Honeymoon in Mauritius !

[skipper]

Hello,
We are booking to come and stay at the Sofitel Imperial in Flic en Flac next September for a 2 week honeymoon. My partner is worried as she has heard that it can rain that time of year and will be very worried if she does not come back with a nice tan.
Can anyone advise the weather for that time of year, I know a jumper or long sleeves are required for evenings. !
Also, does anyone know anything about the Sofitel Imperial ?