NYC Hit 86-87°F on July 9, 2026 | Lines.com

New York City’s LaGuardia Airport Station recorded a daily high of 86 to 87 degrees Fahrenheit on July 9, 2026. The Polymarket temperature range market for that date resolved to the 86-87°F band, confirmed via Weather Underground data from LaGuardia. The result settled exactly at the historical July average high for New York City.

The 86-87°F outcome entered the day priced at roughly 34 percent. By resolution, traders had driven that probability to 100 percent as real-time readings from LaGuardia locked in the range. The market opened with genuine spread across the mid-80s bands, but the day’s data collapsed that uncertainty fast. Total volume reached $148,914, with $122,329 of that trading in the final 24 hours.

LaGuardia Records 86-87°F on July 9, Confirming Market Outcome

LaGuardia Airport Station is the official resolution source for this market, with readings verified through Weather Underground. The July 9 high landed squarely in the 86-87°F band, the fifth bracket in a range that spanned from 75°F or below up to 94°F or higher. The reading placed the city’s peak temperature right at the climatological July average of 86°F for New York City, a sharp moderation from the brutal heat that gripped the region just days earlier.

Context matters here. LaGuardia set a station record for the highest midnight temperature ever measured, hitting 94°F around midnight heading into July 4, 2026, as an intense heat wave swept the northeastern United States. July 9 delivered a very different story. The 86-87°F reading represented a return toward seasonal norms after that extraordinary early-July spike. The market’s final hours reflected that trajectory clearly, with the 86-87°F band absorbing nearly all remaining probability as the temperature trace emerged.

At market close on July 9, the probability for the 86-87°F outcome sat at 100 percent. The convergence happened quickly on the day itself. The 24-hour price change registered at plus 60.5 percent, and the intraday move on July 9 was plus 53.5 percent. That is not a gradual drift. Traders read the incoming temperature data and moved decisively into the correct band.

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How the Market Performed on a Multi-Band Temperature Question

This market structure is more granular than a simple YES/NO binary. Traders had to pick the correct 2-degree Fahrenheit band from 11 possible outcomes. The 86-87°F band opened the day at approximately 34 percent implied probability. That means the market collectively assigned better than 2-to-1 odds against this specific band at the start of the day. The outcome resolved YES, making the 34 percent opening price an underpricing of the eventual winner. The market was pricing genuine uncertainty across several mid-80s bands, not a clear consensus on 86-87°F specifically.

Total volume of $148,914 against $193,414 in liquidity signals a well-funded market with meaningful price discovery. The concentration of $122,329 in 24-hour volume confirms that traders engaged most actively on the day of resolution, when real-time temperature data from LaGuardia was directly observable. Liquidity exceeded volume, which typically reflects active market-making rather than one-sided conviction.

MARKET PERFORMANCE SUMMARY

• Resolution Outcome: 86-87°F confirmed at LaGuardia Airport Station on July 9, 2026.
• Article-Time Probability (implied): 100 percent at resolution.
• Opening-Day Probability: approximately 34 percent for the 86-87°F band.
• Total Volume: $148,914.
• Market Assessment: Underpriced YES. The correct band opened at 34 percent in a multi-band market. Probability surged to 100 percent as real-time LaGuardia data confirmed the range on July 9.

What the July 9 Reading Means for NYC’s Summer Temperature Picture

The 86-87°F reading on July 9 matters in a specific context. LaGuardia recorded a station-record midnight temperature of 94°F on July 4, signaling an exceptionally hot early-July period for the Northeast. The moderation to the seasonal average by July 9 suggests the extreme heat event had dissipated, but 86-87°F still represents a warm summer day in New York City, consistent with the city’s documented warming trend over recent decades. The July average high of 86°F is itself a figure that has shifted upward as urban heat and broader climate signals compound.

For prediction markets tracking temperature bands in specific cities, this resolution illustrates the structural challenge of multi-bucket markets. When 11 bands divide the plausible outcome space, accurate calibration requires granular NWS and model data, and even well-informed traders can distribute probability across adjacent bands. The 24-hour surge from 34 percent to 100 percent reflects the power of real-time observational data to collapse that distributional uncertainty on the day itself. Markets that resolve against measured physical data tend to resolve fast and clean once the readings arrive.

• LaGuardia Airport Station will remain the resolution benchmark for future Polymarket NYC temperature markets, and its recent record-setting readings give historical context for how extreme 2026 heat events compare to prior summers.
• The early July 2026 heat wave, which produced a 94°F midnight reading at LaGuardia on July 4, raises the baseline traders should use when pricing early-to-mid July NYC temperature bands in future market cycles.
• The 86-87°F July 9 outcome aligns with the city’s historical July average, suggesting that after extreme heat events, mean reversion to seasonal norms can happen within days and markets should weight post-wave moderation scenarios accordingly.
• Multi-band temperature markets with 2-degree resolution require tighter pre-day NWS model alignment to avoid flat probability distribution across adjacent bands, a structural lesson this market demonstrates clearly.

LINES RESOLUTION VERDICT

CONFIRMED: 86-87°F at LaGuardia, July 9, 2026

The data landed exactly where July climatology said it should, right after one of the most extreme early-July heat events LaGuardia has ever recorded, and the market caught up only when the readings were live.

What the market showed: The 86-87°F band opened July 9 at approximately 34 percent implied probability against 11 possible outcome bands, making this an underpriced YES in a market where real-time observational data from LaGuardia drove a 60.5 percent single-day price surge to resolution at 100 percent.

This analysis reflects the confirmed resolution of this market as of July 9, 2026. Prediction market probabilities reflect collective trader conviction, not guaranteed outcomes. Lines.com does not accept bets or provide financial or gambling advice.