San Bruno Weather in September

San Bruno in September averages 23°C (73°F) during the day and 13°C (55°F) at night. Minimal rainfall is typical for this time of year.

Rainfall in San Bruno in September

Typically, about a single day will experience rainfall, with an average of 3.7 mm (0.1 in) for the month. On the rare occasion it rains this month, it usually amounts to very little.

Temperature in San Bruno in September

San Bruno in September is worth a visit. The temperature is excellent, with 23°C (73°F) during the day and 13°C (55°F) at night. This kind of day-to-night contrast is typical for this time of year. 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 San Bruno in September

The city usually sees around 270 hours of sunlight, indicating many sunny days , a great month for sightseeing.

Wind Speed in San Bruno in September

Average wind conditions reach 5 m/s (10 knots) in September. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.

Average water temperature in September

The water temperature is 14°C (57°F), chilly, but perfectly fine for a swim if you're not too sensitive to cold water. A short wetsuit can make longer sessions more comfortable.

If your ideal day consists of dry skies and pleasant temperatures, May, June, July, August, September and October typically offer the best circumstances for San Bruno.