Climate and monthly weather forecastLos Altos, CA
Climate and monthly weather forecast
Weather in January
January, the same as December, in Los Altos, California, is a moderate winter month, with an average temperature ranging between min 44.2°F (6.8°C) and max 57.7°F (14.3°C). January experiences an average high-temperature of a still refreshing 57.7°F (14.3°C), barely different from December's 56.5°F (13.6°C). Weather in January »Weather in February
The last month of the winter, February, is another mild month in Los Altos, California, with temperature in the range of an average high of 59.9°F (15.5°C) and an average low of 44.2°F (6.8°C). February's average high-temperature is a still mild 59.9°F (15.5°C), maintaining a close comparison with January's 57.7°F (14.3°C). Weather in February »Weather in March
March, the first month of the spring in Los Altos, is a comfortable month, with an average temperature varying between 62.2°F (16.8°C) and 45°F (7.2°C). As Los Altos, California, transitions from February to March, the average high-temperatures adjust to an enjoyable 62.2°F (16.8°C), nearly the same as the previous 59.9°F (15.5°C). Weather in March »Weather in April
April, like March, in Los Altos, California, is another refreshing spring month, with an average temperature fluctuating between 46°F (7.8°C) and 66.2°F (19°C). At the onset of April, Los Altos records an average high-temperature of a still enjoyable 66.2°F (19°C), showing little deviation from the preceding month. Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Los Altos, California, with temperature in the range of an average low of 49.5°F (9.7°C) and an average high of 69.3°F (20.7°C). With the onset of May, a modest change to an agreeable 69.3°F (20.7°C) from April's 66.2°F (19°C) is noted in high-temperature. Weather in May »Weather in June
June, the first month of the summer in Los Altos, is a warm month, with an average temperature varying between 76.6°F (24.8°C) and 53.4°F (11.9°C). As Los Altos welcomes June, the average high-temperature displays a subtle shift, adjusting from a pleasant 69.3°F (20.7°C) in May to a warm 76.6°F (24.8°C). Weather in June »Weather in July
July, like June, in Los Altos, California, is a moderately hot summer month, with an average temperature varying between 79.7°F (26.5°C) and 55.2°F (12.9°C). July, with its high-temperature average of 79.7°F (26.5°C) and a low-temperature average of 55.2°F (12.9°C), is the warmest month. Weather in July »Weather in August
August, the last month of the summer in Los Altos, is another warm month, with an average temperature fluctuating between 56.8°F (13.8°C) and 79.3°F (26.3°C). The shift into August finds Los Altos at an average high-temperature of a still moderately hot 79.3°F (26.3°C), closely comparable to July's conditions. Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Los Altos, California, with temperature in the range of an average high of 77.9°F (25.5°C) and an average low of 56.1°F (13.4°C). As Los Altos transitions into September, the average high-temperature stands at a still moderately hot 77.9°F (25.5°C), offering little variation from the preceding month. Weather in September »Weather in October
October, the same as September, in Los Altos, California, is another pleasant autumn month, with an average temperature ranging between max 71.8°F (22.1°C) and min 54°F (12.2°C). During the shift to October, a minor reduction in average high-temperature is observed, shifting from a warm 77.9°F (25.5°C) in September to an agreeable 71.8°F (22.1°C). Weather in October »Weather in November
November, the last month of the autumn in Los Altos, is another refreshing month, with an average temperature fluctuating between 48.7°F (9.3°C) and 63.7°F (17.6°C). In Los Altos, the beginning of November is marked by a marginally lowered average high-temperature, shifting from October's agreeable 71.8°F (22.1°C) to an enjoyable 63.7°F (17.6°C). Weather in November »Weather in December
The first month of the winter, December, is still a refreshing month in Los Altos, California, with an average temperature ranging between min 44.1°F (6.7°C) and max 56.5°F (13.6°C). The coldest temperatures occur during December, when averages reach a peak of 56.5°F (13.6°C) and a low of 44.1°F (6.7°C). Weather in December »Updated: Feb 9, 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
In Los Altos, California, during the entire year, the rain falls for 53.1 days and collects up to 4.41" (112mm) of precipitation.
The months with the most rainfall in Los Altos are February, March and December, with an average 0.83" (21mm) of precipitation.
February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.
With an average relative humidity of 73%, March is the most humid month.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Los Altos, California, 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.
