SpringMarch - May
Kelvingrove Park and the Botanic Gardens come into leaf, and the Glasgow International Comedy Festival fills venues across the city in March.
Spring is a good, uncrowded time to be in Glasgow. Kelvingrove Park's cherry blossom and the Botanic Gardens' glasshouses are at their best from April, the Kelvin Walkway dries out after winter mud, and the Glasgow International Comedy Festival runs a full three-week programme across the city's theatres and clubs each March. Days lengthen fast this far north and by late April there is useable evening light past eight o'clock. The West End's café terraces on Ashton Lane and Byres Road start filling on the first mild weekends, and hotel prices stay reasonable outside any specific event weekend.
SummerJune - August
WestFest fills the West End with events through June, and long daylight (light past ten some evenings) makes it the easiest season for walking the parks and the Kelvin.
June brings WestFest, the West End's month-long community arts festival with roughly 300 events across more than sixty venues, from Shakespeare in the Botanics to grassroots gigs at the university. Daylight this far north runs late, past ten o'clock some evenings around midsummer, which makes long park walks and an evening on Ashton Lane's terraces genuinely comfortable. Expect showers regardless of the season, since Glasgow's west-coast climate does not really do a dry season, but summer is when the Botanic Gardens and Kelvingrove Park earn their keep. Hotel prices rise around any major concert or festival date at the SEC or Hampden; check the calendar before booking a summer weekend.
AutumnSeptember - November
The Merchant City Festival runs across two late-July and early-August weekends, and September brings the King Tut's and Barrowland gig calendar back into full swing after the summer festival circuit.
Early autumn in Glasgow is when the indoor city comes back into its own: the Kelvingrove and the Gallery of Modern Art are at their best on a wet afternoon, the Necropolis and Cathedral are quieter than in summer, and the King Tut's and Barrowland gig listings fill back up as touring bands come off the festival circuit. The Merchant City Festival's two weekends of street performance, circus and family programming usually land in late July and early August, right at the edge of this window. Days shorten quickly, sunset before five by late October, so plan outdoor stretches like the Kelvin Walkway for the earlier part of the day.
WinterDecember - February
Celtic Connections takes over eighteen venues across the city for the second half of January, the single best reason to visit Glasgow in winter.
Winter belongs to Celtic Connections, the folk, roots and world music festival that runs across the back half of January in venues from the Glasgow Royal Concert Hall to the Barrowland and King Tut's, one of the best midwinter music festivals anywhere in Britain and worth building a trip around on its own. Outside the festival, this is when Glasgow's indoor culture, the Kelvingrove, the Cathedral, GoMA, the tea room at Mackintosh at the Willow, matters most: short days (sunset mid-afternoon around the solstice) and regular rain make museum-hopping and long lunches the sensible plan. Pack for wet, windy weather rather than deep cold; Glasgow's winters are milder than the UK's east coast but wetter.