United States Temperature Today & 50-State Weather Directory

During summer months, southwestern desert states like Arizona, Nevada, and California record the nation's highest temperatures (frequently exceeding 105°F). In winter, northern states like North Dakota, Minnesota, and Alaska register the coldest temperatures, often falling below 0°F.

The polar jet stream serves as the primary boundary separating arctic Canadian air from warmer southern air. When it dips southward, it drives cold fronts deep into the central and eastern states; when it retreats north, warm Gulf moisture expands nationwide.

All city weather forecasts and real-time temperatures across the US directory are updated every 5 to 15 minutes using automated airport weather stations (ASOS/AWOS) and numerical weather prediction models.