Weather in Cheju in september
Climate normals based on 10 years of historical data for Cheju, Lõuna Korea.
Average high
25°C
Average low
22°C
Rainfall
337 mm
16 rainy days
Sunshine
2.4h/day
Niiskus
79%
Sea temperature
28.6°C
How Hot Is Cheju in september?
September in Cheju averages 25°C in the afternoon and 22°C overnight, with a typical daily mean of 24°C. A 4°C cooler reading than August, but next month (October) will drop further.
Sunshine Hours in september
Cloud cover keeps Cheju dim: 2.4h of sun, daylight from 6:15 am to 6:40 pm.
Does It Rain In Cheju In september?
Very wet conditions: Cheju averages 337mm across 16 days.
Is Cheju Humid In september?
Oppressive humidity dominates Cheju in September — averaging 79%, with the air feeling thick and heavy.
How Warm Is The Sea In Cheju In september?
Cheju's waters peak at 28.6°C in September — extremely warm, ideal for long swims.
Wind In Cheju In september
Wind picks up in Cheju during September — averaging 22 kph, with gustier afternoons.
Cloud Cover In Cheju In september
Cheju's September runs cloudy: typical cloud cover of 70%.
Cities With Similar Weather In september
Weather in Cheju, month by month
| Month | High / Low | Vihm | |
|---|---|---|---|
| Jaanuari ilm | 8°C / 4°C | 103mm | Details → |
| Veebruari ilm | 9°C / 4°C | 91mm | Details → |
| Märtsi ilm | 13°C / 8°C | 120mm | Details → |
| Aprilli ilm | 17°C / 12°C | 136mm | Details → |
| Mai ilm | 21°C / 15°C | 153mm | Details → |
| Juuni ilm | 24°C / 20°C | 244mm | Details → |
| Juuli ilm | 28°C / 24°C | 261mm | Details → |
| Augusti ilm | 29°C / 25°C | 231mm | Details → |
| Septembri ilm | 25°C / 22°C | 337mm | |
| Oktoobri ilm | 20°C / 17°C | 160mm | Details → |
| Novembri ilm | 16°C / 12°C | 130mm | Details → |
| Detsembri ilm | 10°C / 6°C | 97mm | Details → |