NowOvercastTemperature 68°20°Rain chance 2%Wind 3 mph6 km/hSSETrack temperature 92°33°
OvercastTemperature 70°21°Rain chance 2%Wind 3 mph4 km/hSSETrack temperature 88°31°
OvercastTemperature 70°21°Rain chance 4%Wind 3 mph4 km/hSSETrack temperature 82°28°
OvercastTemperature 71°21°Rain chance 6%Wind 2 mph4 km/hSSWTrack temperature 76°24°
OvercastTemperature 65°19°Rain chance 19%Wind 7 mph11 km/hWNWTrack temperature 65°19°
OvercastTemperature 63°17°Rain chance 28%Wind 4 mph7 km/hWNWTrack temperature 63°17°
Light drizzleTemperature 62°16°Rain chance 58%Wind 4 mph7 km/hWNWTrack temperature 62°16°
Light rainTemperature 60°16°Rain chance 46%Wind 1 mph2 km/hWNWTrack temperature 60°16°
DrizzleTemperature 59°15°Rain chance 56%Wind 3 mph5 km/hNNWTrack temperature 59°15°
DrizzleTemperature 58°15°Rain chance 64%Wind 4 mph6 km/hNWTrack temperature 58°15°
OvercastTemperature 58°15°Rain chance 61%Wind 3 mph5 km/hNTrack temperature 58°15°
Heavy drizzleTemperature 58°14°Rain chance 66%Wind 3 mph5 km/hSSWTrack temperature 58°14°
DrizzleTemperature 58°14°Rain chance 67%Wind 2 mph4 km/hSTrack temperature 58°14°
Light drizzleTemperature 57°14°Rain chance 70%Wind 4 mph6 km/hSTrack temperature 57°14°
DrizzleTemperature 58°14°Rain chance 76%Wind 5 mph8 km/hSTrack temperature 58°14°
Light drizzleTemperature 57°14°Rain chance 65%Wind 6 mph10 km/hSSETrack temperature 57°14°
OvercastTemperature 57°14°Rain chance 42%Wind 6 mph9 km/hSETrack temperature 57°14°
DrizzleTemperature 57°14°Rain chance 28%Wind 2 mph3 km/hSTrack temperature 57°14°
Light drizzleTemperature 56°14°Rain chance 23%Wind 5 mph7 km/hSTrack temperature 57°14°
Light drizzleTemperature 57°14°Rain chance 24%Wind 4 mph7 km/hSTrack temperature 59°15°
Heavy drizzleTemperature 57°14°Rain chance 26%Wind 6 mph9 km/hSSWTrack temperature 58°14°
DrizzleTemperature 57°14°Rain chance 25%Wind 9 mph15 km/hWTrack temperature 58°15°
OvercastTemperature 57°14°Rain chance 28%Wind 5 mph8 km/hNWTrack temperature 59°15°
OvercastTemperature 59°15°Rain chance 16%Wind 10 mph17 km/hWTrack temperature 66°19°
Hours in your time zone (the track's when they match). Track temperature is an estimate.
Pit box
The racer numbers
Density altitude2,610ft796mField elevation 1,467 ft
Air density1.134kg/m³92.6% of standard (RAD)
Water grains62grgrains per lb of dry air
Track temp (est.)92°F33°CDirt in 620 W/m² sun
Dew point53°F12°C58% humidity
Barometer29.85inHg1011hPaFalling over 3 h
SurfaceTackyTacky: some moisture in the top layer
Rain, last 48 h0.31in8mmat 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 3171°21°55°13° 64%Red flag
TomorrowNov 161°16°48°9° 76%Red flag
MonNov 269°21°46°8° 1%Green flag
TueNov 374°23°54°12° 1%Green flag
WedNov 476°25°52°11° 1%Green flag
ThuNov 576°24°58°15° 2%Green flag
FriNov 680°26°58°14° 2%Green flagpartial
Day
Flag
Sky
High / low
Rain
Gusts
Track temp
Density alt.
Sunrise · sunset
Today Oct 31
Red flagrain
Light rain
71°21°55°13°
64% 0.14 in3.6 mm
13 mph20 km/h NNW
94°34°
2,745 ft837 m
7:06 AM · 5:58 PM
Tomorrow Nov 1
Red flagrain
Heavy drizzle
61°16°48°9°
76% 0.26 in6.6 mm
28 mph46 km/h SW
76°25°
2,137 ft651 m
6:07 AM · 4:57 PM
Mon Nov 2
Green flag
Overcast
69°21°46°8°
1%
5 mph8 km/h N
94°35°
2,382 ft726 m
6:08 AM · 4:56 PM
Tue Nov 3
Green flag
Overcast
74°23°54°12°
1%
5 mph8 km/h NW
100°38°
2,749 ft838 m
6:09 AM · 4:55 PM
Wed Nov 4
Green flag
Clear
76°25°52°11°
1%
6 mph10 km/h N
98°37°
3,037 ft926 m
6:10 AM · 4:54 PM
Thu Nov 5
Green flag
Overcast
76°24°58°15°
2%
4 mph6 km/h NNW
96°36°
2,982 ft909 m
6:11 AM · 4:53 PM
Fri Nov 6
Green flag
Clear
80°26°58°14°
2%
6 mph10 km/h NNW
102°39°
3,137 ft956 m
6:11 AM · 4:53 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
68°20°
53°12°
58%
29.85 inHg1011 hPa
2,610 ft796 m
1.134
62
92°33°
3 mph6 km/h SSE
2%
70°21°
50°10°
49%
29.85 inHg1011 hPa
2,702 ft824 m
1.131
56
88°31°
3 mph4 km/h SSE
2%
70°21°
47°9°
44%
29.83 inHg1010 hPa
2,736 ft834 m
1.130
51
82°28°
3 mph4 km/h SSE
4%
71°21°
45°7°
40%
29.82 inHg1010 hPa
2,745 ft837 m
1.130
47
76°24°
2 mph4 km/h SSW
6%
65°19°
51°11°
60%
29.87 inHg1012 hPa
2,409 ft734 m
1.141
59
65°19°
7 mph11 km/h WNW
19%
63°17°
53°12°
71%
29.90 inHg1013 hPa
2,253 ft687 m
1.146
64
63°17°
4 mph7 km/h WNW · gusts 13 mph20 km/h
28%
62°16°
56°13°
82%
29.91 inHg1013 hPa
2,175 ft663 m
1.149
70
62°16°
4 mph7 km/h WNW · gusts 12 mph20 km/h
58%
60°16°
57°14°
89%
29.91 inHg1013 hPa
2,111 ft643 m
1.151
74
60°16°
1 mph2 km/h WNW
46%
59°15°
57°14°
93%
29.88 inHg1012 hPa
2,052 ft625 m
1.153
73
59°15°
3 mph5 km/h NNW
56%
58°15°
57°14°
94%
29.88 inHg1012 hPa
2,021 ft616 m
1.154
72
58°15°
4 mph6 km/h NW
64%
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 Perris
Pit box, all week
Every forecast hour for the next seven days at Perris: 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 Perris, and a heads-up three days out.
OvercastTemperature 65°19°Rain chance 19%Wind 7 mph11 km/hWNWTrack temperature 65°19°
Light drizzleTemperature 62°16°Rain chance 58%Wind 4 mph7 km/hWNWTrack temperature 62°16°
Light rainTemperature 60°16°Rain chance 46%Wind 1 mph2 km/hWNWTrack temperature 60°16°
71°21° 55°13° 64%Red flag
76°25° 52°11° 1%Green flag