Weather
Climate Avg| Time | Temp | Dew Pt | Humidity | Wind | Conditions |
|---|---|---|---|---|---|
| Start | 52.8 – 52.8°F | 43° Ideal | 70 – 70% | 7 mph N | Partly cloudy |
| 8:00 AM | 52.9 – 52.9°F | 42° Ideal | 67 – 67% | 6 mph N | Partly cloudy |
| Finish | 70.9 – 75.6°F | 69° Steamy | 78 – 95% | 7 mph NE | Clear sky |
Based on 3-year average for this date. Real forecast available in 218 days.
Elevation Profile
Course Stats
Mile Splits
| Mile | Grade |
|---|---|
| 1 | +0.0% |
| 2 | +0.0% |
| 3 | +0.1% |
| 4 | -0.1% |
| 5 | +0.5% |
| 6 | -0.5% |
| 7 | -0.1% |
| 8 | +0.0% |
| 9 | -0.2% |
| 10 | +0.0% |
| 11 | +0.6% |
| 12 | -0.6% |
| 13 | -0.1% |
| 14 | +0.0% |
RM Difficulty Index
Race-Day Weather History
Race-morning conditions on this date over the past 5 years: median 62°F with a 59°F dew point and 10 mph wind. 3 of 5 years were warm enough to slow race pace.
| Year | Temp | Dew Pt | Wind | Rain | Sky |
|---|---|---|---|---|---|
| 2023 | 73°F | 68°F | 5 mph | — | Clear |
| 2021 | 62°F | 59°F | 13 mph | — | Partly cloudy |
| 2020 | 61°F | 38°F | 16 mph | — | Partly cloudy |
| 2019 | 61°F | 52°F | 7 mph | — | Clear |
| 2018 | 71°F | 62°F | 10 mph | — | Partly cloudy |
Morning conditions (race window) on the 305 Half Marathon calendar date each year, from the ERA5 reanalysis archive — the race’s usual slot, not necessarily each edition’s exact day.
305 Half Marathon Pace Calculator & Race Plan
The 305 Half runs through Miami Beach and South Beach on a flat course. Like all Miami races, humidity is the primary challenge. November is slightly less brutal than January but still tropical.
Our splits factor in the dew point and temperature to give you realistic pacing for the conditions.
305 Half Marathon FAQ
When is the next 305 Half Marathon?›
The next 305 Half Marathon is on Sunday, March 7, 2027.
How long is the 305 Half Marathon?›
The 305 Half Marathon is 13.1 miles (21.097 km), the standard half marathon distance. It runs in Miami, FL.
How much elevation gain does the 305 Half Marathon have?›
The 305 Half Marathon has about 209 ft (64 m) of climbing and 225 ft of descent, with a maximum grade of 6.8%.
Is the 305 Half Marathon flat, downhill, or hilly?›
The 305 Half Marathon starts and finishes at roughly the same elevation (net -5 m). With 209 ft of total climbing along the way, it's a fast, flat course.
How hard is the 305 Half Marathon?›
Runner's Math scores the 305 Half Marathon 33/100 (Moderate) — #11 of 16 half marathons in our library, ranked by modeled time cost. The profile costs about 0:18 versus a flat course for a runner at 4:00-marathon pace.
What's the weather usually like at the 305 Half Marathon?›
Over the past 5 years on this date, median race-morning conditions were 62°F with a 59°F dew point and 10 mph wind. 3 of 5 years were warm enough to slow race pace.