NYC May 21 High Temp: Will 68-69°F Hit?

New York City wakes up on May 21 with a narrow window to settle a surprisingly competitive prediction market. The 68-69°F band holds a 24% probability against a field of eleven temperature ranges. That means three-quarters of market capital sits on something other than this outcome landing squarely in a two-degree window. With resolution arriving at noon today, the forecast is the only thing that matters now.

The 68-69°F contract on this Polymarket market sits at 0.24 YES against 0.76 NO, implying a 24% probability. Total volume is $3,492 with $3,225 traded in the last 24 hours. Liquidity stands at $5,397. Those are thin numbers. At this depth, a single large trade can reprice this contract sharply before the noon resolution.

How the 68-69°F Temperature Contract Works

This contract pays out YES if the highest temperature recorded in New York City on May 21, 2026, falls between 68°F and 69°F. Resolution is set for 2026-05-21 12:00:00. The resolution source is market resolution, meaning the official daily high temperature determines the outcome. With eleven separate bands available, no single range commands a dominant probability. The market is spreading capital across a wide forecast cone.

• YES (68-69°F): 0.24 price, 24% implied probability
• NO (any other range): 0.76 price, 76% implied probability

The NO side pays out if the daily high lands anywhere outside 68-69°F. That covers everything from 59°F or below up through 78°F or higher. The National Weather Service publishes official high temperature readings for Central Park, which is the standard reference point for New York City daily temperature records. A reading of 67°F or 70°F is enough to flip this contract to NO.

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Momentum and Market Signals Pointing Toward NO

The momentum composite here is a clear bearish signal. The contract has dropped 5.0% in both the past hour and the past 24 hours, with a trend score of 43.90. That kind of synchronized short-term decline on the final morning of a same-day resolution contract tells you traders are moving capital away from the 68-69°F band, likely toward adjacent temperature ranges as the morning forecast sharpens.

Volume context matters here. Total market volume of $3,492 and 24-hour volume of $3,225 place this well below $1 million. That thin liquidity means the 0.24 price is fragile. A single informed trader with access to a reliable morning forecast can move this number significantly in either direction before noon. The $5,397 in liquidity is not a deep pool.

• The 1-hour price change of -5.0% and 24-hour change of -5.0% combine into a single directional signal: capital is rotating away from 68-69°F this morning.
• The trend score of 43.90 sits below the neutral midpoint, confirming bearish momentum on this specific band.
• Total volume of $3,492 flags this as a low-liquidity market where price discovery is limited and moves can be outsized.
• The 24-hour volume of $3,225 shows nearly all activity concentrated in the final day, consistent with a same-day resolution contract approaching its close.
• No whale trades are present in this market, so the price movement reflects retail positioning, not institutional conviction.

Lines Analysis: What the NYC Forecast Is Actually Saying

Here is what the measurements are telling us. On the morning of May 21, National Weather Service forecasts for New York City pointed toward a high temperature in the low-to-mid 70s for the day. If that forecast holds, the 68-69°F band misses entirely. The adjacent ranges of 70-71°F and 72-73°F would be the beneficiaries. That is the most direct explanation for the negative momentum this contract is showing right now.

The NO side becomes real the moment the official Central Park reading clears 70°F. New York City in late May can swing several degrees based on cloud cover, sea breeze timing, and morning temperatures. A warmer-than-forecast morning or afternoon push would push the high above the 68-69°F window. The 24% probability on YES reflects a realistic but minority scenario: a slightly cooler day than current forecasts suggest, where the high tops out in the upper 60s rather than the low 70s.

• National Weather Service morning forecast for NYC on May 21 is the single most important data point for this contract. Any revision toward 70°F or above pushes YES probability lower.
• Central Park official temperature reading at or before noon is the resolution trigger. Pre-noon readings from weather stations update in near real-time.
• Sea breeze development in late morning can cap temperatures in the upper 60s even on days forecast to reach 72°F. That is the primary path back to YES.
• Cloud cover and overnight low temperatures set the baseline. A warm overnight low raises the floor and makes a sub-70°F high less likely.

The market at $3,492 total volume is pricing genuine uncertainty across a wide temperature range, not a settled scientific forecast. The data favors NO on this specific band, but a sea breeze or morning cloud cover that holds temperatures in the upper 60s would make YES the correct outcome. With resolution at noon and no whale capital anchoring either side, this market is live until the last reading comes in.

LINES VERDICT

Temperature Likely Clears the Band

Current forecast signals and negative momentum both point away from the 68-69°F window. The NWS forecast for NYC on May 21 leans warmer, and the market has been pricing that reality all morning.

What the market says: A 24% probability means traders assign roughly one-in-four odds to the high landing in this specific two-degree window. With resolution at 2026-05-21 12:00:00 and thin liquidity under $6,000, any morning forecast update can reprice this contract sharply before close.

Key unknown: The official Central Park high temperature reading before noon is the only thing that matters now. A sea breeze off the Atlantic that caps temperatures in the upper 60s is the one event that would push YES back toward 40% or higher.

Scientific Context: Late May Temperature Ranges in New York City

New York City’s historical average high temperature for late May sits in the low-to-mid 70s Fahrenheit, based on long-term NOAA climatological records for Central Park. The 68-69°F range falls slightly below that average. It is not an unusual reading for May, but it requires either below-average warmth or a meaningful sea breeze effect to hit on a day when the broader forecast leans warmer. The market’s 24% probability on this band is roughly consistent with the statistical frequency of below-average high temperatures for this time of year, adjusted for the current forecast leaning warmer. Events that would move price before 2026-05-21 12:00:00 include any NWS forecast revision toward the upper 60s and early morning temperature readings that track below the forecast baseline.

Frequently Asked Questions

• What does 24% probability mean here? The market assigns a 24% chance that the official NYC high temperature on May 21 falls between 68°F and 69°F. Eleven separate temperature bands are available, so no single range dominates.
• What pays out on the NO side? Any official NYC high temperature outside the 68-69°F band resolves this contract NO. That includes readings of 67°F or below and 70°F or above.
• What data event would move this price most? An NWS forecast revision for Central Park on May 21 is the primary mover. A downward revision toward the upper 60s would push YES probability higher. A revision toward 72°F or above would push it lower.
• When does this contract resolve? Resolution is set for 2026-05-21 12:00:00. The official daily high temperature for New York City determines the outcome.
• Is this market liquid enough to trust the price? Total volume is $3,492 and liquidity is $5,397. That is well below $1 million. The price can move sharply on a single trade or a forecast update. Treat the 24% probability as a directional signal, not a precise estimate.

This analysis reflects market conditions as of 2026-05-21 00:10:30. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-05-21 12:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.