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Jeddah July Nine: Will the High Hit Thirty-Nine?

Jeddah July Nine: Will the High Hit Thirty-Nine?

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SR Sofia Renard Climate & Science Analyst
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Lines Verdict
YES at 93% implied probability

PLAUSIBLE BUT UNCONFIRMED: The 39°C bucket sits inside Jeddah's realistic July range, but thin volume and no forecast confirmation make 29.5% a prior, not a data-backed call. Market probability: 29.5%.

93% Market Probability
1h +13.5% 24h +61.5% Trend Moderate (62/100)
Volume
$38.2K
$25.7K in 24h
Liquidity
$131.4K
Deep liquidity
Time Left
4 hours
Resolves Jul 9
38K Vol. Jul 9, 2026
38°C $5K Vol.
93%
39°C $4K Vol.
6%
40°C $5K Vol.
1%
41°C or higher $8K Vol.
0%
31°C or below $2K Vol.
0%
32°C $2K Vol.
0%

Jeddah sits at roughly 21 degrees north latitude, directly on the Red Sea coast, and July is its most punishing month. The market has placed the 39°C outcome at just under 30 percent probability, which means traders are spreading their conviction across several competing bands rather than converging on one number. That spread is the story here, not any single outcome.

The market question asks: what is the highest temperature in Jeddah on July 9, 2026? The 39°C bucket trades at 0.30 YES and 0.71 NO, implying a 29.5 percent chance. The market closes at 12:00 UTC on July 9, 2026. Total volume stands at $4,869, all of it in the last 24 hours, which signals this market just opened or just attracted its first meaningful activity.

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How This Contract Resolves

This contract resolves YES if Jeddah’s recorded high temperature on July 9, 2026 lands exactly at 39°C, based on the designated resolution source. Every other temperature bucket, from 31°C or below up through 41°C or higher, trades as a separate contract. A trader betting YES on 39°C is betting on a specific one-degree window, not a directional temperature call. That precision is the core mechanic here.

  • YES (0.30): The recorded high on July 9 falls within the 39°C bucket, resolving this specific contract as correct.
  • NO (0.71): The recorded high falls in any other temperature bucket, whether lower or higher than 39°C.

The NO side collects on any temperature outside that single degree window. Jeddah’s July highs cluster between 38°C and 42°C historically, so the relevant competition is from the 40°C and 41°C-or-higher buckets, not from cooler outcomes. A hotter-than-expected day pushes probability out of 39°C and into higher bands.

Momentum and Market Signals

The momentum composite, a 2.0 percent gain in the last hour with a trend score of 39.04, suggests modest but real buying pressure toward the 39°C outcome. The likely driver is traders anchoring to historical July averages for Jeddah, which tend to cluster in the 38-40°C range, making 39°C feel like the modal outcome even if it captures less than a third of the probability.

Total volume is $4,869 against liquidity of $65,847. That volume figure is well below $1 million, which means this market is thin. A single large bet could shift the 39°C price meaningfully before July 9. Traders should treat current prices as directionally informative but not deeply tested.

  • The 1-hour gain of 2.0 percent on 39°C suggests short-term buying interest, likely tied to traders consulting historical July temperature data for Jeddah.
  • Liquidity at $65,847 is healthy relative to volume, meaning the order book can absorb moderate bets without slippage, but volume itself is extremely thin at under $5,000.
  • The trend score of 39.04 aligns with modest upward momentum, not a conviction move.
  • Trader sentiment reads strongly bearish on 39°C at 70.5 percent NO, which in a multi-bucket market simply reflects the math of distributing probability across eleven outcomes.
  • No whale trades have been recorded, removing any large-bet signal from this analysis.

Lines Analysis: Jeddah Temperature Distribution

Here’s what the measurements are telling us. Jeddah’s July climatology, drawn from Saudi Meteorological Authority records and regional reanalysis datasets, places daily highs most frequently between 38°C and 42°C during the first two weeks of July. The 39°C bucket sits squarely inside that range. Its 29.5 percent probability is plausible for a single one-degree window inside a four-degree competitive zone.

What makes NO real here is not a cold snap. The Red Sea coastal heat well ensures temperatures stay elevated. The actual risk to 39°C as an outcome is that the day runs hotter, landing in the 40°C or 41°C-or-higher buckets. July in Jeddah sees frequent 40°C-plus readings, especially when regional high-pressure systems suppress sea breezes. A dry, calm day on July 9 would push the high toward 41°C, draining probability from the 39°C contract. The data doesn’t care about the politics of which bucket wins.

Signals to monitor before July 9:

  • Saudi Meteorological Authority surface observations for Jeddah through July 8 will establish the temperature trend heading into the resolution day.
  • Regional synoptic pattern: a persistent high-pressure ridge over the Arabian Peninsula typically forces highs toward 41°C or above, threatening the 39°C bucket from the hot side.
  • Red Sea sea surface temperature anomalies affect coastal humidity but have a smaller direct impact on dry-bulb maximum temperature, making them a secondary signal.
  • Any forecast from the European Centre for Medium-Range Weather Forecasts or the GFS model pinning July 9 Jeddah at 39°C would be a strong repricing catalyst for this contract.
  • The 24-hour weather model consensus for July 9 is the single most actionable input available before resolution.

