166
FNUS76 KSTO 200330
FWSSTO

Spot Forecast for Niles/ Canyon RX...CAL FIRE
National Weather Service Sacramento CA
830 PM PDT Sat Sep 19 2026

Forecast is based on ignition time of 0800 PDT on September 21.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...
Generally warm, dry, and calm conditions near the burn site through most
of the upcoming week. High temperatures will be in the high 80s to mid-90s,
with cool overnight lows in the 60s to low 70s. Winds will generally be
fairly light, less than 10 mph sustained speeds and gusts less than 15 mph.
Overnight and through the mornings, winds will be very light and terrain
driven. In the afternoons and evenings, winds will become more southerly
and slightly stronger, though always staying below 15 mph. Humidities will
be relatively good this week, with the lowest values expected on Thursday
(the only day there is significant potential for values in the teens);
otherwise, humidities will generally be 20% or above during the day all
week, with moderate overnight recoveries.

.MONDAY...

Sky/weather.........Sunny.
Max temperature.....90-94.
Min humidity........21-25 percent.
Wind (20 ft)........
 Slope/valley.......Light and variable winds becoming south up to 6 mph
in the afternoon.
 Ridgetop...........North around 5 mph shifting to the southwest 2
                    to 10 mph late in the morning.
Mixing height.......5400 ft AGL.
Transport winds.....North around 5 mph shifting to the southwest 2
                    to 10 mph late in the morning.
CWR.................0 percent.
Chance of thunder...0 percent.

TIME (PDT)      8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky cover.......PC  PC  PC  MCR MCR MCR MCR MCR MCR MCR
CWR.............0   0   0   0   0   0   0   0   0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0
Temp............64  68  75  79  82  87  89  90  92  91
RH..............54  47  40  35  32  28  25  23  23  23
SL/VL wind dir..NE  NE  NE  SE  SE  SE  S   S   S   S
SL/VL wind spd..2   2   2   2   2   2   3   3   3   6
SL/VL wind gust.7   7   7   7   7   7   12  12  12  13
Ridge wind dir..N   N   N   SW  SW  SW  S   S   S   S
Ridge wind spd..5   5   5   2   2   2   7   7   7   9
Mix hgt (kft)...0.8 0.8 0.8 3.3 3.3 3.3 5.4 5.4 5.4 3.7
Transp wind dir.N   N   N   SW  SW  SW  S   S   S   S
Transp wind spd.5   5   5   2   2   2   7   7   7   9

.MONDAY NIGHT...

Sky/weather.........Mostly clear.
Min temperature.....58-63.
Max humidity........64-71 percent.
Wind (20 ft)........
 Slope/valley.......South winds up to 6 mph early in the evening
                    becoming light and variable.
 Ridgetop...........South 5 to 12 mph shifting to the north around
                    3 mph overnight, then shifting to the northwest
                    around 6 mph early in the morning.
Mixing height.......400 ft AGL.
Transport winds.....South 5 to 12 mph shifting to the north around
                    3 mph overnight, then shifting to the northwest
                    around 6 mph early in the morning.
CWR.................0 percent.
Chance of thunder...0 percent.

TIME (PDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky cover.......MCR MCR MCR MCR MCR MCR MCR MCR MCR MCR MCR CLR
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............90  86  81  77  74  72  70  68  67  65  64  63
RH..............24  28  33  38  44  49  53  55  58  61  64  66
SL/VL wind dir..S   S   S   S   S   N   N   N   N   N   N   N
SL/VL wind spd..6   6   3   3   3   0   0   0   0   0   0   0
SL/VL wind gust.13  13  8   8   8   2   2   2   2   2   2   3
Ridge wind dir..S   S   S   S   S   S   S   S   N   N   N   NW
Ridge wind spd..9   9   12  12  12  5   5   5   3   3   3   6
Mix hgt (kft)...3.7 3.7 0.6 0.6 0.6 0.5 0.5 0.5 0.4 0.4 0.4 0.4
Transp wind dir.S   S   S   S   S   S   S   S   N   N   N   NW
Transp wind spd.9   9   12  12  12  5   5   5   3   3   3   6

.TUESDAY...

Sky/weather.........Sunny.
Max temperature.....88-92.
Min humidity........25-29 percent.
Wind (20 ft)........
 Slope/valley.......Light and variable winds becoming south up to
6 mph late in the afternoon.
 Ridgetop...........Northwest around 6 mph shifting to the east
                    early in the morning, then shifting to the
                    south 3 to 9 mph late in the morning.
Mixing height.......3700 ft AGL.
Transport winds.....Northwest around 6 mph shifting to the east
                    early in the morning, then shifting to the
                    south 3 to 9 mph late in the morning.
CWR.................0 percent.
Chance of thunder...0 percent.

TIME (PDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky cover.......CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............61  61  63  67  72  77  81  84  87  89  90  89
RH..............68  68  66  59  51  43  38  35  32  29  27  27
SL/VL wind dir..N   N   NE  NE  NE  SE  SE  SE  S   S   S   S
SL/VL wind spd..0   0   2   2   2   2   2   2   5   5   5   6
SL/VL wind gust.3   3   6   6   6   7   7   7   10  10  10  13
Ridge wind dir..NW  NW  E   E   E   S   S   S   S   S   S   S
Ridge wind spd..6   6   6   6   6   3   3   3   7   7   7   9
Mix hgt (kft)...0.4 0.4 0.3 0.3 0.3 2.2 2.2 2.2 3.6 3.6 3.6 3.7
Transp wind dir.NW  NW  E   E   E   S   S   S   S   S   S   S
Transp wind spd.6   6   6   6   6   3   3   3   7   7   7   9

$$
Forecaster...SP
Requested by...Ryan Cash
Type of request...PRESCRIBED
.TAG 2622026.0/STO
.DELDT 09/20/26
.FormatterVersion 2.0.0
.EMAIL Ryan.cash@fire.ca.gov