Climate and monthly weather forecastMillbrae, CA
Climate and monthly weather forecast
Weather in January
January, the same as December, in Millbrae, California, is a moderate winter month, with temperature in the range of an average low of 47.5°F (8.6°C) and an average high of 56.3°F (13.5°C). Millbrae experiences a recorded average high-temperature of a still moderate 56.3°F (13.5°C) in January, closely aligned with December's 55.6°F (13.1°C). Weather in January »Weather in February
February, the last month of the winter in Millbrae, is another refreshing month, with an average temperature varying between 57.6°F (14.2°C) and 47.8°F (8.8°C). The average high-temperature for February is a still moderate 57.6°F (14.2°C), closely aligning with the temperature of the preceding month. Weather in February »Weather in March
March, the first month of the spring in Millbrae, is still a mild month, with an average temperature ranging between max 58.8°F (14.9°C) and min 48.2°F (9°C). The transition from February to March sees an average high-temperature of a still refreshing 58.8°F (14.9°C), indicating a minor variance from the prior month. Weather in March »Weather in April
April in Millbrae, California, is an enjoyable spring month, with an average temperature varying between 49.1°F (9.5°C) and 61.3°F (16.3°C). As Millbrae, California, welcomes April, the average high-temperature stabilizes at a still refreshing 61.3°F (16.3°C), showing little deviation from March's 58.8°F (14.9°C). Weather in April »Weather in May
May, the last month of the spring in Millbrae, is also an enjoyable month, with an average temperature varying between 50.5°F (10.3°C) and 63.1°F (17.3°C). The advent of May signifies a minor shift to an average high-temperature of a still enjoyable 63.1°F (17.3°C), aligning closely with April. Weather in May »Weather in June
The first month of the summer, June, is still a refreshing month in Millbrae, California, with an average temperature varying between 67.6°F (19.8°C) and 54°F (12.2°C). Millbrae records an average high-temperature of a still comfortable 67.6°F (19.8°C) in June, closely mirroring the climate of the previous month. Weather in June »Weather in July
July is a pleasant summer month in Millbrae, California, with temperature in the range of an average low of 55°F (12.8°C) and an average high of 69.6°F (20.9°C). Millbrae ushers in July with an average high-temperature of a pleasant 69.6°F (20.9°C), showing a close resemblance to the previous month. Weather in July »Weather in August
August, the last month of the summer in Millbrae, is also an agreeable month, with an average temperature ranging between max 69.4°F (20.8°C) and min 56.5°F (13.6°C). During August, Millbrae records an average high-temperature of a still pleasant 69.4°F (20.8°C), marking a slight divergence from July's 69.6°F (20.9°C). Weather in August »Weather in September
The first month of the autumn, September, is still a pleasant month in Millbrae, California, with temperature in the range of an average high of 70.2°F (21.2°C) and an average low of 56.8°F (13.8°C). September is the warmest month, with the temperature often reaching an average high of 70.2°F (21.2°C) and an average low of 56.8°F (13.8°C). Weather in September »Weather in October
October, the same as September, is another refreshing autumn month in Millbrae, California, with temperature in the range of an average high of 67.1°F (19.5°C) and an average low of 55.6°F (13.1°C). The commencement of October brings an average high-temperature of an enjoyable 67.1°F (19.5°C), marking an inconsequential divergence from September. Weather in October »Weather in November
November, the last month of the autumn in Millbrae, is another refreshing month, with an average temperature ranging between min 51.8°F (11°C) and max 61.2°F (16.2°C). Millbrae in November undergoes a slight reduction in the average high-temperature, shifting from October's enjoyable 67.1°F (19.5°C) to a still comfortable 61.2°F (16.2°C). Weather in November »Weather in December
December, the first month of the winter in Millbrae, is also a moderate month, with an average temperature ranging between max 55.6°F (13.1°C) and min 47.8°F (8.8°C). The coldest period is December, when temperatures fluctuate between an average high of 55.6°F (13.1°C) and a low of 47.8°F (8.8°C). Weather in December »Updated: Jul 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Throughout the year, there are 81.5 rainfall days, and 12.8" (325mm) of precipitation is accumulated.
February is the month with the most rainfall. Rain falls for 9 days and accumulates 2.44" (62mm) of precipitation.
The months with the lowest UV index are February and December, with an average maximum UV index of 3.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
With an average of 14h and 42min of daylight, June has the longest days of the year.
