San Diego Half Marathon weather.
Typically 15°C on race morning; rain in 3 of the last 10 years. Race morning (07:00 to 11:00 local time) in San Diego on race day in each of the last 10 years; the 2027 race is on 21 Mar 2027.
- Typical
- 15°C (59°F)
- race-morning average
- Coolest
- 9°C (48°F)
- lowest reading, 07:00–11:00
- Warmest
- 20°C (68°F)
- highest reading, 07:00–11:00
- Wet years
- 3 of 10
- rain, drizzle or worse
- Humidity
- 78%
- typical
- Wind
- 8 km/h
- typical, at 10 m
Race morning, 07:00–11:00
Year by year
| Race day | Average | Low–high | Humidity | Wind | Rain | Conditions |
|---|---|---|---|---|---|---|
| 22 Mar 2026 | 17°C (62°F) | 15°C (58°F)–20°C (68°F) | 88% | 4 km/h | 0.0 mm | Overcast |
| 23 Mar 2025 | 14°C (58°F) | 12°C (54°F)–17°C (63°F) | 82% | 3 km/h | 0.0 mm | Partly cloudy |
| 24 Mar 2024 | 14°C (57°F) | 12°C (53°F)–15°C (60°F) | 67% | 29 km/h | 4.7 mm | Light rain |
| 19 Mar 2023 | 15°C (58°F) | 13°C (56°F)–16°C (61°F) | 79% | 10 km/h | 0.0 mm | Overcast |
| 20 Mar 2022 | 15°C (58°F) | 13°C (55°F)–17°C (62°F) | 73% | 12 km/h | 0.4 mm | Light drizzle |
| 21 Mar 2021 | 13°C (55°F) | 10°C (49°F)–15°C (60°F) | 70% | 11 km/h | 0.0 mm | Clear |
| 22 Mar 2020 | 14°C (56°F) | 9°C (49°F)–17°C (63°F) | 76% | 6 km/h | 0.0 mm | Partly cloudy |
| 24 Mar 2019 | 15°C (58°F) | 12°C (54°F)–17°C (62°F) | 81% | 7 km/h | 0.2 mm | Light drizzle |
| 18 Mar 2018 | 13°C (55°F) | 10°C (49°F)–15°C (58°F) | 69% | 8 km/h | 0.0 mm | Overcast |
| 19 Mar 2017 | 16°C (61°F) | 13°C (56°F)–20°C (67°F) | 84% | 6 km/h | 0.0 mm | Clear |
Each row is the race's date that year where we know it, else the same weekday nearest its usual date. Temperatures and humidity are averaged over 07:00 to 11:00 local time, rain is the total over those hours, and conditions are the commonest over the morning. The half marathon starts at 06:50.
Kit and pacing
What it means
Mild: start a touch conservatively
Around 15°C feels fine at the start but warms up by the second half. Drink from the early stations rather than waiting until you're thirsty, and wear the lightest kit you have.
Have a warm-day plan
In the warmest of these years it reached 20°C by late morning. Decide in advance how much you'd slow down if the forecast is warm, rather than on the course.
Be ready for rain
It rained on 3 of the last 10 race mornings. A bin bag or cheap poncho keeps you dry in the start pen; anti-chafe balm and socks that don't hold water help over the distance, and a cap keeps rain out of your eyes.
Humid mornings
Humidity is usually around 78%, so sweat evaporates slowly and it feels warmer than the thermometer says. Pace on effort, not just the watch.
General guidance from past years' numbers. Check the forecast in race week.
Weather data by Open-Meteo.com, from its historical weather archive (CC BY 4.0).