cpc.ncep.noaa.gov
There is a 63% chance of a very strong El Niño during November-January that would rank among the largest El Niño events in the historical record going back to 1950.
The latest weekly Niño-3.4 index value was +0.7°C, with the westernmost (Niño-4) and easternmost (Niño-1+2) indices at +0.7°C and +2.1°C, respectively.
ENSO Diagnostic Discussion - Climate Prediction Center (.gov)