NowOvercastTemperature 46°8°Rain chance 5%Wind 2 mph3 km/hETrack temperature 58°14°
Partly cloudyTemperature 46°8°Rain chance 1%Wind 4 mph7 km/hSETrack temperature 55°13°
OvercastTemperature 45°7°Rain chance 1%Wind 6 mph10 km/hESETrack temperature 51°10°
OvercastTemperature 42°6°Rain chance 1%Wind 3 mph5 km/hETrack temperature 42°6°
OvercastTemperature 40°5°Rain chance 1%Wind 2 mph4 km/hNETrack temperature 40°5°
OvercastTemperature 39°4°Rain chance 1%Wind 4 mph6 km/hNTrack temperature 39°4°
OvercastTemperature 38°3°Rain chance 1%Wind 2 mph3 km/hNNETrack temperature 38°3°
Partly cloudyTemperature 37°3°Rain chance 1%Wind 4 mph7 km/hNETrack temperature 37°3°
OvercastTemperature 36°2°Rain chance 1%Wind 5 mph8 km/hNNETrack temperature 36°2°
FogTemperature 35°2°Rain chance 1%Wind 1 mph1 km/hNNETrack temperature 35°2°
FogTemperature 37°3°Rain chance 1%Wind 2 mph3 km/hESETrack temperature 37°3°
FogTemperature 38°3°Rain chance 1%Wind 2 mph3 km/hNNWTrack temperature 38°3°
FogTemperature 38°3°Rain chance 1%Wind 3 mph4 km/hNNETrack temperature 38°3°
FogTemperature 38°4°Rain chance 2%Wind 2 mph3 km/hNNETrack temperature 38°4°
FogTemperature 39°4°Rain chance 3%Wind 3 mph5 km/hNNETrack temperature 39°4°
FogTemperature 40°4°Rain chance 3%Wind 1 mph1 km/hETrack temperature 40°4°
FogTemperature 40°4°Rain chance 3%Wind 1 mph2 km/hESETrack temperature 40°4°
FogTemperature 40°4°Rain chance 4%Wind 2 mph3 km/hENETrack temperature 40°4°
FogTemperature 40°5°Rain chance 3%Wind 2 mph4 km/hENETrack temperature 41°5°
FogTemperature 41°5°Rain chance 3%Wind 4 mph7 km/hENETrack temperature 43°6°
FogTemperature 42°5°Rain chance 3%Wind 4 mph7 km/hNETrack temperature 44°7°
FogTemperature 43°6°Rain chance 3%Wind 6 mph10 km/hENETrack temperature 46°8°
FogTemperature 44°6°Rain chance 7%Wind 6 mph10 km/hENETrack temperature 47°8°
OvercastTemperature 45°7°Rain chance 9%Wind 6 mph9 km/hENETrack temperature 48°9°
Hours in your time zone (the track's when they match). Track temperature is an estimate.
Pit box
The racer numbers
Density altitude3,193ft973mField elevation 3,222 ft
Air density1.115kg/m³91.0% of standard (RAD)
Water grains44grgrains per lb of dry air
Track temp (est.)58°F14°CDirt in 296 W/m² sun
Dew point42°F5°C87% humidity
Barometer29.99inHg1016hPaSteady over 3 h
SurfaceDryDry, likely dusty: little rain in 48 h
Rain, last 48 h0.06in1.5mmat 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 3146°8°35°1° 50%Yellow flag
TomorrowNov 146°8°35°2° 66%Red flag
MonNov 258°14°43°6° 92%Green flag
TueNov 358°15°43°6° 0%Green flag
WedNov 454°12°43°6° 1%Green flag
ThuNov 561°16°43°6° 2%Yellow flag
FriNov 654°12°43°6° 7%Yellow flagpartial
Day
Flag
Sky
High / low
Rain
Gusts
Track temp
Density alt.
Sunrise · sunset
Today Oct 31
Yellow flagcold
Overcast
46°8°35°1°
50% 0.06 in1.5 mm
11 mph17 km/h E
58°14°
3,233 ft985 m
7:51 AM · 6:03 PM
Tomorrow Nov 1
Red flagrain
Drizzle
46°8°35°2°
66% 0.26 in6.5 mm
28 mph45 km/h NE
49°9°
3,353 ft1,022 m
6:53 AM · 5:01 PM
Mon Nov 2
Green flag
Overcast
58°14°43°6°
92% 0.1 in2.4 mm
30 mph48 km/h NW
72°22°
3,798 ft1,158 m
6:54 AM · 5:00 PM
Tue Nov 3
Green flag
Overcast
58°15°43°6°
0%
22 mph35 km/h WSW
68°20°
4,026 ft1,227 m
6:56 AM · 4:59 PM
Wed Nov 4
Green flag
Overcast
54°12°43°6°
1%
6 mph9 km/h NNW
65°18°
3,697 ft1,127 m
6:57 AM · 4:57 PM
Thu Nov 5
Yellow flaggusty wind
Overcast
61°16°43°6°
2%
27 mph43 km/h WSW
72°22°
4,130 ft1,259 m
6:58 AM · 4:56 PM
Fri Nov 6
Yellow flaggusty wind
Light drizzle
54°12°43°6°
7% 0.02 in0.4 mm
33 mph53 km/h WSW
59°15°
3,983 ft1,214 m
7:00 AM · 4:54 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 9 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
46°8°
42°5°
87%
29.99 inHg1016 hPa
3,193 ft973 m
1.115
44
58°14°
2 mph3 km/h E
5%
46°8°
42°6°
85%
30.01 inHg1016 hPa
3,233 ft985 m
1.113
45
55°13°
4 mph7 km/h SE
1%
45°7°
42°5°
87%
30.02 inHg1017 hPa
3,158 ft963 m
1.116
43
51°10°
6 mph10 km/h ESE
1%
42°6°
39°4°
88%
30.03 inHg1017 hPa
2,954 ft900 m
1.123
39
42°6°
3 mph5 km/h E
1%
40°5°
36°2°
85%
30.03 inHg1017 hPa
2,829 ft862 m
1.127
35
40°5°
2 mph4 km/h NE
1%
39°4°
36°2°
87%
30.04 inHg1017 hPa
2,749 ft838 m
1.129
34
39°4°
4 mph6 km/h N
1%
38°3°
35°1°
87%
30.04 inHg1017 hPa
2,668 ft813 m
1.132
33
38°3°
2 mph3 km/h NNE
1%
37°3°
34°1°
88%
30.03 inHg1017 hPa
2,632 ft802 m
1.133
32
37°3°
4 mph7 km/h NE
1%
36°2°
34°1°
91%
30.02 inHg1017 hPa
2,572 ft784 m
1.135
32
36°2°
5 mph8 km/h NNE
1%
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 Big Sky
Pit box, all week
Every forecast hour for the next seven days at Big Sky: 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 Big Sky, and a heads-up three days out.
Partly cloudyTemperature 46°8°Rain chance 1%Wind 4 mph7 km/hSETrack temperature 55°13°
OvercastTemperature 40°5°Rain chance 1%Wind 2 mph4 km/hNETrack temperature 40°5°
Partly cloudyTemperature 37°3°Rain chance 1%Wind 4 mph7 km/hNETrack temperature 37°3°
FogTemperature 35°2°Rain chance 1%Wind 1 mph1 km/hNNETrack temperature 35°2°
46°8° 35°2° 66%Red flag