Try to stay indoors during dusk and dawn. These are the times of day that mosquitoes are most active.
There are two major characteristics that mosquitoes find appealing at dusk and dawn:
Reduced exposure to sun.
The intricate exoskeleton of the mosquito cannot handle much direct sunlight. Mosquitoes spend most of the midday hours in shaded areas under the foliage of trees and plants, and near standing water that is out of direct sunlight. Most yards are open to enough natural light through the day to keep mosquitoes at bay.
Mosquitoes favor temperatures no higher than 85 degrees F, and usually no lower than 55 degrees F (although there are exceptions).
If possible, avoid outdoor activities during these times of day.
If you have to be outside during these times of day, try using a Mosquito Repellent Fogger. Foggers are easy to use, can keep mosquitoes away for up to 6 hours and can be found at most grocery and home improvement stores. Remember to always follow directions on the label for use.