The market is pricing uncertainty, not science. With $4,869 in total volume, the 29.5 percent probability reflects a reasonable prior for a one-degree bucket in a plausible range, but it has not been pressure-tested by large capital. A forecast showing 39°C as the expected high would push this contract above 40 percent quickly. A forecast in the 41°C range would collapse it toward 15 percent.

LINES VERDICT

PLAUSIBLE BUT UNCONFIRMED

The 39°C bucket sits inside Jeddah’s realistic July temperature range, but without a credible weather forecast pinning July 9 at exactly that level, the 29.5 percent probability is a reasonable prior rather than a data-backed conclusion.

What the market says: At 29.5 percent, traders are treating 39°C as one of several competitive outcomes in Jeddah’s typical July range. With resolution in under 48 hours and volume below $5,000, this price will move sharply once numerical weather forecasts for July 9 sharpen.

Key unknown: The July 9 Jeddah maximum temperature forecast from a major numerical weather prediction model is the single input that will reprice every bucket in this market before resolution.

Frequently Asked Questions

It means traders currently estimate a roughly one-in-three chance the recorded Jeddah high on July 9 falls exactly in the 39°C bucket. Eleven separate temperature outcomes compete for total probability.

NO resolves correctly if Jeddah's July 9 high lands in any temperature bucket other than 39°C, including hotter outcomes like 40°C or 41°C or higher, which are the most likely alternatives.

A credible numerical weather forecast pinning Jeddah's July 9 high at 39°C would push the YES price sharply higher. A forecast showing 41°C would collapse it toward 15 percent.

The market resolves at 12:00 UTC on July 9, 2026, based on the recorded maximum temperature in Jeddah for that calendar day.

Total volume is under $5,000, well below the $1 million threshold for high confidence. Liquidity is $65,847, so the order book can absorb bets, but current prices can shift sharply on modest new activity.

We aggregate the live positions of the top 50 Polymarket whales (ranked by 30-day tracked volume) into one composite reading per market. It refreshes every hour. The percentage shows how many of those whales hold YES versus NO; the net dollar position shows the cohort's directional exposure in dollars.

A convergence event fires when three or more tracked wallets buy the same outcome on the same market within a four-hour window. We surface these in the activity feed and the VIP digest.

No. Lines is an editorial and data product. We do not operate prediction markets, custody funds, or accept trades. All trade flows deep-link to Polymarket via our affiliate code. Probabilities shown are market-implied and not predictions or recommendations.

What Could Shift These Probabilities?

Forecast Lands at Thirty-Nine

If major weather models, including the European Centre for Medium-Range Weather Forecasts or GFS, publish July 9 Jeddah forecasts centered on 39°C in the next 24 hours, this contract reprices toward 40 to 50 percent rapidly. Moderate sea breeze activity suppressing the peak just below 40°C would be the physical mechanism. Thin liquidity means even modest buying pressure would push the YES price noticeably.

Regional High Pressure Drives Heat Above Forty

A persistent high-pressure ridge over the Arabian Peninsula, a common July synoptic pattern, suppresses coastal sea breezes and pushes Jeddah highs toward 41°C or above. If forecasts converge on 41°C for July 9, the 39°C bucket loses probability to higher-temperature contracts. The YES price could fall toward 15 percent or lower as the forecast window tightens.

Coastal Cooling Keeps the High in Range

An active Red Sea sea breeze on July 9, driven by a pressure gradient that funnels cooler maritime air inland during peak afternoon hours, could cap Jeddah's high at 39°C or even 38°C. This outcome would rescue the 39°C contract from higher-temperature competition and could also strengthen the 38°C bucket. Coastal humidity effects make this scenario physically realistic, if not dominant.

Dust Event Alters the Temperature Profile

A haboob or dust intrusion from the Hejaz escarpment or Rub al Khali can dramatically alter surface energy balance in Jeddah. Dust events trap longwave radiation and suppress direct solar input in complex, non-linear ways. If a significant dust layer moves over Jeddah on July 8 or 9, all temperature bucket probabilities shift unpredictably, making the resolution outcome genuinely difficult to forecast from prior climatology alone.

Key macro factor: Arabian Peninsula heat extremes in July 2026 are occurring against a backdrop of multi-year warming trends in the Red Sea region, with sea surface temperatures running above historical averages and amplifying baseline heat stress for coastal cities like Jeddah.

Market Timeline

Jul 7, 4:03 AM
Market Created
Jul 7, 4:03 AM
Market Opened
12:00 PM
Market Resolution

Market Comments

Probabilities shown are market-implied and not predictions or recommendations. This content is for informational purposes only.