Highest temperature in Helsinki on July 13?

Platform comparison

Market context

Helsinki's summer weather on 13 July 2026 will determine the settlement of this temperature range contract, with resolution tied to the highest reading recorded at Vantaa Airport throughout that calendar day. The market currently prices all temperature bands at zero, reflecting either insufficient liquidity or genuine uncertainty about which range will validate. Traders holding USDC on Polygon can enter conditional token positions across the available brackets, with payoff determined by Wunderground's historical weather database for that specific station and date.

Helsinki's July temperatures historically cluster between 18–24°C, though heat waves occasionally push daily highs toward 28–30°C. The city's record July maximum stands at 33.2°C, set in 2010 during an exceptional European heat event. Vantaa Airport, situated north of the city centre, typically records slightly cooler readings than central Helsinki due to proximity to water and lower urban heat effects. Recent decades show increasing frequency of days exceeding 25°C in mid-summer, though sustained heat above 28°C remains uncommon for this latitude and season.

Traders should monitor European summer weather patterns from late June onwards, particularly the position of high-pressure systems over Scandinavia and any Atlantic storm tracks that might deliver cooler air masses. The North Atlantic Oscillation index and forecasted jet stream behaviour in early July will signal whether anomalous heat or near-normal conditions are likely. Finnish Meteorological Institute seasonal outlooks, typically released in early summer, provide baseline expectations for the broader period and can help calibrate which temperature brackets warrant liquidity.

Methodology

This page reviews Highest temperature in Helsinki on July 13? 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 Polymarket Scam?, which mirrors the Polymarket order book at 0% fees.

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.

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 Polymarket Scam? trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.