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March in Charleston is the month regulars call variable before they call it good: some years it is in the upper 60s and low 70s F by the middle of the month, others it stays cold and wet throughout. What makes the gamble worth taking is the azaleas, which come out mid to late March and peak from the end of the month through the first two or three weeks of April - White Point Gardens and Hampton Park are the names they give. Two warnings travel with it. The garden festival pulls people from well outside the city, so downtown is busier than the tourist calendar suggests, and the tree pollen through March and early April gets described as sand-thick, the price of all the greenery. The record: 19.7C days, 12.7C nights, 5.7 precipitation days carrying 75.2mm, 9.1 hours of sun and a 21 kph wind.

Regulars are specific this month is a real transition, highs falling from near 80F early on to around 70F by the end, with the ocean itself cooling noticeably faster after the second week - early October named as the better window for anyone actually planning to swim. Our row backs that mild, still-pleasant read, 24.6C over 15.3C nights, with 110.9mm of rain across 6.1 days and humidity at 74 percent. Regulars are consistent this counts as genuinely perfect weather for strolling the beach even once swimsuit weather fades, crowds thinning fast and hotel deals improving as the month goes on. The sea sits at 21.8C, still comfortable for many earlier in the month. The record: 8.9 hours of sun, a 17 kph wind and AQI 42.

Regulars put the average air near 76F with water around 68F, both still on the cool side, and warn the month can swing day to day - 75 one afternoon, 55 the next. Our row backs that unsettled read, 22.5C reading as 22C over 12.9C nights, with 87.4mm of rain across 6.6 days and a genuine 20.2 kph wind. The sea sits at 19.5C, manageable for some by late April rather than truly warm, which is why regulars traveling with kids over spring break are pointed toward a hotel with a heated indoor pool as the reliable backup regardless of what the ocean is doing that day. Days are usually clear and sunny even when the water lags behind. The record: humidity 70 percent, 10.7 hours of sun and AQI 51.

Myrtle Beach-forum threads on January weather describe genuinely variable conditions - typical days sitting in the 50s Fahrenheit, but posters note it's entirely possible to catch a run of 70-degree afternoons on the warmest stretches, right alongside a cold snap on other days. Mornings run chilly regardless, but the afternoon warmth is often enough for a comfortable beach walk, outdoor dining, or a round of golf with just a light jacket. The ocean itself is called firmly off-limits for swimming, water temperatures cold enough that even wading isn't appealing. Regulars are consistent that the real trade-off this month isn't the weather but the town itself - a genuine share of restaurants and attractions close for the off-season, so the notably cheaper rates come paired with fewer open options compared to summer. The record: 13.7C days feeling like 12C, 4C nights, 82mm across 8.1 days, 2.4cm of rare snowfall, a 10.9C sea, 72 percent humidity and 7.2 hours of sun.

September is the month locals name alongside May: about 85F air and 77F water on their figures - our row says 28.5C and a 27.2C sea - with the crowds gone the moment Labor Day passes, no queues at the restaurants or the mini-golf, and accommodation prices down with them. The caveat is the calendar it shares with hurricane season, of which September is the peak. Regulars are measured about it: storms more often skirt the South Carolina coast for North Carolina, and one of them counts nine September trips with a single tropical storm that was not severe. Our row's 210mm across 8 precipitation days is the wettest total in this round, and that is what a tropical system looks like in a monthly normal. The record: 20.8C nights, humidity 79 percent and 9.8 hours of sun.