What is the primary difference between a scientific theory and a scientific law? A scientific law is an assumed truth which forms the basis of your theory. Scientific laws are universal and describe observed events.
Average temperature in St Lucia in March: 22 to 28Â°C, 72 to 84Â°F. Sea temperature in St Lucia in March: 26Â°C, 79Â°F. Average rainfall in March: 97mm, 3.8in. Events: St Luciaâs annual festival of comedy kicks off in March with events and shows throughout the month.
Re: How is the weather in St. Lucia in July and August. Jun 27, 2011, 11:47 PM. My husband and I were in St. Lucia last year in the last week of August. At that time, we had a little rain (as in, it rained for like 15min a couple of days).