Understanding game day weather

The 2026 World Cup spans three countries, 16 venues, and a summer tournament schedule that will put teams from cooler climates — Norway, Scotland, Canada, Belgium — directly into some of the most challenging heat and humidity conditions in North American sport.

Research consistently shows that core body temperature is the primary limiter of endurance performance. As ambient heat and humidity rise, the body's ability to shed heat through sweat evaporation is compromised, cardiac output shifts from muscles to skin cooling, and both sprint speed and decision-making deteriorate. Studies of international football show a measurable drop in high-intensity running distances above certain wet bulb thresholds.

For fans, the risk is equally real. Outdoor stadiums in June and July regularly produce conditions that are medically classified as dangerous for sustained outdoor exposure — especially for elderly attendees and those not acclimatised to Gulf Coast summers.

Dew point is the temperature to which air must be cooled for water vapour to condense into dew. Crucially, it measures the absolute amount of moisture in the air, independent of the air temperature — which makes it more reliable than relative humidity as a comfort indicator.

Relative humidity tells you what percentage of its maximum moisture capacity the air holds at its current temperature. The problem: cold air holds very little moisture, so 80% RH on a 45°F morning feels crisp, while 60% RH on a 90°F afternoon feels oppressive. Dew point cuts through this variability.

WC26WX displays dew point alongside temperature and humidity so you can immediately understand not just how hot it is, but how heavy the air feels — particularly relevant for outdoor venues in Houston, Miami, and the Gulf Coast corridor.

Wet bulb temperature (Tw) is the lowest temperature achievable through evaporative cooling. Imagine a thermometer wrapped in a wet cloth and exposed to airflow — as water evaporates, it draws heat from the bulb. How cool it gets depends on how much moisture the air can still absorb. In very humid air, evaporation slows and the wet bulb temperature approaches the dry air temperature. In dry air, evaporation is fast and the gap is wide.

This is exactly how your body cools itself. Sweat evaporating from your skin is your primary defence against overheating. When wet bulb temperature is high, that defence becomes less effective — and above a critical threshold, it fails entirely.

WC26WX uses the Stull (2011) formula — a peer-reviewed meteorological approximation accurate to ±0.3°C across the full range of temperature and humidity conditions — to calculate wet bulb from the live temperature and humidity readings at each stadium's GPS coordinates.

The wet bulb comfort indicator in the top-right of the widget reflects the current Tw at that specific stadium — calculated live from the Open-Meteo hourly feed at the venue's exact GPS coordinates.

FIFA's Medical Regulations permit — and in some conditions require — cooling breaks during matches when heat stress thresholds are exceeded. These are typically taken somewhere around the 20–25 and 65–70 minute marks, giving players approximately 90 seconds to rehydrate and cool down with cold towels and water.

The trigger is based on the WBGT (Wet Bulb Globe Temperature) index, which also accounts for solar radiation load — essentially the wet bulb temperature adjusted for direct sun exposure. FIFA mandates cooling breaks above 28°C WBGT (~82°F), and may consider schedule adjustments above 32°C WBGT (~90°F).

Wet bulb calculated via Stull (2011) from live Open-Meteo data at each stadium's GPS coordinates. RH values are current hourly readings. Readings update every 10 minutes in the widget.

WC26WX is a real-time weather widget built for the The Kickaround covering all 16 FIFA World Cup 2026 host stadiums. It fetches live conditions directly from Open-Meteo — a free, open-source meteorological API — at each stadium's exact GPS coordinates, not just the nearest city.

Temperature, humidity, and rain chance are pulled from the live hourly feed. Dew point and wet bulb temperature are calculated client-side using peer-reviewed meteorological formulas (Magnus approximation for dew point; Stull 2011 for wet bulb).

The next-match tab shows the upcoming scheduled FIFA fixture at each venue, with a forecast interpolated to the exact kick-off hour from Open-Meteo's hourly data, available up to 7 days ahead.

Data refreshes automatically every 10 minutes. Add to your home screen or dock for one-tap access throughout the tournament.