They again peak just before sun up. Also, the mosquito population is usually highest about a week after heavy rains, during the summer months. Try to plan outside activities before dark. If not, apply insect repellent. Also, repair or replace any torn window screens.
Studies show that citronella candles and mosquito repellent coils help.
Neither are electronic sound devices. Here are some solutions to fight against mosquitoes. Remove or cover water containers. Change pet water, potted plant saucers, and birdbaths frequently. Cover barrels, boats, tires.