Generally, you can anticipate the weather in Cornwall right through the month of March is 5. Average highs are typically 9 and average daily low being 5 celsius. We have put some more information here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 5 |
| High Temperature | 9 |
| Low Temperature | 5 |
| Sunshine Per Day | 5 |
Useful Links: Cornwall Weather: Average Weather & Yearly Climate