Highest temperature in Helsinki on July 13?

Platform comparison

Market context

Helsinki's peak temperature on 13 July 2026 will be measured at Vantaa Airport and resolved against historical weather data. The settlement window closes at midday on the day itself, meaning traders must rely on forecast models and seasonal patterns rather than observed conditions. The 0% crowd-implied probability suggests either extreme confidence in a specific temperature band or minimal trading activity on this contract.

July temperatures in Helsinki typically range between 17–23°C, with historical highs occasionally reaching 25–27°C during warm spells. The city's maritime climate moderates extremes compared to inland Finland. Looking at comparable July days at Vantaa over the past decade, peaks above 25°C occur in roughly 30–40% of cases, whilst temperatures exceeding 28°C remain rare. The current zero probability assigned to at least one outcome band indicates either that traders have converged on a narrow range or that the market lacks sufficient liquidity to reflect genuine uncertainty across all temperature brackets.

European summer weather patterns for early July 2026 will depend on Atlantic pressure systems and any high-pressure ridges extending northward from the continent. The Finnish Meteorological Institute publishes extended forecasts approximately two weeks ahead, though their skill at pinpointing daily maxima beyond ten days remains limited. Traders should monitor mid-June weather model consensus and any anomalous warming signals from late June onwards, as these will provide the most reliable signals for adjusting positions away from the current flat probability distribution.

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

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 Best Prediction Markets. 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.

Do I need to KYC for this market?

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