More rain coming? No big accumulations are expected. The rain chances look better for the coast and valleys on Friday, the mountains and desert on Saturday. Both days should be cooler than normal. #sandiegoweather #CAwx

Lightning crawler over San Francisco skyline this morning (Thursday, Sept. 25) #CAwx

"Heart of Oak" for #TreeTuesday Coast Live Oaks trunks appear to form the shape of a human heart with its chambers. Photographed at Los Peñasquitos Canyon Preserve, San Diego, California. alexander-kunz.pixels.com/featured/hea... #BlackAndWhite #Trees #SanDiego #CoastLiveOak #NaturePhotography

Carmel Mountain sunset tonight, from the National Weather Service’s Miguel Miller. #sandiegoweather #CAwx

Hours of daylight throughout the year in the Northern Hemisphere.

Every little bit helps a little bit. 24-hour rainfall totals in San Diego County, as of 9 a.m. #sandiegoweather #CAwx

The sky over LA tonight.

My brother grabbed this sunset shot from the Colorado River at Needles tonight. #CAwx

Happy last full day of summer! Fall begins at 11:19 a.m. Monday. San Diego's high today was 77, normal for Sept. 21. The weather service expects autumn to begin warmer than normal, with a high of 80 in San Diego. #sandiegoweather #CAwx

A few spots in San Diego County recorded measurable rain today: Valley Center, 0.05 of an inch; Oceanside Harbor, Vista, Encinitas, San Marcos, 0.03; Santee, 0.02; Rancho Bernardo, Mount Laguna, Carlsbad, 0.01. San Diego had a trace. More light rain possible Monday & Tuesday. #CAwx #sandiegoweather

Do you remember, the kind of September, where San Diego got semi-tropical rain twice in a week? It doesn't happen too many years, but there's a chance more rain will arrive Sunday and/or Monday. The city recorded 0.45 of an inch from TS Mario remnants Wednesday & Thursday. #sandiegoweather #CAwx

Thanks, Mario. Leftover subtropical moisture has enhanced our sunsets and sunrises. This morning from inland North County. #sandiegoweather #CAwx

Clouds miles NE of us putting on huge lightning show.

Just south in RB:

Wonderful sunset in Escondido tonight, from the always sky-vigilant Sean Peer. #sandiegoweather #CAwx

I found Barney in the clouds!

Our goal is to plant 20,000 oak seedlings in 2026. Donations, of acorns or money, will help us meet our target. It cost roughly $1.75 to raise each seedling. Contact Jim Crouch at [email protected] to give what you can and help repopulate native oaks in Southern California. #oaks #trees

If you were hoping to shrink the fall fire danger, you couldn't ask for a better day on Palomar Mountain, which has recorded 1.47 inches of rain in the last 24 hours. #sandiegoweather #CAwx

The October monthly temperature outlook just dropped from the Climate Prediction Center (CPC). No blue anywhere! 😭

Soggy September: San Diego's total is missing on the map below, but the city has recorded 0.45 of an inch of rain. Normal for all of September is 0.12. And this good soaking in the mountains should tamp down the fire danger up there for awhile. Mount Laguna has had 0.64. #sandiegoweather #CAwx

Escondido sunrise after a wet night. Photo from Sean Peer, who said he got 0.35 of an inch of rain. #CAwx #sandiegoweather

It's been raining pretty steadily in Esco since ~1:30 a.m., maybe earlier.

Heavy downpour at 3:15 a.m. here in inland North County. #CAwx #sandiegoweather

The Southern California mountains and desert are under a flood watch through Thursday night. Excessive rainfall could potentially cause flash floods, especially in recent burn areas. #CAwx #sandiegoweather

Rain today was mostly in the southern half of S.D. County. Some totals, as of 5 p.m: Santee, 0.22 of an inch; Brown Field, 0.14; San Diego, 0.10; Coronado North Island, 0.08; La Mesa, 0.05; Chula Vista, 0.04; National City, 0.03; Escondido, 0.02. More widespread rain Thurs. #sandiegoweather #CAwx

Mostly cloudy and a few drops of rain are falling. #AZwx

My son sends this shot of a narrow strip of fog this morning obscuring part of the Golden Gate Bridge. Down here in San Diego County, cumulus clouds are building over the mountains. #CAwx

It should be a fine day to keep eyes on the skies over San Diego County. Remnants of Tropical Storm Mario are already over the region. Increasing clouds will bring a chance of showers and thunderstorms this afternoon. The odds improve tonight and increase more on Thursday. #CAwx #sandiegoweather

Warmth everywhere as fall begins: Don't see a map like this from the Climate Prediction Center too often. Nearly the entire Lower 48 is likely to be warmer than normal during the Sept. 22 to 26 period. Only a small slice of the Northwest isn't projected to be warm.

