Solar Eclipse 2025: Cloudflare Radar Shows Traffic Drops Track the Path of Totality

On August 12, 2025, a total solar eclipse crossed the North Atlantic, sweeping over Iceland and northern Spain and Portugal, with a deep partial eclipse over the rest of Western Europe. It was the first total solar eclipse to cross mainland Europe in twenty years, and millions stepped outside to watch. Cloudflare Radar's HTTP request data shows that the eclipse had a measurable, predictable effect on internet traffic: as the moon obscured the sun, traffic dropped; as the sun reappeared, traffic rebounded.

Traffic dips align with maximum obscuration

Cloudflare compared HTTP request volume in five-minute buckets on eclipse day against a baseline of the median of the three previous Wednesdays, matched by time of day. The resulting heatmap shows a clear pattern: the black diamonds marking maximum eclipse overlay the darkest red (below-normal traffic) almost perfectly. The deeper the eclipse, the deeper the trough.

In countries along the path of totality and those with deep partial coverage—Iceland, Ireland, the UK, France, Spain, and Portugal—traffic fell by roughly 15% to 30% in the 15-minute window surrounding maximum eclipse. In countries where the sun was barely obscured (Sweden, Denmark, Poland, Switzerland), the dip was minimal or absent. The scatter plot of peak obscuration versus traffic dip shows a consistent downward trend, indicating the eclipse itself—not random variance—was the primary driver.

Iceland, Spain, and Portugal hit hardest

Country-level trend lines show the most dramatic drops in Iceland, Spain, and Portugal, with changes ranging from -9.3% to -46.7%. Poland and Denmark returned to pre-eclipse levels quickly, while Norway and Sweden actually saw slight traffic increases above baseline. The eclipse began its path over Alaska around 15:35 UTC, and the traffic effects followed the moon's shadow across the continent.

Cloudflare calculated obscuration using precise sun and moon positions, computing the geometric overlap of two circles every five minutes to determine each region's peak obscuration and moment of maximum eclipse. This allowed them to correlate traffic changes with the eclipse's progression with high temporal precision.

What this tells us about human attention

The data is a reminder that internet traffic is a direct reflection of human attention. When a shared physical event like a total eclipse captures people's focus, digital activity pauses—not because of network failures, but because people choose to look up. The fact that traffic rebounds within minutes of maximum coverage suggests that the drop is a deliberate, temporary shift in attention, not a systemic disruption.

This is the second time Cloudflare has documented this effect; they did the same for the 2024 total eclipse in North America and the 2026 World Cup. The pattern is consistent: major physical-world events measurably reshape online behavior.