El Niño 2026: What a Hotter Summer Means for Your Heat Prep

El Niño has returned for summer 2026, and forecasters expect a hotter than normal season across much of the United States, with the strongest heat odds over the Intermountain West. This guide explains what the forecast actually says, why El Niño summers tend to run hot, and exactly how to get ready at home, on the trail, and in your vehicle, including the gear that is safe to store in a hot car and the gear that is not.

Is 2026 an El Niño year, and will summer be hotter?

Yes. As of mid 2026 the tropical Pacific is shifting into El Niño, and forecast models are in strong agreement. The IRI and NOAA model plume put the chance of El Niño at roughly 98 percent for May through July 2026, and El Niño conditions are expected to persist through the rest of the year (IRI / NOAA Climate Prediction Center).

NOAA's Climate Prediction Center seasonal outlook leans hotter than normal across most of the West and the Northeast. The highest odds of above normal temperatures sit over the Intermountain West, where parts of Utah, Colorado, and Nevada show a 50 to 60 percent probability of a hotter than average summer (NOAA Climate Prediction Center). One regional exception is a cooler lean over the Upper Midwest and Great Lakes.

Why El Niño summers tend to run hot

El Niño shifts global weather patterns and is associated with elevated global temperatures. Combined with the longer warming trend, that loads the dice toward more frequent and more intense heat. The practical takeaway is simple: plan for more hot days, longer heat stretches, and a higher chance of heat affecting your commute, your outdoor plans, and your home.

The heat risk people underestimate: your vehicle

A parked car becomes dangerous fast. The interior of a vehicle can climb 40 degrees or more above the outside air temperature, pushing cabins past 130 to 170 degrees Fahrenheit on a hot day (National Weather Service). That is a risk for people and pets, and it is also why a breakdown or a long wait for roadside help in summer is far more serious than most drivers assume. Extreme heat is among the deadliest weather hazards in the country: it is linked to roughly 2,000 deaths in a typical recent year, and more than 2,300 heat-related deaths were recorded in 2023 (CDC).

What is safe to keep in a hot car (and what is not)

This is where most car emergency kits fail. If gear lives in a hot trunk all summer, some of it degrades or becomes unsafe. Split your kit into two parts.

Safe to store in the vehicle year round (heat and freeze tolerant):

• Sealed long shelf-life emergency water pouches (rated for wide temperature swings)
• Reflective windshield shade and an emergency reflective shade tarp or bivy
• A high visibility vest and an LED roadside marker
• A window breaker and seatbelt cutter tool
• Heat tolerant first aid basics
• A durable storage case

Keep with you or in cool storage, not a hot vehicle (heat sensitive):

• Lithium power banks (extreme heat degrades them and, rarely, makes them unsafe)
• Sunscreen (loses effectiveness when it bakes)
• Electrolyte powders and other consumables (degrade and clump)
• Medications (follow the label and your pharmacist's guidance; do not store in a vehicle unless rated for those temperatures)

The rule: many items with a battery, an SPF rating, or temperature-sensitive ingredients should not be stored long term in a hot trunk. A parked cabin gets hot too, so carry these with you or keep them cool. Most heat-stable hardware can stay put.

Your 2026 heat-readiness checklist

In your vehicle: water (shelf-stable), windshield and shade cover, high-vis vest and roadside marker, escape tool, first aid, and a way to charge a phone (a power bank kept with you, not baking in the vehicle).

On the trail or working outside: more water than you think you need (about 1 cup every 15 to 20 minutes when you are active in the heat, roughly a quart per hour, per OSHA and CDC), electrolytes, sun protection, a cooling towel, and a plan to turn back early in extreme heat.

At home for a heat wave or outage: drinking water stored, a battery fan and charged power banks, a plan for kids, pets, and elderly family, and a cool room identified in advance.

Want this as a one page printable? Get the free Heat-Wave Prep Checklist.

Frequently asked questions

Sources

• IRI — ENSO Forecast
• NOAA CPC — ENSO Diagnostic Discussion and NOAA CPC — Seasonal Temperature Outlook
• National Weather Service — Heat and Cars
• CDC — Heat and Health
• Ready.gov — Water and OSHA — Heat (water, rest, shade)