Izumi weather in September
In September, Izumi sees average daytime highs of 28°C and overnight lows near 24°C, with 193 mm of rain across 13.2 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.
Highs ease over the month, from about 29°C in the first days to 26°C by the end. The sky is clear or mostly clear about 36% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Izumi's 3rd-clearest and 9th-windiest month. For the whole year in context, see Izumi's year-round climate.
- Daytime high
- 28°
- 3rd warmest
- Overnight low
- 24°
- 10th coldest
- Rainfall
- 193 mm
- 13.2 wet days
- Daylight
- 12 h 12 min
- 6:07 AM – 6:19 PM
- Cloud cover
- 58%
- 3rd clearest
- Wind
- 11 km/h
- 9th windiest
- Solar energy
- 4.31 kWh/m²
- Travel score
- 5.7
- out of 10
Izumi is city in Kagoshima Prefecture, Japan.
- Density
- 158/km²
- people per km²
- Founded
- 2006
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Highs ease over the month, from about 29°C in the first days to 26°C by the end.
A typical September day in Izumi reaches about 28°C in the afternoon and slips back to 24°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 30°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.
| 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) | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 |
| Avg low (°C) | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 29 | 25 |
| 2 | 29 | 25 |
| 3 | 29 | 25 |
| 4 | 29 | 25 |
| 5 | 29 | 25 |
| 6 | 29 | 25 |
| 7 | 29 | 25 |
| 8 | 29 | 25 |
| 9 | 28 | 24 |
| 10 | 28 | 24 |
| 11 | 28 | 24 |
| 12 | 28 | 24 |
| 13 | 28 | 24 |
| 14 | 28 | 24 |
| 15 | 28 | 24 |
| 16 | 28 | 24 |
| 17 | 28 | 23 |
| 18 | 27 | 23 |
| 19 | 27 | 23 |
| 20 | 27 | 23 |
| 21 | 27 | 23 |
| 22 | 27 | 23 |
| 23 | 27 | 23 |
| 24 | 27 | 22 |
| 25 | 27 | 22 |
| 26 | 26 | 22 |
| 27 | 26 | 22 |
| 28 | 26 | 22 |
| 29 | 26 | 22 |
| 30 | 26 | 22 |
How September really feels in Izumi
Once humidity and wind are folded in, September averages 6 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 September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Izumi weather by month
How September compares with the rest of the year at a glance. September is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 11° / 7° | 88 | 11.1 | 10.1 | 2.7 |
| Feb | 12° / 8° | 105 | 10.6 | 10.8 | 2.9 |
| Mar | 14° / 10° | 149 | 12.9 | 11.8 | 4.0 |
| Apr | 18° / 14° | 178 | 11.4 | 12.8 | 5.6 |
| May | 22° / 18° | 198 | 11.6 | 13.6 | 6.3 |
| Jun | 25° / 21° | 487 | 18.4 | 14.1 | 5.2 |
| Jul | 28° / 25° | 342 | 18.2 | 13.9 | 4.6 |
| Aug | 30° / 26° | 171 | 16 | 13.2 | 4.4 |
| Sep | 28° / 24° | 193 | 13.2 | 12.2 | 5.7 |
| Oct | 23° / 19° | 110 | 8.5 | 11.2 | 7.2 |
| Nov | 18° / 14° | 117 | 9.3 | 10.4 | 6.1 |
| Dec | 13° / 9° | 97 | 10.1 | 9.9 | 3.9 |
Cloud cover in September
The sky is clear or mostly clear about 36% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 49%.
