How Weather Conditions Affect Matches on Outdoor Courts
Paris, May 2026. The thermometers at Roland Garros climbed past 33 degrees — something even the old-timers of the French Open struggle to remember. Players grabbed ice packs, fans hid beneath the stands, and balls on the clay courts bounced like mad. World No. 1 Aryna Sabalenka compared what was happening to a “roller coaster.” Organisers, in a panic, watered the courts with a saline solution so the clay would not crack. And that was only one tournament. Clearly, weather in outdoor tennis is a full-fledged player, sometimes influencing the result more than the opponent.
For those who treat tennis betting as an analytical task, understanding meteorological nuances is an essential necessity. Because in a world where the ball weighs differently depending on temperature, and wind turns the serve into a lottery, bookmakers’ odds often lag behind reality.
Thermodynamics and other features
High temperature is the main catalyst for change on outdoor courts. Dry, hard clay makes the ball bounce higher and fly faster. A study presented at the EGU General Assembly in 2026 confirms that under severe heat stress, serve and return efficiency declines, while the number of unforced errors rises.
Who benefits from this? Above all, aggressive players with a powerful serve and strong topspin. In hot weather, the advantage more often goes to those who can seize the initiative quickly:
<ul>
<li>tennis players with a heavy first serve;</li>
<li>players who actively use topspin;</li>
<li>athletes comfortable in short rallies;</li>
<li>opponents capable of pressing with pace before the exchange becomes drawn out.</li>
</ul>
Stefanos Tsitsipas, whose ranking collapsed to 79th place, stated directly that heat gives him an “additional advantage.” His ball becomes heavier and livelier. Daniil Medvedev, by contrast, hits flatter and feels uncomfortable in such conditions — the shot does not “sit,” and opponents return it easily.
Iga Świątek, a four-time Roland Garros champion, confirms that playing with spin is easier in the heat, but controlling the ball becomes harder. In cooler weather it is heavy and slow, allowing players to put full force into their shots. At high temperatures, however, the ball turns explosive — one mistimed strike, and it flies beyond the court.
By the way, since the 2026 season, a new heat rule has been in force on the ATP Tour. It is tied to the WBGT index — a measure that takes temperature, humidity, and radiation into account.
<table border=”1″ cellpadding=”10″ cellspacing=”0″ style=”border-collapse: collapse; width: 100%;”>
<tbody>
<tr>
<td>WBGT index</td>
<td>What happens</td>
</tr>
<tr>
<td>Above 30.1°C</td>
<td>Players may take a 10-minute cooling break after the second set</td>
</tr>
<tr>
<td>Above 32.2°C</td>
<td>The match is suspended</td>
</tr>
<tr>
<td>Up to 30.1°C</td>
<td>The encounter continues without a special heat break under this rule</td>
</tr>
</tbody>
</table>
At the Australian Open, where temperatures in January 2026 rose to 42°C, organisers closed the roofs on the central courts twice.
Wind: the invisible opponent
When it comes to tennis, the wind is the biggest hazard. It does not change the playing field conditions or increase the ball’s bounce, but it does make each shot unpredictable. High lobs become hazardous in windy conditions, and players lose their normal trajectory. Research during the Australian Open found that the wind had a direct impact on the intricacy of rallies and the unpredictability of shots. Since the ball is less impacted by air currents while playing flat and low, players with these skills tend to win more frequently. Players with a high serving arc or aficionados of lobs risk getting the ball back in an unexpected position.
The frequency of aces decreases and the number of double faults increases in windy weather, which is the practical takeaway. This should be considered when placing bets on handicaps and totals. While players adjust to the strong wind, matches played on outdoor courts typically conclude with relatively low scores in the first sets.
Air humidity
The game is burdened by the unseen burden of high humidity. Physiological and mechanical mechanisms are both activated simultaneously.
The fuzzy felt of the tennis ball starts to collect small atmospheric moisture particles when humidity levels are extremely high, as is common on courts in Singapore and Miami. The literal weight of the ball increases. The length of rallies increases, victories become more elusive, and the rate at which the string bed loses control of the racket accelerates.
Humid conditions are unbearable for the athletes. Sweating is no longer an efficient means of cooling the body. Under these circumstances, stamina plummets like an avalanche, and the victor is the one who can keep their heart rate up, not the one who lines up their strokes more accurately.
