Weather & Tides-Sept.18, 2025

NATIONAL WEATHER SERVICE REPORT 

Thursday, September 18th, 2025

SYNOPSIS: Inland temperatures will cool down Thursday with the arrival of cloudcover and precipitation. Thunderstorm activity is expected Thursday through Saturday. After a short period of drying, rain chances increase again early next week.

TODAY: 

Inland: A 20 percent chance of rain after 2pm. Partly sunny, with a high near 92. North wind 5 to 9 mph.

Along the Coast: Cloudy, then gradually becoming mostly sunny, with a high near 65. Light north northwest wind increasing to 6 to 11 mph in the afternoon.

TONIGHT:  

Inland: A slight chance of showers and thunderstorms before 11pm, then a slight chance of rain between 11pm and 2am, then a slight chance of showers after 2am. Mostly cloudy, with a low around 57. North wind 5 to 10 mph becoming light and variable in the evening. Chance of precipitation is 20%.

Along the Coast: A 20 percent chance of showers after 2am. Patchy dense fog after 2am. Otherwise, mostly cloudy, with a low around 56. North northwest wind 5 to 7 mph becoming light and variable after midnight.

Extended Forecast: Moisture from a decaying tropical system will move north into the region starting Thursday, bringing increasing clouds and a chance of showers. In meteorology, “decaying” means that a weather system, such as a tropical storm or low-pressure area, is weakening or losing its organization and strength over time. This can mean that its winds, rainfall, or thunderstorms are getting lighter, its central pressure is rising, and its overall effect is diminishing. As the system decays, it may break apart and eventually disappear, leaving behind only remnants like scattered clouds or light rain.

Early in the event, thunderstorms could be drier, creating gusty winds and a fire weather risk. By Friday, moisture will be stronger, lowering the fire risk but raising the chance of heavier showers or isolated flooding issues, especially in areas prone to mudslides. Conditions may gradually improve by Saturday, though sunshine and surface heating could still spark scattered thunderstorms inland.

Predicted Temperatures

Location	High Today	Low Tonight	HighTomorrow
Inland	92	57	88
Along The Coast	65	56	67

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

SMALL CRAFT ADVISORY IN EFFECT UNTIL 7 AM PDT THIS MORNING

HAZARDOUS SEAS WARNING IN EFFECT FROM 7 AM PDT THIS MORNING THROUGH LATE TONIGHT

Today	Wind	N 15 to 20 kt. Gusts up to 40 kt this afternoon.
	Waves	NW 10 ft at 11 seconds.
Tonight	Wind	N 10 to 15 kt.
	Waves	NW 11 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 THROUGH THIS EVENING

Today	Wind	N 30 to 35 kt. Gusts up to 35 kt this afternoon.
	Waves	NW 10 ft at 10 seconds and S 2 ft at 15 seconds.
Tonight	Wind	SE 10 to 15 kt.
	Waves	NW 9 ft at 10 seconds and S 2 ft at 15 seconds.

Lastly, here are the solar and lunar phases and tidal information : Today, Thursday, September 18th, the sun rose in Shelter Cove at 7:01am and the sunset will be at 7:18pm, for a total of 12 hours and 17 minutes of sunlight. The first high tide will be at 10:27am, at 5.1ft., and the next high tide at 9:36pm, at 6.1ft.  The next low tide will be at 3:44pm, at 2.5ft. The waning crescent moon rose in the northeast at 3:37 am and will set in the northwest at 6:05 pm. According to the solunar theory, today is a good day for fishing, the fish activity forecast is high.