NowOvercastTemperature 64°18°Rain chance 5%Wind 11 mph18 km/hSTrack temperature 78°25°
OvercastTemperature 65°18°Rain chance 6%Wind 12 mph20 km/hSTrack temperature 75°24°
OvercastTemperature 64°18°Rain chance 7%Wind 12 mph20 km/hSSETrack temperature 73°23°
OvercastTemperature 63°17°Rain chance 6%Wind 11 mph18 km/hSTrack temperature 68°20°
OvercastTemperature 60°16°Rain chance 7%Wind 9 mph14 km/hSTrack temperature 60°16°
OvercastTemperature 57°14°Rain chance 8%Wind 5 mph9 km/hSSWTrack temperature 57°14°
OvercastTemperature 55°13°Rain chance 9%Wind 5 mph8 km/hNNWTrack temperature 55°13°
OvercastTemperature 52°11°Rain chance 6%Wind 3 mph5 km/hNETrack temperature 52°11°
OvercastTemperature 50°10°Rain chance 4%Wind 3 mph4 km/hNNETrack temperature 50°10°
Partly cloudyTemperature 49°9°Rain chance 4%Wind 3 mph5 km/hNWTrack temperature 49°9°
ClearTemperature 47°9°Rain chance 4%Wind 6 mph9 km/hWNWTrack temperature 47°9°
ClearTemperature 46°8°Rain chance 4%Wind 5 mph8 km/hNWTrack temperature 46°8°
Mostly clearTemperature 45°7°Rain chance 4%Wind 5 mph8 km/hNWTrack temperature 45°7°
ClearTemperature 44°7°Rain chance 5%Wind 4 mph7 km/hNWTrack temperature 44°7°
ClearTemperature 43°6°Rain chance 4%Wind 3 mph5 km/hNWTrack temperature 43°6°
Partly cloudyTemperature 44°7°Rain chance 3%Wind 3 mph5 km/hNWTrack temperature 44°7°
ClearTemperature 43°6°Rain chance 3%Wind 2 mph4 km/hNWTrack temperature 43°6°
ClearTemperature 42°6°Rain chance 3%Wind 3 mph4 km/hNNWTrack temperature 42°6°
ClearTemperature 41°5°Rain chance 3%Wind 1 mph1 km/hNWTrack temperature 41°5°
ClearTemperature 46°8°Rain chance 2%Wind 1 mph2 km/hSSETrack temperature 52°11°
ClearTemperature 54°12°Rain chance 1%Wind 3 mph6 km/hNNWTrack temperature 67°20°
ClearTemperature 62°17°Rain chance 1%Wind 8 mph13 km/hNNWTrack temperature 78°26°
ClearTemperature 66°19°Rain chance 1%Wind 9 mph14 km/hNNWTrack temperature 85°30°
ClearTemperature 68°20°Rain chance 0%Wind 9 mph14 km/hNNWTrack temperature 89°32°
Hours in your time zone (the track's when they match). Track temperature is an estimate.
Pit box
The racer numbers
Density altitude1,048ft319mField elevation 430 ft
Air density1.188kg/m³97.0% of standard (RAD)
Water grains44grgrains per lb of dry air
Track temp (est.)78°F25°CAsphalt in 397 W/m² sun
Dew point45°F7°C49% humidity
Barometer29.87inHg1012hPaSteady over 3 h
Computed from the forecast air temperature, dew point and station pressure (NWS formulas). Track temperature is estimated from sun, wind and the surface; it is not a sensor reading. How these are figured.
This week
Day by day
TodayOct 3165°18°49°9° 10%Green flag
TomorrowNov 171°22°41°5° 5%Green flag
MonNov 267°20°45°7° 5%Green flag
TueNov 351°10°44°7° 29%Green flag
WedNov 472°22°41°5° 9%Green flag
ThuNov 577°25°46°8° 5%Green flag
FriNov 679°26°50°10° 5%Green flagpartial
Day
Flag
Sky
High / low
Rain
Gusts
Track temp
Density alt.
