El Nino Watch
How closely NASA POWER and Open-Meteo ERA5 agree for Samui, day by day.
Forecasts and bulletins
For the days both have, the mean difference and mean absolute difference of daily maximum and minimum temperature and rain between NASA POWER and ERA5.
Limits. Both are coarse models; neither is a rain gauge on the island.
Small mean differences (under 1 degC) mean the two reanalyses agree. On 2026-09-24: max temperature +0.6 degC on average over 55 days; rain POWER 290 mm vs ERA5 189 mm.
When two independent sources agree, a drought or heat signal is more trustworthy.