Weather in Aspen in August

Prime time. If you get to pick your dates, August is the one. Highs average 25.1 °C, lows 10.1 °C, and rain falls on 13 days — nothing in the month is working against you.

August ranks 4 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 13 days, 0 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest August day reached 31.6 °C and the coldest night fell to 2.2 °C, and the wettest single day dropped 33 mm — roughly 73% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 68 mm against 16 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 45 mm average is a reasonable planning figure, not a promise.

Wind is light at 1.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 58%.

How August sits in the year

The month is on the way down: 1.8 °C cooler than July, with September dropping another 4.1 °C. The first week and the last are not the same trip.

Daylight in August

13.8 hours of daylight, losing 1.1 hours across the month. That is between Aspen's extremes of 14.9 and 9.4 hours, so days are long enough not to constrain the plan.

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. Within August itself the daily swing is 14.9 °C, so mornings and afternoons need different clothes.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

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

August in Aspen versus nearby

If Aspen is one option among several, the nearby comparison is worth making. Denver is the weaker option in August — 6.7 °C warmer, the same number of rain days. Moab is the weaker option in August — 9.6 °C warmer, 5 days less rain.

So: August works, with June the better month by 13 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Aspen

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