Fullerton

What is the climate like in Fullerton?

The best time to visit Fullerton is typically June, the year's most comfortable month (6.5/10). Fullerton is warmest in July, when daily highs average 86°F (30°C), and coolest in January, when lows fall to about 26°F (-4°C). The wettest month is typically July and the driest is November; the year sees roughly 50 in (1264 mm) of precipitation.

• Best time to visitJune — the year's comfort peak (6.5/10)
• Warmest monthJuly — average high 86°F (30°C)
• Coolest monthJanuary — average low 26°F (-4°C)
• Wettest monthJuly (4.9 in (125 mm))
• Driest monthNovember (3.4 in (87 mm))
• Annual precipitation50 in (1264 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromAllentown Lehigh Vly Intl AP, 3 km away (1948-2026)