Summer 2026 Weather Outlook: Three Signals Pointing Toward a Hot One

Signal 1: El Niño Is Building — Possibly a “Super” Event

La Niña collapsed faster than expected this spring. Subsurface temperatures in the tropical Pacific are surging, and NOAA now puts the probability of El Niño emerging by June–August at 62%. That alone would shift summer weather patterns. But some forecast models are projecting something bigger.

What does El Niño actually do to US summers? The effects are less dramatic than its winter impacts, but they're real. The southern US tends to see more rainfall (potentially easing drought in parts of Texas and the Gulf Coast), while the northern US and Pacific Northwest often get drier and warmer. The biggest summer impact: El Niño suppresses Atlantic hurricane activity by increasing wind shear. That's a potential silver lining for coastal cities from Houston to Miami.

Signal 2: March Already Broke Summer Records

Spring barely started before records fell. In the last week of March 2026, a heat dome parked over the Southwest and expanded into the Plains, producing what may have been the most expansive March heat wave in American history. More than 150 daily records and about 50 monthly records broke between Tuesday and Saturday of that single week.

The numbers are jarring: Yuma, Arizona hit 109°F — a new national March record, beating a mark set in 1954 and 1902. Four locations in Arizona and California reached 112°F, smashing the national record for hottest March day by 4 full degrees. Phoenix tied its all-time April high of 105°F — in March. Some stations didn't just break their March records; they broke their April and May records too.

14 States Set All-Time March Records

World Weather Attribution released a rapid study concluding this heat wave was “virtually impossible” without human-caused climate change. That's notable because attribution studies are usually hedged. This one wasn't.

So what does a historically hot March mean for summer? It doesn't guarantee a hot summer — weather isn't that simple. But it tells us the atmospheric setup (persistent ridging, dry soils amplifying heat) is already locked in across the West. And dry soil going into summer is one of the strongest predictors of extreme heat events, because there's no soil moisture to provide evaporative cooling.

Signal 3: Drought Is Priming the Pump

Over 56% of the contiguous US is currently in at least moderate drought — the largest extent in more than three years. This matters for summer heat more than most people realize.

Here's the mechanism: when soil is dry, incoming solar energy heats the ground and air directly instead of being used to evaporate moisture. It's the difference between putting a wet towel and a dry towel on a hot dashboard — the dry one gets scorching fast. The western mountain snowpack sitting at 25-50% of normal means less meltwater flowing into reservoirs and fields this summer. Less moisture, more heat, more wildfire risk. The record-dry winter set this up.

The Honest Answer About Winter-to-Summer Correlation

I want to address this directly because it's the obvious question: “We had a record warm winter, so does that mean summer will be brutal?”

Historically? It's basically a coin flip. Research from WKU Meteorology analyzing decades of US temperature data found that the hottest summers had about a 50% chance of being followed by above-average winters. The seasons are largely independent weather-wise — different jet stream patterns, different ocean conditions, different drivers.

City by City: Where Summers Are Trending Hottest

A Climate Central analysis of 242 major US cities found that 97% have warmer summers now than they did in the 1970s, with an average warming of 2.6°F. That might sound small, but for a three-month average, it's enormous. Here are the cities where I'd be most concerned heading into summer.

Warming rates computed from NOAA GHCN-Daily summer observations (June–August), 1970–2025.

What to Watch: May Through August

Seasonal outlooks aren't prophecies. They're probabilities. Here's what I'll be tracking as summer approaches, and what would change the picture.

Data Sources & Methodology

This analysis draws on multiple sources: the NOAA Climate Prediction Center seasonal outlook, the NOAA NCEI Winter 2025-26 Climate Report, city-level warming trends from 55 years of NOAA GHCN-Daily observations, and the World Weather Attribution rapid study on the March 2026 heat wave. El Niño probabilities from the CPC ENSO diagnostic discussion. Summer warming trends from Climate Central. “Summer” refers to meteorological summer: June, July, and August. This article presents historical analysis and current forecasts — it is not a weather prediction.

Explore Historical Summer Weather by City

Look up 55+ years of summer temperature data for any of our 327 US cities. See how summers have changed over time and what this year's forecast means for your area.