Joshua Tree National Park (Joshua Tree) — sää kuukausittain

Days are typically clear with less than 25 percent humidity. Temperatures are most comfortable in the spring and fall, with an average high/low of 85 and 50°F (29 and 10°C) respectively. Winter brings cooler days, typically around 60°F (15°C), and freezing nights. It occasionally snows at higher elevations. Summers are hot, over 100°F (38°C) during the day and not cooling much below 75°F (24°C) until the early hours of the morning.

Joshua Tree-forum threads on a January visit describe daytime temperatures as genuinely comfortable in the sixties Fahrenheit, posters naming nights in the thirties as the real cold part of the day. Regulars call even a sunny seventy-two-degree afternoon genuinely deceptive, several posters warning it can feel cold the moment you step into shade. Posters call crowds genuinely thin in January, several regulars naming New Year's week as the one real exception to otherwise quiet trails. Regulars call January genuinely one of the coldest months here despite still feeling pleasant thanks to reliable sun, several threads naming layers, a warm hat, gloves and a fleece as standard packing. Posters recommend preparing for the rare chance of a light dusting late in the month, several regulars calling this a real possibility even if uncommon. The record: 16.2C days, 4.6C nights, 18.8mm across over 3 days and 46 percent humidity.

Joshua Tree-forum threads on a February visit call this a genuinely cool, crisp window, posters describing conditions as cold enough at the end of January into February that an inch of accumulation isn't out of the question. Regulars call real layers worth packing regardless of the forecast, days here capable of warming up considerably once the sun is fully out. Posters call February a real sweet spot before the wildflower crowds of March and April, considerably quieter than the park's busiest stretch. Regulars recommend avoiding the MLK weekend specifically, crowds there noted as a real exception to the otherwise quieter month. Posters recommend bringing food and water into the park regardless of trip length, no services available once inside. Regulars call the Arch, Heart Rock, Skull Rock and Jumbo Rocks all solid February picks, easy hikes well suited to shorter winter daylight. The record: 18.2C days feeling like 18C, 5.4C nights, 13.3mm across over 2 days and 39 percent humidity.

March is wildflower season and, for exactly that reason, one of Joshua Tree's two busiest months — the forum warns the queue at the Joshua Tree entrance can run an hour or more and suggests entering at Twentynine Palms instead, looping east to west and exiting the other side. Blooms follow the winter's rainfall rather than the calendar: in a good year some start in February and most are finished by mid-April, with March and April the dependable middle. On weather, regulars flag how much the month moves — early March often sits in the mid-teens °C and feels cool, while by mid-month it can reach the mid-20s. Nights stay cold either way, near 8°C.

Joshua Tree-forum threads on May weather are direct that this is already a genuinely hot month, daytime highs commonly climbing into the 90s Fahrenheit and occasionally touching 100 by month's end, a real step up from the milder spring months earlier in the year. Posters call the park almost always breezy regardless of the exact temperature, layers recommended less for cold and more because the desert wind can make an otherwise warm afternoon feel noticeably different in exposed spots. Wildflower bloom is called largely finished by May in a typical year, though posters recommend checking a current bloom report rather than assuming based on the calendar alone, since timing shifts with how much moisture the prior winter carried. Regulars recommend an early start for any real hiking, saving the middle of the day for driving between viewpoints or indoor stops in nearby towns. The record: 30.5C days feeling like 29C, 15.1C nights, a low 31 percent humidity and 12.9 hours of sun.

Joshua Tree-forum threads on a summer visit call July genuinely hot but note the park runs a real ten degrees Fahrenheit cooler than nearby Palm Springs, the elevation doing real work. Regulars describe day-to-day swings as considerable, some days sitting in the high eighties with a breeze while others climb well past a hundred and ten. Posters recommend hiking only in the early morning before the real heat builds, afternoons better spent somewhere with shade or air conditioning. Regulars call carrying far more water than feels necessary standing advice, dehydration a genuine risk even on a short walk. Posters describe the desert as still worth the visit despite the heat, sunrise and sunset both considerably more comfortable windows for exploring. Regulars recommend checking a real-time forecast rather than a general seasonal average before any longer outing. The record: 39.1C days feeling like 39C, 24.5C nights, a scant 0.5 days of measurable precipitation and 26 percent humidity.

Forum posters generally plan on daytime highs around 90F in September, though a heat wave can push conditions to 100F or more, with nights cooling to a comfortable 65F. Posters note the park's northern reaches near Twentynine Palms sit at higher elevation and run noticeably cooler than the lower desert (about 10F cooler than nearby Palm Springs), which matters when picking which trails to tackle on a hot day. A near-constant breeze is repeatedly credited with making the heat more bearable, and brief, short-lived thunderstorms are a real possibility this time of year. Standard ranger advice for September hiking: start at sunrise and be done by mid-morning, and bring significantly more water and electrolyte drinks than instinct suggests.

Joshua Tree-forum threads on October conditions describe early-month days as still genuinely intense, afternoon highs commonly near the mid-nineties Fahrenheit before easing off as the month progresses, closer to the low eighties by early November. Posters call mid-October a real sweet spot, sunny and noticeably more comfortable than midsummer while crowds are still manageable ahead of the winter rush. Regulars describe a consistent breeze as a genuine feature of the park, taking the edge off the desert sun through most of a typical day. Posters recommend real water and sun protection regardless of how mild the month feels, dry desert air here deceptively easy to underestimate. Regulars call early morning the best window for serious hiking, the rock formations and Joshua trees worth the trip. Posters recommend layering for a genuinely cool evening after a warm day. The record: 28.4C days feeling like 26C, 14.2C nights, a low 28 percent humidity and 10.4 hours of sun.

November is high season here, and the forum's warnings are about dates and nights rather than heat. Afternoons sit around the low 70s F, dropping towards the 60s late in the month, and once the sun goes the temperature falls like a rock - nights near 50F and sometimes under 40, often windy with it, so layers plus a scarf and gloves for the evening. Camping in a tent is comfortable enough with that. The dates to avoid: Veterans Day weekend, and above all Thanksgiving, the busiest stretch of the park's year, when the Joshua Tree entrance queue can run an hour or two and there is no parking to be had. The record: 21.8C days, 8.7C nights, 0.8 precipitation days, humidity 33 percent, 9.1 hours of sun, AQI 35.