Geoje weather in September
In September, Geoje sees average daytime highs of 24°C and overnight lows near 22°C, with 173 mm of rain across 9 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 25°C in the first days to 22°C by the end. The sky is clear or mostly clear about 37% of the time in September, and the air most often feels muggy.
Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Geoje's 9th-clearest and 5th-windiest month. For the whole year in context, see Geoje's year-round climate.
- Daytime high
- 24°
- 3rd warmest
- Overnight low
- 22°
- 10th coldest
- Rainfall
- 173 mm
- 9 wet days
- Daylight
- 12 h 12 min
- 6:13 AM – 6:26 PM
- Cloud cover
- 56%
- 9th clearest
- Wind
- 24 km/h
- 5th windiest
- Solar energy
- 4.36 kWh/m²
- Travel score
- 7.0
- out of 10
Temperature in September
Highs ease over the month, from about 25°C in the first days to 22°C by the end.
A typical September day in Geoje reaches about 24°C in the afternoon and slips back to 22°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 26°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) | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 |
| Avg low (°C) | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 26 | 24 |
| 2 | 25 | 24 |
| 3 | 25 | 24 |
| 4 | 25 | 24 |
| 5 | 25 | 24 |
| 6 | 25 | 23 |
| 7 | 25 | 23 |
| 8 | 25 | 23 |
| 9 | 25 | 23 |
| 10 | 25 | 23 |
| 11 | 25 | 23 |
| 12 | 24 | 23 |
| 13 | 24 | 23 |
| 14 | 24 | 23 |
| 15 | 24 | 22 |
| 16 | 24 | 22 |
| 17 | 24 | 22 |
| 18 | 24 | 22 |
| 19 | 24 | 22 |
| 20 | 23 | 22 |
| 21 | 23 | 22 |
| 22 | 23 | 21 |
| 23 | 23 | 21 |
| 24 | 23 | 21 |
| 25 | 23 | 21 |
| 26 | 23 | 21 |
| 27 | 23 | 21 |
| 28 | 22 | 21 |
| 29 | 22 | 20 |
| 30 | 22 | 20 |
How September really feels in Geoje
Once humidity and wind are folded in, September 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.
September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Geoje 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 | 8° / 4° | 42 | 5.2 | 9.9 | 1.5 |
| Feb | 9° / 5° | 51 | 5.6 | 10.7 | 2.0 |
| Mar | 11° / 8° | 97 | 8.3 | 11.7 | 3.1 |
| Apr | 14° / 12° | 127 | 8.5 | 12.8 | 4.5 |
| May | 17° / 16° | 132 | 8 | 13.8 | 5.9 |
| Jun | 20° / 19° | 180 | 9.6 | 14.3 | 6.2 |
| Jul | 24° / 23° | 240 | 11.8 | 14.1 | 6.4 |
| Aug | 26° / 25° | 187 | 11.6 | 13.3 | 6.5 |
| Sep | 24° / 22° | 173 | 9 | 12.2 | 7.0 |
| Oct | 20° / 18° | 78 | 5.2 | 11.1 | 7.3 |
| Nov | 15° / 12° | 59 | 6 | 10.2 | 5.3 |
| Dec | 10° / 6° | 39 | 4.8 | 9.7 | 2.8 |
Cloud cover in September
The sky is clear or mostly clear about 37% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 50%. 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 44 | 45 | 44 | 44 | 45 | 46 | 46 | 47 | 46 | 47 | 47 | 48 | 48 | 49 | 49 | 50 | 50 | 52 | 52 | 52 | 53 | 53 | 53 | 54 | 54 | 55 | 55 | 55 | 55 | 56 |
| Cloudier (%) | 56 | 55 | 56 | 56 | 55 | 54 | 54 | 53 | 54 | 53 | 53 | 52 | 52 | 51 | 51 | 50 | 50 | 48 | 48 | 48 | 47 | 47 | 47 | 46 | 46 | 45 | 45 | 45 | 45 | 44 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 44 | 56 |
| 2 | 45 | 55 |
| 3 | 44 | 56 |
| 4 | 44 | 56 |
| 5 | 45 | 55 |
| 6 | 46 | 54 |
| 7 | 46 | 54 |
| 8 | 47 | 53 |
| 9 | 46 | 54 |
| 10 | 47 | 53 |
| 11 | 47 | 53 |
| 12 | 48 | 52 |
