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FORECAST: When can we expect rain chances to increase?

WPTV First Alert Weather Forecast for Evening of Tuesday, Aug. 18, 2026
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WEST PALM BEACH, Fla. — Tuesday will be exceptionally hot, with highs generally in the mid to upper 90s, and some spots near 98 degrees. With humidity, it will feel more like 105 degrees to 112 degrees. A Heat Advisory is in effect today, so the afternoon heat should be taken seriously.

WPTV First Alert Weather Forecast for Evening of Tuesday, Aug. 18, 2026

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After a dry spell these past few days, moisture begins returning to the area.

Rain and storm chances increase, especially Wednesday afternoon and evening, with another increase Thursday and Friday. The Treasure Coast should have the better opportunity for storms as moisture builds back in.

This weekend, expect the heat to ease slightly from Tuesday's extreme levels, but it will remain very hot and humid, generally in the lower to mid-90s. Afternoon showers and thunderstorms should become more common, particularly Thursday into the weekend.

**Portions of this story were assisted by artificial intelligence tools and reviewed by WPTV journalists to ensure accuracy, clarity, and adherence to editorial standards.