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Istanbul in September reads well on the forum: cooler than August, pleasant and mostly sunny, with maximums around 25–27°C through the middle of the month and only about five wet days across it. Late September turns cooler and can bring rain, so the standing advice is layers, a light jacket for the evening and an umbrella held in reserve. The one thing September does not deliver is quiet — it is still high season, and regulars point out that Istanbul is busy essentially year-round.

Forum posters cite last-week-of-November temperatures around 12C by day and 5C at night in Bursa, with semi-cloudy, sometimes sunny conditions, and describe the weather generally as unstable and cold enough to warrant real warm layers and a jacket. Posters are direct that any rain in Bursa itself likely means snow up at nearby Uludağ, with snowfall in the city proper typically not arriving until closer to year's end. Posters consistently recommend Bursa's mosques and Ottoman-era sultan tombs as worthwhile sightseeing regardless of the cool, changeable weather, given its history as an early Ottoman capital. Posters generally rate November as a cool, unpredictable but genuinely worthwhile time to visit Bursa, with the funicular up Uludağ a real winter-scenery bonus for anyone visiting later in the month.

Forum posters name May (alongside September-October) among the best times to visit Turkey broadly - pleasant spring temperatures for sightseeing, ahead of summer's intense heat, and notably drier than April's showery pattern, with only occasional light, scattered rain by comparison. Layering is the standard advice given how much climate varies by region and elevation across the country. Bursa specifically is called an easy day trip from Istanbul - ferry to Yalova then bus, or a direct ferry from Kabataş to Mudanya - with the historic Silk Bazaar named as the highlight most posters build a visit around.