San Francisco Half Marathon weather.
Typically 10°C on race morning; rain in 3 of the last 10 years. Race morning (07:00 to 11:00 local time) in San Francisco on race day in each of the last 10 years; the 2027 race is on 7 Feb 2027.
- Typical
- 10°C (50°F)
- race-morning average
- Coolest
- 5°C (41°F)
- lowest reading, 07:00–11:00
- Warmest
- 16°C (61°F)
- highest reading, 07:00–11:00
- Wet years
- 3 of 10
- rain, drizzle or worse
- Humidity
- 81%
- typical
- Wind
- 10 km/h
- typical, at 10 m
Race morning, 07:00–11:00
Year by year
| Race day | Average | Low–high | Humidity | Wind | Rain | Conditions |
|---|---|---|---|---|---|---|
| 8 Feb 2026 | 11°C (52°F) | 10°C (51°F)–13°C (55°F) | 94% | 4 km/h | 0.0 mm | Overcast |
| 9 Feb 2025 | 7°C (44°F) | 5°C (41°F)–9°C (48°F) | 82% | 3 km/h | 0.0 mm | Clear |
| 4 Feb 2024 | 13°C (55°F) | 12°C (54°F)–13°C (55°F) | 79% | 41 km/h | 8.5 mm | Light rain |
| 5 Feb 2023 | 10°C (50°F) | 10°C (49°F)–11°C (52°F) | 81% | 28 km/h | 3.3 mm | Light rain |
| 6 Feb 2022 | 8°C (47°F) | 6°C (43°F)–11°C (52°F) | 86% | 10 km/h | 0.0 mm | Clear |
| 7 Feb 2021 | 8°C (47°F) | 7°C (44°F)–11°C (52°F) | 94% | 11 km/h | 0.0 mm | Overcast |
| 9 Feb 2020 | 10°C (51°F) | 9°C (49°F)–12°C (53°F) | 49% | 34 km/h | 0.0 mm | Clear |
| 10 Feb 2019 | 7°C (44°F) | 6°C (43°F)–8°C (46°F) | 70% | 19 km/h | 1.3 mm | Light drizzle |
| 4 Feb 2018 | 14°C (56°F) | 12°C (54°F)–16°C (60°F) | 73% | 9 km/h | 0.0 mm | Overcast |
| 5 Feb 2017 | 11°C (51°F) | 10°C (49°F)–11°C (53°F) | 91% | 10 km/h | 0.0 mm | Overcast |
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 07:45.
Kit and pacing
What it means
Good racing weather
Around 10°C is close to ideal for a fast time. Shorts and a vest are enough once you're moving; bring a throwaway layer for the wait in the start pen.
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.
Expect wind
Wind was 10 km/h on a typical morning here. Run in a group on exposed stretches, and aim for even effort rather than even splits: time lost into a headwind isn't all won back with it behind you.
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).