Highest temperature in Wellington on August 4?

Platform comparison

Market context

Wellington’s airport temperature on 4 August will settle on the day’s **highest recorded reading** in the Wunderground history feed, so the relevant trading question is whether the airport manages a brief afternoon lift rather than the morning low. August is Wellington’s coldest month on long-run climate data, with average highs around 12–13.6°C and lows near 4–9°C, which frames this as a cool-season market where modest warmth is still possible but large upside is uncommon.[1][2][8]

That historical backdrop explains why a **0% YES** crowd price can still leave room for a small but non-zero outcome if the synoptic set-up turns milder than normal. Comparable August datasets for Wellington show daily highs clustering in the low teens Celsius, with only occasional spikes into the mid-teens, while recent airport-based histories have often stayed in that band rather than producing extreme warmth.[3][6][16] For a programmatic approach, the cleanest workflow is to poll the Wunderground daily history page after the settlement window closes, map the maximum Celsius value to the market’s bins, and avoid relying on general forecasts once the event day is over.[5]

The main catalysts are the local weather drivers that can shift the day’s peak by a degree or two: wind direction off Cook Strait, cloud cover, rainfall timing, and the strength of any passing front. Wellington is known for changeable, windy conditions and August is relatively wet, with around 90–93 mm of rain on monthly averages, so the key watch items for traders are MetService and airport observations around the midday-to-afternoon period rather than long-range seasonal averages.[1][8][9]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 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.