NowOvercastTemperature 64°18°Rain chance 65%Wind 6 mph9 km/hSETrack temperature 67°19°
Light rainTemperature 63°17°Rain chance 79%Wind 4 mph7 km/hENETrack temperature 63°17°
Light rainTemperature 62°17°Rain chance 63%Wind 7 mph11 km/hETrack temperature 63°17°
Light drizzleTemperature 62°17°Rain chance 61%Wind 6 mph10 km/hENETrack temperature 62°17°
DrizzleTemperature 62°17°Rain chance 37%Wind 5 mph8 km/hENETrack temperature 62°17°
RainTemperature 62°17°Rain chance 39%Wind 3 mph6 km/hETrack temperature 62°17°
OvercastTemperature 61°16°Rain chance 36%Wind 7 mph12 km/hESETrack temperature 61°16°
OvercastTemperature 61°16°Rain chance 27%Wind 8 mph12 km/hESETrack temperature 61°16°
OvercastTemperature 61°16°Rain chance 19%Wind 6 mph10 km/hESETrack temperature 61°16°
OvercastTemperature 61°16°Rain chance 24%Wind 6 mph9 km/hESETrack temperature 61°16°
DrizzleTemperature 61°16°Rain chance 31%Wind 4 mph7 km/hESETrack temperature 61°16°
OvercastTemperature 61°16°Rain chance 13%Wind 6 mph9 km/hESETrack temperature 61°16°
OvercastTemperature 61°16°Rain chance 9%Wind 4 mph7 km/hESETrack temperature 61°16°
OvercastTemperature 61°16°Rain chance 3%Wind 5 mph9 km/hSETrack temperature 61°16°
OvercastTemperature 60°16°Rain chance 3%Wind 5 mph7 km/hSETrack temperature 60°16°
OvercastTemperature 62°17°Rain chance 3%Wind 2 mph4 km/hESETrack temperature 62°17°
Partly cloudyTemperature 61°16°Rain chance 2%Wind 2 mph3 km/hSSETrack temperature 61°16°
OvercastTemperature 62°17°Rain chance 2%Wind 1 mph2 km/hSSETrack temperature 64°18°
OvercastTemperature 64°18°Rain chance 2%Wind 1 mph2 km/hWSWTrack temperature 71°22°
OvercastTemperature 66°19°Rain chance 2%Wind 1 mph2 km/hESETrack temperature 79°26°
OvercastTemperature 66°19°Rain chance 2%Wind 3 mph4 km/hSTrack temperature 73°23°
OvercastTemperature 66°19°Rain chance 1%Wind 2 mph4 km/hSTrack temperature 69°21°
OvercastTemperature 68°20°Rain chance 1%Wind 1 mph1 km/hSSETrack temperature 77°25°
OvercastTemperature 70°21°Rain chance 1%Wind 2 mph4 km/hSWTrack temperature 82°28°
Hours in your time zone (the track's when they match). Track temperature is an estimate.
Pit box
The racer numbers
Density altitude1,625ft495mField elevation 1,079 ft
Air density1.168kg/m³95.3% of standard (RAD)
Water grains77grgrains per lb of dry air
Track temp (est.)67°F19°CDirt in 77 W/m² sun
Dew point59°F15°C84% humidity
Barometer30.14inHg1021hPaFalling over 3 h
SurfaceTackyTacky: some moisture in the top layer
Rain, last 48 h0.1in2.6mmat the track
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 3166°19°60°16° 79%Red flag
TomorrowNov 170°21°60°16° 31%Green flag
MonNov 276°25°60°16° 58%Yellow flag
TueNov 370°21°54°12° 87%Green flag
WedNov 471°22°50°10° 9%Green flag
ThuNov 571°22°55°13° 10%Green flag
FriNov 664°18°50°10° 4%Green flagpartial
Day
Flag
Sky
High / low
Rain
Gusts
Track temp
Density alt.
Sunrise · sunset
Today Oct 31
Red flagrain
Rain
66°19°60°16°
79% 0.57 in14.5 mm
15 mph24 km/h E
77°25°
1,685 ft514 m
7:39 AM · 6:25 PM
Tomorrow Nov 1
Green flag
Overcast
70°21°60°16°
31% 0.03 in0.7 mm
13 mph22 km/h SE
82°28°
1,989 ft606 m
6:40 AM · 5:23 PM
Mon Nov 2
Yellow flaggusty wind
Light drizzle
76°25°60°16°
58% 0.02 in0.6 mm
45 mph73 km/h SSE
87°30°
2,825 ft861 m
6:41 AM · 5:22 PM
Tue Nov 3
Green flag
Overcast
70°21°54°12°
87% 1.37 in34.8 mm
42 mph67 km/h SW
92°33°
2,302 ft702 m
6:42 AM · 5:21 PM
Wed Nov 4
Green flag
Clear
71°22°50°10°
9%
6 mph9 km/h NE
96°36°
2,271 ft692 m
6:43 AM · 5:21 PM
Thu Nov 5
Green flag
Light drizzle
71°22°55°13°
10% 0.02 in0.6 mm
14 mph22 km/h SE
88°31°
2,315 ft706 m
6:44 AM · 5:20 PM
Fri Nov 6
Green flag
Overcast
64°18°50°10°
4%
21 mph33 km/h NNE
82°28°
1,818 ft554 m
6:45 AM · 5:19 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 8 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°
59°15°
84%
30.14 inHg1021 hPa
1,625 ft495 m
1.168
77
67°19°
6 mph9 km/h SE · gusts 14 mph22 km/h
65%
63°17°
60°16°
91%
30.16 inHg1021 hPa
1,530 ft466 m
1.171
80
63°17°
4 mph7 km/h ENE
79%
62°17°
60°16°
94%
30.15 inHg1021 hPa
1,505 ft459 m
1.172
81
63°17°
7 mph11 km/h E · gusts 15 mph23 km/h
63%
62°17°
61°16°
95%
30.16 inHg1021 hPa
1,488 ft454 m
1.173
82
62°17°
6 mph10 km/h ENE · gusts 15 mph24 km/h
61%
62°17°
60°16°
94%
30.15 inHg1021 hPa
1,479 ft451 m
1.173
80
62°17°
5 mph8 km/h ENE · gusts 14 mph22 km/h
37%
62°17°
60°16°
94%
30.16 inHg1021 hPa
1,455 ft443 m
1.174
79
62°17°
3 mph6 km/h E · gusts 14 mph23 km/h
39%
61°16°
59°15°
92%
30.16 inHg1021 hPa
1,418 ft432 m
1.175
76
61°16°
7 mph12 km/h ESE · gusts 14 mph23 km/h
36%
61°16°
58°14°
90%
30.16 inHg1021 hPa
1,393 ft425 m
1.176
74
61°16°
8 mph12 km/h ESE
27%
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 Arrowhead
Pit box, all week
Every forecast hour for the next seven days at Arrowhead: 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 Arrowhead, and a heads-up three days out.
Light rainTemperature 63°17°Rain chance 79%Wind 4 mph7 km/hENETrack temperature 63°17°
Light drizzleTemperature 62°17°Rain chance 61%Wind 6 mph10 km/hENETrack temperature 62°17°
RainTemperature 62°17°Rain chance 39%Wind 3 mph6 km/hETrack temperature 62°17°
OvercastTemperature 61°16°Rain chance 36%Wind 7 mph12 km/hESETrack temperature 61°16°
Partly cloudyTemperature 61°16°Rain chance 2%Wind 2 mph3 km/hSSETrack temperature 61°16°
71°22° 50°10° 9%Green flag