NYC June 18 Low Temp: Will 68-69°F Hold?

New York City’s overnight low temperature for June 18 has become one of the most actively traded short-duration weather markets on Polymarket this week. The 68-69°F band has pulled ahead sharply, climbing from a 22-cent opening price to 57 cents in under 24 hours. That move reflects a rapid convergence in trader conviction as forecast models tighten around a specific temperature range less than 24 hours before resolution.

The market question asks which two-degree band contains NYC’s lowest temperature on June 18. The 68-69°F outcome trades at 57 cents (57% implied probability). The next closest band, 66-67°F, represents the primary alternative. The market resolves at 12:00 UTC on June 18, 2026, with $15,185 in total volume and $14,146 of that arriving in the last 24 hours alone.

How the NYC June 18 Temperature Contract Works

This contract resolves YES for the 68-69°F band if the official lowest temperature recorded in New York City on June 18 falls between 68 and 69 degrees Fahrenheit inclusive. The outcome is determined by the market resolution source using official temperature data. All other two-degree bands resolve NO. With eleven possible bands spanning from 59°F or below to 78°F or higher, only one outcome pays out at $1.00.

• 68-69°F trades at $0.57, implying a 57% probability the overnight low lands in this band.
• 66-67°F is the next most likely alternative, reflecting the possibility of a slightly cooler overnight than current forecasts suggest.
• 70-71°F captures upside risk if the city retains more heat than expected into the early morning hours.

The NO outcome for the 68-69°F band pays out if the lowest temperature recorded falls in any other range. That happens most plausibly if a marine layer or a late-arriving cold front pulls the overnight low into the 66-67°F range, or if unusually persistent warmth holds the low at 70°F or above. NYC’s overnight lows in mid-June typically cluster between 65 and 72°F, so the leading band sits comfortably within historical norms. Departure requires a measurable weather system, not just model noise.

Sponsored Partner

Market Momentum and Conviction Signals

The momentum composite here is unusually clear for a sub-$20,000 market. The 24-hour price change of plus 6.5% combined with a trend score of 48.35 and a flat one-hour reading points to a market that made its big move yesterday and is now holding. The driver was almost certainly the latest National Weather Service forecast model run on June 17, which tightened the overnight low estimate into the upper 60s. When forecast models converge, short-duration weather markets follow fast.

Total volume sits at $15,185, with $14,146 arriving in the last 24 hours. Liquidity is $20,155, which is healthy relative to volume for a market this close to resolution. Because total volume is below $1 million, this market is thin by prediction market standards. A single large order could still move the price meaningfully in either direction before the 12:00 UTC close.

Key Factors

• The 24-hour price gain of 6.5% reflects a sharp forecast convergence on June 17, pushing the 68-69°F band from long-shot to frontrunner in hours.
• The one-hour price change of 0.0% signals the market has stabilized after the June 17 volatility, suggesting traders are satisfied with current pricing.
• Thin volume below $1 million means the 57-cent price is sensitive to any late forecast update or breaking weather observation from Central Park.
• The 66-67°F band remains the most credible alternative, capturing the probability that overnight cooling outpaces current model guidance.
• Resolution closes at 12:00 UTC on June 18, giving overnight temperature readings roughly six to eight hours to finalize before the market settles.

Lines Analysis: What the Data Is Telling Us About NYC’s Overnight Low

Here’s what the measurements are telling us. The National Weather Service forecast for New York City on June 18 places the overnight low in the upper 60s, consistent with a warm but not exceptional early-summer night. Sea surface temperatures along the Northeast corridor remain above historical averages for June, which tends to keep overnight lows elevated in coastal urban areas like Manhattan. The urban heat island effect adds another one to three degrees Fahrenheit over surrounding rural readings, pushing the probability mass toward the warmer end of the distribution.

The path to a result outside the 68-69°F band runs through atmospheric dynamics the models may not yet fully capture. A faster-than-expected progression of drier air from the northwest could drop the overnight low into the 66-67°F range. Conversely, persistent southerly flow off the Atlantic could hold the low at 70°F or above. Neither scenario requires an unusual weather event, but both require the current model consensus to be meaningfully wrong. The data doesn’t care about the politics of which band traders prefer: the atmosphere will do what the atmosphere does.

Signals to Monitor

• The 18:00 UTC National Weather Service model run on June 17 is the last major forecast update before resolution. Any shift in predicted overnight low will reprice this market immediately.
• Central Park hourly temperature readings after midnight on June 18 serve as the real-time signal. Sustained readings above 70°F or below 67°F would pressure the leading band’s probability sharply.
• Wind direction at JFK and LaGuardia after 02:00 local time matters. Southerly winds hold warmth. Northwest flow accelerates cooling.
• Dew point readings above 65°F in the overnight hours tend to suppress radiative cooling, keeping the low elevated and favoring the 68-69°F or 70-71°F bands.
• Any late-breaking convection or shower activity in the metro area before dawn could disrupt temperature trends in either direction.

The market is pricing uncertainty, not science. With $15,185 in total volume, the 57-cent price reflects a reasonable but not overwhelming consensus. The data currently favors the 68-69°F band based on forecast model alignment. The six-cent spread between YES and NO means there is still meaningful disagreement about whether the overnight low lands precisely in this two-degree window rather than one band lower or higher.

LINES VERDICT

Narrow Forecast, Narrow Edge

The National Weather Service guidance and urban heat island dynamics both point toward an overnight low in the upper 60s for NYC on June 18, giving the 68-69°F band a genuine but modest edge over its neighbors.

What the market says: At 57% implied probability, the market has a clear leader but not a settled outcome. With resolution in less than 24 hours and thin total volume, any significant forecast revision before midnight could swing the price sharply in either direction.

Key unknown: The final National Weather Service model runs on the evening of June 17 and the actual overnight wind direction and dew point readings in Manhattan are the single most important data signals before this market closes.