Jeju Province · South Korea
Jeju in September
In September, Jeju averages a daytime high of 26 °C and a night-time low of 20 °C, with about 198 mm of rain over the month. Jeju has no month that is both mild and dry by the measure used here.
- Average high
- 26 °C
- Average low
- 20 °C
- Rain in the month
- 198 mm
- Daylight on 15 Sep
- 12 h 20 min
- Comfortable month
- No
- Places to stay
- 109
When to go
How September compares with the rest of the year in Jeju
September is the 3rd warmest month in Jeju by average daytime high; across the year the highs run from 9 °C to 30 °C and the lows from 2 °C to 24 °C. By day, September is 3 °C cooler than August, and October is 4 °C cooler than September.
September brings 198 mm of rain, more than the monthly average of 144 mm (1734 mm a year); it is the 4th wettest month.
On 15 September the sun is up for about 12 h 20 min, against 10 h at the shortest and 14 h 20 min at the longest point of the year (calculated from the latitude, sunrise to sunset).
| Month | High | Low | Rain | Comfortable |
|---|---|---|---|---|
| January | 9 °C | 2 °C | 62 mm | |
| February | 10 °C | 3 °C | 74 mm | |
| March | 14 °C | 6 °C | 109 mm | |
| April | 18 °C | 9 °C | 120 mm | |
| May | 22 °C | 14 °C | 144 mm | |
| June | 25 °C | 18 °C | 222 mm | |
| July | 29 °C | 23 °C | 272 mm | |
| August | 30 °C | 24 °C | 306 mm | |
| September | 26 °C | 20 °C | 198 mm | |
| October | 22 °C | 15 °C | 99 mm | |
| November | 17 °C | 9 °C | 72 mm | |
| December | 11 °C | 4 °C | 55 mm |
Comfortable means average daytime high between 18 °C and 29 °C and under 80 mm of rain in the month. Averages for 1991–2020 over the surrounding area, a grid square about 50 km across, so a coast or a nearby mountain can make the town itself warmer or cooler. Data: CRU TS v4.10, Climatic Research Unit, University of East Anglia (Open Database License).
When to go
Is September a good time to visit Jeju?
Not by the measure used here: about 198 mm of rain is 80 mm or more. No month in Jeju meets it.
The measure is about weather for a city stay only; it says nothing about events, school holidays or prices.
Public holidays in South Korea in September
Nationwide public holidays; shops and offices may close on these dates.
Where to stay
Where to stay in Jeju
This guide lists 109 places to stay in Jeju, hotels recorded in Wikidata. By straight-line distance from the centre: under 1 km, 15; 1–3 km, 18; 3–10 km, 66; 10 km or more, 10.
Sources: climate from CRU TS v4.10 (Climatic Research Unit, University of East Anglia; Open Database License), 1991–2020 averages; day length calculated from the latitude; public holidays from python-holidays (MIT); places to stay from each operator's own public pages and Wikidata. How this guide is made.