There are 16 coffee shops in Mengwi, and the median rating is 4.8. 13 clear 4.7. At that density the rating stops separating them and you are choosing on everything else. That is above the island-wide median of 4.7.
This is a cheap corner of the island: 7 start under Rp 50K, and none sit at the expensive end. The ratings do not suffer for it. The median band starts around Rp 50K.
This is a morning place: 9 open by 7am. 5 are still open at 10pm, which in Bali counts as late. The typical closing time is 8pm.
The busiest by a distance is openhouse cafe | Seseh, with 468 reviews. At the other end are the ones almost nobody has reviewed and everybody rates: Flatto, Tarisa Café, de'TOPAZ Cafe Seseh. Google will not show you these, because it ranks by confidence and confidence needs volume — which is the entire reason this guide exists.
Good to know
How good are the coffee shops in Mengwi?
The median rating is 4.8 on Google, and 13 of the 16 sit at 4.7 or higher.
When do they open?
Typically around 7am, closing about 8pm. 13 are open by 8am and 5 are still going at 10pm.
What does it cost?
The median band starts around Rp 50K a head. 7 start under Rp 50K.
Which are worth a detour?
Flatto, Tarisa Café, de'TOPAZ Cafe Seseh — all rated 4.6 or better with fewer than 150 reviews each.