NowOvercastTemperature 70°21°Rain chance 29%Wind 5 mph8 km/hSETrack temperature 79°26°
Mostly clearTemperature 73°23°Rain chance 24%Wind 4 mph6 km/hESETrack temperature 94°34°
Partly cloudyTemperature 71°21°Rain chance 28%Wind 7 mph12 km/hETrack temperature 77°25°
OvercastTemperature 70°21°Rain chance 26%Wind 5 mph9 km/hETrack temperature 74°23°
OvercastTemperature 67°19°Rain chance 25%Wind 8 mph13 km/hETrack temperature 67°19°
OvercastTemperature 66°19°Rain chance 23%Wind 11 mph18 km/hESETrack temperature 66°19°
OvercastTemperature 66°19°Rain chance 33%Wind 11 mph18 km/hESETrack temperature 66°19°
OvercastTemperature 67°19°Rain chance 37%Wind 12 mph19 km/hESETrack temperature 67°19°
OvercastTemperature 67°19°Rain chance 37%Wind 12 mph19 km/hESETrack temperature 67°19°
OvercastTemperature 66°19°Rain chance 33%Wind 8 mph14 km/hESETrack temperature 66°19°
OvercastTemperature 65°18°Rain chance 16%Wind 9 mph15 km/hESETrack temperature 65°18°
OvercastTemperature 65°19°Rain chance 14%Wind 7 mph11 km/hSETrack temperature 65°19°
OvercastTemperature 65°18°Rain chance 9%Wind 6 mph9 km/hESETrack temperature 65°18°
OvercastTemperature 65°18°Rain chance 7%Wind 8 mph13 km/hESETrack temperature 65°18°
OvercastTemperature 64°18°Rain chance 7%Wind 8 mph13 km/hETrack temperature 64°18°
OvercastTemperature 64°18°Rain chance 12%Wind 6 mph10 km/hESETrack temperature 64°18°
OvercastTemperature 64°18°Rain chance 18%Wind 7 mph11 km/hSETrack temperature 64°18°
OvercastTemperature 64°18°Rain chance 19%Wind 9 mph15 km/hESETrack temperature 64°18°
OvercastTemperature 65°18°Rain chance 21%Wind 9 mph15 km/hESETrack temperature 66°19°
OvercastTemperature 67°20°Rain chance 29%Wind 7 mph11 km/hESETrack temperature 73°23°
Light drizzleTemperature 69°20°Rain chance 42%Wind 8 mph13 km/hSWTrack temperature 74°23°
DrizzleTemperature 66°19°Rain chance 65%Wind 17 mph28 km/hSWTrack temperature 74°23°
RainTemperature 64°18°Rain chance 67%Wind 19 mph31 km/hSWTrack temperature 66°19°
DrizzleTemperature 64°18°Rain chance 87%Wind 16 mph25 km/hSWTrack temperature 69°21°
Hours in your time zone (the track's when they match). Track temperature is an estimate.
Pit box
The racer numbers
Density altitude4,505ft1,373mField elevation 3,009 ft
Air density1.071kg/m³87.5% of standard (RAD)
Water grains89grgrains per lb of dry air
Track temp (est.)79°F26°CAsphalt in 205 W/m² sun
Dew point61°F16°C72% humidity
Barometer29.96inHg1015hPaSteady over 3 h
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 3173°23°59°15° 37%Green flag
TomorrowNov 169°20°58°14° 92%Red flag
MonNov 265°18°53°12° 60%Green flag
TueNov 374°24°53°12° 0%Green flag
WedNov 475°24°58°14° 1%Green flag
ThuNov 574°23°59°15° 0%Green flag
FriNov 672°22°58°15° 5%Green flagpartial
Day
Flag
Sky
High / low
Rain
Gusts
Track temp
Density alt.
Sunrise · sunset
Today Oct 31
Green flag
Overcast
73°23°59°15°
37%
22 mph36 km/h ESE
94°34°
4,656 ft1,419 m
6:38 AM · 5:35 PM
Tomorrow Nov 1
Red flagrain, gusty wind
Rain
69°20°58°14°
92% 0.4 in10.1 mm
49 mph78 km/h S
74°23°
4,452 ft1,357 m
6:39 AM · 5:34 PM
Mon Nov 2
Green flag
Partly cloudy
65°18°53°12°
60% 0.07 in1.7 mm
21 mph33 km/h WNW
91°33°
4,013 ft1,223 m
6:39 AM · 5:33 PM
Tue Nov 3
Green flag
Clear
74°24°53°12°
0%
13 mph22 km/h ESE
98°37°
4,648 ft1,417 m
6:40 AM · 5:32 PM
Wed Nov 4
Green flag
Overcast
75°24°58°14°
1%
11 mph17 km/h ESE
105°41°
4,822 ft1,470 m
6:41 AM · 5:31 PM
Thu Nov 5
Green flag
Overcast
74°23°59°15°
0%
6 mph10 km/h E
99°37°
4,702 ft1,433 m
6:42 AM · 5:31 PM
Fri Nov 6
Green flag
Overcast
72°22°58°15°
5%
5 mph8 km/h W
96°36°
4,541 ft1,384 m
6:43 AM · 5:30 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
70°21°
61°16°
72%
29.96 inHg1015 hPa
4,505 ft1,373 m
1.071
89
79°26°
5 mph8 km/h SE
29%
73°23°
61°16°
66%
29.94 inHg1014 hPa
4,656 ft1,419 m
1.067
88
94°34°
4 mph6 km/h ESE
24%
71°21°
61°16°
72%
29.91 inHg1013 hPa
4,582 ft1,397 m
1.069
90
77°25°
7 mph12 km/h E
28%
70°21°
62°17°
77%
29.90 inHg1013 hPa
4,554 ft1,388 m
1.070
93
74°23°
5 mph9 km/h E
26%
67°19°
61°16°
81%
29.92 inHg1013 hPa
4,367 ft1,331 m
1.076
89
67°19°
8 mph13 km/h E
25%
66°19°
59°15°
77%
29.91 inHg1013 hPa
4,340 ft1,323 m
1.077
83
66°19°
11 mph18 km/h ESE
23%
66°19°
59°15°
76%
29.90 inHg1013 hPa
4,344 ft1,324 m
1.077
82
66°19°
11 mph18 km/h ESE
33%
67°19°
58°15°
75%
29.90 inHg1012 hPa
4,358 ft1,328 m
1.076
82
67°19°
12 mph19 km/h ESE
37%
67°19°
59°15°
76%
29.89 inHg1012 hPa
4,364 ft1,330 m
1.076
83
67°19°
12 mph19 km/h ESE
37%
66°19°
59°15°
78%
29.89 inHg1012 hPa
4,335 ft1,321 m
1.077
83
66°19°
8 mph14 km/h ESE
33%
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 Tucson
Pit box, all week
Every forecast hour for the next seven days at Tucson: 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 Tucson, and a heads-up three days out.
Mostly clearTemperature 73°23°Rain chance 24%Wind 4 mph6 km/hESETrack temperature 94°34°
Partly cloudyTemperature 71°21°Rain chance 28%Wind 7 mph12 km/hETrack temperature 77°25°
OvercastTemperature 67°19°Rain chance 25%Wind 8 mph13 km/hETrack temperature 67°19°
Light drizzleTemperature 69°20°Rain chance 42%Wind 8 mph13 km/hSWTrack temperature 74°23°
RainTemperature 64°18°Rain chance 67%Wind 19 mph31 km/hSWTrack temperature 66°19°