Tomorrowland weather: what July in Boom is usually like

What is the weather usually like at Tomorrowland?

July in Boom is usually mild and changeable: warm afternoons, cool nights and rain on roughly half the days. The figures below are KMI’s climate normals for July 1991-2020. KMI is Belgium’s Royal Meteorological Institute, and its station in Uccle is about 27 km from the festival in Boom.

These are normals, meaning averages over 30 years. A single year can look completely different, as the last two festival years show.

The weather in 2025 and 2026

Two years in a row brought two very different Julys:

July 2026 was dry and warm. The hottest day was 29 July at 34.4 °C, a few days after the festival. Sunday 26 July, the last day of Weekend 2, was one of the few wet days with 8.4 mm. The 2026 average temperature was 2.2 degrees above normal. July 2025 was closer to normal, with rain on 14 days and an average temperature 0.7 degrees above normal.

The conclusion is simple: pack for both sun and rain, whatever the long-range forecast says.

Does it rain a lot at Tomorrowland?

It depends on the year. In a normal July it rains on 14.3 days out of 31, so a three-day festival weekend has a good chance of at least one shower. 2026 was the exception, with only three rainy days all month.

Rain mostly affects how comfortable your weekend is:

• Grass gets wet and can turn muddy when many people walk on it, both on the festival site and in DreamVille.
• Your tent must handle rain. Easy Tent and the other ready-made tents in DreamVille are set up for you, but your own tent in Magnificent Greens needs to be waterproof.
• Your phone will thank you for a small waterproof pouch, especially if you use it to find friends and check set times.

What to wear at Tomorrowland if it rains

Layers work best, because a day can go from 23 °C and sunshine to rain and cool evenings. A few tips:

1. A rain jacket or poncho that folds away and can be carried all day. There is no same-day re-entry if you leave the site to fetch clothes.
2. Shoes that can handle wet ground. Comfortable shoes you have already worn in matter more than stylish ones, and spare socks make a big difference.
3. A thin sweater for the evening. The festival is open until 01:00 on Friday and Saturday, and nights average 14 °C.
4. An outfit that copes with the weather. Ideas for clothes that work in sun and rain are in Tomorrowland outfits.

What if it gets hot?

In a normal July two days reach 30 °C or more, and 2026 showed it can go above 34 °C. What helps:

• Sunscreen: Tomorrowland hands out free sunscreen and earplugs through its We Care A Lot programme. Aerosols are banned on the festival site, so leave spray sunscreen at home. The full list of banned items is in Tomorrowland rules.
• A cap or hat and sunglasses.
• Drinks: you cannot bring your own drinks onto the festival site, so plan to pay for drinks with Pearls. In DreamVille you may bring unlimited water.
• Medical help: first aid and doctors are on site during all opening hours if anyone suffers in the heat.

Is Belgium cold in summer?

No, but evenings can be cool. The average July temperature is 18.7 °C according to KMI, with an average high of 23.2 °C and an average night low of 14.1 °C. That is a gap of about nine degrees between afternoon and night, which you notice when standing still at a stage after midnight or walking back to your tent at 01:00.

Packing for the weather: quick guide

Weather and camping in DreamVille

When you camp, you feel the weather more. DreamVille is open from Thursday to Monday, so you spend four nights outdoors. Keep in mind:

• Sleeping bag and mat for nights about 14 °C. Easy Tent includes sleeping bags and a double mattress.
• Showers: the outdoor shower is free, but an indoor hot shower costs extra, except in Montagoe.
• Dry storage: keep one bag for wet clothes and one for dry ones.

More advice on tents, showers and sleep is in our DreamVille camping tips.

How to check the forecast

A long-range forecast for July tells you little in January, when you buy your ticket. Check the forecast for Boom a few days before you leave instead, for example from KMI or the weather app you already use. Then pack for the worst case in the forecast, not the best.

Packing tips for Scandinavian visitors

• Keep your rain jacket in your hand luggage if you fly, so you have it as soon as you land.
• Same time zone: Belgium shares its clock with Scandinavia, so the hourly forecast for Boom needs no conversion when you plan the day.
• The full packing list with clothes, camping gear and documents is on our packing list.