These are the hottest days to book annual leave in 2025, according to weather predictions

Top 10 hottest weekdays in London:

eCommerce marketing specialists NOVOS comment: “Friday 18th July is forecasted to be the hottest weekday in London, being the perfect date to book off for a weekend in the sun. Combine it with Thursday 17 July to enjoy an extra long weekend during one of the warmest periods this summer. Those wanting to enjoy a quieter, midweek day to relax should consider booking Wednesday 23rd July or Tuesday 25th June, which are both expected to bring warm weather reaching highs of 26°C.

August is also set to be a hot month, with average temperatures of around 25°C expected in the first half. Monday 11th August is expected to be the hottest day of the month, so if you choose to book this day off, you can enjoy a long weekend of sunshine.”

Olivia Royce, Operations Director at NOVOS says: “We underestimate how much our environment impacts our performance. A few days in the sun can do wonders for your mental energy… and that energy always finds its way back into your work.

At NOVOS, we design our benefits around that philosophy- including our unlimited holiday policy – whether it’s spontaneous summer Fridays or planning time off around the warmest days of the year, we encourage our team to actually enjoy the flexibility we offer. Sunlight boosts serotonin, and we would always take happy, recharged employees over burnout any day.”

Hottest weekdays in Edinburgh:

The hottest day in Edinburgh to book annual leave is set to be Tuesday 24th June. Moving to mid-to-late July, the temperatures peak around the 19th July weekend. To enjoy the sun during mid-week, consider booking off Wednesday 16th July or Thursday 17th July.

Hottest weekdays in Cardiff:

Cardiff is set to be hot in mid-July, with Friday 18th July offering the best conditions to enjoy the weather. Early August is also promising, with Monday 11th August standing out as one of the warmest days perfect for a sun-soaked start to the week.

Hottest weekdays in Belfast:

Belfast may have milder summer highs, but Tuesday 22nd July stands out as the best day to enjoy a warm day. For a quieter escape during the mid-week, Thursday 17th July and Wednesday 23rd July offer solid sunshine without weekend crowds.

Top 10 hottest days in the UK (average):

Across the UK, the third week of July (17th–19th) looks to be the sweet spot for warm, sunny weather making it ideal for booking annual leave. In August, the first half of the month also brings consistent temperatures in the low 20s, offering sunny days for weekend staycations or outdoor BBQs.