Moon is full tonight. 51.
Tonight weather cleared a deal.
Every word in which 'th' is prohibited has final syllable stress (tonight, cigarette) or secondary stress on the final syllable (acrobat, internet), and so ends in a full, non-weak vowel.
We hope to sight tonight.
Tonight your name will be on everybody's lips.
There is nothing to eat for tonight.
The sky is red tonight.
However, if you take the pill today and it does not work, it causes a sudden and painless death in your sleep tonight.