| 13 | 48 | 52 |
| 14 | 49 | 51 |
| 15 | 49 | 51 |
| 16 | 50 | 50 |
| 17 | 50 | 50 |
| 18 | 52 | 48 |
| 19 | 52 | 48 |
| 20 | 52 | 48 |
| 21 | 53 | 47 |
| 22 | 53 | 47 |
| 23 | 53 | 47 |
| 24 | 54 | 46 |
| 25 | 54 | 46 |
| 26 | 55 | 45 |
| 27 | 55 | 45 |
| 28 | 55 | 45 |
| 29 | 55 | 45 |
| 30 | 56 | 44 |
Chance of precipitation in September
Geoje gets around 173 mm of rain over 9 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 30% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 37 | 36 | 36 | 36 | 35 | 35 | 35 | 35 | 35 | 34 | 34 | 34 | 33 | 32 | 31 | 31 | 30 | 29 | 28 | 27 | 26 | 26 | 25 | 25 | 24 | 24 | 23 | 23 | 22 | 22 |
| Rain chance (%) | |
|---|---|
| 1 | 37 |
| 2 | 36 |
| 3 | 36 |
| 4 | 36 |
| 5 | 35 |
| 6 | 35 |
| 7 | 35 |
| 8 | 35 |
| 9 | 35 |
| 10 | 34 |
| 11 | 34 |
| 12 | 34 |
| 13 | 33 |
| 14 | 32 |
| 15 | 31 |
| 16 | 31 |
| 17 | 30 |
| 18 | 29 |
| 19 | 28 |
| 20 | 27 |
| 21 | 26 |
| 22 | 26 |
| 23 | 25 |
| 24 | 25 |
| 25 | 24 |
| 26 | 24 |
| 27 | 23 |
| 28 | 23 |
| 29 | 22 |
| 30 | 22 |
Humidity in September
Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the muggy band about 33% of days. Sticky, muggy-or-worse air turns up on roughly 58% 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 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 6 | 7 | 8 | 9 | 10 | 12 | 13 | 15 | 16 | 18 |
| Comfortable (%) | 1 | 1 | 1 | 1 | 2 | 2 | 3 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 11 | 12 | 13 | 15 | 16 | 17 | 18 | 20 | 21 | 22 | 23 | 25 | 26 | 27 | 27 | 28 |
| Humid (%) | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 17 | 18 | 19 | 21 | 22 | 24 | 25 | 26 | 28 | 29 | 30 | 31 | 32 | 33 | 33 | 34 | 34 | 34 | 33 | 34 | 33 | 33 | 32 |
| Muggy (%) | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 42 | 42 | 42 | 41 | 40 | 39 | 38 | 36 | 35 | 34 | 33 | 31 | 30 | 29 | 27 | 26 | 24 | 23 | 22 | 20 | 19 | 18 | 17 |
| Oppressive (%) | 33 | 32 | 31 | 31 | 30 | 29 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 18 | 17 | 16 | 14 | 13 | 12 | 11 | 9 | 8 | 8 | 7 | 6 | 5 | 5 |
| Miserable (%) | 22 | 20 | 18 | 16 | 14 | 13 | 11 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 0 | 1 | 9 | 36 | 33 | 22 |
| 2 | 0 | 1 | 10 | 37 | 32 | 20 |
| 3 | 0 | 1 | 11 | 38 | 31 | 18 |
| 4 | 0 | 1 | 12 | 39 | 31 | 16 |
| 5 | 0 | 2 | 13 | 40 | 30 | 14 |
| 6 | 0 | 2 | 14 | 41 | 29 | 13 |
| 7 | 1 | 3 | 15 | 42 | 29 | 11 |
| 8 | 1 | 3 | 17 | 42 | 28 | 9 |
| 9 | 1 | 4 | 18 | 42 | 27 | 8 |
| 10 | 1 | 5 | 19 | 42 | 26 | 7 |
| 11 | 1 | 6 | 21 | 41 | 25 | 6 |
| 12 | 1 | 7 | 22 | 40 | 24 | 5 |
| 13 | 2 | 8 | 24 | 39 | 23 | 4 |
| 14 | 2 | 9 | 25 | 38 | 22 | 3 |
| 15 | 3 | 11 | 26 | 36 | 21 | 3 |
| 16 | 3 | 12 | 28 | 35 | 20 | 3 |
| 17 | 4 | 13 | 29 | 34 | 18 | 2 |
| 18 | 4 | 15 | 30 | 33 | 17 | 2 |
| 19 | 5 | 16 | 31 | 31 | 16 | 2 |
| 20 | 5 | 17 | 32 | 30 | 14 | 1 |
| 21 | 6 | 18 | 33 | 29 | 13 | 1 |
| 22 | 7 | 20 | 33 | 27 | 12 | 1 |
| 23 | 8 | 21 | 34 | 26 | 11 | 1 |
| 24 | 9 | 22 | 34 | 24 | 9 | 1 |
| 25 | 10 | 23 | 34 | 23 | 8 | 1 |
| 26 | 12 | 25 | 33 | 22 | 8 | 1 |
| 27 | 13 | 26 | 34 | 20 | 7 | 1 |
| 28 | 15 | 27 | 33 | 19 | 6 | 0 |
| 29 | 16 | 27 | 33 | 18 | 5 | 0 |
| 30 | 18 | 28 | 32 | 17 | 5 | 0 |
Wind in September
Winds average 24 km/h in September.
