California International Marathon (CIM)

This edition is listed as Marathon in Sacramento, California, USA.

Typical race-morning air at California International Marathon (CIM) averages 7°C across the last 10 years (about 1°C to 13°C in that window). The morning can still warm as you run. The stickiest morning in that set was 2019, WBGT around 9°C. 2023 was the windiest, around 12 km/h. Use that range for planning, not as a promise for race day.

2019 (8 Dec 2019) was the hottest California International Marathon (CIM) morning in that set, WBGT around 9°C. Treat that year as the spike, not as the usual morning.

2023 (3 Dec 2023) was the windiest California International Marathon (CIM) morning in that set, around 12 km/h. Wind still changes what the same pace costs. Treat that year as the spike, not as the usual morning.

Inside about 14 days, use the live forecast on this page. Further out, use race morning history: it averages 7°C. Treat last year's day as a warning if it was an outlier, not as a forecast.

Heat, humidity, wind or a lumpier day than you hoped all raise the chance of a late fade. If the start feels easy, don't spend it. Back off early, and hold even effort even if that means slower than the A-goal. The preview on this page is the starting point. Full personalised splits sit in Race Pass or Pro.

About 172 m of climbing and 274 m of descent. Hilly. Net downhill. About 82% sits within 2%. About 1% of the course is steeper than 6%. 5 climbs.

It is an estimate of how the course and conditions could move your baseline. Your body still decides the rest: heat adaptation, fuelling, prep, mindset, how you race, and whether you can draft.

The free page covers conditions, course context and a finish preview. Full personalised pacing and weather-adjusted splits sit in Race Pass or Pro.