Hi Mike
the weather is warm enough for swimming and stay on the beach,and not to hote, for activitys like excursions on the day.
Only in the night , you need a light jacket.
I was often from the middle of september in mauritius.
The hotels are both good 3* houses,only the beach is not long, so long as the hotel.
Here is the website
www.coindemire-hotel.com
from there you will find the sisterhotels.
For some informations about the island, take a look to my site.
www.mauritiustipps.de.vu
or you can ask again or send my a mail.
greetings and nice holidys
anne