Millbrae Weather in September

Millbrae in September sees high temperatures, with highs around 23°C (73°F) and overnight lows of 13°C (55°F). With just 3.4 mm (0.1 in) of rainfall on average, rain is rarely an issue.

Rainfall in Millbrae in September

Expect around a single day of rain based on historical data, with 3.4 mm (0.1 in) average. If rain does fall, it tends to be very light and barely worth getting out an umbrella for.

Temperature in Millbrae in September

If you're visiting Millbrae in September, expect excellent temperatures with highs of 23°C (73°F) and overnight lows of 13°C (55°F). Overall, the month follows a fairly predictable daily temperature pattern. With lows of 13°C (55°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. On average, it is the month with the highest temperature of the year.

Sunshine in Millbrae in September

There are approximately 270 hours of sunshine this month, resulting in mostly clear days.

Wind Speed in Millbrae in September

Wind speeds average 5 m/s (10 knots) during September. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.

Average water temperature in September

The water is 14°C (57°F) this month, cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July, August, September and October typically offer the best weather for Millbrae.