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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, the same as December, in Foster City, California, is another refreshing winter month, with temperature in the range of an average low of 46.9°F (8.3°C) and an average high of 56.8°F (13.8°C). January's onset brings an average high-temperature of a still mild 56.8°F (13.8°C), showing a minute difference from December's 55.8°F (13.2°C). Weather in January »
Weather in February
February, the last month of the winter in Foster City, is another refreshing month, with an average temperature varying between 57.7°F (14.3°C) and 47.1°F (8.4°C). The transition into February marks the average high-temperature at a still mild 57.7°F (14.3°C), differing minimally from January's 56.8°F (13.8°C). Weather in February »
Weather in March
March, the first month of the spring in Foster City, is also a moderate month, with an average temperature fluctuating between 59.2°F (15.1°C) and 47.7°F (8.7°C). March's presence marks an average high-temperature of a still refreshing 59.2°F (15.1°C), subtly varied from February's 57.7°F (14.3°C). Weather in March »
Weather in April
April in Foster City, California, is a refreshing spring month, with an average temperature ranging between max 62.2°F (16.8°C) and min 48.7°F (9.3°C). The start of April marks an average high-temperature of an enjoyable 62.2°F (16.8°C), hardly distinguishable from the conditions in March. Weather in April »
Weather in May
May, the last month of the spring in Foster City, is another refreshing month, with an average temperature varying between 50.7°F (10.4°C) and 63.9°F (17.7°C). Foster City notes an average high-temperature of a still enjoyable 63.9°F (17.7°C) in May, hardly diverging from April. Weather in May »
Weather in June
The first month of the summer, June, is an agreeable month in Foster City, California, with temperature in the range of an average low of 53.4°F (11.9°C) and an average high of 68.5°F (20.3°C). Foster City's shift into June is marked by a subtle change to an agreeable 68.5°F (20.3°C) from May's 63.9°F (17.7°C) in temperature. Weather in June »
Weather in July
July, like June, is an agreeable summer month in Foster City, California, with an average temperature fluctuating between 54.7°F (12.6°C) and 70.9°F (21.6°C). Transitioning into July, Foster City experiences an average high-temperature of a still agreeable 70.9°F (21.6°C), marking a minor shift from the preceding month. Weather in July »
Weather in August
August, the last month of the summer in Foster City, is also an agreeable month, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 71.2°F (21.8°C). Foster City's warmest months, August and September, record an average high-temperature of 71.2°F (21.8°C). Weather in August »
Weather in September
September, the first month of the autumn in Foster City, is still a pleasant month, with an average temperature fluctuating between 71.2°F (21.8°C) and 56.7°F (13.7°C). The yearly peak temperatures occur in August and September, averaging a high-temperature of 71.2°F (21.8°C). Weather in September »
Weather in October
October, the same as September, is another comfortable autumn month in Foster City, California, with an average temperature varying between 55.2°F (12.9°C) and 67.8°F (19.9°C). The introduction of October notes a subtle temperature variation to a comfortable 67.8°F (19.9°C) from September's 71.2°F (21.8°C). Weather in October »
Weather in November
November, the last month of the autumn in Foster City, is another comfortable month, with temperature in the range of an average low of 50.9°F (10.5°C) and an average high of 61.3°F (16.3°C). In Foster City, entering November brings a subtle temperature decrement, reducing from October's refreshing 67.8°F (19.9°C) to a still enjoyable 61.3°F (16.3°C). Weather in November »
Weather in December
The first month of the winter, December, is still a mild month in Foster City, California, with temperature in the range of an average low of 47.5°F (8.6°C) and an average high of 55.8°F (13.2°C). December, noted for its average high-temperature of 55.8°F (13.2°C) and an average low-temperature of 47.5°F (8.6°C), is considered the coldest month. Weather in December »
[Resources]Frequently asked questions
How many days does it rain in Foster City?
In Foster City, during the entire year, the rain falls for 32.6 days and collects up to 2.13" (54mm) of precipitation.
What is the wettest month in Foster City?
February is the month with the most rainfall in Foster City. Rain falls for 3.2 days and accumulates 0.55" (14mm) of precipitation.
What is the month with the lowest UV index in Foster City?
The months with the lowest UV index in Foster City are February and December, with an average maximum UV index of 3.
What is the most humid month in Foster City?
The months with the highest humidity are March and August, with an average relative humidity of 76%.
When is Daylight Saving Time (DST) in Foster City?