Across September, daily wind ranges from about 23 km/h on the calmest days to 24 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) | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
| Feels | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 23 | breezy |
| 2 | 23 | breezy |
| 3 | 23 | breezy |
| 4 | 23 | breezy |
| 5 | 23 | breezy |
| 6 | 23 | breezy |
| 7 | 23 | breezy |
| 8 | 23 | breezy |
| 9 | 23 | breezy |
| 10 | 23 | breezy |
| 11 | 24 | breezy |
| 12 | 24 | breezy |
| 13 | 24 | breezy |
| 14 | 24 | breezy |
| 15 | 24 | breezy |
| 16 | 24 | breezy |
| 17 | 24 | breezy |
| 18 | 24 | breezy |
| 19 | 24 | breezy |
| 20 | 24 | breezy |
| 21 | 24 | breezy |
| 22 | 24 | breezy |
| 23 | 24 | breezy |
| 24 | 24 | breezy |
| 25 | 24 | breezy |
| 26 | 24 | breezy |
| 27 | 24 | breezy |
| 28 | 24 | breezy |
| 29 | 24 | breezy |
| 30 | 24 | breezy |
Sunrise & sunset in September
Daylight runs from about 12 h 48 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 66 minutes over September. Sunrise moves from 6:02 AM to 6:24 AM, and sunset from 6:48 PM to 6:05 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) | 12.8 | 12.7 | 12.7 | 12.7 | 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 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.8 | 11.8 | 11.8 | 11.7 | 11.7 |
| Sunrise (AM) | 6:02 | 6:03 | 6:03 | 6:04 | 6:05 | 6:06 | 6:06 | 6:07 | 6:08 | 6:09 | 6:09 | 6:10 | 6:11 | 6:12 | 6:12 | 6:13 | 6:14 | 6:15 | 6:15 | 6:16 | 6:17 | 6:18 | 6:18 | 6:19 | 6:20 | 6:21 | 6:21 | 6:22 | 6:23 | 6:24 |
| Sunset (PM) | 6:48 | 6:46 | 6:45 | 6:44 | 6:42 | 6:41 | 6:39 | 6:38 | 6:36 | 6:35 | 6:33 | 6:32 | 6:30 | 6:29 | 6:27 | 6:26 | 6:24 | 6:23 | 6:21 | 6:20 | 6:18 | 6:17 | 6:16 | 6:14 | 6:13 | 6:11 | 6:10 | 6:08 | 6:07 | 6:05 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.8 | 6:02 | 6:48 |
| 2 | 12.7 | 6:03 | 6:46 |
| 3 | 12.7 | 6:03 | 6:45 |
| 4 | 12.7 | 6:04 | 6:44 |
| 5 | 12.6 | 6:05 | 6:42 |
| 6 | 12.6 | 6:06 | 6:41 |
| 7 | 12.5 | 6:06 | 6:39 |
| 8 | 12.5 | 6:07 | 6:38 |
| 9 | 12.5 | 6:08 | 6:36 |
| 10 | 12.4 | 6:09 | 6:35 |
| 11 | 12.4 | 6:09 | 6:33 |
| 12 | 12.4 | 6:10 | 6:32 |
| 13 | 12.3 | 6:11 | 6:30 |
| 14 | 12.3 | 6:12 | 6:29 |
| 15 | 12.3 | 6:12 | 6:27 |
| 16 | 12.2 | 6:13 | 6:26 |
| 17 | 12.2 | 6:14 | 6:24 |
| 18 | 12.1 | 6:15 | 6:23 |
| 19 | 12.1 | 6:15 | 6:21 |
| 20 | 12.1 | 6:16 | 6:20 |
| 21 | 12.0 | 6:17 | 6:18 |
| 22 | 12.0 | 6:18 | 6:17 |
| 23 | 12.0 | 6:18 | 6:16 |
| 24 | 11.9 | 6:19 | 6:14 |
| 25 | 11.9 | 6:20 | 6:13 |
| 26 | 11.8 | 6:21 | 6:11 |
| 27 | 11.8 | 6:21 | 6:10 |
| 28 | 11.8 | 6:22 | 6:08 |
| 29 | 11.7 | 6:23 | 6:07 |
| 30 | 11.7 | 6:24 | 6:05 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.36 kWh/m².
