Race-day weather · Wyndo for runners
Rock 'n' Roll Arizona weather
January 17, 2027 · Tempe, AZ · traditional start around 7:15 AM (America/Phoenix) — not yet confirmed for 2027. What the start usually feels like, year by year — and a live start-time read once the race confirms its schedule and race week arrives.
Countdown
144 days to race day
The live race-day forecast unlocks 138 days from now, when January 17, 2027 enters the 7-day forecast window. Until then, live hourly data is not available; the history below shows what race morning usually looks like.
The 2027 schedule hasn't been published yet — both the date and start time shown here are carried from earlier editions and aggregators. We'll switch on the live start-time read when the race posts its schedule.
Typical start temp
44°F
median of 13 years
A warm year
44°F
75th percentile start temp
Rain at the start
8%
1 of 13 measured years
Race-morning weather history
Desert-winter MLK-weekend morning race: dry air, cold starts warming fast in sun. 2021 cancelled (COVID); the discontinued marathon ran a different Phoenix-start course. Wyndo tracks what past editions of the race actually served up at the start hour — temperature, dew point, wind, and rain, and reads the live forecast for the start once the race confirms its schedule and race week arrives.
Median start temp
44°F
p75 (a warm year): 44°F
Median dew point
28°F
at the start hour
Rain at the start
8%
1 of 13 measured years
Warmest start
53°F
in 2023
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2026 | 44°F | 27°F | 7 mph | dry | 75°F |
| 2025 | 37°F | 16°F | 7 mph | dry | 64°F |
| 2024 | 40°F | 27°F | 3 mph | dry | 65°F |
| 2023 | 53°F | 47°F | 2 mph | 0.7 mm | 61°F |
| 2022 | 43°F | 25°F | 6 mph | dry | 72°F |
| 2020 | 44°F | 28°F | 8 mph | dry | 75°F |
| 2019 | 44°F | 38°F | 6 mph | dry | 71°F |
| 2018 | 47°F | 32°F | 7 mph | dry | 78°F |
| 2017 | 52°F | 49°F | 4 mph | dry | 59°F |
| 2016 | 40°F | 36°F | 4 mph | dry | 65°F |
| 2015 | 44°F | 38°F | 5 mph | dry | 74°F |
| 2014 | 42°F | 25°F | 7 mph | dry | 75°F |
| 2013 | 41°F | 24°F | 7 mph | dry | 75°F |
Each row is the weather at a real past edition's date and this race's current start hour (ERA5 reanalysis at the start line).
Your heat-adjusted goal for the half marathon
The same cited model as the full calculator, pointed at this race: the median start-hour conditions this calendar slot has served up — climatology, not a forecast.
Your race-day brief
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Race facts
- Start line
- Half-marathon start: Mill Avenue at 3rd Street, downtown Tempe (per Tempe Tourism 2026 listing, consistent with the official road-closure guide). Coordinates geocoded from the intersection — approximate. 10K and 5K start elsewhere nearby.
- Traditional start (not confirmed for 2027)
- 7:15 AM (America/Phoenix) — Half 7:15 AM MST carried from the 2026 edition (aggregator-reported, matching the 2025 time from the Downtown Tempe Authority); wave start behind that gun. 5K runs Saturday. No wheelchair/elite gun published. 2027 times unpublished as of 2026-08-26.
- Field size
- null: the event no longer holds a marathon (last full ~Jan 2023), so no marathon finisher count exists; the 2026 half-marathon count was not verified.
- Registration
- open (registration open as of 2026-08-26)
Wyndo is not affiliated with or endorsed by the Rock 'n' Roll Arizona (officially the "Paradox Rock 'n' Roll Running Series Arizona") or its organizers. Race names are used descriptively to identify the event; schedules and start times belong to the race — always confirm details on the official site. Weather guidance here is informational, never medical advice, and event alert flags on race day belong to the race's own medical team.