Forecasts and bulletins
Status key ecmwf_seas5_asia {base_time, charts: [{id, kind, season, url, how_to_read}], climate_period}.
Limits. Monthly; probabilities, not amounts.
How to read it
Brown = drier favoured, green = wetter, white = no signal (rain); orange/red warmer, blue colder (temperature). Darker = more likely.
Why it matters for Koh Samui
Tells whether the monsoon and dry season ahead lean dry or hot over southern Thailand.
ENSO status now
- ONI (NOAA CPC)
- +1.80 °C, JJA 2026 (previous +1.39 °C)
- RONI (NOAA CPC)
- +1.36 °C, JJA 2026
- Nino 3.4 weekly (NOAA CPC / OISST)
- +3.0 °C anomaly, week of 16 Sep 2026 (SST 29.6 °C)