Highest temperature in Istanbul on July 4?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded at Istanbul Airport on 4 July 2026, measured in degrees Celsius by NOAA. Today, Polymarket prices the YES outcome for this specific temperature range at 0%, reflecting a market consensus that the event is virtually impossible under current conditions. This on-chain contract, settled in USDC on the Polygon network using conditional tokens, treats the abstract probability as zero despite the physical reality of Istanbul’s summer climate.

Historical data frames this 0% probability as an outlier when compared to typical July conditions. Long-term averages show Istanbul daytime maximums reaching 27°C with low humidity, while the broader Turkish region often exceeds 30°C in July, the driest month nationally [1][2]. Even if a heatwave occurs, as seen in late June 2026 when high temperatures gripped the city [9], a 0% market price contradicts the historical likelihood of temperatures hitting at least 25°C. The recent shift in similar markets, where prices rose 12.5% after a forecast update, suggests volatility that the current 0% pricing fails to capture [3].

Traders should monitor NOAA’s daily time-series updates for LTFM (Istanbul Airport) and any official heatwave announcements from Turkish meteorological services. The settlement depends entirely on the first data point published for 4 July 2026, making the timing of NOAA’s release a critical dependency. Recent coverage of high temperatures during the June heatwave [9] indicates that extreme weather events are plausible, and any sudden forecast shift could invalidate the current 0% consensus. The market’s resolution hinges on the "Temp" column maximum, so real-time metric unit checks are essential for accurate on-chain positioning.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Istanbul on July 4? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 PolyGram. 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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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.