 6:28 | 5:04 |
Solar energy in October
Average shortwave solar energy reaching the ground each day in October, about 3.66 kWh/m².
For context, solar energy here swings from a low near 2.43 kWh/m² to a high of 5.75 kWh/m² in May across the year — October's 3.66 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) | 4.0 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 | 3.7 | 3.6 | 3.6 | 3.6 | 3.6 | 3.5 | 3.5 | 3.5 | 3.5 | 3.4 | 3.4 | 3.4 | 3.4 | 3.3 | 3.3 | 3.3 |
| 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 | 4.0 | Moderate |
| 2 | 3.9 | Moderate |
| 3 | 3.9 | Moderate |
| 4 | 3.9 | Moderate |
| 5 | 3.9 | Moderate |
| 6 | 3.9 | Moderate |
| 7 | 3.8 | Moderate |
| 8 | 3.8 | Moderate |
| 9 | 3.8 | Moderate |
| 10 | 3.8 | Moderate |
| 11 | 3.8 | Moderate |
| 12 | 3.8 | Moderate |
| 13 | 3.7 | Moderate |
| 14 | 3.7 | Moderate |
| 15 | 3.7 | Moderate |
| 16 | 3.7 | Moderate |
| 17 | 3.6 | Moderate |
| 18 | 3.6 | Moderate |
| 19 | 3.6 | Moderate |
| 20 | 3.6 | Moderate |
| 21 | 3.5 | Moderate |
| 22 | 3.5 | Moderate |
| 23 | 3.5 | Moderate |
| 24 | 3.5 | Moderate |
| 25 | 3.4 | Moderate |
| 26 | 3.4 | Moderate |
| 27 | 3.4 | Moderate |
| 28 | 3.4 | Moderate |
| 29 | 3.3 | Moderate |
| 30 | 3.3 | Moderate |
| 31 | 3.3 | Moderate |
Hazard calendar for Aioi
In October, Aioi sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Aioi sits in the Pacific typhoon belt; the season peaks July–October.
Is October a good time to visit Aioi?
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 Aioi for sightseeing.
What to pack for Aioi in October
From October's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In October, Aioi sees daytime highs around 21°C and nights near 17°C. Worth packing: rain gear. About 9 days see rain.
Sea temperature near Aioi in October
The nearest coast averages about 24°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 22 km away) is warmest in August at about 27°C and coldest in February near 13°C.
It's comfortable for a long swim from Jun 7 to Nov 12 — 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) | 14 | 13 | 13 | 15 | 17 | 21 | 25 | 27 | 26 | 24 | 20 | 16 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Warm | Warm | Refreshing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 14 | Bracing |
| Feb | 13 | Bracing |
| Mar | 13 | Bracing |
| Apr | 15 | Bracing |
| May | 17 | Cool |
| Jun | 21 | Refreshing |
| Jul | 25 | Warm |
| Aug | 27 | Warm |
| Sep | 26 | Warm |
| Oct | 24 | Refreshing |
| Nov | 20 | Cool |
| Dec | 16 | Cool |
UV index in Aioi in October
Clear-sky midday UV in October peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Aioi peaks around July 13 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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) | 3 | 4 | 5 | 7 | 8 | 10 | 10 | 9 | 9 | 6 | 4 | 2 |
| Level | Moderate | Moderate | High | High | Very high | Very high | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | High |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 10 | Very high |
| Jul | 10 | Extreme |
| Aug | 9 | Very high |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 2 | Moderate |
Air quality in Aioi 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 Aioi is worst in April — around 23 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (October, 12 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 | 17 | 21 | 23 | 20 | 18 | 15 | 15 | 13 | 12 | 13 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 15 | Moderate |
| Feb | 17 | Moderate |
| Mar | 21 | Moderate |
| Apr | 23 | Moderate |
| May | 20 | Moderate |
| Jun | 18 | Moderate |
| Jul | 15 | Moderate |
| Aug | 15 | Moderate |
| Sep | 13 | Moderate |
| Oct | 12 | Moderate |
| Nov | 13 | Moderate |
| Dec | 13 | Moderate |
Where is Aioi?
Aioi sits at 34.8°N, 134.5°E, 8 m above sea level, in Japan. The nearest listed city is Tatsuno, 8.0 km away.
Topography around Aioi
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Aioi.
Within 3 km, the terrain around Aioi has significant variations in elevation — a maximum elevation change of 320 m around an average of 74 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 517 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,489 m.
The land around Aioi is covered by trees (65%) and artificial surfaces (22%) within 3 km, trees (48%) and water (30%) within 16 km, and trees (59%) and water (27%) 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 Aioi (34.8036°, 134.4681°, elevation 8 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).