ラグナ・ビーチ 9月の天気

September, not August, is southern California's warmest month, and the first half of it is the warmest part - which is the single most useful thing this forum tells visitors, because the summer crowds have gone back to school by then and the beaches are quiet with it. The ocean follows the same curve: the warmer currents peak around 72F in early to mid September, about as warm as this coast ever gets, and our row puts the sea at 21C. The month is effectively rainless - 0.5 precipitation days carrying 3mm. The record: 23.7C days that feel like 26C, 18.4C nights, 11.1 hours of sun and a 15 kph breeze.

Regulars are specific June Gloom, the marine layer of low cloud and fog, is a genuine daily feature here that typically clears by around noon into a sunny afternoon, though some years stay cloudy for much longer stretches than usual. Our row backs that mild, genuinely dry read, 20.6C over 16.5C nights, with rain essentially absent, 0.8mm across half a day, and humidity at 74 percent. Regulars are consistent the sand itself runs noticeably cooler than areas even half a mile inland thanks to the steady ocean breeze, May actually rated as having better beach weather than this month, with July and August the genuinely reliable warm stretch. The sea sits at a cool 17.8C. The record: 12.9 hours of sun, a 14 kph wind and AQI 46.

Laguna Beach-forum threads on December weather describe a genuine range: some visitors catch a beautiful early-month stretch good enough for the beach, while a winter storm rolling through can mean rain for the better part of a week instead. The standing daily rhythm regulars describe is morning and evening marine fog burning off into afternoon sun, a pattern that holds even on an otherwise middling day. Inland temperatures can run a good ten degrees warmer than right on the sand, worth knowing for anyone splitting time between the coast and Orange County further in. The advice across every thread is the same: layer up, since a warm, sunny afternoon can still turn into a genuinely cool evening requiring a proper jacket. Regulars call December a smart trade-off overall - thinner crowds than summer, in exchange for real weather variability. The record: 18C days feeling like 16C, 11C nights, 43mm across 4.1 days, a 16.3C sea, 75 percent humidity and 7.9 hours of sun.

Laguna Beach-forum threads on October weather call it just about perfect: dry, fog-free, not really warm and not cold, sunny days in the 70s Fahrenheit dropping to the upper 50s at night. The standard advice is layering for the day-to-evening swing - shorts and a t-shirt through the afternoon, a light jacket or sweater once the sun goes down - with the end of the month running cooler, windier and drier still, enough that posters specifically recommend extra lotion for dry skin. Being coastal keeps Laguna a touch cooler than inland Orange County the whole month. The record: 23.5C days feeling like 26C, 19C nights, essentially none at all, a 21.1C sea, 74 percent humidity and 12.1 hours of sun - close to the mild, reliable month the forum describes.

July is where Laguna Beach comes out of the gloom. June Gloom is the local name for the marine layer that forms when warming inland air pulls cool ocean air against the hills, and it can hang over the coast into early July; regulars say the cloud thins out noticeably right around the Fourth, and that later July is reliably warm. When it does turn up it usually burns off around midday. The catchy phrase oversells it - not every May or June day is grey - but July and August are the months they name for weather. Our row's 22.4C reads as 26C with the sun out, over an 18.5C night. The record: 0.5 precipitation days, 13 hours of sun, humidity 73 percent and a 20.1C sea.