Highest temperature in Istanbul on July 4?

Platform comparison

Market context

The real-world event driving this market is the NOAA-recorded peak temperature at Istanbul Airport on 4 July 2026, measured in degrees Celsius under the "Temp" column. A programmatically savvy trader would approach this by querying the NOAA timeseries endpoint for LTFM, filtering for the maximum value on that specific date, and converting units via the metric toggle if necessary. The current crowd-implied probability of 0% for any outcome below 25°C reflects a consensus that extreme coolness is virtually impossible, aligning with ensemble forecasts suggesting a likely settlement near 25–27°C driven by northerly flow[1].

Historical data frames this probability as highly rational: Istanbul’s July 4 mean maximum traditionally runs between 27°C and 29°C based on long-term normals, rarely dipping below 25°C or exceeding 32°C[3]. Even during the record-breaking July 2025, which saw Turkey hit 50.5°C nationally, Istanbul’s airport temperatures remained within the typical summer band, reinforcing that sub-25°C outcomes are statistically negligible[4]. A trader evaluating tooling should note that average daily solar energy in July remains essentially constant at 7.7 kWh, providing a stable thermal baseline that further diminishes the likelihood of anomalous cooling[2].

The primary catalysts to monitor are the official NOAA data release schedule and any sudden shifts in regional wind patterns, as northerly flows currently dominate the forecast[1]. Traders using conditional orders should set alerts for the publication of the first data point for 4 July, as the market cannot resolve until this is published[1]. Recent reports confirm Türkiye experienced its hottest July in 55 years, with average temperatures reaching 26.9°C, suggesting that any deviation below 25°C would require an unprecedented meteorological anomaly[9]. For copy-trading bots, the dependency on NOAA’s specific "Temp" column means automated scripts must strictly adhere to the source’s metric conversion protocol to avoid unit errors.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Istanbul on July 4? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Bot UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.