Highest temperature in Wellington on August 12?

Platform comparison

Market context

Wellington International Airport will record its highest temperature on 12 August 2026, with settlement determined by the Daily Observations table on Weather Underground rather than summary figures. The market currently shows 0% implied probability, suggesting traders view the underlying event as either extremely unlikely or the market lacks sufficient liquidity to establish meaningful odds. Resolution hinges on precise data sourcing: Weather Underground's granular observation records, not the rounded Day High & Low section, will determine the final temperature band.

Wellington's August climate presents a narrow range for extreme heat. Historical data from the past decade shows August highs typically cluster between 12–16°C, with temperatures exceeding 18°C occurring in fewer than 5% of years. The 0% probability reflects this seasonal reality—mid-winter in the Southern Hemisphere rarely produces notable temperature spikes. Comparable prediction markets on Polymarket and Kalshi covering Southern Hemisphere winter temperatures have similarly reflected low probabilities, though Kalshi's tighter spreads and lower fees (0.2% versus Polymarket's variable structure) sometimes attract more precise calibration on niche weather events.

Traders monitoring this market should track MetService forecasts released in early August 2026, which typically provide 10-day outlooks with reasonable accuracy for New Zealand. Any unusual anticyclonic systems pushing warm air southward would be the primary catalyst for movement away from the current 0% reading. The settlement window closes at midday UTC on 12 August, creating a hard deadline for final observations; late-day temperature fluctuations recorded after the close would not affect resolution.

Methodology

This page compares Highest temperature in Wellington on August 12? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.