It's a bit unpredictable around this time of year. Today, for instance, it's around 22C, slightly cloudy, and very pleasant (in my view). The forecast is for around 25C and sunny in the next ten days. But occasionally there's a heatwave. Last week we had one day when the temps soared to 33C, and this time last year there were three or four days in early May when it was over 30C.
The good thing is that it's not humid in May - so even if it does get as hot as July, it won't feel so hot, because it's dryer. And it will be significantly cooler at night - usually around 12-20C at most during May.
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This content was originally posted on Y! Answers, a Q&A website that shut down in 2021.