does anyone know where the temple is and if tourists are allowed in for services on the high holy days in september? will be there for Yum Kippur and would like to attend services thank you

Have you tried Googling "Venice synagogues?" There are 4 there - 3 are Ashkenazic and 1 is Sephardic.

I did a tour of the synagogues which are all concentrated in the old ghetto.

My guess is that you should try to arrange synagogue attendance through your own synagogue. Having attended just regular old Friday night services in various cities in Europe, I can tell you security will be very tight, especially for a foreigner who is not known by the local community members.

You will DEFINITELY not be allowed to just wander in to a synagogue on Yom Kippur without making arrangements in advance.

The synagogues are in the area sort of next to the train station. I think it is called the Ghetto (giving the word its name). If you go on the tour, you could ask your guide about attending friday night or Yom Kippur services. When I was there, the guides were very welcoming and invited us to join in Yom Kippur services (which we didn't for various reasons). I am not sure how you would make arrangements in advance to attend but if you can find a phone number for the synagogues (maybe look on the destinations section of this website), you could probably ask someone.

try this one: www.jewishitaly.org for more info- very good site
Levantine
Address:
Old Ghetto
Telephone:
+39.041.715012
Open: winter
Rabbi: Elia Richetti
Run by the Jewish Community of Venice.
in this site you will find more info

In the Ghetto of Venice (yes, that's the place the name comes from - ghetto is the Venetian word for foundry, which it was before it became the Jewish quarter), there are FIVE synagogues. Three are museums today (the Canton, German, and Italian synagogues); the two others can be visited, too, but are still in use, the Levantine in winter, and the Spanish synagogue in summer, i.e. also in September, of course. Strangers are welcome, as far as I know, but if you want to ask ahead, I'd call the Jewish museum, which is sort of the focal point of the Jewish community in Venice: +39-041-715359. (They're extremely unfriendly, so just don't be put off.)