Sunrise · sunset
Today Oct 31
Green flag
Overcast
65°18°49°9°
10%
19 mph30 km/h SSW
78°25°
1,063 ft324 m
7:36 AM · 6:08 PM
Tomorrow Nov 1
Green flag
Overcast
71°22°41°5°
5%
13 mph20 km/h NNW
91°33°
1,388 ft423 m
6:37 AM · 5:07 PM
Mon Nov 2
Green flag
Overcast
67°20°45°7°
5%
7 mph11 km/h SSE
91°33°
932 ft284 m
6:39 AM · 5:06 PM
Tue Nov 3
Green flag
Drizzle
51°10°44°7°
29% 0.06 in1.4 mm
6 mph9 km/h NNE
62°16°
-180 ft-55 m
6:40 AM · 5:05 PM
Wed Nov 4
Green flag
Overcast
72°22°41°5°
9%
18 mph30 km/h N
91°33°
1,383 ft422 m
6:41 AM · 5:04 PM
Thu Nov 5
Green flag
Partly cloudy
77°25°46°8°
5%
19 mph30 km/h NNE
107°42°
1,743 ft531 m
6:42 AM · 5:03 PM
Fri Nov 6
Green flag
Overcast
79°26°50°10°
5%
6 mph9 km/h N
104°40°
1,775 ft541 m
6:43 AM · 5:01 PM
Flags judge the racing hours, 9 am to 10 pm at the track. Days marked partial are at the edge of the forecast.
Today’s remaining 10 hours are free. Pro members get all seven days and the CSV.
Hour
Air
Dew pt
Humidity
Barometer
Density alt.
Air density kg/m³
Grains
Track temp (est.)
Wind
Rain
64°18°
45°7°
49%
29.87 inHg1012 hPa
1,048 ft319 m
1.188
44
78°25°
11 mph18 km/h S
5%
65°18°
42°5°
43%
29.88 inHg1012 hPa
1,063 ft324 m
1.187
40
75°24°
12 mph20 km/h S
6%
64°18°
42°6°
45%
29.85 inHg1011 hPa
1,046 ft319 m
1.188
40
73°23°
12 mph20 km/h SSE
7%
63°17°
42°5°
46%
29.85 inHg1011 hPa
980 ft299 m
1.190
40
68°20°
11 mph18 km/h S · gusts 18 mph30 km/h
6%
60°16°
41°5°
50%
29.85 inHg1011 hPa
785 ft239 m
1.197
39
60°16°
9 mph14 km/h S · gusts 19 mph30 km/h
7%
57°14°
40°5°
54%
29.85 inHg1011 hPa
597 ft182 m
1.204
38
57°14°
5 mph9 km/h SSW
8%
55°13°
40°4°
57%
29.84 inHg1011 hPa
449 ft137 m
1.209
37
55°13°
5 mph8 km/h NNW
9%
52°11°
38°4°
59%
29.84 inHg1011 hPa
276 ft84 m
1.215
35
52°11°
3 mph5 km/h NE
6%
50°10°
40°4°
68%
29.85 inHg1011 hPa
131 ft40 m
1.220
37
50°10°
3 mph4 km/h NNE
4%
49°9°
40°4°
70%
29.84 inHg1010 hPa
75 ft23 m
1.222
36
49°9°
3 mph5 km/h NW
4%
Every hour from the forecast, the same arithmetic as the pit box above (NWS density-altitude formula; track temperature is an estimate). Hours in your time zone, the track’s when they match.
Raceway Weather Pro
Plan the whole week at Shasta
Pit box, all week
Every forecast hour for the next seven days at Shasta: density altitude, air density, grains, track temp and more, with a CSV for the tuning laptop.
Do the models agree?
ECMWF, GFS and ICON side by side for the next three racing days, so you know when the forecast is shaky.
Next 6 hours of rain
Rain in 15-minute steps for the next six hours at your tracks, refreshed every hour.
Alerts for your tracks
An email the morning a red or yellow flag is due at Shasta, and a heads-up three days out.
OvercastTemperature 57°14°Rain chance 8%Wind 5 mph9 km/hSSWTrack temperature 57°14°
Partly cloudyTemperature 49°9°Rain chance 4%Wind 3 mph5 km/hNWTrack temperature 49°9°
ClearTemperature 47°9°Rain chance 4%Wind 6 mph9 km/hWNWTrack temperature 47°9°
ClearTemperature 41°5°Rain chance 3%Wind 1 mph1 km/hNWTrack temperature 41°5°
51°10° 44°7° 29%Green flag
77°25° 46°8° 5%Green flag