June through August are months with the least rain in Los Altos, California, when the rain falls for 1.5 days and typically aggregates up to 0.04" (1mm) of rain.
The month with the longest days is June, with an average of 14h and 42min of daylight.
June is the month with the highest UV index in Los Altos, California, with an average maximum UV index of 6.
In Los Altos, July is the warmest month, with temperatures averaging a high of 79.7°F (26.5°C) and a low of 55.2°F (12.9°C).
The months with the lowest humidity in Los Altos, California, are July, September and October, with an average relative humidity of 63%.
The months with the most sunshine in Los Altos are July and August, with an average of 12h of sunshine.
Los Altos's December weather, with an average high temperature of 56.5°F (13.6°C) and an average low temperature of 44.1°F (6.7°C), tends to be the coldest of the year.
The month with the shortest days in Los Altos, California, is December, with an average of 9h and 36min of daylight.
With an average of 5.9h of sunshine, December has the least sunshine of the year in Los Altos, California.
Average temperature
Los Altos, CA
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (56.5°F).
The month with the highest average low temperature is August (56.8°F).
The coldest month (with the lowest average low temperature) is December (44.1°F).
Average pressure
Los Altos, CA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
30.04"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.92"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 months with the lowest atmospheric pressure are June and September (29.92"Hg).
Average wind speed
Los Altos, CA
- Average wind speed in January:
4.9mph - Average wind speed in February:
5.8mph - Average wind speed in March:
6mph - Average wind speed in April:
6.2mph - Average wind speed in May:
6.2mph - Average wind speed in June:
5.7mph
- Average wind speed in July:
4.9mph - Average wind speed in August:
4.7mph - Average wind speed in September:
4.7mph - Average wind speed in October:
4.7mph - Average wind speed in November:
4.7mph - Average wind speed in December:
5.3mph
The windiest months (with the highest average wind speed) are April and May (6.2mph).
The calmest months (with the lowest average wind speed) are August, September, October and November (4.7mph).
Average humidity
Los Altos, CA
The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are July, September and October (63%).
Average rainfall
Los Altos, CA
- Average rainfall in January:
0.59" - Average rainfall in February:
0.83" - Average rainfall in March:
0.83" - Average rainfall in April:
0.28" - Average rainfall in May:
0.2" - 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:
0.55" - Average rainfall in December:
0.83"
The wettest months (with the highest rainfall) are February, March and December (0.83").
The driest months (with the least rainfall) are June, July and August (0.04").
Average rainfall days
Los Altos, CA
- Average rainfall days in January:
6.6 days - Average rainfall days in February:
6 days - Average rainfall days in March:
10 days - Average rainfall days in April:
5.8 days - Average rainfall days in May:
3.6 days - Average rainfall days in June:
1.5 days
- Average rainfall days in July:
1.3 days - Average rainfall days in August:
0.4 days - Average rainfall days in September:
2.3 days - Average rainfall days in October:
2.8 days - Average rainfall days in November:
4.6 days - Average rainfall days in December:
8.2 days
The month with the highest number of rainy days is March (10 days).
The month with the least rainy days is August (0.4 days).
Average daylight / Average sunshine
Los Altos, 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 24min - 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 18min - Average sunshine in February:
6h and 24min - Average sunshine in March:
7h and 54min - Average sunshine in April:
10h and 30min - Average sunshine in May:
10h and 54min - Average sunshine in June:
11h and 48min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 0min - Average sunshine in September:
11h and 0min - Average sunshine in October:
7h and 6min - Average sunshine in November:
6h and 36min - Average sunshine in December:
5h and 54min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days
Los Altos, CA
- Average sunshine days in January:
23.4 days - Average sunshine days in February:
20.6 days - Average sunshine days in March:
19.4 days - Average sunshine days in April:
23.2 days - Average sunshine days in May:
25.8 days - Average sunshine days in June:
27.8 days
- Average sunshine days in July:
29.8 days - Average sunshine days in August:
29.8 days - Average sunshine days in September:
27.5 days - Average sunshine days in October:
27.1 days - Average sunshine days in November:
24.2 days - Average sunshine days in December:
21.9 days
The months with the most sunshine days are July and August (29.8 days).
The month with the least sunshine days is March (19.4 days).
Average UV index
Los Altos, CA
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover
Los Altos, CA
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility
Los Altos, 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).
