Mobile Traffic Drops When the Classroom Calls

In the Northern Hemisphere, where roughly 87% of the world's population lives, September marks the end of summer breaks. That seasonal shift shows up clearly in Internet traffic patterns. Cloudflare Radar data reveals a consistent global trend: mobile devices lose ground to desktop traffic as schools and offices reopen after the summer months.

Compared with the four weeks of August, the percentage of Internet traffic coming from mobile devices fell by 2% on some days in early September 2021, and by more than 3% toward the end of the month. Desktop traffic correspondingly gained share in September when measured against complete weeks in August, a comparison that accounts for the regular differences between weekdays and weekends.

The change is not uniform across the globe. Back-to-school calendars, public holidays, and COVID-related closures each create their own variations in the data.

Europe’s September Shift

European countries present a fairly coherent picture, largely because most start their school year within the first two weeks of September. Finland, Norway, Sweden, and Denmark are exceptions, beginning in late August. In several countries, including Poland, Malta, Portugal, Italy, and Spain, mobile traffic’s share of total Internet traffic dropped by more than 5% during specific periods in September.

In Spain, where mobile devices normally account for about 45% of Internet traffic, the school year began on Monday, September 6. That week, the mobile share lost more than 5% in importance on some days, and the decline deepened the following week.

Portugal followed the wider European pattern, but with a notable spike on October 5, 2021. That Tuesday was Republic Day, a public holiday, and with most people off work in the middle of the week, mobile traffic’s share rose visibly, peaking around 19:00 local time.

Italy saw mobile traffic fall by as much as 8% in the second week of the school year, before recovering to late-August levels by the end of September. The Netherlands showed a similar normalization after an initial decline. Japan, though its school year starts in April and its summer break runs through July and August, also displayed the same pattern of reduced mobile traffic after classes resumed on September 6.

North America and Asia: Atypical Openings

The United States had an unconventional start to the school year due to COVID. Several states pushed reopening from August into September, with New York City schools opening on September 13, and many districts conducted classes online. Even so, the mobile traffic share dropped noticeably after Monday, September 6.

Canada, where the school year officially began on September 1, also saw mobile traffic lose importance after September 6, with the trend intensifying by month’s end.

China recorded an immediate decline in mobile traffic share when its school year began in early September, but mobile usage recovered in the final week of the month.

Where the Pattern Inverts

Some countries moved against the general trend. Russia saw mobile traffic’s share increase in the days before the school year, likely because many schools remained closed due to COVID and only began opening around September 20. The data shows a clear drop in mobile traffic percentage during that week, aligning with the delayed reopening.

Cyprus, the only EU country where mobile traffic share rose after the first week of school, also experienced COVID-related school closures during that period.

In Nigeria, the most populous country in Africa with roughly 206 million people, the school year was scheduled to begin September 13. However, UNICEF reported that reopening was postponed for several weeks due to the pandemic. Mobile traffic’s share grew during the week of September 13 and only began to decline in late September and early October.

September’s Broader Internet Effect

These shifts go beyond the mobile-versus-desktop split. Worldwide, total Internet traffic in September rose significantly compared with August, with some days exceeding 10% growth. That is unsurprising given that most of humanity lives in the Northern Hemisphere, where August is a summer vacation month for many, and September brings both students and workers back to their routines. Even in countries like India, where August brings the monsoon rather than summer holidays, September still marks a return to regular schedules for large segments of the population.