Rancho Cucamonga, California, United States in January

January19°C average high

January has some of the coolest average daytime highs of the year, so pack for fresher conditions.

Warmest monthsJuly to September

This stretch sets the upper range for average daytime heat.

January84mm average rain

January is one of Rancho Cucamonga's wettest months, so rain is likely to be a major planning factor.

Driest monthsApril to October

This is the drier part of the year, when outdoor plans usually need less weather flexibility.

January6.9 hours average sun

January is one of Rancho Cucamonga's cloudier months, so sunshine-led plans are less reliable.

Brightest monthsJuly to August

This stretch has the strongest sunshine in the monthly averages.

January15°C average sea

January is one of the coolest sea months, so the water may feel fresher than in peak months.

Warmest seaJuly to October

Sea temperatures are usually near 20°C in this stretch, so swimming comfort is at its strongest.

January35 weather score

January is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.

Best weather monthsJune to September

These months have the strongest weather score in the monthly averages.