The report places the forecast wet-bulb globe temperature (WBGT) in the high 70s, close to 80. That points to a noticeable heat load, although it remains well below the extreme level projected for another day, when the WBGT could rise above 90.
Humidity is expected to stay near 50%, while the point of dew is forecast to remain in the 60s. Those conditions should allow perspiration to cool the body reasonably efficiently, helping players sustain repeated efforts for longer than they might in heavier, more humid weather.
The sun will still be relatively high at kickoff. The report says it will sit just below 50 degrees above the horizon, making hydration, shade and sun protection important for supporters and substitutes on the touchline.
Germany may look to impose control through possession, but the afternoon conditions could reward a measured approach rather than relentless pressing. Paraguay’s ability to defend compactly and attack in transition may become more valuable if the match remains open late.
With the WBGT near 80, intense bursts should remain possible, but recovery between sprints could become progressively harder. The team that manages its tempo and substitutions most effectively may gain an advantage in the final stages.
Gillette Stadium usually uses an artificial surface, but the report says natural grass has been installed for the tournament. A cited study found little difference in WBGT between synthetic and natural turf, meaning the surface is unlikely to materially alter the heat burden.
Its greater influence may come through footing, ball movement and player confidence.
The opening phase will reveal whether the forecast encourages fast starts or cautious management. The longer-term storyline will be how both squads adapt to warm afternoon kickoffs as the tournament schedule advances.