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Barcelona forum regulars are clear that March means city weather, not beach weather: daytime readings run “7 to 15°C,” “sunny, mild and very pleasant during the day, slightly cooler at night,” with some weeks reaching highs of 16-17°C and plenty of sun. The sea itself rules out swimming for anyone but the very determined — one poster recorded a surface reading of 13.6°C, calling it swimmable “for the VERY brave” only. Layering is the standard advice, since many shops and restaurants run warm indoors even on a cool day outside. The upside: sights aren't packed with tourists yet. Our record: 15.8°C days, 8.4°C nights, 7.2 rain days and a 14°C sea — mild and mostly dry, with a sea that backs the “brave swimmers only” framing.

Regulars are specific daytime temperatures here commonly land in the teens, occasionally reaching 20C, evenings and nights turning genuinely chilly by contrast, warm enough for a t-shirt in the sun but not for a tan or a swim. Our row backs that mild, genuinely wet read, 20.7C over 5.8C nights feeling 4C, with a substantial 87.2mm of rain across 6.6 days and a trace of very early snow, 0.1cm. Regulars are consistent this remains a genuinely great month for walking, especially inland into hilly, wooded areas as the trees come back into bud, showers a real possibility to plan around regardless. The sea sits at a cool 15.2C. The record: 10.5 hours of sun, a 14.3 kph wind and AQI 39.

Regulars call this month warm and sunny without July and August's overbearing heat, and specifically recommend it for beating the crowds while the water is already swimmable. Our row backs the warmth, 30C reading as a real 32C over 14.4C nights, with 55.3mm of rain across 5 days including the odd thunderstorm. The calendar shifts things on the 24th: Catalan schools break up for Sant Joan, second-home owners arrive for the festival, and the crowd genuinely picks up from that date, though regulars are clear the real peak does not land until mid-July. The sea sits at 21.7C. The record: humidity 69 percent, 12.8 hours of sun, an 11.9 kph wind and AQI 48.

Girona-forum threads on July weather agree this is peak summer heat, days regularly pushing into the mid-30s Celsius, though posters flag hiking inland as noticeably harder going than a coastal day, since Girona city itself lacks the sea breeze that softens the Costa Brava beaches nearby. By early July the roads and beaches are already filling in fast, so the quieter, cooler shoulder months of late spring and early autumn get repeated mentions as the more comfortable pick. Regulars note that many residents actually leave the city for their second homes on the coast come August, an interesting contrast to July when the city itself still runs busy. The sea along the Costa Brava is called acceptable for swimming though a touch cooler than a fully tropical destination, refreshing rather than warm-bath temperature. The record: a scorching 32.6C by day feeling like 35C, 16.5C nights, just 45mm across 3.6 days, a 25.4C sea, 66 percent humidity and 13.1 hours of sun.

September in Girona is warm by day, cooler in the evening and, by late in the month, close to ideal - mid-20s with far less rain than the summer, which our row puts at 28.1C over 13.5C with 6 precipitation days. The point regulars make that no climate row could is about the city rather than the sky: Girona is inland, so it half closes through August while everyone is at the coast, and comes back to life in September with the bars and restaurants open and busy again. That makes it the most sociable month of the year here, and it arrives just as the summer visitors leave. The record: feels-like 30C, 70.1mm of rain, humidity 75 percent, 10.2 hours of sun and AQI 37.