June through September, with an average maximum UV index of 5, are months with the highest UV index.
July is the month with the least rainfall. Rain falls for 2.4 days and accumulates 0.08" (2mm) of precipitation.
The month with the most sunshine is July, with an average of 11.8h of sunshine.
With an average relative humidity of 78%, August is the most humid month.
Millbrae witnesses the warmest weather in September, with temperatures averaging a high of 70.2°F (21.2°C) and a low of 56.8°F (13.8°C).
The least humid month is October, with an average relative humidity of 70%.
With average high temperatures of 55.6°F (13.1°C) and lows of 47.8°F (8.8°C), December is the coldest month in Millbrae.
December has the shortest days of the year, with an average of 9h and 36min of daylight.
December has the least sunshine of the year in Millbrae, with an average of 5.8h of sunshine.
Average temperature
Millbrae, CA
The warmest month (with the highest average high temperature) is September (70.2°F).
The month with the lowest average high temperature is December (55.6°F).
The month with the highest average low temperature is September (56.8°F).
The coldest month (with the lowest average low temperature) is January (47.5°F).
Average pressure
Millbrae, CA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
30.04"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.93"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).
Average wind speed
Millbrae, CA
- Average wind speed in January:
6.5mph - Average wind speed in February:
7.7mph - Average wind speed in March:
8mph - Average wind speed in April:
8.3mph - Average wind speed in May:
8.2mph - Average wind speed in June:
7.5mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.2mph - Average wind speed in September:
6.1mph - Average wind speed in October:
6.4mph - Average wind speed in November:
6.4mph - Average wind speed in December:
7.2mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is September (6.1mph).
Average humidity
Millbrae, CA
The month with the highest relative humidity is August (78%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Millbrae, CA
- Average rainfall in January:
2.05" - Average rainfall in February:
2.44" - Average rainfall in March:
2.2" - Average rainfall in April:
0.67" - Average rainfall in May:
0.63" - Average rainfall in June:
0.16"
- Average rainfall in July:
0.08" - Average rainfall in August:
0.12" - Average rainfall in September:
0.16" - Average rainfall in October:
0.67" - Average rainfall in November:
1.46" - Average rainfall in December:
2.17"
The wettest month (with the highest rainfall) is February (2.44").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days
Millbrae, CA
- Average rainfall days in January:
10.4 days - Average rainfall days in February:
9 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
8.4 days - Average rainfall days in May:
5.7 days - Average rainfall days in June:
2.4 days
- Average rainfall days in July:
2.4 days - Average rainfall days in August:
3 days - Average rainfall days in September:
3.4 days - Average rainfall days in October:
5.2 days - Average rainfall days in November:
7.7 days - Average rainfall days in December:
11.1 days
The month with the highest number of rainy days is March (12.8 days).
The months with the least rainy days are June and July (2.4 days).
Average daylight / Average sunshine
Millbrae, CA
- Average daylight in January:
9h and 54min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 12min - Average daylight in June:
14h and 42min
- Average daylight in July:
14h and 30min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 12min - Average daylight in December:
9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
6h and 6min - Average sunshine in February:
6h and 18min - Average sunshine in March:
7h and 48min - Average sunshine in April:
10h and 18min - Average sunshine in May:
10h and 30min - Average sunshine in June:
11h and 36min
- Average sunshine in July:
11h and 48min - Average sunshine in August:
11h and 42min - Average sunshine in September:
10h and 54min - Average sunshine in October:
7h and 6min - Average sunshine in November:
6h and 36min - Average sunshine in December:
5h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days
Millbrae, CA
- Average sunshine days in January:
19.9 days - Average sunshine days in February:
18.2 days - Average sunshine days in March:
16.3 days - Average sunshine days in April:
20.1 days - Average sunshine days in May:
22.1 days - Average sunshine days in June:
23.7 days
- Average sunshine days in July:
24.6 days - Average sunshine days in August:
22.4 days - Average sunshine days in September:
23.2 days - Average sunshine days in October:
24.2 days - Average sunshine days in November:
21.5 days - Average sunshine days in December:
19.1 days
The month with the most sunshine days is July (24.6 days).
The month with the least sunshine days is March (16.3 days).
Average UV index
Millbrae, CA
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February and December (UV index 3).
Average cloud cover
Millbrae, CA
The month with the most cloud cover is March (Cloud cover 36).
The months with the least cloud cover are July and September (Cloud cover 15).
Average visibility
Millbrae, CA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
