Highest temperature in Helsinki on July 13?

Platform comparison

Market context

Helsinki's highest temperature on 13 July 2026 will be measured at Vantaa Airport, the city's primary meteorological station. The current market pricing reflects zero probability assigned to any outcome, suggesting either insufficient liquidity or a settlement mechanism awaiting activation. On Polygon, traders would need to acquire conditional tokens representing specific temperature bands—denominated in USDC—with payoff determined by Wunderground's historical weather data for that single day.

July temperatures in Helsinki typically range between 15–22°C, though heat waves can push readings into the mid-to-high twenties. The city's record July high stands at 33.2°C, set in 1972, but such extremes remain statistical outliers. Over the past decade, mid-July highs have clustered around 18–21°C, with only occasional spikes above 25°C. This historical distribution should anchor expectations: most outcomes will fall within the 18–24°C band, whilst readings above 28°C or below 15°C represent tail events requiring significant atmospheric anomalies.

Traders monitoring this contract should track European weather forecasts from mid-June onwards, particularly jet-stream positioning and high-pressure systems over Scandinavia. The Finnish Meteorological Institute publishes seasonal outlooks and extended forecasts that precede Wunderground's final settlement data. Any unusual Arctic warming or Atlantic blocking patterns in early July could shift probability mass toward higher temperature ranges. Settlement occurs at 12:00 UTC on 13 July, with Wunderground's daily maximum serving as the binding reference—no appeals or disputes are possible once that figure is published.

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

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

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.

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.