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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
A sign in large font of the South San Francisco City, California, on the hills over the scenic home setting below
Weather in January
January, like December, is another refreshing winter month in South San Francisco, California, with an average temperature fluctuating between 56.3°F (13.5°C) and 47.8°F (8.8°C). As January takes hold, the average high-temperature is a still mild 56.3°F (13.5°C), nearly mirroring that of the previous month. Weather in January »
Weather in February
February, the last month of the winter in South San Francisco, is also a moderate month, with an average temperature fluctuating between 47.8°F (8.8°C) and 57.2°F (14°C). South San Francisco marks the onset of February with an average high-temperature of a still mild 57.2°F (14°C), a subtle shift from January's 56.3°F (13.5°C). Weather in February »
Weather in March
March, the first month of the spring in South San Francisco, is also a moderate month, with temperature in the range of an average low of 48.2°F (9°C) and an average high of 58.5°F (14.7°C). March's arrival brings an average high-temperature of a still refreshing 58.5°F (14.7°C), demonstrating subtle variation from the preceding month. Weather in March »
Weather in April
April in South San Francisco, California, is a refreshing spring month, with an average temperature varying between 61.3°F (16.3°C) and 49.3°F (9.6°C). The unfolding of April shows an average high-temperature of a comfortable 61.3°F (16.3°C), indicating a slight variance from March's 58.5°F (14.7°C). Weather in April »
Weather in May
May, the last month of the spring in South San Francisco, is another refreshing month, with an average temperature varying between 63°F (17.2°C) and 51.1°F (10.6°C). The advent of May sees the average high-temperature at a still refreshing 63°F (17.2°C), subtly shifted from April's 61.3°F (16.3°C). Weather in May »
Weather in June
June, the first month of the summer in South San Francisco, is still a comfortable month, with an average temperature varying between 66.9°F (19.4°C) and 53.6°F (12°C). Entering June, South San Francisco's average high-temperature reads a still enjoyable 66.9°F (19.4°C), indicating a close resemblance to the previous month's climate. Weather in June »
Weather in July
July is a pleasant summer month in South San Francisco, California, with an average temperature varying between 54.7°F (12.6°C) and 68.9°F (20.5°C). July registers an average high-temperature of a pleasant 68.9°F (20.5°C), slightly varied from June's 66.9°F (19.4°C). Weather in July »
Weather in August
The last month of the summer, August, is also an agreeable month in South San Francisco, California, with temperature in the range of an average low of 56.5°F (13.6°C) and an average high of 69.1°F (20.6°C). August's advent denotes a minor fluctuation in the average high-temperature to a still agreeable 69.1°F (20.6°C) from July's 68.9°F (20.5°C). Weather in August »
Weather in September
September, the first month of the autumn in South San Francisco, is also an agreeable month, with an average temperature ranging between max 70°F (21.1°C) and min 56.5°F (13.6°C). With its high average temperature of 70°F (21.1°C) and a low of 56.5°F (13.6°C), September is regarded as the warmest month. Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in South San Francisco, California, with an average temperature varying between 55.4°F (13°C) and 66.9°F (19.4°C). The shift into October uncovers an average high-temperature of a refreshing 66.9°F (19.4°C), subtly different from the previous month. Weather in October »
Weather in November
November, the last month of the autumn in South San Francisco, is another refreshing month, with an average temperature ranging between max 61°F (16.1°C) and min 51.6°F (10.9°C). South San Francisco in November experiences a gentle temperature dip, with average high-temperatures reducing from a refreshing 66.9°F (19.4°C) in October to a still comfortable 61°F (16.1°C). Weather in November »
Weather in December
The first month of the winter, December, is still a mild month in South San Francisco, California, with temperature in the range of an average high of 55.6°F (13.1°C) and an average low of 47.8°F (8.8°C). December stands out as South San Francisco's coldest month, with an average high-temperature of 55.6°F (13.1°C) and a low-temperature of 47.8°F (8.8°C). Weather in December »
[Resources]Frequently asked questions
How much does it rain in South San Francisco?
In South San Francisco, California, during the entire year, the rain falls for 53.6 days and collects up to 3.9" (99mm) of precipitation.
What is the wettest month in South San Francisco?
The month with the most rainfall is February, when the rain falls for 6.1 days and typically aggregates up to 0.79" (20mm) of precipitation.
What is the month with the lowest UV index in South San Francisco?
February and December, with an average maximum UV index of 3, are months with the lowest UV index.
When is Daylight Saving Time (DST) in South San Francisco?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in South San Francisco, 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 South San Francisco?
The months with the least rainfall are June through August Rain falls for 1.1 days and accumulates 0.04" (1mm) of rain.
