As summer unofficially kicked off with Memorial Day, many Americans are noticing that 2026 offers an unusually long summer season. This year, Memorial Day fell on May 25, the earliest possible date for the holiday, due to May starting on a Friday. Meanwhile, Labor Day, which marks the traditional end of summer, will not arrive until September 7, the latest possible date for the holiday. This unique alignment results in a summer that spans 106 days, a significant increase from the typical 99 days experienced last year.

Impact of the Extended Summer

The extended summer comes at a time when a strong El Niño is forecasted to begin, potentially bringing a variety of climate impacts across the United States. Many regions are already experiencing higher-than-normal temperatures, with significant heat waves expected throughout the season. Last week, the eastern U.S. faced early-season heat, leading to some schoolchildren being sent home due to inadequate air conditioning in schools. Philadelphia, for instance, shifted to remote learning for students at 57 schools, highlighting ongoing challenges in adapting to rising temperatures.

Historical Context and Future Occurrences

This calendar quirk is not a frequent occurrence. The last time Memorial Day fell on May 25 was in 2020 and 2015. The cycle that allows for this extended summer will not happen again until 2037, followed by intervals of five and six years, and then 11 years. This pattern underscores the rarity of such an extended summer season.

Original reporting: WQAD (Quad Cities) — read the source article.