What lovely weather today!
'Bel' — BEL. Short, crisp. 'Oggi' — OG-gi, double 'g', stress on the first syllable.
Use as a conversation opener on a sunny or pleasant day. One of the most natural ice-breakers in Italian, usable with anyone — neighbours, shopkeepers, strangers.
'Che' before an adjective expresses exclamation — 'what a...!'. 'Bel' is the elided form of 'bello' before masculine singular nouns. 'Bel tempo' (good weather) is the standard expression. This is the Italian equivalent of the British conversation-starter about weather.
Che bella giornata!
What a beautiful day!
Refers to the whole day rather than just the weather — slightly warmer
Oggi fa proprio bello.
Today the weather is really nice.
'Fare bello' is the idiomatic weather expression — literally 'it makes beautiful'
Una giornata di sole splendida!
A splendid sunny day!
More enthusiastic — suitable for especially beautiful days
Weather is Italy's equivalent of Britain's famous weather small talk. It's used to open conversations with neighbours, at the market, and in lifts. Unlike Britain, where weather talk is sometimes seen as avoiding real conversation, in Italy it's a genuine community connector.