Weather in Denver in June

A good month. June works. It is not the peak, but nothing about it fights you. Highs average 31.2 °C, lows 13.8 °C, and rain falls on 9 days — nothing in the month is working against you.

June ranks 7 of 12 in Denver: past the worst of the year but short of October, 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 31.2 °C days and 13.8 °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 days clear 35 °C, so a serious heatwave is normal rather than notable; the day swings 17.4 °C from low to high, which means one bag has to cover both. Across the twenty years measured, the hottest June day reached 40.1 °C and the coldest night fell to 3.7 °C.

June is moderately variable: 13 mm in the driest year against 90 mm in the wettest, around an average of 42 mm. Roughly two Junes in three land near that average, and the third does something else entirely.

Wind is light at 8.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 41%.

How June sits in the year

The month is on the way up: 7.5 °C warmer than May, and July adds another 2.2 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short. Rain is the thing that moves: July brings 5 days more of it, so the earlier half of a flexible trip is the safer half.

Daylight in June

June is at or near the longest days of Denver's year: 15 hours of daylight, holding steady all 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 — 37 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage. At 1609 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. Within June itself the daily swing is 17.4 °C, so mornings and afternoons need different clothes.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

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

June in Denver versus nearby

If Denver is one option among several, the nearby comparison is worth making. Aspen is a better bet in June — 7.9 °C cooler, 4 days less rain. Moab is close enough to be a coin toss — 2.9 °C warmer, 7 days less rain.

So: June is a compromise. October is 24 points better and is what Denver 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 Denver

See all twelve months in Denver, or where else to go in June.