When are the longest days in South San Francisco?
The month with the longest days is June, with an average of 14h and 42min of daylight.
What is the month with the highest UV index in South San Francisco?
June through September, with an average maximum UV index of 5, are months with the highest UV index in South San Francisco.
What month has the most sunshine in South San Francisco?
The month with the most sunshine is July, with an average of 11.7h of sunshine.
What is the most humid month in South San Francisco?
August is the most humid month, with an average relative humidity of 78%.
What is the warmest month in South San Francisco?
September is South San Francisco's warmest month, registering average high temperatures of 70°F (21.1°C) and lows of 56.5°F (13.6°C).
What is the least humid month in South San Francisco?
October and November, with an average relative humidity of 71%, are the least humid months.
What are the coldest months in South San Francisco?
With its average high temperature of 55.6°F (13.1°C) and a low of 47.8°F (8.8°C), December is regarded as the coldest month.
What is the month with the shortest days in South San Francisco?
With an average of 9h and 36min of daylight, December has the shortest days of the year.
What is the month with the least sunshine in South San Francisco?
December has the least sunshine of the year, with an average of 5.8h of sunshine.
Average temperature
South San Francisco, CA
The warmest month (with the highest average high temperature) is September (70°F).
The month with the lowest average high temperature is December (55.6°F).
The months with the highest average low temperature are August and September (56.5°F).
The coldest months (with the lowest average low temperature) are January, February and December (47.8°F).
Average pressure
South San Francisco, 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
South San Francisco, CA
- Average wind speed in January:
6.6mph - Average wind speed in February:
7.8mph - Average wind speed in March:
8.1mph - Average wind speed in April:
8.5mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.7mph
- Average wind speed in July:
6.5mph - Average wind speed in August:
6.3mph - Average wind speed in September:
6.2mph - Average wind speed in October:
6.5mph - Average wind speed in November:
6.5mph - Average wind speed in December:
7.3mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is September (6.2mph).
Average humidity
South San Francisco, CA
The month with the highest relative humidity is August (78%).
The months with the lowest relative humidity are October and November (71%).
Average rainfall
South San Francisco, CA
- Average rainfall in January:
0.51" - Average rainfall in February:
0.79" - Average rainfall in March:
0.63" - Average rainfall in April:
0.2" - Average rainfall in May:
0.24" - Average rainfall in June:
0.04"
- Average rainfall in July:
0.04" - Average rainfall in August:
0.04" - Average rainfall in September:
0.08" - Average rainfall in October:
0.12" - Average rainfall in November:
0.51" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is February (0.79").
The driest months (with the least rainfall) are June, July and August (0.04").
Average rainfall days
South San Francisco, CA
- Average rainfall days in January:
7.2 days - Average rainfall days in February:
6.1 days - Average rainfall days in March:
9.4 days - Average rainfall days in April:
5.3 days - Average rainfall days in May:
3.6 days - Average rainfall days in June:
1.1 days
- Average rainfall days in July:
1.9 days - Average rainfall days in August:
1.5 days - Average rainfall days in September:
1.9 days - Average rainfall days in October:
2.9 days - Average rainfall days in November:
5 days - Average rainfall days in December:
7.7 days
The month with the highest number of rainy days is March (9.4 days).
The month with the least rainy days is June (1.1 days).
Average daylight / Average sunshine
South San Francisco, 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 0min - Average sunshine in February:
6h and 1min - Average sunshine in March:
7h and 4min - Average sunshine in April:
10h and 2min - Average sunshine in May:
10h and 2min - Average sunshine in June:
11h and 3min
- Average sunshine in July:
11h and 4min - Average sunshine in August:
11h and 3min - Average sunshine in September:
10h and 5min - Average sunshine in October:
7h and 0min - Average sunshine in November:
6h and 3min - Average sunshine in December:
5h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days
South San Francisco, CA
- Average sunshine days in January:
22.7 days - Average sunshine days in February:
20.8 days - Average sunshine days in March:
19.4 days - Average sunshine days in April:
23.1 days - Average sunshine days in May:
23.3 days - Average sunshine days in June:
26.3 days
- Average sunshine days in July:
26.3 days - Average sunshine days in August:
25 days - Average sunshine days in September:
26.3 days - Average sunshine days in October:
25.9 days - Average sunshine days in November:
23.7 days - Average sunshine days in December:
22.2 days
The months with the most sunshine days are June, July and September (26.3 days).
The month with the least sunshine days is March (19.4 days).
Average UV index
South San Francisco, 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
South San Francisco, CA
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is September (Cloud cover 16).
Average visibility
South San Francisco, 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).
South San Francisco, California, USA
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