The Sultans Trail from Sofia to Istanbul generally experiences mild to warm temperatures in September, with average highs ranging from the mid-teens to the upper twenties (°C) and lows typically in the low teens. As a pilgrim traveling through Bulgaria, you'll encounter a mix of sunny and partly cloudy days, with occasional rain, particularly in the form of patchy showers. The precipitation levels vary across different areas, with some regions experiencing moderate rain more regularly than others.
As you cross from Bulgaria into Turkey, expect similar temperature ranges, but with slightly increased chances of rain, particularly in the form of patchy rain and occasional moderate or heavy showers. The Turkish portion of the route also offers a mix of sunny and partly cloudy days with variable levels of precipitation. The overall climate is consistent with a gradual shift from late summer to early autumn, offering a generally pleasant travel experience with only occasional bouts of more significant rainfall.
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