May 2026 Temperature Anomaly: Will It Land at 1.10–1.14ºC?

The global temperature anomaly for May 2026 is shaping up as one of the tighter calls of the year. The contract asks whether the monthly anomaly lands in a specific 0.05ºC band: 1.10 to 1.14ºC above the pre-industrial baseline. At 58% implied probability, traders are leaning yes, but nearly four in ten are betting the reading lands somewhere else. That gap is where the interesting questions live.

The 1h and 24h momentum composite tells a clear story. The contract moved up 17.5% across both windows, with a trend score of 56.82. That kind of synchronized short-term surge usually traces back to a fresh data signal, and the timing aligns with mid-month preliminary temperature estimates circulating from NOAA and the Copernicus Climate Change Service. Neither agency has published a final May figure yet, but early indicators are pointing toward anomalies in the 1.10–1.15ºC range relative to the 1850–1900 pre-industrial baseline.

How the 1.10–1.14ºC Contract Works

This market resolves YES if the officially reported global mean surface temperature anomaly for May 2026 falls between 1.10ºC and 1.14ºC inclusive. The resolution source is Polymarket’s standard market resolution process, which will reference the published anomaly figure from the relevant climate monitoring body. The contract closes June 10, 2026, giving time for the official May dataset to be finalized and published.

• YES (1.10–1.14ºC): 0.58 price, 58% implied probability. Pays out if the anomaly lands in this specific band.
• NO (any other outcome): 0.42 price, 42% implied probability. Pays out if the anomaly is below 1.10ºC, or 1.15ºC and above.

The NO side covers a wide range of outcomes. The anomaly could fall short of 1.10ºC if La Nina-like cooling patterns suppress the monthly reading. Alternatively, persistent warmth could push the figure above 1.14ºC into the 1.15–1.19ºC band, which is the next most actively traded alternative outcome. The NO contract wins whenever the measurement misses the narrow 0.05ºC target window in either direction. With five alternative outcome brackets available, the probability of at least one of them resolving is statistically meaningful.

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Momentum and Market Signals

The 17.5% price surge across both the 1h and 24h windows, combined with the 56.82 trend score, reflects a single coherent signal: traders are revising their estimates toward the 1.10–1.14ºC band based on emerging mid-month temperature data. Copernicus reported that April 2026 came in as one of the warmest Aprils on record, and early May satellite and surface station data suggest the anomaly is running warm but not dramatically above the 1.10–1.14ºC range.

Total market volume stands at $54,751, with $7,211 traded in the last 24 hours and $29,497 in current liquidity. This is a thin market. Volume well below $1 million means a single large trade can shift the price sharply. The 58% probability reflects genuine uncertainty, but it also reflects the fact that not many dollars are anchoring this price. Any new official data release before June 10 could reprice the contract quickly.

• 1h and 24h change: Both at +17.5%, the strongest combined signal this contract has shown, pointing to a data-driven repricing event.
• Trend score at 56.82: Above the midpoint, consistent with moderate bullish momentum rather than speculative froth.
• 24h volume at $7,211: Low absolute volume means price discovery is incomplete. New information moves this contract more than most.
• Liquidity at $29,497: Thin order book depth. A $5,000 trade could noticeably shift the implied probability.
• Alternative outcomes active: The 1.15–1.19ºC bracket is the main competing resolution path, drawing meaningful trader attention.

Lines Analysis: Reading the Temperature Band

Here’s what the measurements are telling us. Early May 2026 temperature data from Copernicus and NOAA is tracking in a range consistent with the 1.10–1.14ºC band. The post-El Nino transition that characterized late 2025 and early 2026 has moderated the extreme warmth of 2023 and 2024, but global temperatures remain elevated. April 2026 anomalies were in the 1.12–1.15ºC range depending on the dataset, and May is following a similar trajectory based on available preliminary figures.