| 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 (%) | 49 | 49 | 48 | 49 | 49 | 49 | 49 | 49 | 50 | 50 | 50 | 51 | 51 | 51 | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 53 | 53 | 54 | 54 | 54 | 54 |
| Cloudier (%) | 51 | 51 | 52 | 51 | 51 | 51 | 51 | 51 | 50 | 50 | 50 | 49 | 49 | 49 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 47 | 47 | 46 | 46 | 46 | 46 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 49 | 51 |
| 2 | 49 | 51 |
| 3 | 48 | 52 |
| 4 | 49 | 51 |
| 5 | 49 | 51 |
| 6 | 49 | 51 |
| 7 | 49 | 51 |
| 8 | 49 | 51 |
| 9 | 50 | 50 |
| 10 | 50 | 50 |
| 11 | 50 | 50 |
| 12 | 51 | 49 |
| 13 | 51 | 49 |
| 14 | 51 | 49 |
| 15 | 52 | 48 |
| 16 | 52 | 48 |
| 17 | 52 | 48 |
| 18 | 52 | 48 |
| 19 | 52 | 48 |
| 20 | 52 | 48 |
| 21 | 52 | 48 |
| 22 | 52 | 48 |
| 23 | 52 | 48 |
| 24 | 52 | 48 |
| 25 | 53 | 47 |
| 26 | 53 | 47 |
| 27 | 54 | 46 |
| 28 | 54 | 46 |
| 29 | 54 | 46 |
| 30 | 54 | 46 |
Chance of precipitation in September
Izumi gets around 193 mm of rain over 13.2 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 43% and peaks near 52% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 52 | 51 | 51 | 50 | 49 | 49 | 48 | 48 | 47 | 46 | 45 | 44 | 44 | 43 | 42 | 42 | 41 | 41 | 40 | 40 | 40 | 39 | 39 | 39 | 38 | 38 | 38 | 38 | 37 | 37 |
| Rain chance (%) | |
|---|---|
| 1 | 52 |
| 2 | 51 |
| 3 | 51 |
| 4 | 50 |
| 5 | 49 |
| 6 | 49 |
| 7 | 48 |
| 8 | 48 |
| 9 | 47 |
| 10 | 46 |
| 11 | 45 |
| 12 | 44 |
| 13 | 44 |
| 14 | 43 |
| 15 | 42 |
| 16 | 42 |
| 17 | 41 |
| 18 | 41 |
| 19 | 40 |
| 20 | 40 |
| 21 | 40 |
| 22 | 39 |
| 23 | 39 |
| 24 | 39 |
| 25 | 38 |
| 26 | 38 |
| 27 | 38 |
| 28 | 38 |
| 29 | 37 |
| 30 | 37 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 44% of days. Sticky, muggy-or-worse air turns up on roughly 82% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 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 | 2 | 2 | 2 | 3 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 6 | 6 | 7 | 7 | 8 | 9 | 10 | 10 | 11 | 12 | 13 | 14 |
| Humid (%) | 1 | 1 | 1 | 1 | 2 | 2 | 3 | 3 | 4 | 5 | 6 | 7 | 9 | 10 | 11 | 13 | 14 | 16 | 17 | 19 | 20 | 21 | 23 | 24 | 25 | 26 | 27 | 27 | 28 | 29 |
| Muggy (%) | 12 | 13 | 14 | 15 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 29 | 30 | 31 | 31 | 32 | 32 | 32 | 32 | 32 | 31 | 31 |
| Oppressive (%) | 53 | 54 | 55 | 56 | 56 | 57 | 56 | 57 | 56 | 56 | 55 | 53 | 51 | 50 | 48 | 46 | 44 | 42 | 40 | 38 | 36 | 34 | 32 | 30 | 28 | 27 | 25 | 24 | 23 | 22 |
| Miserable (%) | 34 | 32 | 30 | 28 | 27 | 25 | 23 | 21 | 20 | 18 | 17 | 16 | 15 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 5 | 5 | 4 | 4 | 3 | 3 | 3 | 2 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 0 | 0 | 1 | 12 | 53 | 34 |
| 2 | 0 | 0 | 1 | 13 | 54 | 32 |
| 3 | 0 | 0 | 1 | 14 | 55 | 30 |
| 4 | 0 | 0 | 1 | 15 | 56 | 28 |
| 5 | 0 | 0 | 2 | 15 | 56 | 27 |
| 6 | 0 | 0 | 2 | 16 | 57 | 25 |
| 7 | 0 | 1 | 3 | 17 | 56 | 23 |
| 8 | 0 | 1 | 3 | 18 | 57 | 21 |
| 9 | 0 | 1 | 4 | 19 | 56 | 20 |
| 10 | 0 | 1 | 5 | 20 | 56 | 18 |
| 11 | 0 | 1 | 6 | 21 | 55 | 17 |
| 12 | 0 | 2 | 7 | 22 | 53 | 16 |
| 13 | 0 | 2 | 9 | 23 | 51 | 15 |
| 14 | 0 | 3 | 10 | 24 | 50 | 13 |
| 15 | 0 | 3 | 11 | 25 | 48 | 12 |
| 16 | 0 | 4 | 13 | 26 | 46 | 11 |
| 17 | 1 | 4 | 14 | 27 | 44 | 10 |
| 18 | 1 | 5 | 16 | 28 | 42 | 9 |
| 19 | 1 | 6 | 17 | 29 | 40 | 8 |
| 20 | 1 | 6 | 19 | 29 | 38 | 7 |
| 21 | 1 | 7 | 20 | 30 | 36 | 6 |
| 22 | 1 | 7 | 21 | 31 | 34 | 5 |
| 23 | 1 | 8 | 23 | 31 | 32 | 5 |
| 24 | 1 | 9 | 24 | 32 | 30 | 5 |
| 25 | 1 | 10 | 25 | 32 | 28 | 4 |
| 26 | 1 | 10 | 26 | 32 | 27 | 4 |
| 27 | 2 | 11 | 27 | 32 | 25 | 3 |
| 28 | 2 | 12 | 27 | 32 | 24 | 3 |
| 29 | 2 | 13 | 28 | 31 | 23 | 3 |
| 30 | 3 | 14 | 29 | 31 | 22 | 2 |
Wind in September
Winds average 11 km/h in September.
