March and April
Go nowWarm days, cool nights, and the desert at its best
The ideal window: comfortable enough to walk the Strip at midday, cool enough at night for a jacket, and exactly the season to drive out to the canyons. Pools are opening. Prices are high because everyone else has worked this out too.
October and November
Go nowThe heat breaks, and the outdoors comes back
The other good stretch, and slightly cheaper than spring. Days are warm, evenings are cool, and the desert is at its most comfortable for walking. The best single window if you want both the city and the landscape around it.
February
Worth it, butMild, cheap midweek, and cold after dark
Pleasant days and genuinely cold nights — the desert loses its heat fast once the sun is down, which surprises people who packed for a hot place. Rooms are cheap on weekdays. Pools are mostly closed.
May
Worth it, butStill good, and heating fast
The first half is comfortable and the second half is a warning. Pools are open and the desert is still walkable in the morning. Plan the outdoor half of the day before eleven and it works.
September
Worth it, butComing down from the peak, and good value
Still hot, noticeably less so each week, and priced below October. The pools are at their best and the canyons are bearable early in the day. A reasonable compromise if the dates are fixed.
December and January
Worth it, butCold nights, cheap rooms, and two expensive weeks
The coolest months, with short days and genuinely cold evenings. Rooms are at their cheapest — except around New Year, which is the single most expensive night of the year here, and in early January, when the year's biggest trade shows fill the city. Check the convention calendar before booking.
June, July and August
Think twiceDesert heat, and the outdoors closes
Regularly above forty degrees, and the pavement radiates it back until late in the evening. The resorts, the shows and the restaurants are unaffected; the canyons, the walking and the daytime pool are not. This is the season where the fourth day out of the city stops being possible, and the room rates fall to reflect it.