Irvine Weather in September

September in Irvine typically sees daytime highs of 16°C (61°F) and nighttime lows of 11°C (52°F). Rainfall is also possible this month, so it's worth packing an umbrella. It falls within the summer season.

Rainfall in Irvine in September

Rain is expected on roughly 19 days, totalling around 119 mm (4.7 in) for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.

Temperature in Irvine in September

Temperatures in Irvine in September top out at 16°C (61°F) and drop to 11°C (52°F) overnight. Summer occurs in September. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With lows of 11°C (52°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Irvine in September

The month brings about 117 hours of sunlight, offering a comfortable mix of sun and overcast.

Should you favor a climate that's both dry and comfortably warm, May, June, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.