Shanghai June 5 Low Temp: Will 22°C Hold?

Shanghai’s overnight low temperature for June 5 has become one of the more active short-duration weather markets on Polymarket this week. A sharp momentum surge over the past 24 hours pushed the 22°C outcome to a 57.5% implied probability, reflecting trader conviction that the city’s early-June baseline favors that specific threshold. The market is pricing uncertainty, not science, but the meteorological signals are pointing in a clear direction.

The market question asks: what will be the lowest temperature in Shanghai on June 5? The 22°C outcome is priced at $0.58. Competing outcomes including 21°C, 23°C, 20°C, and 24°C split the remaining probability. Resolution closes at 12:00 UTC on June 5, 2026. Total volume stands at $3,121, with $2,728 trading in the past 24 hours alone.

How the Contract Works: Shanghai June 5 Low Temperature

This contract resolves YES for the 22°C outcome if official temperature data confirms that the lowest recorded temperature in Shanghai on June 5 equals 22°C. The competing outcomes (21°C, 23°C, 20°C, 24°C, and others) each trade as separate contracts. Only one outcome resolves YES. Resolution depends on the official measurement source designated by Polymarket for this market.

• 22°C outcome: $0.58 per share, 57.5% implied probability
• 23°C outcome: trades as a separate contract, representing an outcome roughly one degree warmer
• 21°C outcome: trades separately, representing a one-degree cooler result
• 24°C and above: lower probability, reflecting less likely warmer overnight conditions
• 20°C and below: lower probability, reflecting less likely cooler overnight conditions

For 22°C to miss, Shanghai’s overnight low must settle at any other integer value. June in Shanghai is characterized by warm, humid conditions ahead of the plum rain (meiyu) season. Overnight lows cooling to 21°C or below would require a stronger-than-expected cold air intrusion. Warming to 23°C or above would suggest an unusually warm maritime air mass sitting over the Yangtze Delta. Either deviation is possible but statistically less common for early June in this region.

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Momentum and Market Signals: A Sharp 24-Hour Surge

The momentum composite here is notable. A combined 1-hour gain of 11% and 24-hour gain of 21% on the 22°C outcome, paired with a trend score of 73.29, signals a rapid convergence of trader positioning. That kind of movement in a 24-hour window typically reflects incoming weather model data or updated forecast consensus aligning around a specific temperature band. Here’s what the measurements are telling us: traders are treating 22°C as the meteorological anchor for tomorrow’s overnight low.

Total volume of $3,121 is thin. The $2,728 in 24-hour volume represents the bulk of all trading in this market. Liquidity sits at $16,540, which is relatively healthy against the volume level, but thin total volume means a single moderate-sized order can move this price sharply. Treat the 57.5% figure as directionally meaningful, not precisely calibrated.

• The 22°C outcome gained 21% over 24 hours, the strongest directional signal in this market’s short history
• 1-hour momentum of +11% suggests trader positioning accelerated on June 4 as forecast models updated
• Total volume below $5,000 means this market is susceptible to outsized price moves on thin order flow
• Liquidity of $16,540 is adequate but amplifies the impact of any late large trade before resolution
• Trend score of 73.29 places this among the more directionally committed short-duration weather markets

Lines Analysis: Shanghai’s Early-June Temperature Baseline

Shanghai’s early June climatology supports the 22°C range as a plausible overnight low. The city’s average minimum temperature in early June typically sits in the low-to-mid 20s Celsius, with the onset of the meiyu front occasionally dragging overnight lows slightly cooler or trapping warm moist air and pushing them higher. The data doesn’t care about the politics, and the meteorological baseline genuinely centers around 22°C as a reasonable modal outcome for this date range.

The case against 22°C landing as the precise overnight low is straightforward: weather forecast precision at the single-degree level is limited even 24 hours out. A stronger southwesterly flow off the East China Sea could push the overnight low to 23°C or 24°C. A brief continental air intrusion from the north could pull it to 21°C. Either scenario would wipe out the 22°C contract entirely, as no partial credit exists in a discrete outcome structure like this.

• Shanghai Meteorological Service forecast updates within 12 hours of resolution will be the decisive signal for late traders
• Any shift in the regional synoptic pattern (surface low development or cold front passage) would reprice the 21°C contract sharply higher
• Sustained southerly winds overnight on June 4-5 would favor the 23°C outcome over 22°C
• The meiyu front position relative to the Yangtze Delta is the single most important meteorological variable before resolution
• A late-breaking weather model run showing deviation from the current consensus would be the wildcard repricing event

Total volume of $3,121 is modest. The momentum data favors 22°C as the current consensus anchor. But at this volume level, thin liquidity means the price reflects a small number of traders, not a deep market signal. The data composite leans toward 22°C, but precision at a single-degree level in a weather market this close to resolution carries genuine uncertainty that the current price may be underweighting.

LINES VERDICT

Thin Market, Real Signal

The momentum composite and forecast-aligned positioning give 22°C a credible edge, but single-degree precision in a sub-$5,000 weather market with hours left to resolution is a fragile hold.

What the market says: 57.5% probability for 22°C as Shanghai’s June 5 overnight low. The price moved sharply on June 4 and thin volume means it can move just as sharply again before the June 5 resolution window closes.

Key unknown: The final Shanghai Meteorological Service forecast update and any last-hour weather model revision showing a shift in the overnight low band would immediately reprice all competing outcomes in this contract.

Scientific Context: Shanghai June Temperature Patterns

Shanghai’s June overnight lows are shaped by the city’s position at 31°N on the eastern coast of China, where the transition from spring to meiyu season creates variable overnight temperature conditions. Early June historically sees minimum temperatures clustering in the 20°C to 24°C range, with 22°C sitting near the center of that distribution. The discrete nature of this contract means the full probability weight of nearby temperature outcomes is split across multiple markets, making any single outcome difficult to price above 60% to 70% even when the forecast is relatively confident.

Before resolution at 12:00 UTC on June 5, the events most likely to move price are a new synoptic weather chart showing front passage, an updated regional forecast from Chinese meteorological authorities, or simply a large late trade in the thin order book. All three can happen within hours of resolution.

Will the lowest temperature in Shanghai on June 5 be 22°C?

57.5% probability means traders give slightly better than even odds to this specific outcome. Weather markets at single-degree resolution are inherently noisy. The current probability reflects directional confidence in the low-twenties temperature band, not certainty about the exact integer.

What does it mean for 22°C to lose?

Any overnight low that registers at 21°C, 23°C, or any other integer would resolve the 22°C contract at zero. Competing outcome contracts would pay out instead. No partial value exists in this structure.

What data event would most move this price?

A Shanghai Meteorological Service forecast update or a new weather model run showing the overnight low shifting outside the 21°C to 23°C band would immediately reprice this contract and its competitors.

When does this market resolve?

Resolution closes at 12:00 UTC on June 5, 2026. Given the short duration, price movements between now and resolution will be driven entirely by incoming weather data and any late trader positioning.

How reliable is the volume signal here?

Total volume of $3,121 is thin. Low volume means price reflects a small number of traders. Liquidity of $16,540 provides some buffer, but a single moderate trade can move this price materially before resolution.