Millbrae (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Millbrae.
Climate overview of Millbrae
Millbrae, California, United States of America, has a moderate seasonal temperature range, with September reaching 23°C (73°F) and December cooling to 14°C (57°F).
With around 491 mm (19 in) of annual rainfall, Millbrae has a fairly dry climate. However, it has a distinct dry season from May to October. The wettest month is December, while July sees the least rain. The most sunshine falls in May, with an average of 10.8 hours of daily sunshine.
Millbrae Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Millbrae - and find the best time to visit.
Monthly Temperature in Millbrae
In Millbrae, seasonal changes bring about a moderate variation in temperatures. Average daytime temperatures reach a comfortable 23°C (73°F) in September. In December, the coolest month of the year, temperatures drop to a moderate 14°C (57°F).
At night, temperatures range from around 13°C (55°F) in September to 7°C (45°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Millbrae
Millbrae typically sees modest rainfall throughout the year, with an average annual precipitation of 491 mm (19 in). Millbrae can be quite wet during December, receiving approximately 117 mm (4.6 in) of precipitation over 13 rainy days.
In contrast, during the driest month (July), you will experience much drier conditions, with 0.3 mm (0.01 in) of precipitation spread across a single rainy day. For more details, please visit our Millbrae Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Millbrae
Millbrae can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 10.8 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 5.3 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Water Temperature in Millbrae
The mean water temperature over the year ranges from 12°C (54°F) in January to 14°C (57°F) in June.
Water temperature over the year
Humidity in Millbrae by Month
The relative humidity is high throughout the year in Millbrae.
The city experiences its highest humidity in January, reaching 80%. In June, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Millbrae
The average wind speed over the year ranges from 3 m/s (6 knots) to 7 m/s (14 knots). It is lower in January, November and December and higher in June and July. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Millbrae
Each month is rated for comfortable sightseeing weather — mild temperatures and low rainfall. Tap a month for its full averages; your ideal time may differ for a beach or winter trip (see below).
- Best overall: May, June, July, August, September and October
- Warmest weather: July, August, September and October
- Most sunshine: April, May, June and July
- Fewer rainy days: May, June, July, August and September
- Wettest period: January, February, March and December, when rainfall peaks.
- Climate seasons: a distinct dry season from May to October
Frequently asked questions about the climate in Millbrae
What is the best time to visit Millbrae?
May, June, July, August, September and October typically offer the most optimal weather in Millbrae. In contrast, December tends to have less optimal conditions. Millbrae has a distinct dry season from May to October.
What temperatures can I expect in Millbrae?
Daytime highs range from 14°C (57°F) in December to 23°C (73°F) in September. Nighttime lows range from 7°C (45°F) to 13°C (55°F).
How much rain does Millbrae get?
Annual rainfall is around 491 mm (19 in). December is the wettest month with 117 mm (4.6 in), while July is the driest with 0.3 mm (0.01 in).
How sunny is Millbrae?
Millbrae receives around 3,058 hours of sunshine per year. May is the sunniest month with 324 hours, while December is the cloudiest with just 160 hours. Overall, Millbrae enjoys abundant sunshine.
Millbrae 3-Day Forecast
Millbrae (CA) 3-Day Forecast
Millbrae on the map
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