Highest temperature in Wellington on August 10?

Platform comparison

Market context

Wellington’s temperature outcome for 10 August is normally decided by a narrow band around the low teens Celsius, so the market’s 0% YES implies the crowd is effectively pricing the chance of an unusually warm day at the airport as negligible. August climatology for Wellington supports that caution: NIWA and other climate summaries describe August as the city’s coldest month, with average highs around 12-13°C and average lows near 8-9°C, while historical daily records for early August commonly sit in the 8-14°C range rather than anything much higher.[15][17][5][1] That makes the relevant contract less about a broad seasonal pattern than about whether a one-day spike can break through the usual maritime moderation at Wellington Airport.[11][15]

Comparable weather-history data suggest traders should treat this as a thin-tail temperature bet rather than a normal distribution around the mean. Past August observations in Wellington show many days topping out in the low teens, with occasional cooler outcomes and only limited evidence of extreme warmth, which helps explain why market-implied pricing can stay close to zero until a forecast model moves decisively warmer.[1][5][12] Against that backdrop, any sportsbook-style line that still shows a meaningful over probability would likely be richer than the prediction market, because the market is anchored to the airport station’s actual daily observation rather than a citywide summary figure.[11] The practical read is that consensus should remain low unless late-model guidance starts to point to clear solar break, weak winds, and above-average northerlies.

The main catalysts are the short-range forecast updates and, on settlement day, the hourly Weather Underground daily observations for Wellington Intl Airport, since that table—not the Day High & Low summary—controls the outcome.[11] Current conditions from AccuWeather indicate sunny to partly cloudy weather with a forecast high of 60°F, about 15.6°C, alongside moderate winds and low precipitation risk, which would be consistent with a modestly warmer-than-average result but still not a high-ceiling scenario.[10] Traders should therefore watch whether the forecast high holds near the mid-teens Celsius or is revised down as cloud and wind increase; for this contract, even small forecast changes matter because the market settles on the highest observed reading at the station, not an end-of-day average.[11][10]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Wellington on August 10? 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 Best Prediction Markets UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

UK Frequently Asked Questions

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.

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.

What are the best prediction markets for UK traders in 2026?

For UKGC-regulated markets: Betfair Exchange (sports, politics) and Smarkets (sports, politics, lower commission than Betfair). For broader global event prediction: Polymarket (deepest liquidity, 0% fee, USDC settlement). For US-regulated option: Kalshi (USD, limited UK payment options). Most serious UK traders use a combination of Betfair for regulated sports and Polymarket for broader markets.