The last of two vaccination sessions for measles will take place at Devizes School on Friday.
Two cases were confirmed and a number of others are suspected at the school.
Immunisation against measles, mumps and rubella is also open to pupils' families.
The first session was held on Wednesday.
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It will be a breezy start, with clouds arriving around lunchtime. The afternoon will be sunny with showers.
Tuesday will start dry and bright with lighter winds, before cloud thickens bringing some outbreaks of rain through the afternoon.
The day's gusts will ease as the evening goes on. It will be mostly dry with cloud cover but occasional clear spells.