Weather in Aspen in May

A good month. May works. It is not the peak, but nothing about it fights you. Highs average 15.6 °C, lows 2.2 °C, and rain falls on 9 days — nothing in the month is working against you.

May ranks 5 of 12 in Aspen: past the worst of the year but short of June, which is the month to book if the dates are open.

Rain on 9 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 15.6 °C days and 2.2 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 6 nights fall below freezing. Across the twenty years measured, the hottest May day reached 29.5 °C and the coldest night fell to -8.3 °C.

May is moderately variable: 11 mm in the driest year against 110 mm in the wettest, around an average of 43 mm. Roughly two Mays in three land near that average, and the third does something else entirely.

Wind is light at 2.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 63%.

How May sits in the year

The month is on the way up: 6.6 °C warmer than April, and June adds another 7.7 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in May

May is at or near the longest days of Aspen's year: 14.3 hours of daylight, gaining 0.9 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

An inland climate

With no coast nearby, the year swings a fair way — 39.6 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage. At 2405 m, altitude is doing as much work here as latitude: thinner air means fierce sun by day and heat that leaves the moment it sets.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

May in Aspen versus nearby

If Aspen is one option among several, the nearby comparison is worth making. Denver is a better bet in May — 8.1 °C warmer, 2 days more rain. Moab is a better bet in May — 10.8 °C warmer, 3 days less rain.

So: May is a compromise. June is 22 points better and is what Aspen is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Aspen

See all twelve months in Aspen, or where else to go in May.