| Sut mae'r tywydd heddiw? | How's the weather today? |
| Mae hi'n ddiflas. | It's miserable. |
| Mae hi'n dwym. | It's warm. |
| Mae hi'n braf. | It's fine. |
| Mae hi'n wyntog. | It's windy. |
| Mae hi'n gymylog. | It's cloudy. |
| Mae hi'n oer. | It's cold. |
| poeth | hot |
| oer | cold |
| cynnes | warm |
| braf | fine |
| gwlyb | wet |
| bwrw glaw | raining |
| bwrw eira | snowing |
| diflas | miserable |
| annifyr | miserable |
| gwyntog | windy |
| heulog | sunny |
| twym | warm |
| stormus | stormy |
| niwlog | foggy |
| cymylog | cloudy |