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.
What is the driest month in Foster City?
In Foster City, California, rain does not fall in June through August.
When are the longest days in Foster City?
June has the longest days of the year, with an average of 14h and 42min of daylight.
What is the month with the highest UV index in Foster City?
The months with the highest UV index are June through September, with an average maximum UV index of 5.
What month has the most sunshine in Foster City?
With an average of 12h of sunshine, July has the most sunshine of the year in Foster City.
What is the hottest time of year in Foster City?
Foster City's temperatures tend to hit their maximum during August and September, with an average high-temperature of 71.2°F (21.8°C).
When does it rain in Foster City?
Months with rainfall in Foster City are January through May, September through December.
What are the least humid months in Foster City?
The months with the lowest humidity are October and November, with an average relative humidity of 70%.
What is the coldest month in Foster City?
Foster City's coldest temperatures are experienced in December, with average high temperatures of 55.8°F (13.2°C) and lows of 47.5°F (8.6°C).
What is the month with the shortest days in Foster City?
The month with the shortest days in Foster City, California, is December, with an average of 9h and 36min of daylight.
What is the month with the least sunshine in Foster City?
December has the least sunshine of the year in Foster City, with an average of 5.9h of sunshine.
Average temperature
Foster City, CA
The warmest months (with the highest average high temperature) are August and September (71.2°F).
The month with the lowest average high temperature is December (55.8°F).
The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is January (46.9°F).
Average pressure
Foster City, 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:
29.99"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
Foster City, CA
- Average wind speed in January:
6.2mph - Average wind speed in February:
7.4mph - Average wind speed in March:
7.7mph - Average wind speed in April:
8mph - Average wind speed in May:
7.8mph - Average wind speed in June:
7.2mph
- Average wind speed in July:
6mph - Average wind speed in August:
5.9mph - Average wind speed in September:
5.9mph - Average wind speed in October:
5.9mph - Average wind speed in November:
6mph - Average wind speed in December:
6.9mph
The windiest month (with the highest average wind speed) is April (8mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.9mph).
Average humidity
Foster City, CA
The months with the highest relative humidity are March and August (76%).
The months with the lowest relative humidity are October and November (70%).
Average rainfall
Foster City, CA
- Average rainfall in January:
0.31" - Average rainfall in February:
0.55" - Average rainfall in March:
0.35" - Average rainfall in April:
0.08" - Average rainfall in May:
0.16" - Average rainfall in June:
0"
The wettest month (with the highest rainfall) is February (0.55").
The driest months (with the least rainfall) are June, July and August (0").
Average rainfall days
Foster City, CA
- Average rainfall days in January:
4.4 days - Average rainfall days in February:
3.2 days - Average rainfall days in March:
6.8 days - Average rainfall days in April:
3.8 days - Average rainfall days in May:
2.5 days - Average rainfall days in June:
0.4 days
- Average rainfall days in July:
0.3 days - Average rainfall days in August:
0.7 days - Average rainfall days in September:
0.9 days - Average rainfall days in October:
1.4 days - Average rainfall days in November:
2.7 days - Average rainfall days in December:
5.5 days
The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is July (0.3 days).
Average daylight / Average sunshine
Foster City, CA
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 4min
- Average daylight in July:
14h and 3min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 4min
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 1min - Average sunshine in February:
6h and 2min - Average sunshine in March:
7h and 5min - Average sunshine in April:
10h and 2min - Average sunshine in May:
10h and 4min - Average sunshine in June:
11h and 4min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
11h and 5min - Average sunshine in September:
11h and 0min - Average sunshine in October:
7h and 1min - Average sunshine in November:
6h and 4min - Average sunshine in December:
5h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days
Foster City, CA
- Average sunshine days in January:
25 days - Average sunshine days in February:
23.3 days - Average sunshine days in March:
23.8 days - Average sunshine days in April:
25.4 days - Average sunshine days in May:
27.6 days - Average sunshine days in June:
29.3 days
- Average sunshine days in July:
30.4 days - Average sunshine days in August:
30.2 days - Average sunshine days in September:
28.7 days - Average sunshine days in October:
28.8 days - Average sunshine days in November:
26.3 days - Average sunshine days in December:
24.4 days
The month with the most sunshine days is July (30.4 days).
The month with the least sunshine days is February (23.3 days).
Average UV index
Foster City, 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
Foster City, CA
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility
Foster City, 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).
Foster City, California, USA
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