Cities Predicted to Reach 100 Degree Days in April
Accurate long-range weather forecasting is extremely difficult. The National Weather Service’s Climate Prediction Center offers forecasts extending “8 to 14 days,” “one month,” and “three months,” but these cover broad geographic areas and predict only whether temperatures and precipitation will be “above,” “below,” or “near normal” — never specific numbers.
AccuWeather takes a more ambitious approach, publishing month-ahead forecasts by date. However, scientists caution that detailed long-term forecasts have limited reliability. Beyond two weeks, predictions are little better than a coin toss. According to NOAA, a seven-day forecast is accurate about 80% of the time, a five-day forecast about 90% — but a forecast of ten days or more is right only about half the time.
Several major tech companies claim their AI models can outperform traditional forecasting. Nvidia, the world’s largest AI chip maker, markets its Earth-2 platform as a tool that “democratizes global access to professional-grade weather and climate AI.” Google has its own offering through DeepMind WeatherNext 2. A number of niche companies compete in the same space, including Atmo, WindBorne Systems, Salient Predictions, and Meteomatics. Atmo notably serves military clients, claiming its forecasts are “trusted by the United States Air Force, Navy, and the Philippines national government.” That said, no single AI weather company has emerged as a clear consensus leader, which gives some reason for skepticism about the field’s broader claims.
Climate Crisis247 looked at every possible, legitimate long term forecast it could find to provide a list of cities that will have temperatures above 100 degrees F at least once this month. The task is easier because there were so many all time high temperatures in March. The hottest were in the Southwest. We looked at data from Weather Spark, Weather-dot-com, Accuweather,CBC, and additional government data.
Where 100°F Days Are Possible in April
Triple-digit temperatures in April are rare in most of the world — it’s still early spring across the Northern Hemisphere. However, meteorologists at NOAA, AccuWeather, and elsewhere note that 2026 has brought unusually warm conditions, driven by a persistent high-pressure “heat dome” pattern moving across the U.S. and amplified by longer-term climate trends.
The U.S. Southwest remains the most likely region to see temperatures exceeding 100°F in April:
Phoenix, Arizona and surrounding cities (Mesa, Tucson, Yuma)
Phoenix typically sees its first 100°F days in late April or May. (This year, it reached this level in March). AccuWeather and local outlooks assume that because some of the March issues persist, And several models show highs pushing into the low-to-mid 100s during hotter days..
Coachella Valley, California (Palm Springs, Indio)
Daily highs in this region can reach 100°F, with monthly averages around 89°F. Early-season heat is common here.
Death Valley, California
One of the hottest places on Earth, Death Valley routinely surpasses 100°F in April — and often reaches far higher — when high-pressure ridges settle over the region.
Las Vegas, Nevada
Like Phoenix, Las Vegas can approach or exceed 100°F in April during heat waves, and seasonal outlooks favor above-average warmth across the Southwest this year.
These trends are a microcosm of what is happening in the world. According to the World Meteorological Organization writing in 2025, “Global climate predictions show temperatures are expected to continue at or near record levels in the next five years, increasing climate risks and impacts on societies, economies and sustainable development.”
