The sun is shining in Quito Ecuador! You would think that coming from the coast to the Andes the weather would be worse, but the sun came out every day in Quito for hours at a time, which warmed us up and it was great.
Now about the beaches. If you don't mind cloudy and sometimes a little bit chilly along the southern and central Ecuador coastline then go to the beach August through October. We still had a wonderful time adventuring along the Ecuador coast. The weather is still really nice along beach this time of year, even if it is mostly overcast; its not too humid and not too hot.