Across September, daily wind ranges from about 11 km/h on the calmest days to 12 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) | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 12 | 12 |
| 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 | 11 | calm |
| 2 | 11 | calm |
| 3 | 11 | calm |
| 4 | 11 | calm |
| 5 | 11 | calm |
| 6 | 11 | calm |
| 7 | 11 | calm |
| 8 | 11 | calm |
| 9 | 11 | calm |
| 10 | 11 | calm |
| 11 | 11 | calm |
| 12 | 11 | calm |
| 13 | 11 | calm |
| 14 | 11 | calm |
| 15 | 11 | calm |
| 16 | 11 | calm |
| 17 | 11 | calm |
| 18 | 11 | calm |
| 19 | 11 | calm |
| 20 | 11 | calm |
| 21 | 11 | calm |
| 22 | 11 | calm |
| 23 | 11 | calm |
| 24 | 11 | calm |
| 25 | 11 | calm |
| 26 | 11 | calm |
| 27 | 11 | calm |
| 28 | 11 | calm |
| 29 | 12 | calm |
| 30 | 12 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 42 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 60 minutes over September. Sunrise moves from 5:58 AM to 6:16 AM, and sunset from 6:39 PM to 6:00 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) | 12.7 | 12.7 | 12.6 | 12.6 | 12.6 | 12.5 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 | 11.8 | 11.7 |
| Sunrise (AM) | 5:58 | 5:58 | 5:59 | 5:59 | 6:00 | 6:01 | 6:01 | 6:02 | 6:03 | 6:03 | 6:04 | 6:05 | 6:05 | 6:06 | 6:06 | 6:07 | 6:08 | 6:08 | 6:09 | 6:10 | 6:10 | 6:11 | 6:12 | 6:12 | 6:13 | 6:14 | 6:14 | 6:15 | 6:16 | 6:16 |
| Sunset (PM) | 6:39 | 6:38 | 6:36 | 6:35 | 6:34 | 6:32 | 6:31 | 6:30 | 6:28 | 6:27 | 6:26 | 6:24 | 6:23 | 6:21 | 6:20 | 6:19 | 6:17 | 6:16 | 6:15 | 6:13 | 6:12 | 6:10 | 6:09 | 6:08 | 6:06 | 6:05 | 6:04 | 6:02 | 6:01 | 6:00 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.7 | 5:58 | 6:39 |
| 2 | 12.7 | 5:58 | 6:38 |
| 3 | 12.6 | 5:59 | 6:36 |
| 4 | 12.6 | 5:59 | 6:35 |
| 5 | 12.6 | 6:00 | 6:34 |
| 6 | 12.5 | 6:01 | 6:32 |
| 7 | 12.5 | 6:01 | 6:31 |
| 8 | 12.5 | 6:02 | 6:30 |
| 9 | 12.4 | 6:03 | 6:28 |
| 10 | 12.4 | 6:03 | 6:27 |
| 11 | 12.4 | 6:04 | 6:26 |
| 12 | 12.3 | 6:05 | 6:24 |
| 13 | 12.3 | 6:05 | 6:23 |
| 14 | 12.3 | 6:06 | 6:21 |
| 15 | 12.2 | 6:06 | 6:20 |
| 16 | 12.2 | 6:07 | 6:19 |
| 17 | 12.2 | 6:08 | 6:17 |
| 18 | 12.1 | 6:08 | 6:16 |
| 19 | 12.1 | 6:09 | 6:15 |
| 20 | 12.1 | 6:10 | 6:13 |
| 21 | 12.0 | 6:10 | 6:12 |
| 22 | 12.0 | 6:11 | 6:10 |
| 23 | 12.0 | 6:12 | 6:09 |
| 24 | 11.9 | 6:12 | 6:08 |
| 25 | 11.9 | 6:13 | 6:06 |
| 26 | 11.9 | 6:14 | 6:05 |
| 27 | 11.8 | 6:14 | 6:04 |
| 28 | 11.8 | 6:15 | 6:02 |
| 29 | 11.8 | 6:16 | 6:01 |
| 30 | 11.7 | 6:16 | 6:00 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.31 kWh/m².
