Mosquito activity is driven by temperature and standing water availability. In most of the US, activity begins when temperatures consistently stay above 50°F (10°C) — typically April in the South, May–June in the Midwest and Northeast. Activity peaks in summer and ends with the first sustained cold snap.
Most common species (Culex, Aedes) are most active at dawn and dusk. Asian tiger mosquitoes (Aedes albopictus) are day-biters and increasingly common in the Eastern US. Peak biting corresponds to low wind, high humidity, and low light.
In the US, the main mosquito-borne disease concerns are West Nile virus (Culex mosquitoes, summer through fall), Eastern equine encephalitis (EEE) in wet woodland areas, and locally transmitted dengue or Zika in southern Florida and Texas. Check CDC travel advisories for international destinations. Not medical advice.
Activity data derived from temperature, humidity, and precipitation models. Disease risk data via CDC Mosquitoes. Location used only to fetch your forecast, never stored.
Know when mosquito season starts, when activity spikes to High, and when you're finally in the clear — before you need to check.