Marine Weather and Tide Forecast for Fremont, CA

SHORT TERM
Issued at 244 PM PDT Fri Mar 13 2026 (This evening through Saturday)

Pleasant, above normal temperatures are expected across the region today with forecasted highs running 10-15 degrees above normal.
However, there is one caveat to today's high temperatures: cloud cover. Satellite shows high level clouds streaming across much of the Bay Area and Central Coast while a shallow marine layer is bringing low level clouds directly along the coastline. The shallow marine layer is keeping temperatures cool along the coast with both HAF and MRY at 55 degrees as of 1PM. Temperatures are a bit higher (mid to upper 60s) across inland areas where low level clouds have cleared. Made some tweaks to the high temperature forecast for today and bumped afternoon highs down to the low 60s directly along the coast to account for the persistent shallow marine layer. Generally expecting temperatures to peak in the mid to upper 70s across the interior today before cooling down into the upper 40s to low 50s tonight. If you have any outdoor activities today and Saturday will be the best days for them as they are the two coolest days of the upcoming forecast period.

LONG TERM
Issued at 244 PM PDT Fri Mar 13 2026 (Saturday night through next Thursday)

Upper level ridging builds in across the region Saturday before fully settling in by late weekend. Temperatures on Saturday will be fairly similar to those observed on Friday with highs in the upper 70s to low 80s across the interior and 60s directly along the coastline. Both HRRR and WRF guidance suggest a shallow (500 ft)
marine layer is possible again Saturday morning which will keep coastal areas cooler than interior areas.

Saturday will generally be the last "pleasant" day of the Long Term forecast. By Sunday, the center of the upper level ridge will push into California and usher in the start of our prolonged heat wave.
The center of the upper level ridge will then remain over the California/Arizona border through late next week, potentially sticking around into next weekend. This unusually strong ridge is bringing us late summer like weather with 500mb heights around 5900 meters. Sunday will act as a transition day between the more pleasant Saturday temperatures to full summer on Monday with highs in the upper 70s to mid 80s. Starting Monday, highs across the interior will rise into the upper 80s to 90s. It will then stay that hot through the remainder of the long term forecast. This has the potential to break numerous daily high temperature records and even some all time high temperature records for March.

It is worth noting that temperatures may in fact go up during the second half of the week (starting Wednesday) as the ridge strengthens further. The NBM 95th Percentile (a reasonable high end scenario) pushes temperatures into the upper 90s to low 100s across the interior Central Coast and portions of the Santa Cruz Mountains/interior valleys Wednesday through late week. There is enough supporting evidence to say that this heatwave will extend through Friday and likely into the weekend given the longevity and restrengthening of the upper level ridge. Currently, Moderate HeatRisk is only forecast Monday through Wednesday but this is likely to expand through the rest of the week as the temperature forecast continues to increase. If you are spending any time outdoors this week, remember to drink plenty of water and allow your body to rest as needed. This heatwave is a marathon not a sprint with overnight conditions to offer at least some respite from daytime heat. Heat Advisories are likely to be issued for much of the urban areas and adjacent Santa Cruz Mountains/Diablo Range starting Monday and continuing through late week. For now, we are not anticipating issuing an Extreme Heat Watch/Warning as overnight temperatures will cool enough to prevent us from reaching Extreme Heat criteria. We will, however, need to keep a close eye on the forecast for the second half of the week as models are signaling that it could be even warmer than the first half.

As small, fine fuels (grass) cure this week, the potential for grass fires will increase. Offshore winds will remain light to moderate which will help mitigate how much any fires that do develop can grow. If you are participating in any outdoor activities (camping, offroading, hiking, etc) exercise caution when using fire and be aware that the risk of grass fires will be elevated next week.

AVIATION
(00Z TAFS)
Issued at 450 PM PDT Fri Mar 13 2026

Light to moderate winds reduce into the night for areas not along the immediate coast, meaning HAF continues to see moderate winds through the night. Low CIGs look to form in the evening around the Monterey Bay into the night as well as at HAF, then STS looks to have moments of low CIGs and Mist into Saturday morning. Moderate winds return Saturday afternoon for most areas, while the coast (and HAF) see strong gusts. Cloud cover erodes into the afternoon but hazy conditions look to form in most of the valleys and along the coast into the weekend.

Vicinity of SFO...VFR through the TAF period. Moderate west winds linger into the night before reducing. Northwest winds build again into Saturday afternoon and last into late that night before becoming light again.

SFO Bridge Approach...Scattered low clouds look to move around the Eastern SF Bay into Saturday morning, with a few passing through the approach until the late morning.

Monterey Bay Terminals...VFR lasts into the night before winds become light and IFR CIGs arrive to MRY. IFR CIGs will be slower to arrive to SNS, but are expected into early Saturday morning while MRY begins to see moments of LIFR CIGS. Expect some mist and reduced visibilities along with the building cloud cover. VFR returns in the mid to late morning as moderate west to northwest winds build.

MARINE
(Tonight through next Wednesday)
Issued at 450 PM PDT Fri Mar 13 2026

An unusually strong ridge of high pressure for this time of year will continue to build offshore and dominate our pattern through the extended forecast. Fresh to moderate north/northwest breezes will result in locally hazardous conditions through the weekend.
Winds and seas will ease for the beginning of next week.

CLIMATE
Issued at 614 PM PDT Thu Mar 12 2026

The following are the record high temperatures at the long term sites for March 15th, 16th, 17th and 18th.

Location Mar 15 Mar 16 Mar 17 Mar 18

Santa Rosa 88 in 2004 91 in 2004 87 in 1996 84 in 2010 San Rafael 83 in 1972 87 in 1972 84 in 1972 80 in 1996 Kentfield 85 in 2004 86 in 2004 87 in 1914 89 in 1914 Napa 86 in 2004 88 in 2004 92 in 1914 87 in 1914 Richmond 85 in 2004 84 in 1972 83 in 2004 78 in 1996 Livermore 83 in 1972 88 in 1972 87 in 1972 86 in 2004 San Francisco 82 in 2004 85 in 1914 85 in 1914 86 in 1914 SFO Airport 81 in 2004 82 in 2004 82 in 2004 77 in 2004 Redwood City 84 in 2004 84 in 2004 85 in 2004 84 in 2004 Half Moon Bay 74 in 1974 78 in 1972 83 in 2004 75 in 1978 Oakland Museum 85 in 2004 85 in 2004 85 in 2004 81 in 2004 San Jose 82 in 2004 85 in 1914 88 in 1914 87 in 1914 Salinas Airport 83 in 1972 87 in 2004 87 in 2004 84 in 1960

MTR WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...Small Craft Advisory until 3 AM PDT Sunday for Pt Arena to Pt Reyes 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.

Small Craft Advisory from 9 PM this evening to 3 AM PDT Sunday for Pigeon Pt to Pt Pinos 0-10 nm.

Small Craft Advisory until 9 PM PDT Sunday for Pt Arena to Pt Reyes 10-60 NM.

Small Craft Advisory until 3 PM PDT Sunday for Pigeon Pt to Pt Pinos 10-60 NM.