I found that the bad time for mossies was 5.30 to 7.00pm which unfortunately coincided with San Miguel o'clock. As mentioned 'Off' is readily available and seems to be effective but covering up is the most effective especially ankles. I too noticed a build up of resiliency over the years. Temperatures are pleasant that time of year (Visayas rarely varies from 28-32 all year) but there is no real dry season, just a less wet one.
