United States weather

Our guide to the weather in the United States during May


Average high


UV Index


Monthly rainfall



We've looked at the most up-to-date weather data for the United States, covering the last 12 years up to 2023, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about the United States weather in May.

How warm is it in the United States during May?

The temperature reaches around 23℃ during the daytime in May, falling away to 13℃ at night. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.

Does it rain in the United States during May?

May is typically the wettest month in the United States. On average, there will be 9 rainy days during the month, amounting to 203.7mm in total. That's a lot of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. There's a good chance that you'll catch a thunderstorm during your trip.

Is it windy in the United States during May?

You're unlikely to experience any strong winds. Expect a gentle breeze that increases to moderate at times during May. With warm air temperatures and high humidity, any breeze will feel warm but refreshing.

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