Weather & Tides-August 18, 2025

NATIONAL WEATHER SERVICE REPORT 

Monday, August 18th, 2025

SYNOPSIS: Warmer trends and the possibility of heat risk by the end of the week are to be expected as ridging sets in and high pressure becomes the prevailing trend. A gradual drying and warming trend will develop this week, with further warming late in the week along with low relative humidity. 

TODAY: 

Inland: Sunny, with a high near 86. Light and variable wind.

Along the Coast: Mostly cloudy, then gradually becoming sunny, with a high near 65. Northwest wind 3 to 8 mph. 

TONIGHT:  

Inland: Clear, with a low around 49. North wind 3 to 8 mph. 

Along the Coast: Increasing clouds, with a low around 51. North wind 3 to 6 mph. 

Extended Forecast: High pressure will gradually rebuild this week, bringing drier weather, more sunshine, and a steady warming trend following the light weekend rain. Coastal stratus and fog will become less persistent at night, while inland valleys heat up, with the best chance of reaching over 100°F by Friday. A brief disturbance on Wednesday may slightly slow the warm-up, but the overall trend is toward hotter conditions by late week into the weekend. There’s also a small chance that some monsoonal moisture sneaks in from the southeast this weekend, which could bring isolated thunderstorms, though current odds remain low.

Predicted Temperatures

Location	High Today	Low Tonight	HighTomorrow
Inland	86	49	92
Along The Coast	65	51	65

The coastal waters forecast from Point Saint George to Cape Mendocino and out to 10 nautical miles.

Today	Wind	N 5 kt, backing to NW 5 kt this afternoon.
	Waves	NW 5 ft at 10 seconds. Patchy dense fog this morning.
Tonight	Wind	N 5 to 10 kt.
	Waves	NW 4 ft at 9 seconds. Patchy dense fog.

The coastal waters forecast from Cape Mendocino to Point Arena and out to 10 nautical miles. 

Today	Wind	NW 5 to 10 kt.
	Waves	NW 3 ft at 4 seconds and NW 4 ft at 10 seconds. Patchy dense fog.
Tonight	Wind	NW 10 to 15 kt.
	Waves	NW 3 ft at 4 seconds and NW 4 ft at 9 seconds.

Lastly, here are the solar and lunar phases and tidal information : Today, Monday, August 18th, the sun rose in Shelter Cove at 6:31am and the sunset will be at 8:07pm, for a total of 13 hours and 35 minutes of sunlight. The next high tide at 7:27 pm, at 6.6ft. The next low tide will be at 1:02 pm, at 3.4ft. The waning crescent moon rose in the northeast at 1:12am and will set in the northwest at 5:27 pm. According to the solunar theory, today is an average day for fishing, the fish activity forecast is average.