The first day of the 2025 Open Championship is expected to be rainy, with periods of heavy rain that could accumulate up to a quarter of an inch. The high temperature is expected to be around 69 degrees, with a low of 57 degrees, and winds will range from 10 to 20 miles per hour, according to The Weather Channel.

All forecasts courtesy of AccuWeather Thursday weather forecast at Royal Portrush Thursday will be the windiest day of the week, according to forecasters, who are calling for cloudy conditions with winds at 15-25 mph from the southeast.