NowOvercastTemperature 61°16°Rain chance 4%Wind 7 mph12 km/hSETrack temperature 64°18°
OvercastTemperature 62°17°Rain chance 5%Wind 8 mph13 km/hSSETrack temperature 66°19°
OvercastTemperature 62°17°Rain chance 4%Wind 8 mph12 km/hSSETrack temperature 64°18°
OvercastTemperature 62°17°Rain chance 5%Wind 7 mph12 km/hSETrack temperature 67°20°
OvercastTemperature 59°15°Rain chance 3%Wind 5 mph8 km/hSETrack temperature 59°15°
OvercastTemperature 56°13°Rain chance 2%Wind 6 mph9 km/hESETrack temperature 56°13°
OvercastTemperature 56°14°Rain chance 2%Wind 6 mph10 km/hESETrack temperature 56°14°
OvercastTemperature 56°14°Rain chance 2%Wind 7 mph11 km/hESETrack temperature 56°14°
OvercastTemperature 55°13°Rain chance 2%Wind 7 mph12 km/hETrack temperature 55°13°
Partly cloudyTemperature 54°12°Rain chance 1%Wind 7 mph12 km/hETrack temperature 54°12°
Mostly clearTemperature 54°12°Rain chance 2%Wind 7 mph11 km/hETrack temperature 54°12°
ClearTemperature 53°12°Rain chance 1%Wind 7 mph11 km/hETrack temperature 53°12°
ClearTemperature 52°11°Rain chance 2%Wind 6 mph10 km/hETrack temperature 52°11°
OvercastTemperature 47°9°Rain chance 2%Wind 4 mph6 km/hWNWTrack temperature 47°9°
OvercastTemperature 47°8°Rain chance 2%Wind 4 mph6 km/hNNWTrack temperature 47°8°
Mostly clearTemperature 47°8°Rain chance 2%Wind 5 mph9 km/hNNWTrack temperature 47°8°
ClearTemperature 46°8°Rain chance 2%Wind 5 mph8 km/hNTrack temperature 46°8°
ClearTemperature 45°7°Rain chance 2%Wind 5 mph8 km/hNNWTrack temperature 45°7°
ClearTemperature 44°7°Rain chance 2%Wind 4 mph7 km/hNNWTrack temperature 45°7°
ClearTemperature 50°10°Rain chance 2%Wind 5 mph9 km/hNWTrack temperature 54°12°
ClearTemperature 57°14°Rain chance 1%Wind 8 mph12 km/hNWTrack temperature 66°19°
ClearTemperature 62°17°Rain chance 1%Wind 11 mph17 km/hNWTrack temperature 75°24°
ClearTemperature 65°19°Rain chance 1%Wind 12 mph19 km/hNWTrack temperature 81°27°
ClearTemperature 68°20°Rain chance 1%Wind 12 mph19 km/hNWTrack temperature 84°29°
Hours in your time zone (the track's when they match). Track temperature is an estimate.
Pit box
The racer numbers
Density altitude559ft170mField elevation 207 ft
Air density1.205kg/m³98.4% of standard (RAD)
Water grains43grgrains per lb of dry air
Track temp (est.)64°F18°CDirt in 93 W/m² sun
Dew point44°F7°C53% humidity
Barometer29.89inHg1012hPaSteady 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 3162°17°51°10° 5%Green flag
TomorrowNov 171°22°44°7° 2%Green flag
MonNov 267°19°48°9° 3%Green flag
TueNov 355°13°47°9° 19%Red flag
WedNov 472°22°45°7° 10%Green flag
ThuNov 574°23°51°11° 4%Green flag
FriNov 676°24°54°12° 6%Green flagpartial
Day
Flag
Sky
High / low
Rain
Gusts
Track temp
Density alt.
Sunrise · sunset
Today Oct 31
Green flag
Overcast
62°17°51°10°
5%
17 mph28 km/h SE
70°21°
659 ft201 m
7:33 AM · 6:08 PM
Tomorrow Nov 1
Green flag
Clear
71°22°44°7°
2%
19 mph31 km/h NNW
86°30°
1,104 ft336 m
6:34 AM · 5:06 PM
Mon Nov 2
Green flag
Overcast
67°19°48°9°
3%
7 mph11 km/h ESE
85°29°
625 ft190 m
6:35 AM · 5:05 PM
Tue Nov 3
Red flagrain
Light rain
55°13°47°9°
19% 0.14 in3.5 mm
20 mph32 km/h ENE
58°15°
-170 ft-52 m
6:37 AM · 5:04 PM
Wed Nov 4
Green flag
Overcast
72°22°45°7°
10%
7 mph11 km/h N
90°32°
1,085 ft331 m
6:38 AM · 5:03 PM
Thu Nov 5
Green flag
Partly cloudy
74°23°51°11°
4%
4 mph7 km/h ENE
95°35°
1,245 ft379 m
6:39 AM · 5:02 PM
Fri Nov 6
Green flag
Overcast
76°24°54°12°
6%
5 mph8 km/h N
94°34°
1,297 ft395 m
6:40 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
61°16°
44°7°
53%
29.89 inHg1012 hPa
559 ft170 m
1.205
43
64°18°
7 mph12 km/h SE · gusts 16 mph25 km/h
4%
62°17°
44°7°
51%
29.88 inHg1012 hPa
646 ft197 m
1.202
43
66°19°
8 mph13 km/h SSE · gusts 15 mph24 km/h
5%
62°17°
43°6°
49%
29.86 inHg1011 hPa
659 ft201 m
1.202
41
64°18°
8 mph12 km/h SSE · gusts 15 mph24 km/h
4%
62°17°
42°5°
47%
29.86 inHg1011 hPa
654 ft199 m
1.202
39
67°20°
7 mph12 km/h SE · gusts 15 mph23 km/h
5%
59°15°
38°4°
47%
29.85 inHg1011 hPa
408 ft124 m
1.210
35
59°15°
5 mph8 km/h SE · gusts 14 mph22 km/h
3%
56°13°
38°3°
50%
29.84 inHg1011 hPa
259 ft79 m
1.216
34
56°13°
6 mph9 km/h ESE
2%
56°14°
35°1°
44%
29.83 inHg1010 hPa
269 ft82 m
1.215
30
56°14°
6 mph10 km/h ESE
2%
56°14°
35°2°
45%
29.83 inHg1010 hPa
268 ft82 m
1.215
30
56°14°
7 mph11 km/h ESE
2%
55°13°
35°2°
47%
29.83 inHg1010 hPa
216 ft66 m
1.217
31
55°13°
7 mph12 km/h E
2%
54°12°
37°3°
52%
29.81 inHg1010 hPa
155 ft47 m
1.219
32
54°12°
7 mph12 km/h E
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 Chico
Pit box, all week
Every forecast hour for the next seven days at Chico: 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 Chico, and a heads-up three days out.
OvercastTemperature 56°13°Rain chance 2%Wind 6 mph9 km/hESETrack temperature 56°13°
Partly cloudyTemperature 54°12°Rain chance 1%Wind 7 mph12 km/hETrack temperature 54°12°
Mostly clearTemperature 54°12°Rain chance 2%Wind 7 mph11 km/hETrack temperature 54°12°
ClearTemperature 44°7°Rain chance 2%Wind 4 mph7 km/hNNWTrack temperature 45°7°
55°13° 47°9° 19%Red flag
74°23° 51°11° 4%Green flag