NowOvercastTemperature 69°20°Rain chance 2%Wind 6 mph9 km/hETrack temperature 73°23°
OvercastTemperature 69°20°Rain chance 3%Wind 5 mph8 km/hESETrack temperature 71°22°
OvercastTemperature 66°19°Rain chance 3%Wind 4 mph7 km/hNNETrack temperature 66°19°
OvercastTemperature 65°18°Rain chance 6%Wind 4 mph6 km/hNNETrack temperature 65°18°
OvercastTemperature 64°18°Rain chance 10%Wind 4 mph6 km/hNNWTrack temperature 64°18°
DrizzleTemperature 62°17°Rain chance 25%Wind 4 mph6 km/hNNWTrack temperature 62°17°
OvercastTemperature 62°17°Rain chance 21%Wind 4 mph7 km/hNTrack temperature 62°17°
OvercastTemperature 61°16°Rain chance 28%Wind 5 mph8 km/hNETrack temperature 61°16°
Heavy rainTemperature 60°16°Rain chance 39%Wind 2 mph3 km/hNWTrack temperature 60°16°
Heavy drizzleTemperature 61°16°Rain chance 51%Wind 3 mph4 km/hSETrack temperature 61°16°
Light drizzleTemperature 61°16°Rain chance 50%Wind 3 mph5 km/hSETrack temperature 61°16°
Heavy drizzleTemperature 61°16°Rain chance 31%Wind 2 mph3 km/hENETrack temperature 61°16°
OvercastTemperature 62°16°Rain chance 30%Wind 5 mph9 km/hSETrack temperature 62°16°
OvercastTemperature 61°16°Rain chance 27%Wind 4 mph7 km/hSSETrack temperature 61°16°
Partly cloudyTemperature 59°15°Rain chance 28%Wind 4 mph6 km/hSSETrack temperature 59°15°
OvercastTemperature 60°16°Rain chance 26%Wind 2 mph4 km/hENETrack temperature 60°16°
OvercastTemperature 60°16°Rain chance 17%Wind 4 mph6 km/hETrack temperature 60°16°
OvercastTemperature 62°16°Rain chance 15%Wind 8 mph13 km/hSETrack temperature 64°18°
OvercastTemperature 62°17°Rain chance 13%Wind 9 mph15 km/hSETrack temperature 65°18°
OvercastTemperature 62°17°Rain chance 12%Wind 9 mph15 km/hSETrack temperature 66°19°
OvercastTemperature 61°16°Rain chance 9%Wind 10 mph15 km/hSETrack temperature 64°18°
OvercastTemperature 61°16°Rain chance 6%Wind 9 mph14 km/hSETrack temperature 63°17°
OvercastTemperature 62°17°Rain chance 5%Wind 7 mph12 km/hSETrack temperature 67°20°
OvercastTemperature 62°17°Rain chance 5%Wind 8 mph13 km/hSETrack temperature 65°18°
Hours in your time zone (the track's when they match). Track temperature is an estimate.
Pit box
The racer numbers
Density altitude947ft289mField elevation 410 ft
Air density1.191kg/m³97.3% of standard (RAD)
Water grains47grgrains per lb of dry air
Track temp (est.)73°F23°CDirt in 131 W/m² sun
Dew point47°F8°C45% humidity
Barometer30.20inHg1023hPaSteady over 3 h
SurfaceDryDry, likely dusty: little rain in 48 h
Rain, last 48 h0.0in0mmat 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 3169°20°57°14° 28%Green flag
TomorrowNov 162°17°59°15° 51%Green flag
MonNov 269°21°59°15° 8%Yellow flag
TueNov 370°21°63°17° 67%Yellow flag
WedNov 472°22°55°13° 44%Green flag
ThuNov 571°21°50°10° 15%Green flag
FriNov 662°17°51°11° 8%Green flagpartial
Day
Flag
Sky
High / low
Rain
Gusts
Track temp
Density alt.
Sunrise · sunset
Today Oct 31
Green flag
Drizzle
69°20°57°14°
28% 0.03 in0.7 mm
13 mph21 km/h NNE
75°24°
959 ft292 m
7:25 AM · 6:04 PM
Tomorrow Nov 1
Green flag
Overcast
62°17°59°15°
51% 0.81 in20.6 mm
17 mph27 km/h SE
67°20°
524 ft160 m
6:26 AM · 5:03 PM
Mon Nov 2
Yellow flaggusty wind
Overcast
69°21°59°15°
8%
34 mph55 km/h SSE
74°24°
1,349 ft411 m
6:27 AM · 5:02 PM
Tue Nov 3
Yellow flaggusty wind
Drizzle
70°21°63°17°
67% 0.15 in3.9 mm
37 mph60 km/h S
73°23°
1,535 ft468 m
6:28 AM · 5:01 PM
Wed Nov 4
Green flag
Overcast
72°22°55°13°
44% 0.07 in1.9 mm
11 mph17 km/h WNW
90°32°
1,510 ft460 m
6:30 AM · 5:00 PM
Thu Nov 5
Green flag
Clear
71°21°50°10°
15%
4 mph7 km/h NNW
91°33°
1,390 ft424 m
6:31 AM · 4:59 PM
Fri Nov 6
Green flag
Overcast
62°17°51°11°
8%
11 mph18 km/h NW
71°22°
843 ft257 m
6:32 AM · 4:58 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
69°20°
47°8°
45%
30.20 inHg1023 hPa
947 ft289 m
1.191
47
73°23°
6 mph9 km/h E
2%
69°20°
48°9°
47%
30.21 inHg1023 hPa
931 ft284 m
1.192
49
71°22°
5 mph8 km/h ESE · gusts 13 mph21 km/h
3%
66°19°
47°8°
49%
30.24 inHg1024 hPa
753 ft230 m
1.198
47
66°19°
4 mph7 km/h NNE
3%
65°18°
48°9°
54%
30.25 inHg1025 hPa
656 ft200 m
1.202
49
65°18°
4 mph6 km/h NNE
6%
64°18°
50°10°
61%
30.27 inHg1025 hPa
598 ft182 m
1.204
54
64°18°
4 mph6 km/h NNW
10%
62°17°
53°12°
72%
30.26 inHg1025 hPa
500 ft152 m
1.207
60
62°17°
4 mph6 km/h NNW
25%
62°17°
54°12°
76%
30.27 inHg1025 hPa
485 ft148 m
1.208
63
62°17°
4 mph7 km/h N
21%
61°16°
55°13°
82%
30.27 inHg1025 hPa
410 ft125 m
1.210
65
61°16°
5 mph8 km/h NE
28%
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 I-55
Pit box, all week
Every forecast hour for the next seven days at I-55: 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 I-55, and a heads-up three days out.
OvercastTemperature 65°18°Rain chance 6%Wind 4 mph6 km/hNNETrack temperature 65°18°
DrizzleTemperature 62°17°Rain chance 25%Wind 4 mph6 km/hNNWTrack temperature 62°17°
Heavy rainTemperature 60°16°Rain chance 39%Wind 2 mph3 km/hNWTrack temperature 60°16°
Partly cloudyTemperature 59°15°Rain chance 28%Wind 4 mph6 km/hSSETrack temperature 59°15°
71°21° 50°10° 15%Green flag