The weather service's latest forecast has upped the odds for widespread rain on Thursday in Southern California. Mario has been downgraded to a tropical depression, but remnant moisture from the storm should start making it to San Diego County tonight or Wed. morning. #sandiegoweather #Mario #CAwx

Our next Tree Trek (neighborhood walk) is Saturday at 10 a.m. at Colina Del Sol Park in City Heights. Learn tree ID and local programs from certified arborists as we walk the neighborhood. #trees

Changing seasons in the Northeast Kingdom of Vermont - 📸: Ken Rachlis

America's finest tropical city? For the 2nd time in 3 weeks, we could get rain from the remnants of a tropical storm. And we might get more next week. Best chances this round are on Thursday, but rain is possible Wed. to Fri. morn. Juliette brought widepsread rain Aug. 28. #sandiegoweather #CAwx

Tropical Storm Mario's days, actually hours, are numbered. But clouds spinning off the storm should arrive over Southern California later today. Those clouds will keep the valleys cooler Wednesday, but they'll also bring a good chance of showers through Friday morning. #sandiegoweather #CAwx

It's hard to overstate just how off the charts warm the Pacific is right now. The swath of the basin from California to Japan (a HUGE area) from 25N to 60N is ~3F (1.6C) above normal. To put it into math terms that is 6 Sigma/ standard deviations above the mean. More… 1/

It's mid September, and plenty of highs in the 90s in the San Diego County valleys. But that's no surprise. Today's temps: Santee, Alpine, 94; Valley Center, San Pasqual Valley, 93; Escondido, Ramona, 92; Poway, 91; El Cajon, 90. San Diego reached 77, normal for the date. #sandiegoweather #CAwx

Hottest day since October in San Francisco! 83 degrees! #CAwx

That's favorite, too.

While Sea Surface Temperatures Anomalies (SSTA) edge toward La NIña territory in the tropics, the north Pacific continues to warm. Here's a comparison of Pacific SSTAs in mid-Sept for the past 7 years.

The fog lifted quickly this morning at Escondido’s Dixon Lake. Marine-layer influence should diminish as the week progresses, but we could see upper-level subtropical moisture by Tuesday, and rain is possible on Thursday. #sandiegoweather #CAwx

The weather service says we should start to see upper-level moisture spinning off Tropical Storm Mario in So Cal as early as Tuesday. The mountains will have a chance of rain Wednesday, but the odds of the entire region catching rain & a thunderstorm will be highest Thursday. #sandiegoweather #CAwx

Keeping it cool: A 2,500-foot-deep marine layer will keep temperatures below normal for another day. We should see fewer low clouds & more warmth Monday. Some subtropical high-level clouds could arrive Tuesday, when the valleys should be back in the 90s, the coast around 80. #sandiegoweather #CAwx

Overcasting: A healthy marine layer should keep temps below normal today, says the weather service. But a warming trend should take the highs slightly above normal Tuesday & Wednesday. Then monsoonal moisture brings back thunderstorms chances Thurs. & Fri. in mtns. & desert. #CAwx #sandiegoweather

Can’t say I’ve ever seen an Ocean Heat Blob this intense & vast, over the entirety of the Pacific basin - the marine heatwave is literally from coast to coast. It’s remarkable. Since May the record heat has now migrated to US West Coast. Note: the Tropical Pacific is cooling (La Nina forming)

It’s another beautiful, partly cloudy night for baseball before the Pads face the Rockies at Petco. It’s 72 degrees with a light breeze. #Padres #CAwx #sandiegoweather

Tree San Diego’s first-ever Plant-A-Thon is near! Our goal is to plant & distribute 1,000 trees in 10 weeks. We kick things off Oct. 10 in National City. The initiative spans San Diego County, bringing trees to neighborhoods that need them the most. Details: www.treesandiego.org/plantathon #trees

Beautiful morning in Escondido. Photo from Sean Peer. A gradual warming trend is on tap, although highs today should remain below normal. By next Wednesday, the weather service expects temps to be about 5 degrees above normal. #sandiegoweather #CAwx

It’s a partly cloudy but beautiful night for baseball at Petco before the Pads face the Reds in 5:40 p.m. rubber game of the series. It’s 73 degrees with no wind. #CAwx #sandiegoweather #Padres

Such beautiful news.

September gloom: Onshore flow kick-started by a low-pressure system moving into the West has given much of San Diego county a gray start to the day. High temperatures will drop today, then even more Wednesday & Thursday to well below normal. #CAwx #sandiegoweather