Highest temperature in Istanbul on July 4?

Platform comparison

Market context

On 4 July 2026, Istanbul will experience its peak daytime heat, with NOAA expected to record the highest temperature at Istanbul Airport. The current crowd-implied probability for a "YES" outcome in this prediction market sits at 0%, reflecting a consensus that the temperature will not exceed the threshold being wagered on. Instead, ensemble forecasts from global models suggest the maximum will likely settle near 25–27°C, driven by northerly flow and stable atmospheric conditions[1].

Historical data frames this low probability as rational: July in Istanbul typically sees daily highs between 82°F and 85°F (28–29°C), rarely dropping below 75°F or exceeding 90°F[2]. While Turkey recently recorded an all-time heat record of 50.5°C in Şırnak, major cities like Istanbul only briefly surpassed 40°C during that July heatwave, indicating significant regional variability[7][8]. The average high for July in Istanbul is around 30°C, yet the prevailing northerly winds this year are suppressing extremes, aligning with the market’s 97% confidence in a 26°C outcome[1][4].

Traders should monitor real-time updates from NOAA’s time-series data for Istanbul Airport (site LTFM), as the market resolves only once the first data point for 4 July is published[1]. Key catalysts include shifts in Aegean wind patterns, which drive day-to-day variability in maximum temperatures, and any sudden changes in northerly flow that could alter the forecasted 25–27°C range[6]. With USDC settled on Polygon via conditional tokens, on-chain mechanics ensure transparent resolution once NOAA releases the official "Temp" column reading for the day[1]. Recent forecasts from AccuWeather confirm daily highs ranging from 78° to 87°F, reinforcing the likelihood of a moderate peak rather than an extreme spike[5].

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Legit?. 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.

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.

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.