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Copenhagen, like the rest of Denmark, has four distinct seasons. The best time to visit is definitely the warm period from early May to late August. Current weather forecasts can be checked at the Danish Meteorological Institute website. Spring, while a bit risky, as no one knows quite when it sets in, can be the best time to visit the city. On the first warm day, usually in early May, Copenhageners come out of hibernation and flock to the city streets, parks, and outdoor cafes in a veritable explosion of life, relieved that the country's dreary and dark winters are finally over. Many locals consider this the high-point of the year. Summers in Copenhagen are usually warm with an average temperature of about 20°C, and the days are long — reaching a peak of 18 hours on 21 June. If the weather becomes too hot, you can use one of the free pools in the cool harbour waters near the centre. Copenhagen's harbour is often considered the world's cleanest urban waterfront.…

Copenhagen forum threads describe January as grey, windy and wet more often than bitterly cold, with typical daytime temperatures cited around +2C and nights closer to -3C, though posters noted real extremes on either side are possible in a given year. Wind direction was flagged as the key variable - air from the south or west tends to bring milder, wetter conditions, while a north or east wind brings the real cold. Posters were consistent that the short, often nonstop-overcast days were the hardest part of the month psychologically, and that snow on the ground is actually less common than people expect, covering only a modest share of January days in a typical year.

May here climbs through the month - regulars give 8 to 22C across it - and their warning is that the city can be lovely and sunny and then windy and cold on the same day. Our row averages 16.7C but reads as 14C, and the reason is a 21.6 kph wind; nights at 9.2C feel like 6C. Rain is moderate at 43.4mm across 9.8 days, and sunshine is generous at 12 hours inside 16.3 of daylight. A proper coat plus something light and waterproof is the packing answer, and since this is a city best seen from a bicycle, the wind matters more than the rain. The sea is still 11.5C. The record: humidity 70 percent and AQI 45.

I have been to Copenhagen in June and it was just so pleasant. Mostly just walked around but did a few museums. When I was there it was first sunny days in awhile and the whole city was out enjoying it. It is a beautiful city

June is the one — 20°C, light until eleven, the harbour baths open and the city on bikes. The wind off the Øresund is constant, so 20°C dresses like 16. July is warmer and busier by a lot.

A Copenhagen-forum thread on summer humidity makes the case that Denmark rarely feels muggy at all: humidity is best judged by dew point, and in this part of northern Europe it stays below 60F, which posters describe as comfortable - even the spell locals called "unusually humid, for Copenhagen" measured 89 percent relative humidity one day and fell back to 49 percent the next. July is the high-summer month people book well ahead for, with 17 to 18 hours of daylight around midsummer and cafés and harbour baths in full swing. The record: 21.9C days, 15.2C nights, 13.5 precipitation days, 11.7 hours of sun and an 18.5C sea.

The harbour baths run from June to September and August sits in the middle of that, which is the local answer to what to do with a warm afternoon: the water in the middle of the city is clean, free to swim in, lifeguarded, and cold in the way regulars describe as not really cold by late August. Our sea column says 17.9C, so judge that for yourself. Air is 21.9C over 15.5C, the mildest nights of the Danish year, with 78.6mm across 12.3 days and a 20.1 kph wind that makes a dry day feel fresher than the number. Islands Brygge is a ten-minute walk from the town hall square. The record: humidity 76 percent, 10.6 hours of sun inside 15 of daylight, and AQI 41.

Regulars name genuinely extreme year-to-year variance rather than a settled range - one September ran as warm as 30C, another was cold, rainy and windy throughout, with wind chill capable of dragging the real feel down to 10C by day and 2-3C at night. Our row backs the mild average sitting between those extremes, 18.5C over 13.3C nights, with 65.5mm of rain across 10.1 days and a real 21.7 kph wind. Regulars are consistent that clouds show up most days and a shower is likely, but long stretches of steady rain are rare - a water-resistant, windproof light jacket worn in layers is the standard answer to weather that could go either warm or cold on any given day. The sea sits at 17.7C. The record: humidity 79 percent, 8.3 hours of sun and AQI 42.

Copenhagen forum regulars keep the December weather claim modest: “typically 0-5°C,” generally cold around freezing, with rain and wind more of a constant than snow — a white Christmas has landed only 9 times since 1900, and when snow does fall it tends to melt quickly rather than stick. Daylight is the bigger practical constraint, only around 7 hours of sun this time of year. None of that dims the appeal regulars describe: Tivoli and Nyhavn are called out as especially beautiful under the season's Christmas-market decoration, and the standard packing advice is simply “what you'd wear in London” — umbrella, coat, ordinary winter layers, nothing more extreme. Our record: 4.5°C days, 1.6°C nights, 5.4cm of snow and 1.7 hours of sun a day — cold and dim, matching the “cold but rarely snowy” read closely.