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Madrid-forum threads call September the best month to visit Spain, full stop - the extreme heat is gone but it isn't cold yet, and days run pleasantly in the mid-20s, good for walking the whole day. The caveat is the tail of the month: posters warn late September gets genuinely unpredictable, with the range across a single week running anywhere from 30C down to 8C, so a jacket is worth packing even for an early-month trip. Crowds pick back up too, as the city returns from its own summer break - more crowded than February by every account. The record: 27.1C days feeling like 26C, 16.3C nights, just 29mm total across three days, 10.8 hours of sun and humidity a dry 49 percent.

Regulars are specific that temperatures can jump dramatically within the month itself - mid-to-upper teens Celsius in the first week, 26-28C by the second - rather than settling into one steady spring read. Our row backs the average across that range, 19.5C over 8.9C nights feeling 7C, with 61.4mm of rain across 8.8 days and a real chance of rain on roughly one day in five. Regulars are clear an umbrella is more likely to get used than a winter jacket, with layers and a mid-weight jacket the standard packing choice. The genuine upside of this month is the absence of summer crowds and long lines, a real trade for the changeable weather. The record: humidity 61 percent, 10.8 hours of sun, a 14.6 kph wind and AQI 42.

Regulars call this a genuinely good month to visit - summer's heat and crowds both gone - while being upfront that it's also one of the city's rainier months, so a small foldable umbrella is standard advice rather than an afterthought. Our row backs both halves of that read, 21.1C reading as 19C over 12.3C nights, with a real 62.7mm of rain across 6.9 days. Regulars describe most days as still landing on the sunny side despite the total, with cooler mornings and evenings than the pleasant low-to-mid-20s afternoon suggests on its own. The record: humidity 62 percent, 8.6 hours of sun, a 12.7 kph wind and AQI 43.

Regulars make one distinction about June here and it is the important one: this is dry heat. You are not sweating all day the way you would in Barcelona or Valencia at the same temperature, and our columns show why - 41 percent humidity and a dew point of 8.6C under a 30.3C afternoon, which is why it reads as 29C rather than more. Early June is not yet the peak; the end of the month is properly hot without being mid-July. Their working rule is the clock, not the month: three to five in the afternoon is the worst of it, and that is museum time, the Prado and the Reina Sofia among them. Rain is rare at 19.3mm across 3.2 days. The record: 17.5C nights, 13.2 hours of sun and AQI 51.

Madrid forum threads describe January temperatures typically hovering around 5C, with posters emphasizing the mix of both rainy days and cold, crisp, sunny days rather than one dominant pattern - mornings and evenings run particularly cold even on the clear days. Real snow was described as rare in the city itself, mostly confined to the surrounding mountains, though posters mentioned a once-in-fifty-years storm a couple of winters back as a genuine outlier. The consistent takeaway: January is cold but manageable with warm layers, and the thinner winter crowds compared to spring and summer were repeatedly cited as a real upside for anyone willing to pack for the chill.