Heat Advisory
HEAT ADVISORY REMAINS IN EFFECT UNTIL 5 PM AST THIS AFTERNOON
Heat Advisory map: active heat advisories now
1 heat advisory is in effect right now for parts of Puerto Rico.
Hot and humid conditions will raise the heat index enough to cause heat illness for people without cooling.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
Map data: NWS, OpenFreeMap, OpenStreetMap
Active heat advisories
Puerto Rico 1
What is a heat advisory?
A heat advisory is issued when the heat index, which combines temperature and humidity, is expected to reach levels that can cause heat exhaustion or heat stroke. Thresholds vary across the country because people adapt to their local climate: offices in the Gulf Coast use higher values than those in the Northeast or Pacific Northwest.
Heat is the leading weather-related killer in the United States in most years. Older adults, young children, outdoor workers and people without air conditioning are most at risk, and hot nights that do not cool off make it worse.
What to do
- Drink plenty of water and limit strenuous activity outdoors.
- Spend time in air conditioning; public libraries and cooling centers can help.
- Never leave children or pets in parked cars.
- Learn the signs of heat exhaustion and heat stroke.
How often heat advisories are issued
From 2016 through 2025 the National Weather Service issued an average of 855 heat advisories per year across the country, and 1,555 so far in 2026. Each count is one alert event, which can cover one or many counties.
States with the most heat advisories
| State | Average per year |
|---|---|
| Texas | 173.8 |
| Arkansas | 89.7 |
| Oklahoma | 69.3 |
| Louisiana | 65.7 |
| Mississippi | 65 |
| Florida | 62.6 |
| Kansas | 57.4 |
| California | 47.7 |
| Missouri | 47.7 |
| North Carolina | 41.8 |
| Puerto Rico | 39.2 |
| Alabama | 36.7 |
| Georgia | 35.9 |
| Nebraska | 30.8 |
| New York | 29.5 |
Heat Advisories by state
- Alabama
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- District of Columbia
- Florida
- Georgia
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Puerto Rico1
Related alerts
Frequently asked questions
What heat index triggers a heat advisory?
It varies by region. Many offices use a heat index of about 100 to 105°F, while hotter regions use higher thresholds.
What is the difference between a heat advisory and an extreme heat warning?
An extreme heat warning is for more dangerous, often longer-lasting heat. A heat advisory is for heat that can still make people sick.