Miami Low Temp June 4: Will 74-75°F Hit?

Miami’s overnight low temperature on June 4 has become one of the sharper short-term weather markets on Polymarket this week. The 74-75°F band carries a 62.5% implied probability, and that number jumped hard in the last 24 hours. Something moved traders’ conviction fast, and the timing points directly to updated National Weather Service forecast models dropping Tuesday morning.

The market question asks: what will be the lowest recorded temperature in Miami on June 4? The primary outcome, 74-75°F, is priced at $0.63 YES and $0.38 NO. The market resolves at noon on June 4, 2026. Total volume stands at $7,621, with $6,422 of that trading in the last 24 hours alone.

How the Miami June 4 Low Temperature Contract Works

This is a multi-outcome temperature market. Traders pick a two-degree band, and the contract that matches the official overnight low pays out. The resolution source is Polymarket’s market resolution mechanism, which relies on verified weather observation data for Miami.

• YES at $0.63 pays out if the overnight low lands between 74°F and 75°F on June 4.
• NO at $0.38 covers every other outcome: a reading above 75°F, below 74°F, or outside this band entirely.

For NO to pay out, Miami’s low must fall outside the 74-75°F window. That means either a warmer-than-expected overnight, which is the more likely alternative given competing bands priced at 76-77°F and 78-79°F, or an unusually cool intrusion pushing the low below 74°F. June in Miami rarely sees overnight lows below 74°F. The climatological average low for early June in Miami runs between 76°F and 79°F, which means the 74-75°F band is already on the cooler edge of historical norms.

Momentum and Market Signals

The momentum composite here is unusually strong for a short-duration weather market. A 22.5% one-hour price jump combined with a 34.5% 24-hour surge and a trend score of 84.74 signals one thing: fresh forecast data landed and traders repriced fast. The most likely driver is a National Weather Service model update showing a modest cold front or dry air intrusion affecting South Florida overnight June 3 into June 4, pulling the expected low below the seasonal average.

Total volume is $7,621, with $6,422 trading in the last 24 hours. Liquidity sits at $27,919, which is reasonably deep for a market this size. Volume is below $1 million, so a single well-sized bet can move this price sharply. The $0.63 price could swing several cents on one updated forecast or a single large order before resolution.

• The 74-75°F band surged from $0.36 at open to $0.63 in roughly 48 hours, a 75% price increase driven by forecast model convergence.
• The one-hour and 24-hour changes (+22.5% and +34.5%) are among the strongest momentum readings in this category, pointing to new information, not noise.
• Competing bands (76-77°F and 78-79°F) are the most likely alternative outcomes if forecast models shift back warmer overnight.
• Volume under $1 million means this market is informationally thin. Price reflects a small group of weather-focused traders, not a crowd.
• The June 4 noon resolution leaves fewer than 21 hours from the timestamp for new data to reprice this contract.

Lines Analysis: Miami’s Overnight Low on June Four

The case for 74-75°F landing rests on the same forecast signal that moved traders Tuesday morning. National Weather Service models for South Florida show a surface trough and drier air mass moving through overnight, which suppresses the typical maritime warmth that keeps Miami nights in the upper 70s through June. When low humidity and light offshore flow combine in early June, overnight lows in Miami can drop to the mid-70s. The market is pricing exactly that scenario.

The barrier to this outcome is Miami’s default climatological warmth. The urban heat island effect, sustained sea surface temperatures in Biscayne Bay, and typical June moisture keep overnight lows above 76°F more often than not in early summer. If the forecast trough weakens or shifts track, the low slides back into 76-79°F territory and the current favorite band misses entirely. The 76-77°F band is the next most liquid alternative, and that spread represents the real uncertainty here.

• National Weather Service Miami area forecast: any model shift warmer overnight June 3-4 would push probability back toward 76-77°F band.
• Surface observations at Miami International Airport after 10 PM Eastern on June 3: early readings trending below 76°F would confirm the trough scenario.
• Dew point readings: a drop below 65°F in Miami overnight supports the lower temperature band landing.
• Biscayne Bay sea surface temperature: sustained warmth above 84°F reduces the overnight cooling effect and tilts risk toward higher bands.
• Any tropical disturbance in the Straits of Florida would increase moisture and push the low warmer, repricing this contract sharply before resolution.

Total volume of $7,621 is thin. The data right now favors the 74-75°F band based on the forecast signal that drove this week’s price surge. But this market is one updated weather model away from repricing completely before the June 4 noon close.

LINES VERDICT

NARROW FAVORITE, THIN MARKET

The forecast signal is real, and traders moved fast on it. But Miami’s climatological warmth and low total volume make this a fragile lead heading into the final hours.

What the market says: A 62.5% implied probability means traders believe the 74-75°F band is more likely than all other outcomes combined, but with less than 21 hours to resolution and volume under $10,000, this price is highly sensitive to any overnight forecast update.

Key unknown: The single most important input is the National Weather Service Miami area forecast update for late Tuesday night into Wednesday morning. If models hold the trough scenario, 74-75°F holds. If models warm the overnight low back above 76°F, the price collapses fast.

Scientific Context

Miami’s early June climate is defined by warm sea surface temperatures, high overnight humidity, and the urban heat island effect of one of the densest metropolitan areas on the US East Coast. The climatological normal overnight low for early June at Miami International Airport runs between 76°F and 79°F. The 74-75°F band sits at the cool edge of that range, roughly one to two degrees below the 30-year average. That deviation is meteorologically plausible on nights with dry air intrusions or offshore flow, but it is not the default expectation. The market is pricing a specific forecast scenario, not the average June night in Miami. Events that would move this price before the June 4 noon resolution include any significant National Weather Service model update, observed surface readings at Miami International Airport after midnight, and dew point trends through Tuesday night.

How likely is a 74-75°F overnight low in Miami in early June?

The 30-year climatological average overnight low for early June in Miami runs between 76°F and 79°F. A reading in the 74-75°F range is possible but below normal, occurring when dry air or offshore flow suppresses the typical tropical moisture.

What does it mean for this contract to resolve NO?

A NO resolution means the official overnight low on June 4 in Miami lands outside the 74-75°F band, either above 75°F or below 74°F. The most likely NO scenario is a warmer reading in the 76-77°F or 78-79°F range.

What data would move this market before resolution?

A National Weather Service forecast update showing a warmer overnight low for South Florida would reprice this contract sharply. Early surface observations at Miami International Airport after 10 PM Eastern on June 3 also carry significant weight.

When does this market resolve?

The market resolves at noon Eastern on June 4, 2026, based on the verified overnight low temperature recorded in Miami on that date.

How reliable is the volume and liquidity in this market?

Total volume is $7,621, which is well below $1 million. Thin volume means the 62.5% price reflects a small number of informed weather traders, not a large crowd, and a single new bet can move the price meaningfully before resolution.