Lagos (Algarve) weather in December

Portimão's forum describes December as changeable but mild by northern European standards - typical days around 17C, occasionally reaching 20C, dropping to 8-10C overnight. Rain shows up regularly but posters were clear it's not an all-day, every-day thing, and the prevailing northerly wind is the bigger factor in how cold a day actually feels. For a rainy day, several people pointed to Portimão's indoor shopping malls, while clear days are good for trips inland to Silves, Monchique or the Foia mountain. Most cafes and restaurants stay open through the off-season.

Regulars are specific the dry season is well established here by the end of this month, with real rain typically not returning until the end of September, though an earlier shower or two in the first half remains a genuine possibility. Our row backs that mild, genuinely dry read, 23.4C over 15.1C nights feeling 14C, with rain light at 21.5mm across 3.7 days and a real 22.1 kph wind. Regulars are consistent the wind here makes conditions feel cooler than the number alone suggests, especially after dark, a jacket worth having even after a warm, sunny day. Mosquito repellent is a genuinely practical addition to the packing list alongside the usual sun protection. The sea sits at 17.2C. The record: 12.7 hours of sun, humidity 68 percent and AQI 46.

Lagos-forum threads on November weather describe a genuinely mixed month: some days cool and cloudy or wet, others warm enough for a light jacket to come off entirely, with the southern Algarve running noticeably drier and milder than Lisbon or the country's north during the same stretch. What sets Lagos apart from the Algarve's smaller resort towns, per regulars, is that it keeps functioning through the winter - a real year-round local population means cafes and shops stay open, and accommodation prices sit at their lowest. The catch some posters flag: on a genuinely bad-weather day, the town can turn notably windy and quiet after dark. Regulars still call most November days mild enough for a coastal walk or sightseeing. The record: 19.2C days feeling like 18C, 13.2C nights, 47mm across 8.1 days, a 17.1C sea, 78 percent humidity and 8.4 hours of sun.

Lagos-forum threads on September weather describe warm, lovely days undercut by cool, windy evenings - the far-western Algarve is called always windy, which makes the coast feel cooler than the daytime number suggests, and posters recommend a jacket, a wrap and an umbrella even on a sunny-looking day. Precipitation is called unusual through the early part of the month, with the back half more unsettled. The trade-off is worth it by most accounts: good weather, a fair number of tourists but not overwhelming, everything still open with nightlife running. The record: 26.8C days feeling like 27C, 18.1C nights, just 11mm across two days, a 17.6C sea still cool for swimming, and 11.1 hours of sun.

June in Lagos is dry and warm on land and cold in the water, and the forum's explanation is one sentence: this is the Atlantic, not the Mediterranean. The regional sea runs about 18 to 20C in June, and Lagos, Sagres and the west-facing coast sit at the cold end of that, below 20, because water comes up from the Atlantic depths regardless of what the Gulf Stream is doing 30km offshore. Our row says 18.4C. The sea can also be rough here in summer. The air is the opposite story - normally in the 30s, occasionally to 40 in the region - though our row's 25.9C for Lagos itself is tempered by a 23 kph wind. The record: 17.3C nights, 2 precipitation days carrying 6.1mm and 13.1 hours of sun.