The Natural Calendar: September
What to look for, where, and how sure we are.
Southward turn of the seasons: the September equinox falls around 22 to 23 September, when day and night are close to equal length everywhere. Date certain.
Mara crossings and bears: the Mara River crossings are tapering by late September or October, and Katmai's brown bears return to Brooks Falls to fatten for winter; Fat Bear Week is run each autumn, with dates announced annually. Predictable season; dates vary.
The monsoon withdraws from India: rains ease through September in much of north India, and parks such as Kaziranga and Madhya Pradesh's tiger reserves reopen from about October; confirm dates each year. Predictable pattern; exact dates vary.
Rainy season in Cambodia: Angkor is green and quiet in September; showers can be heavy. Predictable season.
Prices, dates, permits and rules change — approximate, verify before you travel. Researched from public sources; field verification pending.
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