Expand
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, like December, is a moderate winter month in Hillsborough, California, with an average temperature varying between 56.3°F (13.5°C) and 47.5°F (8.6°C). At the onset of January, Hillsborough records an average high-temperature of a still mild 56.3°F (13.5°C), showing little deviation from the preceding month. Weather in January »
Weather in February
The last month of the winter, February, is also a moderate month in Hillsborough, California, with temperature in the range of an average low of 47.8°F (8.8°C) and an average high of 57.6°F (14.2°C). Hillsborough's February reports an average high-temperature of a still refreshing 57.6°F (14.2°C), exhibiting a minor difference from January. Weather in February »
Weather in March
March, the first month of the spring in Hillsborough, is also a moderate month, with an average temperature ranging between min 48.2°F (9°C) and max 58.8°F (14.9°C). The transition from February to March sees average high-temperatures adjusting to a still mild 58.8°F (14.9°C), from a not significantly different 57.6°F (14.2°C). Weather in March »
Weather in April
April in Hillsborough, California, is an enjoyable spring month, with an average temperature varying between 61.3°F (16.3°C) and 49.1°F (9.5°C). Hillsborough's average high-temperature in April sits at an enjoyable 61.3°F (16.3°C), showing little difference from the previous month. Weather in April »
Weather in May
The last month of the spring, May, is another comfortable month in Hillsborough, California, with an average temperature fluctuating between 50.5°F (10.3°C) and 63.1°F (17.3°C). The transition into May shows a subtle variation to a still enjoyable 63.1°F (17.3°C) from April's 61.3°F (16.3°C) in the average high-temperature. Weather in May »
Weather in June
The first month of the summer, June, is also an enjoyable month in Hillsborough, California, with an average temperature varying between 67.6°F (19.8°C) and 54°F (12.2°C). In June, Hillsborough notes an average high-temperature of a still refreshing 67.6°F (19.8°C), hardly different from the preceding month. Weather in June »
Weather in July
July in Hillsborough, California, is a pleasant summer month, 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). Hillsborough experiences an average high-temperature of a pleasant 69.6°F (20.9°C) in July, marking an insignificant shift from 67.6°F (19.8°C) in June. Weather in July »
Weather in August
The last month of the summer, August, is also an agreeable month in Hillsborough, California, with temperature in the range of an average high of 69.4°F (20.8°C) and an average low of 56.5°F (13.6°C). Hillsborough, California, greets August with an average high-temperature of a still pleasant 69.4°F (20.8°C), marking a slight deviation from the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Hillsborough, is still a pleasant month, with an average temperature ranging between max 70.2°F (21.2°C) and min 56.8°F (13.8°C). September, on average, is the warmest month, registering a high temperature of 70.2°F (21.2°C) and a low of 56.8°F (13.8°C). Weather in September »
Weather in October
October, the same as September, is another enjoyable autumn month in Hillsborough, California, with temperature in the range of an average low of 55.6°F (13.1°C) and an average high of 67.1°F (19.5°C). Hillsborough's weather in October, with an average high-temperature of an enjoyable 67.1°F (19.5°C), subtly shifts from September's 70.2°F (21.2°C). Weather in October »
Weather in November
The last month of the autumn, November, is another comfortable month in Hillsborough, California, with temperature in the range of an average high of 61.2°F (16.2°C) and an average low of 51.8°F (11°C). The onset of November aligns with a soft reduction in the average high-temperature, gently falling from 67.1°F (19.5°C) in October to a still refreshing 61.2°F (16.2°C). Weather in November »
Weather in December
December, the first month of the winter in Hillsborough, is still a refreshing month, 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 is the coldest month, with an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 47.8°F (8.8°C). Weather in December »
[Resources]Frequently asked questions
How much does it rain in Hillsborough?
Throughout the year, in Hillsborough, there are 81.5 rainfall days, and 12.8" (325mm) of precipitation is accumulated.
What is the rainiest month in Hillsborough?
February is the month with the most rainfall. Rain falls for 9 days and accumulates 2.44" (62mm) of precipitation.
When is the lowest UV index in Hillsborough?
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 Hillsborough?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Hillsborough, 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.
When are the longest days in Hillsborough?
The month with the longest days is June, with an average of 14h and 42min of daylight.
What are the months with the highest UV index in Hillsborough?
June through September, with an average maximum UV index of 5, are months with the highest UV index in Hillsborough.
What is the driest month in Hillsborough?
July is the month with the least rainfall in Hillsborough. Rain falls for 2.4 days and accumulates 0.08" (2mm) of precipitation.
What month has the most sunshine in Hillsborough?
The month with the most sunshine is July, with an average of 11.8h of sunshine.
What is the most humid month in Hillsborough?
August is the most humid month in Hillsborough, California, with an average relative humidity of 78%.
What time of the year is the hottest in Hillsborough?
The month of September, characterized by an average high of 70.2°F (21.2°C) and a low of 56.8°F (13.8°C), is recognized as the warmest.
What is the least humid month in Hillsborough?
With an average relative humidity of 70%, October is the least humid month in Hillsborough.
What are the coldest months in Hillsborough?
December, known for its average high temperature of 55.6°F (13.1°C) and an average low temperature of 47.8°F (8.8°C), is the coldest month in Hillsborough, California.
What is the month with the shortest days in Hillsborough?
December has the shortest days of the year in Hillsborough, California, with an average of 9h and 36min of daylight.
What is the month with the least sunshine in Hillsborough?
The month with the least sunshine is December, with an average of 5.8h of sunshine.
Average temperature
Hillsborough, 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
Hillsborough, 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
Hillsborough, 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
Hillsborough, CA
The month with the highest relative humidity is August (78%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Hillsborough, 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
Hillsborough, 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
Hillsborough, 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 3min - Average sunshine in June:
11h and 4min
- Average sunshine in July:
11h and 5min - Average sunshine in August:
11h and 4min - Average sunshine in September:
10h and 5min - 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: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days
Hillsborough, 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
Hillsborough, 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
Hillsborough, 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
Hillsborough, 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).
Hillsborough, California, USA
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location
