December in Mira Mesa averages a daily high of 19.1°C with nights around 6.8°C. Expect roughly 8.1 wet days totalling 47.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Mira Mesa is April–October.
Based on SAN DIEGO MIRAMAR NAS, CA US (5.5km), 1995–2024. 19 years of December data.