SeptemberOctober

SeptemberOctober is a portmanteau used to describe the period spanning September and October. It is an informal term applied in calendars, planning documents, and project timelines to denote the two-month window for scheduling, budgeting, and forecasting. Because it is not a formal designation, its precise meaning can vary by organization and context.

In the Northern Hemisphere, September and October mark the transition from late summer to autumn, with cooler weather and changing foliage in many regions. In the Southern Hemisphere, the same months occur during late winter to early spring, bringing different climatic patterns. The September–October window can encompass harvest activity, seasonal preparations, and transitional weather systems such as the tail end of summer heat or the onset of seasonal rains.

Culturally and economically, September and October contain a range of notable events and activities, including holidays, festivals, and annual campaigns that often influence retail cycles and media scheduling. Some organizations use the September–October period for fiscal planning, product launches, or academic term adjustments, while others simply refer to the two months together in logistics and reporting.

Related terms include September, October, autumn (fall), the autumn equinox, and the September–October window as part of a half-year or quarterly planning cycle.