コモ 9月の天気

Lake Como's forum rates September as prime season — warm around 25°C with lower humidity than summer, described by one regular as sometimes 'as beautiful as you can dream of, warm but with a crispness in the air.' Regulars flag rain and short-lived storms as still possible, statistically less than summer, and recommend a jacket for early morning and evening on the water.

Regulars are specific this counts as one of the hotter, more humid months here, the lake itself providing some relief compared to inland Italy though genuinely real heat still builds through the day. Our row backs that hot, genuinely wet read, 28.6C reading as a scorching 32C, over 18.9C nights feeling 21C, with a substantial 138.4mm of rain across 10 days and humidity at 71 percent. Regulars are consistent thunderstorms can roll through the surrounding mountains and clear again quickly, comparisons with nearby Lake Garda and Lake Maggiore a common forum topic since conditions can genuinely differ lake to lake on the same day. Late June through September all get debated as the better window depending on crowd tolerance. The record: 12.6 hours of sun, a 10.3 kph wind and AQI 53.

Regulars split this month into three: early August is delightful and not yet crowded, the week around the 15th - Ferragosto, Italy's big summer holiday - is the worst for both heat and crowds, and late August eases back on both fronts. Our row backs the heat throughout, 28.2C reading as a real 32C at 71.7 percent humidity, with 154.7mm of rain across 8.6 days - regulars describe those storms as spectacular electric ones that leave the air refreshed afterward rather than just a nuisance. This is high season everywhere on the lake, and one visitor calls August the worst month to travel in Italy generally, for the combined heat, crowds and prices - though the lake itself stays swimmable and beautiful whichever week you land in. The record: 11.6 hours of sun, a 10 kph wind and AQI 50.

The June forecast here reads worse than the month does, and regulars explain why: it is sunny with isolated thunderstorms rather than grey with rain. The storms are heavy, short, spectacular and usually in the evening, so the days survive them. Our row shows exactly that shape - 149.6mm falling across only 10 days, fifteen millimetres apiece, under 12.4 hours of sun inside 15.7 of daylight. Temperatures push towards 30C on their account and our average high is 26.7C, with 17.2C nights. On crowds they place late June and July at the top of the season, still short of August, with Bellagio and Varenna busiest at weekends and public holidays. The record: humidity 72 percent and a 10.3 kph wind.

April on Lake Como is variable and regulars will not promise more than that: a good chance of rain, genuinely cold early mornings and evenings at the start of the month, and sun that does turn up. Our row's 17.6C day over an 8C night reads as 16C and 6C, and carries 103.2mm across only 9 precipitation days - about eleven millimetres a wet day, so the rain here arrives in quantity rather than as drizzle. The practical dividing line is the season itself, which starts nearer the end of the month around Easter: ferries run a limited winter timetable until a fuller one appears a few days into April. Without a car, Varenna is the base they name, on the train line and well served by boat. The 0.3cm of snow in our row is the mountains above the lake. The record: humidity 69 percent, 10.1 hours of sun and AQI 50.