809
FNUS76 KSGX 181904
FWSSGX
SPOT FORECAST FOR MATEO...USFS
NATIONAL WEATHER SERVICE SAN DIEGO CA
1204 PM PDT THU JUN 18 2026
FORECAST IS BASED ON FORECAST START TIME OF 1200 PDT ON JUNE 18.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
BELOW AVERAGE TEMPERATURES WITH MARINE LAYER LOW CLOUDS AND FOG
REACHING INTO PORTIONS OF THE VALLEYS THROUGH SUNDAY. GUSTY WESTERLY
WINDS EXPECTED IN THE MOUNTAINS AND DESERTS THIS AFTERNOON AND
EVENING AND AGAIN FRIDAY AFTERNOON AND EVENING. WARMING TREND
EXPECTED MONDAY THROUGH AT LEAST THE MIDDLE OF NEXT WEEK. AREAS OF
MAJOR HEATRISK POSSIBLE FOR THE DESERTS AND MODERATE HEATRISK FOR
INLAND ORANGE COUNTY, VALLEYS, AND MOUNTAINS MID NEXT WEEK. THE
MARINE LAYER WILL BECOME SHALLOWER NEXT WEEK, STAYING CONFINED TO
COASTAL LOCATIONS.
REST OF TODAY
SKY/WEATHER.........PARTLY CLOUDY (20-30 PERCENT) THEN BECOMING
MOSTLY SUNNY (5-15 PERCENT) THEN BECOMING
PARTLY CLOUDY (20-30 PERCENT).
MAX TEMPERATURE.....AROUND 72.
MIN HUMIDITY........70 PERCENT.
EYE LEVEL WINDS.....WEST WINDS UP TO 5 MPH.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS 6 TO 8 MPH.
RIDGETOP...........SOUTH AROUND 0 MPH SHIFTING TO THE SOUTHWEST
LATE IN THE AFTERNOON.
CWR.................0 PERCENT.
TIME (PDT) 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........27 27 10 10 10 27
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
TEMP............70 71 71 72 71 70
RH..............73 72 71 70 72 72
20 FT WIND DIR..SW SW W W W W
20 FT WIND SPD..6 7 8 7 7 7
20 FT WIND GUST.11 12 13 13 12 12
EYE LVL WND DIR.SW SW W W W W
EYE LVL WND SPD.4 4 5 5 5 4
EYE LVL WND GST.8 9 9 9 9 9
RIDGE WIND DIR..S S SE W W SW
RIDGE WIND SPD..0 0 0 0 5 0
CWR.............0 0 0 0 0 0
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT) THEN BECOMING
CLOUDY (85-95 PERCENT).
MIN TEMPERATURE.....AROUND 57.
MAX HUMIDITY........100 PERCENT.
EYE LEVEL WINDS.....WEST WINDS AROUND 4 MPH IN THE EVENING BECOMING
LIGHT.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS 5 TO 6 MPH IN THE EVENING BECOMING
LIGHT.
RIDGETOP...........WEST AROUND 5 MPH SHIFTING TO THE NORTH EARLY
IN THE EVENING, THEN SHIFTING TO THE NORTHWEST
LATE IN THE EVENING SHIFTING TO THE EAST LATE
IN THE EVENING SHIFTING TO THE WEST SHIFTING TO
THE SOUTH OVERNIGHT SHIFTING TO THE SOUTHWEST.
CWR.................1 PERCENT.
TIME (PDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........27 27 62 62 62 83 83 83 80 80 80 97
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
TEMP............69 67 64 62 61 61 60 60 59 59 59 59
RH..............73 78 84 87 88 89 91 92 93 96 96 96
20 FT WIND DIR..W W W W W W NW NW W W W W
20 FT WIND SPD..7 6 6 6 5 5 3 2 2 2 2 2
20 FT WIND GUST.11 11 11 10 9 8 7 6 6 6 6 5
EYE LVL WND DIR.W W W W W W NW NW W W W W
EYE LVL WND SPD.4 4 4 4 4 3 2 1 1 1 1 1
EYE LVL WND GST.8 8 8 7 7 6 5 4 4 4 4 4
RIDGE WIND DIR..W W N NW NW E W W SE SW SW S
RIDGE WIND SPD..5 5 0 5 5 0 5 0 5 0 0 5
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
JUNETEENTH
SKY/WEATHER.........CLOUDY (90-100 PERCENT) THEN BECOMING MOSTLY
SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....AROUND 72.
MIN HUMIDITY........65 PERCENT.
EYE LEVEL WINDS.....LIGHT WINDS BECOMING WEST UP TO 6 MPH WITH
GUSTS TO AROUND 11 MPH LATE IN THE MORNING.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS 5 TO 8 MPH EARLY IN THE MORNING
BECOMING LIGHT, THEN BECOMING WEST 6 TO 8 MPH
WITH GUSTS TO AROUND 15 MPH LATE IN THE
MORNING.
RIDGETOP...........SOUTHWEST 0 TO 5 MPH SHIFTING TO THE WEST IN
THE AFTERNOON.
CWR.................0 PERCENT.
TIME (PDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........97 97 89 89 89 16 16 16 5 5 5 17
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
TEMP............57 59 60 63 67 68 70 71 71 72 71 70
RH..............100 97 93 86 76 73 69 68 66 65 67 67
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..1 2 2 2 3 6 7 8 8 8 8 8
20 FT WIND GUST.5 5 5 6 8 11 13 14 14 15 15 14
EYE LVL WND DIR.W W W W W W W W W W W W
EYE LVL WND SPD.1 1 1 1 3 4 5 6 6 6 6 6
EYE LVL WND GST.4 4 4 5 6 8 9 10 10 11 11 10
RIDGE WIND DIR..S SW SW SW SW SW SW W W W W W
RIDGE WIND SPD..5 5 5 5 0 0 0 0 5 5 5 5
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
FORECAST DAYS 3 THROUGH 5
SATURDAY
PARTLY CLOUDY. LOWS IN THE MID 50S. HIGHS IN THE LOWER 70S.
NORTHWEST WINDS AROUND 5 MPH.
SUNDAY
PARTLY CLOUDY. LOWS IN THE MID 50S. HIGHS IN THE LOWER 70S.
NORTHWEST WINDS AROUND 5 MPH.
MONDAY
PARTLY CLOUDY. LOWS IN THE MID 50S. HIGHS IN THE LOWER 70S. LIGHT
WINDS.
FORECASTER...IVORY SMALL
REQUESTED BY...DANIEL NAYLOR
TYPE OF REQUEST...WILDFIRE
.TAG 2615722.1/SGX
.DELDT 06/18/26
.FORMATTERVERSION 2.0.0
.EMAIL DANIEL.NAYLOR@USDA.GOV
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