Highest temperature in Istanbul on July 4?

Platform comparison

Market context

On 4 July 2026, the real-world event determining this market’s outcome is the highest temperature recorded by NOAA at Istanbul Airport, measured in degrees Celsius. In prediction markets, a YES share means you believe the specific outcome will occur, while a NO share means you believe it will not. Here, the crowd currently assigns a 0% chance to the YES outcome, implying traders are virtually certain the temperature will not fall into the range implied by the YES bet. This market resolves only once the first data point for that date is published by NOAA, with the settlement window closing at 12:00 UTC on 4 July 2026.

Historical July weather in Istanbul typically sees daily highs between 25°C and 30°C, rarely dipping below 24°C or exceeding 33°C in an average year[2][5]. Recent ensemble forecasts from global models suggest Istanbul’s maximum on 4 July will likely settle near 25–27°C, driven by northerly flow[1]. A separate market on Polymarket shows 97% confidence in exactly 26°C, while another platform lists 41% for 25°C, indicating strong consensus around this range[1][3]. The 0% YES probability here likely reflects a mismatch between the implied range and these well-supported forecasts.

Traders should monitor NOAA’s daily time-series updates for Istanbul Airport (site LTFM), as the resolution depends entirely on the highest “Temp” reading published for that day. Any shift in regional wind patterns or sudden heatwave activity could alter the outcome, though July in Istanbul is generally stable with constant solar energy around 7.7 kWh[2]. While Turkey recently recorded an all-time high of 50.5°C in Şırnak, that extreme occurred in the southeast and did not significantly impact Istanbul’s typical summer profile[6][7]. Watch for any official heatwave announcements from Turkish meteorological services, as these could signal deviations from the norm.

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 Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Market UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.