For context, solar energy here swings from a low near 2.3 kWh/m² to a high of 5.15 kWh/m² in May across the year — September's 4.31 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.1 | 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 |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.6 | Bright |
| 2 | 4.6 | Bright |
| 3 | 4.6 | Bright |
| 4 | 4.5 | Bright |
| 5 | 4.5 | Bright |
| 6 | 4.5 | 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 | 4.4 | Bright |
| 14 | 4.4 | Bright |
| 15 | 4.4 | Bright |
| 16 | 4.3 | Bright |
| 17 | 4.3 | Bright |
| 18 | 4.3 | Bright |
| 19 | 4.3 | Bright |
| 20 | 4.3 | Bright |
| 21 | 4.2 | Bright |
| 22 | 4.2 | 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 | 4.1 | Bright |
| 30 | 4.0 | Bright |
Hazard calendar for Izumi
In September, Izumi sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Izumi sits in the Pacific typhoon belt; the season peaks July–October.
Izumi's rainy season runs June–July, when most of the year's rain falls.
Is September a good time to visit Izumi?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Izumi for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Izumi in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Izumi sees daytime highs around 28°C and nights near 24°C. Pack light clothes. Worth having: rain gear. About 13 days see rain.
Sea temperature near Izumi in September
The nearest coast averages about 27°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 28°C and coldest in February near 16°C.
It's comfortable for a long swim from May 16 to Dec 4 — about 6.7 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 17 | 16 | 17 | 18 | 20 | 23 | 26 | 28 | 27 | 24 | 22 | 19 |
| Comfort | Cool | Cool | Cool | Cool | Refreshing | Refreshing | Warm | Warm | Warm | Warm | Refreshing | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 17 | Cool |
| Feb | 16 | Cool |
| Mar | 17 | Cool |
| Apr | 18 | Cool |
| May | 20 | Refreshing |
| Jun | 23 | Refreshing |
| Jul | 26 | Warm |
| Aug | 28 | Warm |
| Sep | 27 | Warm |
| Oct | 24 | Warm |
| Nov | 22 | Refreshing |
| Dec | 19 | Cool |
UV index in Izumi in September
Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Izumi peaks around July 10 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 5 | 7 | 8 | 8 | 10 | 11 | 9 | 10 | 6 | 5 | 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 | 7 | High |
| Apr | 8 | Very high |
| May | 8 | Very high |
| Jun | 10 | Extreme |
| Jul | 11 | Extreme |
| Aug | 9 | Very high |
| Sep | 10 | Very high |
| Oct | 6 | High |
| Nov | 5 | Moderate |
| Dec | 3 | Moderate |
Air quality in Izumi in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Izumi is worst in March — around 24 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (July, 13 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) | 17 | 20 | 24 | 24 | 22 | 18 | 13 | 14 | 14 | 14 | 16 | 15 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 17 | Moderate |
| Feb | 20 | Moderate |
| Mar | 24 | Moderate |
| Apr | 24 | Moderate |
| May | 22 | Moderate |
| Jun | 18 | Moderate |
| Jul | 13 | Moderate |
| Aug | 14 | Moderate |
| Sep | 14 | Moderate |
| Oct | 14 | Moderate |
| Nov | 16 | Moderate |
| Dec | 15 | Moderate |
Where is Izumi?
Izumi sits at 32.1°N, 130.4°E, 37 m above sea level, in Japan. The nearest listed city is Minamata, 15 km away.
Topography around Izumi
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Izumi.
Within 3 km, the terrain around Izumi has significant variations in elevation — a maximum elevation change of 357 m around an average of 86 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,063 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,718 m.
The land around Izumi is covered by trees (65%) and artificial surfaces (22%) within 3 km, trees (71%) within 16 km, and trees (48%) and water (45%) 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 Izumi (32.0833°, 130.3667°, elevation 37 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).