NOAA: May 2026 recorded as the world’s second-warmest May on record

The National Oceanic and Atmospheric Administration (NOAA) lists May 2026 as the world's second-warmest May since records began. Only May 2024 was higher. The global surface temperature for the month stood 1.07 °C (1.93 °F) above the 20th‑century average, extending a run of unusually warm months.

Temperature anomaly and context

The reported deviation refers to the 20th‑century average and denotes an anomaly, not an absolute warming relative to pre‑industrial conditions. Monthly values indicate how current conditions differ from earlier norms. For assessing long‑term targets—such as international temperature limits—annual and decadal averages and comparisons with pre‑industrial references are the most relevant measures.

Precipitation: regional differences

Alongside temperatures, NOAA notes pronounced regional differences in precipitation. Some areas experienced significantly wetter conditions, while others faced persistent dryness. These contrasts reflect the complex coupling between the atmosphere, oceans and regional weather systems, and they raise local risks for flooding or drought.

Trend and variability

Short‑term fluctuations arise in part from atmospheric circulation patterns and oceanic cycles. The long‑term warming trend is driven primarily by increased greenhouse gas concentrations. Monthly reports like that for May 2026 illustrate how natural variability can temporarily amplify or dampen this baseline trend.

Impacts

Higher monthly averages increase the risk of heat stress, crop losses and infrastructure problems. A warmer atmosphere intensifies the global water cycle: heavy precipitation events become more likely in some regions, while others are more prone to drought. This raises adaptation demands for planning, health services and water management.

Outlook

Ongoing NOAA monitoring provides evidence for research, policy and practice—from heat and heavy‑rain warnings to regional preparedness planning. The observed trend toward more frequent warm months underlines the need to reduce emissions and further expand adaptation measures.

Source: NOAA NCEI