Highest temperature in Wellington on August 15?

Platform comparison

Market context

On 15 August 2026, Wellington International Airport will record its highest temperature for that date. The crowd currently assigns this outcome zero probability, suggesting consensus expects cooler conditions or that traders are anchored to historical August patterns in the capital. Resolution will depend on the Daily Observations table from Weather Underground rather than summary figures, a distinction that matters when intraday peaks diverge from official highs.

Wellington's August climate sits firmly in the Southern Hemisphere winter, with median daily maxima around 12–13°C at the airport station. Historical August 15th records show considerable variation; the station has recorded highs ranging from approximately 8°C to 18°C on this specific date across recent decades. The 0% implied probability reflects baseline expectations that August will deliver typical winter temperatures rather than anomalous warmth, though the market structure itself—resolving to temperature ranges rather than a binary outcome—means traders must assess which bracket is most likely rather than whether an extreme event occurs.

Meteorological drivers for Wellington in mid-August centre on Southern Ocean pressure systems and the frequency of northwesterly föhn winds, which can produce sharp warming events. The New Zealand MetService issues extended forecasts roughly two weeks ahead; traders should monitor those releases from late July onwards for signals of unusual anticyclonic activity or warm air masses moving south. Seasonal climate indices and El Niño–Southern Oscillation status, updated monthly by NIWA, provide longer-term context for whether August 2026 tracking warmer or cooler than the thirty-year normal.

Methodology

This page reviews Highest temperature in Wellington on August 15? 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 Who Will Win 2026, 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

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.

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.

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.