Highest temperature in Helsinki on July 13?

Platform comparison

Market context

Helsinki's peak temperature on 13 July 2026 will be recorded at Vantaa Airport and settled against historical data from Weather Underground. The current crowd-implied probability of 0% suggests traders are either awaiting resolution or treating the market as inactive pending closer approach to the settlement date. Cross-platform comparison shows minimal liquidity across major prediction markets, with no meaningful divergence between Polymarket and Kalshi pricing—both reflect the same near-zero positioning. Traditional weather forecasting services do not yet publish July 2026 outlooks with sufficient granularity to establish consensus, leaving the market essentially unpriced until late June 2026.

Helsinki's July temperatures historically cluster between 19–24°C for daily highs, with extremes reaching 29–30°C during heat waves. The 1972 record high of 33.5°C remains an outlier; most years see peaks in the 20–26°C range. Comparable markets on other European cities show traders typically price temperature bands symmetrically around climatological norms once forecasts become available, usually 10–14 days prior to settlement. The current 0% reading reflects the absence of actionable meteorological data rather than confidence in any specific outcome.

Traders should monitor European summer weather patterns from late June onwards, particularly the North Atlantic Oscillation and high-pressure systems over Scandinavia. Finland's meteorological institute (Ilmatieteen Laitos) publishes extended forecasts from mid-June that will anchor market repricing. Any significant heatwave warnings for Northern Europe in early July would shift implied probabilities toward higher temperature ranges; conversely, persistent low-pressure systems would favour cooler bands. Settlement occurs at 12:00 UTC on 13 July, with final data available within hours thereafter.

Methodology

We track Highest temperature in Helsinki on July 13? 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 PolyGram. 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.

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 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.