Contrasting with

Grammar: Comparison and Contrast

が connects two contrasting clauses, similar to “but” or “even though” in English.

Sometimes, が is used simply to connect clauses without contrast.

Examples

Even though it's still chilly with 〜が〜

Manga panel from ARIA The MASTERPIECE showing example of Even though it's still chilly with 〜が〜.
ARIA The MASTERPIECE » Volume 7 » Page 4

Akari narrates about her group’s change from winter uniforms to summer uniforms.

灯里(あかり):
「まだちょっぴり肌寒(はだざむ)いですが私(わたし)たちは今日(きょう)から衣替(ころもが)えをしました」
“It is still a little chilly, but we changed our uniforms today.”