For context, solar energy here swings from a low near 2.64 kWh/m² to a high of 5.93 kWh/m² in May across the year — September's 4.36 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) | 4.7 | 4.6 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 |
| 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 | 4.7 | Bright |
| 2 | 4.6 | Bright |
| 3 | 4.6 | Bright |
| 4 | 4.6 | Bright |
| 5 | 4.6 | 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 | 4.4 | Bright |
| 17 | 4.3 | Bright |
| 18 | 4.3 | Bright |
| 19 | 4.3 | Bright |
| 20 | 4.3 | Bright |
| 21 | 4.3 | Bright |
| 22 | 4.3 | Bright |
| 23 | 4.3 | Bright |
| 24 | 4.3 | Bright |
| 25 | 4.2 | Bright |
| 26 | 4.2 | Bright |
| 27 | 4.2 | Bright |
| 28 | 4.2 | Bright |
| 29 | 4.2 | Bright |
| 30 | 4.2 | Bright |
Hazard calendar for Geoje
In September, Geoje sits inside its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.
Geoje sits in the Pacific typhoon belt; the season peaks July–October.
Geoje's rainy season runs April–September, when most of the year's rain falls.
Is September a good time to visit Geoje?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is one of the better times to visit Geoje for general sightseeing.
What to pack for Geoje in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Geoje sees daytime highs around 24°C and nights near 22°C. Worth packing: light clothes, rain gear and a windbreaker. About 9 days see rain.
Sea temperature near Geoje in September
The nearest coast averages about 25°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 17 km away) is warmest in August at about 26°C and coldest in February near 14°C.
It's comfortable for a long swim from Jun 17 to Nov 5 — about 4.7 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 15 | 14 | 14 | 15 | 17 | 20 | 23 | 26 | 25 | 22 | 19 | 17 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Warm | Warm | Refreshing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 15 | Bracing |
| Feb | 14 | Bracing |
| Mar | 14 | Bracing |
| Apr | 15 | Bracing |
| May | 17 | Cool |
| Jun | 20 | Refreshing |
| Jul | 23 | Refreshing |
| Aug | 26 | Warm |
| Sep | 25 | Warm |
| Oct | 22 | Refreshing |
| Nov | 19 | Cool |
| Dec | 17 | Cool |
UV index in Geoje in September
Clear-sky midday UV in September 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 Geoje peaks around August 20 at about 9 (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 | 6 | 7 | 8 | 8 | 8 | 9 | 9 | 6 | 4 | 2 |
| Level | Moderate | Moderate | High | 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 | 6 | High |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 9 | Very high |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 2 | Moderate |
Air quality in Geoje 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 Geoje is worst in April — around 37 µg/m³ PM2.5 (poor), about 2.2× the cleanest month (September, 17 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) | 23 | 27 | 35 | 37 | 35 | 27 | 20 | 19 | 17 | 17 | 21 | 19 |
| Level | Moderate | Moderate | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 23 | Moderate |
| Feb | 27 | Moderate |
| Mar | 35 | Poor |
| Apr | 37 | Poor |
| May | 35 | Poor |
| Jun | 27 | Moderate |
| Jul | 20 | Moderate |
| Aug | 19 | Moderate |
| Sep | 17 | Moderate |
| Oct | 17 | Moderate |
| Nov | 21 | Moderate |
| Dec | 19 | Moderate |
Where is Geoje?
Geoje sits at 34.8°N, 128.7°E, 11 m above sea level, in South Korea. The nearest listed city is Sinhyeon, 10 km away.
Topography around Geoje
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Geoje.
Within 3 km, the terrain around Geoje has significant variations in elevation — a maximum elevation change of 406 m around an average of 61 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 581 m; within 80 km, large variations in elevation — a maximum elevation change of 933 m.
The land around Geoje is covered by water (47%) and trees (43%) within 3 km, water (65%) and trees (28%) within 16 km, and water (62%) and trees (29%) within 80 km.
South Korea travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / F
- 220 V · 60 Hz
- Prices
- ≈ 57% of US
- price level, 2025
- GDP per capita
- $36,227
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.5
- per 100k, 2023
- Road deaths
- 8.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 522
- 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 Geoje (34.8138°, 128.7056°, elevation 11 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).