Weather & Tides-Sept.17, 2025

NATIONAL WEATHER SERVICE REPORT 

Wednesday, September 17th, 2025

SYNOPSIS: Hot and dry weather will persist through Wednesday with gusty nearshore winds. Cooler weather, scattered showers, and a slight chance for thunderstorms will return Thursday into the weekend.

TODAY: 

Inland: Sunny, with a high near 93. North wind 9 to 11 mph.

Along the Coast: Mostly sunny, with a high near 66. Northwest wind 3 to 8 mph.

TONIGHT:  

Inland: Increasing clouds, with a low around 54. North wind 6 to 13 mph. 

Along the Coast: Mostly cloudy, with a low around 56. North northwest wind 5 to 9 mph becoming calm in the evening.

Extended Forecast: Coastal clouds and fog (stratus) will return overnight but are expected to clear by late Wednesday morning as the recent warm, dry pattern continues briefly. However, a low-pressure system is on the way and will bring a change in the weather by the weekend.

Hot temperatures will persist inland through Wednesday, with some valleys hitting the upper 90s or even low 100s, creating moderate heat risk. Starting late Wednesday, moisture from a fading tropical system will move in from the south, bringing a small chance (around 10%) of showers or thunderstorms—mainly in Lake and Mendocino counties. Rain chances increase Friday into Saturday as more moisture arrives and a low-pressure system forms along the coast, but exact timing and locations for rain and storms are still uncertain.

Predicted Temperatures

Location	High Today	Low Tonight	HighTomorrow
Inland	93	54	92
Along The Coast	66	56	64

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

SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH LATE TONIGHT

HAZARDOUS SEAS WATCH IN EFFECT FROM LATE TONIGHT THROUGH THURSDAY EVENING

Today	Wind	N 10 to 15 kt
	Waves	NW 4 ft at 5 seconds and W 3 ft at 10 seconds.
Tonight	Wind	N 15 to 20 kt.
	Waves	NW 7 ft at 7 seconds and W 4 ft at 11 seconds.

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

SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH THURSDAY MORNING

Today	Wind	NW 10 to 15 kt, rising to 15 to 20 kt with gusts up to 35 kt this afternoon.
	Waves	NW 5 ft at 5 seconds and W 3 ft at 10 seconds. Patchy dense fog this morning.
Tonight	Wind	NW 20 to 25 kt with gusts up to 35 kt.
	Waves	N 7 ft at 7 seconds and NW 4 ft at 11 seconds.

Lastly, here are the solar and lunar phases and tidal information : Today, Wednesday, September 17th, the sun rose in Shelter Cove at 7:00am and the sunset will be at 7:20pm, for a total of 12 hours and 20 minutes of sunlight. The next high tide at 8:35 pm, at 6.1ft. The next low tide will be at 2:41 pm, at 3.0ft. The waning crescent moon rose in the northeast at 2:27 am and will set in the northwest at 5:37 pm.    According to the solunar theory, today is an average day for fishing, the fish activity forecast is average.