Every year in late summer or autumn there is a proliferation of mosquitoes and cockroaches throughout the Mediterranean. There is nothing special about that. As soon as the temperatures drop in winter, however, the pests get their act together.
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So until it's cool enough to see your breath at night, mosquitoes will be a threat. In an interesting switch, mosquitos are more active during the day in the fall instead of becoming more active at dusk and night during the summer.
It's Not Cold Enough YetThe most straightforward reason mosquitos are still around in October is that it isn't cold enough to kill them yet. Just as ticks become dormant when the temperatures drop to 40 degrees, mosquitos will remain a threat until 50 degrees.
Areas to avoidIf you're after something more relaxed, do stay away from Magaluf and Palma Nova as these places are where you'll find a lot of the 18-30's groups, along with English-style pubs, a big drinking culture and all-night parties. They are also jam-packed during the peak tourism months of July and August.
Generally speaking, mosquitoes are most active around sunrise and sunset. They rarely come out during the middle of the day when the sun is out, since direct sunlight and high midday temperatures can quickly dehydrate them.
Most mosquito species in the U.S. increase activity from dusk to dawn, which means you're more likely to get bit if you step outside at that time. People who spend time or live near wooded areas, wetlands or shaded places with standing water, a breeding ground for mosquitoes, are at increased risk of bug bites.