Hurricane Season: Dates, Categories & Preparedness

What Is Hurricane Season?

Hurricane season is the period each year when tropical cyclones are most likely to form in a given ocean basin. In the United States, the phrase almost always refers to the Atlantic basin, which includes the Atlantic Ocean, the Caribbean Sea, and the Gulf of Mexico. Warm ocean water, low wind shear, and favorable atmospheric patterns come together during these months to fuel rotating storms that can grow from a tropical depression into a major hurricane in a matter of days.

For residents from Texas to Maine, and for communities across the Caribbean and Central America, understanding when the season peaks and how storms are classified is the foundation of sound planning. This guide covers the key dates, the Saffir-Simpson scale, and practical steps you can take before a storm threatens.

Atlantic Hurricane Season Dates You Should Know

The official Atlantic hurricane season runs from June 1 to November 30 each year, as defined by the National Hurricane Center (NHC), a division of the National Weather Service (NWS). That six-month window captures roughly 97% of tropical activity in the basin, but storms can and do form outside it. In recent years, the NHC has begun issuing routine tropical weather outlooks starting May 15, acknowledging that pre-season development is possible.

Activity is not evenly spread across those months. The season has a pronounced peak:

• June–July: Typically quieter, with development often in the Gulf of Mexico, the western Caribbean, or near the southeastern U.S. coast.
• Mid-August to late October: The statistical peak, when Cape Verde-type storms roll off Africa and long-track hurricanes become more common. September 10 is often cited as the climatological peak of the season.
• November: Activity shifts back toward the western Caribbean and Gulf, and storms tend to be weaker but can still be dangerous.

The Eastern Pacific season runs May 15 to November 30, and the Central Pacific season runs June 1 to November 30. If you live in Hawaii or along the Pacific coast, those are the dates that matter for you.

Hurricane Categories Explained

Once a tropical cyclone reaches sustained winds of 74 mph (119 km/h), it is classified as a hurricane. The Saffir-Simpson Hurricane Wind Scale then ranks it from Category 1 to Category 5 based on maximum sustained wind speed. The scale estimates potential property damage but does not account for storm surge, rainfall flooding, or tornadoes—which are often the deadliest hazards.

• Category 1: 74–95 mph (119–153 km/h). Dangerous winds will produce some damage; power outages can last days.
• Category 2: 96–110 mph (154–177 km/h). Extensive damage; many trees snapped or uprooted, near-total power loss expected.
• Category 3: 111–129 mph (178–208 km/h). Devastating damage; considered a major hurricane.
• Category 4: 130–156 mph (209–251 km/h). Catastrophic damage; most of the area will be uninhabitable for weeks or months.
• Category 5: 157 mph (252 km/h) or higher. Catastrophic damage; a high percentage of framed homes destroyed.

Remember that category is only one number. A slow-moving Category 1 can drop 30 inches of rain and cause historic flooding, while a compact Category 4 may spare a community a direct hit. Always follow local NWS office guidance and evacuation orders.

Hurricane Preparedness: Build Your Plan Before June

Effective hurricane preparedness starts long before a cone appears on the map. The NWS and FEMA recommend a layered approach:

Know Your Risk and Your Zone

Find out whether you live in a hurricane evacuation zone and how your home would fare against storm surge. Surge is the leading cause of death in landfalling tropical systems, and it can push water miles inland over low-lying terrain.

Assemble Supplies and Documents

Store at least seven days of water and non-perishable food, medications, flashlights, batteries, a battery-powered weather radio, and copies of important documents in waterproof containers. Keep your vehicle fueled and have a plan for pets, which are not accepted at every shelter.

Monitor Forecasts From Multiple Sources

Track the official NHC forecast cone, local NWS discussions, and trusted radar and satellite tools. Satellite imagery has improved dramatically in recent years—the GOES-R series now scans storms at higher resolution and frequency than earlier generations, as explained in this overview of GOES-R series real-time weather imagery. For day-to-day monitoring, apps such as Contingencias with hurricane tracking and severe storm alerts combine global radar, GOES-19 satellite views, and a 10-day hourly forecast in one place.

Review Insurance and Evacuation Routes

Check your policy's wind and flood coverage—standard homeowners insurance typically excludes flooding. Map at least two evacuation routes and identify a destination outside the storm's path.

How Technology Helps You Stay Ahead

Modern forecasting gives communities more lead time than ever. The NHC issues advisories every six hours, with intermediate updates when watches and warnings are issued. Radar and satellite data feed models that can project a storm's track days in advance, though the average track error at five days is still around 150–200 miles—which is why the cone widens over time.

Contingencias, developed in Mendoza, Argentina, and available on iOS and Android in more than 40 countries, offers hurricane tracking, severe storm alerts, global earthquake notifications, and agricultural tools like evapotranspiration and soil water balance. It is an independent app and is not affiliated with any government agency, even though it draws on official public data.

Frequently Asked Questions

When does hurricane season start and end?

In the Atlantic basin, the season officially runs from June 1 to November 30. The Eastern Pacific season begins May 15, and the Central Pacific season begins June 1; both end November 30.

What are the hurricane categories based on?

The Saffir-Simpson scale ranks hurricanes from Category 1 to Category 5 by maximum sustained wind speed, starting at 74 mph. It estimates wind damage but does not measure storm surge, rainfall, or tornado risk.

When is the peak of Atlantic hurricane season?

Activity typically peaks from mid-August through late October, with September 10 often cited as the climatological peak. Roughly two-thirds of all Atlantic tropical activity occurs between mid-August and late October.

What should be in a hurricane preparedness kit?

At least seven days of water and food, medications, flashlights, batteries, a weather radio, phone chargers, cash, and copies of important documents in waterproof packaging. Include pet supplies and a plan for evacuation routes.