Wellington High Temperature July 28: Will It Hit Twelve?

Wellington sits in the middle of its winter right now, and the market has made a call. The 12°C outcome carries a 76.5% implied probability heading into the July 28 resolution window. That signal came fast: the 12°C contract gained 15% in the last 24 hours, a sharp reprice driven by incoming forecast data aligning with that specific threshold. The market is pricing uncertainty, not science, but here the two are converging.

The question is straightforward. The market asks: what will Wellington’s highest temperature be on July 28? The 12°C outcome is priced at $0.77 YES and $0.24 NO, resolving at 12:00 on July 28, 2026. Total volume stands at $63,682, with $48,701 of that arriving in the last 24 hours alone. That late-breaking volume is the signal worth watching.

How This Contract Resolves

This market resolves on Wellington’s observed daily maximum temperature for July 28, 2026. The resolution source is market resolution, meaning the platform will use an official temperature reading for Wellington for that date. Each outcome represents a discrete temperature bucket. Only one outcome pays out.

• YES ($0.77, 76.5% implied): Wellington’s daily maximum on July 28 lands at exactly 12°C.
• NO ($0.24, 23.5% implied): Wellington’s daily maximum on July 28 lands at any other value, including 11°C, 13°C, 10°C, 14°C, or any other listed outcome.

Wellington’s July daily highs typically cluster between 11°C and 13°C in winter. The alternative outcomes that pose the most realistic threat are 11°C and 13°C. A colder-than-forecast southerly front pushing through the Cook Strait could pull the maximum down to 11°C. A brief ridge of high pressure extending from the Tasman Sea could push it to 13°C. Both scenarios are meteorologically plausible within a 24-hour window, which is why NO holds 23.5%.

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Momentum and Market Signals

The momentum composite here is unambiguous. A flat 1-hour change, a 15% 24-hour gain, and a trend score of 46.13 together point to a single driver: forecast data published or updated in the last day aligned tightly with the 12°C threshold. When a short-duration weather market moves 15% in 24 hours on a contract this close to resolution, it means traders with access to Wellington forecast models moved capital quickly and decisively.

Total volume of $63,682 is thin by most standards, and $48,701 of it arrived in the last 24 hours. Liquidity sits at $43,558. These are modest figures. Thin liquidity means a single large trade can move this price sharply before the 12:00 resolution tomorrow. Anyone watching this contract should treat the current 76.5% as a live number, not a settled one.

Key Factors

• The 24-hour price gain of 15% reflects a directional consensus shift tied to updated Wellington forecast data released in the last day.
• The 1-hour price change of 0.0% suggests the market has stabilized at current levels and is waiting for the observation itself.
• Wellington’s July climatology centers on daily highs between 11°C and 13°C, with 12°C sitting at the statistical mode for this time of year.
• Low total volume below $100,000 means this contract is sensitive to new information and a single data update could reprice the outcome by several percentage points.
• Resolution occurs at 12:00 on July 28, giving almost no time buffer after the forecast window closes for a correction trade.

Lines Analysis: Wellington on July 28

The data doesn’t care about the politics, and here the data is pointing clearly at 12°C. Wellington’s winter maximum temperatures are well-documented. July averages a daily high around 11°C to 12°C, with the city’s coastal exposure and northerly flow often nudging readings toward the top of that range. The forecast alignment that drove the 24-hour price surge suggests at least one major weather model placed the July 28 maximum squarely at 12°C. That kind of model consensus is what moves short-duration weather markets.

Here’s what the measurements are telling us about the alternative scenario. A 13°C outcome requires warmer-than-forecast northerly flow, while an 11°C outcome requires a stronger-than-expected southerly intrusion. Both are real meteorological possibilities within a single-day window. Wellington’s weather is famously variable. The Cook Strait funneling effect can shift temperatures by 2 to 3 degrees within hours. That variability is exactly why 23.5% of capital is sitting on NO, spread across the adjacent outcome buckets.

Signals to Monitor

• MetService New Zealand’s July 28 forecast update, particularly any southerly change warnings, would directly reprice the 11°C and 12°C outcomes.
• A Tasman Sea high-pressure ridge extending toward Wellington would support the 13°C outcome and reduce the 12°C probability.
• Cook Strait wind direction at dawn on July 28 is a reliable leading indicator of whether the day’s maximum leans warmer or cooler.
• Any forecast model ensemble shift showing tighter agreement on 12°C would push the YES price higher before resolution.
• An observed morning temperature well above or below seasonal normal by 07:00 local time would reprice all adjacent outcomes rapidly.

Total volume of $63,682 is too thin to call this a deeply liquid, high-confidence market. The 76.5% probability reflects real forecast signal, but Wellington’s single-day temperature variability means a late forecast revision could shift things meaningfully before 12:00 tomorrow. The data currently favors 12°C, but the margin for adjacent outcomes remains real.

LINES VERDICT

Twelve Degrees, Narrowly Confirmed

Wellington’s winter climatology and the 24-hour price surge both point to 12°C as the most likely July 28 maximum. The forecast alignment driving that move is the clearest signal in this market.

What the market says: At 76.5% implied probability, the market treats 12°C as the strong favorite but not a certainty. Thin volume below $100,000 means this price is sensitive to any forecast update before the 12:00 resolution on July 28.

Key unknown: Any MetService forecast revision issued in the next 18 hours that shifts the predicted maximum by even one degree would reprice this contract materially before resolution.