I have visited Berlin twice in July and once in mid Sept. ( Prague in July)
We have to decide soon if we are going in mid May or second week in Oct.
If you have experienced either city that time of the year, your input would be appreciated.

May without a doubt. Days are extra long, weather is nice and most tourists aren;t on the move yet.

I would go in Matober - definitely.

Thanks,
So far 1:1

We have been to Prague in late October and loved it. The weather felt a lot like New England, crisp and changeable - my favorite way to tour

thanks again,...I don't mind cool , even cold.

No one likes rainy weather, but, of course, there is no telling.

Another vote for May. Weather is warmer, days are longer. If interested, check out the annual Prague Spring Music Festival, which runs May 12-June 4 next year.

Two years ago, we went to Berlin in May and October, I prefer October for the coolish weather and the German Reunification Fest on October 3.

Thanks again.

Personally, I would vote for May. I live in Prague and feel that the city is really being renewed at this time. The cherry blossom blanket of white on Petrin hill, the blooming lilacs and vibe of a city awakening from winter can't be beat.

By the way, I would never plan a trip to either city based on potential weather especially for these months. They can be real fickle. For example, we just had a sunny first two weeks of October followed by the standard foggy stuff in the second half. May too can have unexpected cold days as winter hangs on late sometimes.

As for fellow tourists and crowds, you can't escape them really unless you come when it's cold (i.e. Nov, Feb). In my opinion, May seems to be more popular than October while both months will be more crowded on the weekends.

Thanks,
I realize one cannot plan the weather.... I was more interested in the "feel". of he city which you described very well.