Indiana Mosquito Forecast

Indiana sees moderate mosquito pressure, shaped by a temperate, humid climate and about 43" of rain a year. Activity builds through the warm months and runs from May through September.

Tap any city on the map above, or open the full Indiana map →

When is mosquito season in Indiana?

Indiana's mosquito season runs from May through September. Activity ramps up once overnight lows hold above about 50°F, and surges in the two to three days after rain, when fresh standing water triggers a new hatch. Hot, dry stretches briefly knock numbers back before the next rain refills the breeding sites.

Where are mosquitoes worst in Indiana?

Within Indiana, the most consistent pressure tends to land around Indianapolis, Fort Wayne, and Evansville. Urban heat plus abundant standing water — storm drains, retention ponds, backyards — concentrates activity around these metros. Anywhere near rivers, marshes, lakes, or recent flooding will read higher than the surrounding area — exactly the kind of local detail the live map above is built to show.

How the Indiana forecast works

MosquitoCast estimates Indiana's mosquito activity from live weather — temperature, humidity, wind, and recent rainfall — layered on the area's long-term rainfall climate, elevation, and terrain, and refreshed every day from NOAA's forecast data. It's the same model nationwide, so the reading for Indiana is directly comparable to anywhere else in the country.