Highest temperature in Helsinki on July 13?

Platform comparison

Market context

On 13 July 2026, the highest temperature recorded at Helsinki Vantaa Airport will determine which range this market settles into. The settlement window closes at 12:00 UTC that day, with resolution sourced directly from Weather Underground's historical data for the station. Current crowd-implied probability sits at 0% YES, suggesting traders are either awaiting clarity on which temperature bracket the market references, or the specific range in question falls outside historical norms for mid-July in Helsinki.

Helsinki's July temperatures typically peak between 20–25°C, with historical highs occasionally reaching 28–30°C during warm spells. The city's maritime climate moderates extremes; records show that temperatures above 30°C occur roughly once per decade in summer months. Comparable July days at Vantaa Airport over the past twenty years provide a baseline: most settle in the 18–24°C range, with outlier warm days pushing toward 26–28°C. The 0% probability reading suggests the market may be pricing a range significantly above or below these historical patterns, or traders lack sufficient confidence in long-range forecasts this far ahead.

No major weather announcements or seasonal forecasts specific to early July 2026 are yet available; standard meteorological outlooks typically emerge 10–14 days before the event. Traders should monitor European weather services (ECMWF, Météo-France) in late June for any signals of unusual heat or cool patterns. Divergence between prediction-market odds and sportsbook lines remains unclear at this stage, given the nascent state of the market and absence of meaningful trading volume.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Kalshi vs Polymarket. 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.

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.