The threat to YES is a late-month warm surge. May temperatures in the Northern Hemisphere are heavily influenced by sea surface temperatures in the North Atlantic and Pacific. If SST anomalies spike in the final two weeks of May, the anomaly could push above 1.14ºC into the next bracket. The 1.15–1.19ºC outcome currently trades as the most likely alternative, which tells you where traders think the upside risk sits. A cooling anomaly that pushes the reading below 1.10ºC is possible but less consistent with current surface and satellite data.

• Copernicus May preliminary data: Any release in the next two weeks showing anomalies above 1.14ºC would directly reprice this contract downward.
• NOAA monthly global temperature report: The official May figure, expected in early June, is the primary resolution input. Watch for the release date.
• Sea surface temperature trends: Persistent North Atlantic warming is the main upside risk to the 1.14ºC ceiling.
• La Nina status: A strengthening La Nina signal would push the anomaly lower, improving the chances of a sub-1.10ºC outcome.
• The 2026 hottest year ranking market at 58%: A correlated market. If traders there are pricing elevated year-round warmth, the May anomaly landing in the lower band is less likely.

The data doesn’t care about the politics. Based on current measurements, the 1.10–1.14ºC band is the most probable single outcome, and the 58% probability on $54,751 in total volume reflects that. The market is pricing uncertainty, not science. The scientific signal favors YES, but the narrow band and thin liquidity mean this contract stays live until the NOAA and Copernicus figures are published.

LINES VERDICT

Narrow Band, Real Risk

Early temperature data supports the 1.10–1.14ºC band as the most likely single outcome for May 2026, and the momentum composite confirms traders are moving in that direction. The risk is the band’s width: 0.05ºC is a small target when monthly anomaly uncertainty spans several tenths of a degree.

What the market says: At 58%, traders give this band a slight majority but acknowledge meaningful probability of a miss, either above 1.14ºC or below 1.10ºC. Thin liquidity before the June 10, 2026 resolution date means the price can swing sharply on any new official data release.

Key unknown: The NOAA and Copernicus official May 2026 global temperature anomaly publications, expected in late May or early June, are the single most important data releases. Either figure landing above 1.14ºC would immediately reprice this contract lower.

Scientific Context

The global mean surface temperature anomaly has exceeded 1.10ºC in most months since late 2023, driven by a combination of El Nino forcing and background warming trends. The transition to neutral or La Nina conditions in 2025 and 2026 has reduced the extreme peaks seen in 2023 and 2024, but anomalies remain consistently above 1.0ºC across major datasets including HadCRUT, GISTEMP, and the Copernicus ERA5 reanalysis. The 1.10–1.14ºC band sits in the middle of where post-El Nino monthly anomalies have been clustering. That historical pattern is what the 58% probability is largely reflecting. The remaining uncertainty before June 10, 2026 comes from late-month SST behavior and the specific dataset used for resolution.

Frequently Asked Questions

• What does 58% probability mean here? NOAA and Copernicus data, combined with current trader positions, suggests the 1.10–1.14ºC band is the most likely single outcome, but 42% of the market probability sits with alternative outcomes including higher or lower readings.
• How does the NO contract win? The NO position pays out if the official May 2026 global temperature anomaly falls anywhere outside the 1.10–1.14ºC range, including below 1.10ºC or above 1.14ºC across five alternative brackets.
• What data release would move this price most? The Copernicus ERA5 monthly global temperature bulletin for May 2026, expected in early June, is the most market-moving scheduled release before resolution on June 10, 2026.
• When does this contract resolve? The market closes June 10, 2026, after the official May 2026 anomaly figure is published by the relevant climate monitoring agency and confirmed by Polymarket’s resolution process.
• Is the $54,751 volume reliable for price discovery? Total volume below $1 million indicates thin liquidity. The $29,497 order book means a single mid-sized trade could shift the implied probability by several percentage points, so treat the 58% figure as directionally informative rather than precisely calibrated.

This analysis reflects market conditions as of 2026-05-16 06:23:38. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-06-10 00:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.