Weather in Cagliari in January

A good month. January is a solid month to be in Cagliari. Highs sit at 14.1 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

January ranks 11 of 12 — near the bottom of Cagliari's year. June is the month that works, and the swing between the two is 33 points, which is a different holiday rather than a slightly better one. Worth keeping in perspective: January is the weakest month of Cagliari's year and it is still a perfectly good one. The downside here is small.

Rain on 10 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 14.1 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 2.8 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest January day reached 17.8 °C and the coldest night fell to 5.9 °C, and the wettest single day dropped 28 mm — roughly 54% of the month's rain in one day.

January is moderately variable: 20 mm in the driest year against 116 mm in the wettest, around an average of 52 mm. Roughly two Januarys in three land near that average, and the third does something else entirely.

Wind sits around 18.5 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 78%, which at 14.1 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How January sits in the year

Temperatures hold steady either side: 15.4 °C in December, 14.1 here, 13.8 in February. Nothing about the timing within the month matters much.

Daylight in January

January sits at the dark end of Cagliari's year — 9.7 hours of daylight against 14.9 at midsummer, gaining 0.7 hours across the month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

Sea temperature

The sea sits at about 14.7 °C in January — cold — a quick dip rather than a swim, and a wetsuit if you are in for longer. The sea peaks at 25.7 °C in August and bottoms out at 14.1 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

January in Cagliari versus nearby

If Cagliari is one option among several, the nearby comparison is worth making. Palermo is close enough to be a coin toss — within a degree on temperature, 3 days more rain. Rome is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: January is a compromise. June is 33 points better and is what Cagliari is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Cagliari

See all twelve months in Cagliari, or where else to go in January.