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Regulars call this among the two best months of the year climate-wise, genuinely dry with warm days in the 20s and 30s Celsius, the cold season already fading while the real heat of April and May stays comfortably off. Our row backs that warm, genuinely dry read, 30.5C reading as a hot 30C, over 10.8C nights, with rain essentially absent, 3mm across just half a day on average, and humidity down to 58 percent. Regulars are consistent nights and early mornings still turn cool enough for a light jacket even as daytime highs climb into t-shirt-and-shorts territory. This remains a genuinely comfortable stretch for exploring the city and nearby ruins without either winter's chill or summer's heat. The record: 10.6 hours of sun, a 12.8 kph wind and AQI 34.

Oaxaca-forum threads on October weather describe the rainy season as clearly winding down by this point, early-month days still carrying some risk of a tropical system but the back half of October repeatedly called a genuinely safe, pleasant bet weather-wise. Posters describe a comfortable daily pattern - warm, sunny days settling into a noticeably cooler evening once the sun drops, cardigan-and-jacket territory after dark even though the afternoon felt like shorts weather. Regulars call late October, right before Dia de Muertos, one of the best windows of the whole year, the landscape still green from the rains but the sky reliably clear. The standing advice for anyone arriving in the first week or two is to keep a light rain layer handy just in case, less necessary by the back half. The record: 28.3C days feeling like 30C, 14C nights, a clean 29 AQI and 9.3 hours of sun.

Oaxaca-forum threads on July weather describe warm days in the low-to-mid 30s Celsius and cooler nights, part of the rainy season that began the previous month, but posters are consistent the humidity here stays well short of what the Oaxacan coast delivers the same time of year - the city's higher elevation keeps the air noticeably more comfortable. The standing pattern regulars describe is periodic rain that typically starts toward the end of the day and clears again overnight, rarely a factor during daytime sightseeing. Thunderstorms tend to build around sunset, and while an occasional one arrives earlier and catches visitors off guard, posters say it usually passes within a few hours rather than washing out the whole day. Regulars call July a genuinely comfortable month for exploring the city's markets and colonial center. The record: 29.4C days feeling like a sticky 31C, 15.1C nights, 95mm across 14.1 days, 76 percent humidity and 10.3 hours of sun.

January in Oaxaca is dry-season perfection with a cold edge after dark. Regulars give daytime highs in the high 70s to low 80s Fahrenheit and nights in the 50s, dipping towards the high 30s earlier in the month - our row's 28.7C day over a 9.8C night is that gap, one of the widest in this whole round, and it comes from altitude rather than season. Their dress code follows exactly: short sleeves and something light by day, long sleeves with a shawl or a light jacket in the evening, and a sweater on the colder nights. The dry season means clear, sunny days throughout - our row records 3.2mm across 0.9 days. The record: humidity 62 percent, 10.1 hours of sun and AQI 32.