Glastonbury Festival’s fame as a mud festival rests on a mere handful of years. “Mud”, under the site’s rule (40 mm or more across the festival days and the week before), has built up at only 2 editions out of 27, and the median rainfall per edition is just 3 mm: rain here is frequent (37% of festival days), but usually light. This is the weather of past editions and the climate of the usual dates according to the ERA5 reanalysis; forecasts for specific days come from the weather services.
Mud and heat at past editions
The wettest was 2007: on 22–24 June it rained all 3 days, 24 mm in total. There has never been a hot day (a day of 30 °C or more); the closest was 2019 with 29 °C. The coldest night was 7 °C (2000). You will need a raincoat more often than wellies.
What the usual weather means for 2027
Tickets are valid from 23 to 27 June 2027. The site counts the last 3 days of the programme, 25–27 June, which fall exactly on the usual dates. Based on the 1991–2025 climate, they have a 63% chance of at least one rainy day, an average daytime high of 20 °C, and a night below 8 °C happens in 6% of cases. There is no forecast for these days yet.