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Winter (November until early March) can be cold and there is little sunshine. Snowfall is fairly frequent in most years, and nighttime temperatures of −15°C (5°F) are not uncommon between mid-December and mid-February. The spring months (March and April) see variable conditions, with a rapid increase in the average temperature. The weather in late March and April is often very agreeable during the day and fresh at night. Budapest's long summer - lasting from May until mid-September - is warm or very warm. Budapest has as much summer sunshine as many Mediterranean resorts. Sudden heavy showers also occur, particularly in May and June. The autumn (mid-September until late October) is perhaps the best season for tourists as it has little rain and long sunny days with moderate temperatures. At the end of October the weather often turns abruptly colder.

Budapest forum threads describe January as the coldest month of the year here, typically hovering close to 0C with highs around 5C, and posters were clear that what actually makes it feel harsh is the wind rather than the raw temperature - wind chill isn't reflected in the official number and can make a given day feel considerably worse. Real snow was described as inconsistent, sometimes not sticking around for more than a day when it falls at all, with some posters noting a run of winters with barely any snow accumulation. The upside repeatedly mentioned across threads: noticeably fewer tourists than the rest of the year, with plenty still open and worth doing if you dress warmly in real layers.

Regulars describe April here as capable of all four seasons within the month, with cold snaps under 10C alongside milder spells - our row splits the difference at 18.9C over 8.5C, with 1.5cm still turning up in the snow column and 30.6mm of rain across 5.2 days. The thermal baths are the standing recommendation for a cold or wet day, though the popular ones - Szechenyi and Gellert - draw crowds heavy enough that regulars call them overwhelming unless you arrive right at the 9am opening. One practical seasonal note: Gellert keeps its outdoor pools closed until the 1st of May, so April visitors get the indoor baths only. The record: humidity 65 percent, 10.2 hours of sun, a 16.7 kph wind and AQI 46.

Regulars call May close to ideal here, the later the better, and their packing advice is the honest version of that: it might rain heavily one day and be genuinely hot the next, so bring for both. Our row sits in the middle of that range at 22.7C over 12.6C, with 60mm across 7.6 days - so rain on a quarter of them, and storms rather than drizzle when it comes. Evenings want a light jacket, partly for the 12.6C and partly for the 15.3 kph wind that runs along the river. Daylight is already 15.1 hours with 11 of sun, which is what makes the month feel longer than its temperature. The record: humidity 68 percent, a dew point of 9.8C and AQI 52.

Budapest forum regulars flag June as the rainiest summer month by frequency, but not by duration — showers “rarely...more than 2 hours at once,” and most posters say early June shouldn't meaningfully interfere with sightseeing. Temperature opinion splits more: some call it comfortably warm, others warn Budapest “can get oppressively hot,” with a mid-afternoon high above 30°C “not unusual” and a heat wave “wouldn't be unheard of” even this early in summer. The trade regulars keep naming: tourist season hasn't fully started, so June still gets the shoulder-season crowd levels with near-peak-summer heat. Our record: 26.4°C days, 16.4°C nights, 9.4 rain days and 12.6 hours of sun — warm with real rain frequency, though not the multi-hour downpours the “oppressive” framing might suggest.

Regulars are specific that the monthly average obscures real variation: made up mostly of comfortable 23-25C days with a smaller share of genuine 30-35C ones, and late in the month capable of touching 39-40C on the worst days. Our row backs the average across that spread, 30.2C reading as a real 31C, over 19.1C nights, with 50mm of rain across 6.1 days. Regulars specifically warn that hotel air conditioning isn't a given here the way it might be elsewhere, so checking in advance is worth doing, and the standard heat-day strategy is hopping between air-conditioned attractions rather than walking outdoor routes for long stretches. The record: humidity 61 percent, 12.6 hours of sun, a 15.1 kph wind and AQI 53.

September in Budapest starts as summer and ends as autumn - regulars describe 30C in the first week and 15C in the last, with the change often arriving abruptly around the middle. It is also the least crowded of the months people actually want: numbers drop off, and although locals are back from the Balaton, early-September reports have St Stephen's, the Castle District and the spas on weekdays all comfortable. The outdoor pools at Szechenyi still work in this month if you time it, and you can simply turn up at the baths - weekends are the busy part. The record: 24.7C days, 14.5C nights, 5.7 precipitation days carrying 49.2mm and 9.2 hours of sun.

Budapest's December is, per the forum, the liveliest of the dark winter months — illuminations and Christmas markets from the start, concentrated on the Pest side where the sights, the restaurants and the flat walking are. Expect grey: heavy cloud, some precipitation, days around 5°C and evenings at or below freezing, with snow possible but never dependable. The detail regulars actually supply is what stays open over Christmas itself, when most ticketed attractions shut for three days — the thermal baths (Széchenyi and Gellért for bathing outdoors in the steam) and the ice rink behind Heroes' Square, with the markets running shorter hours on the 24th and 25th.