Climate and monthly weather forecastAtherton, CA
Climate and monthly weather forecast
Weather in January
January, the same as December, in Atherton, California, is another mild winter month, with an average temperature varying between 56.8°F (13.8°C) and 46.4°F (8°C). Atherton's shift from December to January is accompanied by an average high-temperature of a still refreshing 56.8°F (13.8°C), a slight deviation from 55.9°F (13.3°C). Weather in January »Weather in February
February, the last month of the winter in Atherton, is another mild month, with an average temperature varying between 58.1°F (14.5°C) and 46°F (7.8°C). Atherton's average high-temperature in February is a still moderate 58.1°F (14.5°C), indicating a subtle variation from January. Weather in February »Weather in March
The first month of the spring, March, is still a refreshing month in Atherton, California, with temperature in the range of an average high of 59.9°F (15.5°C) and an average low of 46.9°F (8.3°C). Atherton registers an average high-temperature of a still moderate 59.9°F (15.5°C) with the arrival of March, showing minor deviation from the preceding month. Weather in March »Weather in April
April is an enjoyable spring month in Atherton, California, with an average temperature ranging between min 48.2°F (9°C) and max 62.8°F (17.1°C). April denotes a minimal variation in the average high-temperature to an enjoyable 62.8°F (17.1°C) from March's 59.9°F (15.5°C). Weather in April »Weather in May
May, the last month of the spring in Atherton, is also an enjoyable month, with an average temperature varying between 65.3°F (18.5°C) and 50.2°F (10.1°C). With May's advent, Atherton sees an average high-temperature of a still comfortable 65.3°F (18.5°C), subtly shifted from April's 62.8°F (17.1°C). Weather in May »Weather in June
The first month of the summer, June, is an agreeable month in Atherton, California, with temperature in the range of an average high of 70.3°F (21.3°C) and an average low of 53.2°F (11.8°C). Atherton transitions into June recording an average high-temperature of a pleasant 70.3°F (21.3°C), closely aligning with the preceding month's temperature. Weather in June »Weather in July
July, like June, is an agreeable summer month in Atherton, California, with an average temperature ranging between max 73°F (22.8°C) and min 54.5°F (12.5°C). In Atherton, July and August are characterised by the peak of temperatures, recording an average high of 73°F (22.8°C). Weather in July »Weather in August
The last month of the summer, August, is another pleasant month in Atherton, California, with an average temperature fluctuating between 73°F (22.8°C) and 56.1°F (13.4°C). The months of July and August are noted for their peak temperatures, with an average high-temperature of 73°F (22.8°C). Weather in August »Weather in September
September, the first month of the autumn in Atherton, is also an agreeable month, with temperature in the range of an average high of 72.7°F (22.6°C) and an average low of 56.7°F (13.7°C). The transition from August to September brings an average high-temperature of a still pleasant 72.7°F (22.6°C), barely different from August's 73°F (22.8°C). Weather in September »Weather in October
October, the same as September, in Atherton, California, is an agreeable autumn month, with temperature in the range of an average high of 68.5°F (20.3°C) and an average low of 55°F (12.8°C). The shift into October records an average high-temperature of a still pleasant 68.5°F (20.3°C), subtly varied from September's 72.7°F (22.6°C). Weather in October »Weather in November
November, the last month of the autumn in Atherton, is also an enjoyable month, with an average temperature ranging between max 61.9°F (16.6°C) and min 50.7°F (10.4°C). November is marked by a subtle drop in average high-temperatures, transitioning from a pleasant 68.5°F (20.3°C) in October to a comfortable 61.9°F (16.6°C). Weather in November »Weather in December
December, the first month of the winter in Atherton, is still a mild month, with an average temperature varying between 55.9°F (13.3°C) and 46.6°F (8.1°C). With average high temperatures of 55.9°F (13.3°C) and lows of 46.6°F (8.1°C), December is the coldest month. Weather in December »Updated: Aug 8, 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 73.4 rainfall days, and 11.89" (302mm) of precipitation is accumulated.
The month with the most rainfall is February, when the rain falls for 8.8 days and typically aggregates up to 2.36" (60mm) of precipitation.
With an average relative humidity of 75%, March is the most humid month.
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 in Atherton.
June through September, with an average maximum UV index of 5, are months with the highest UV index.
In Atherton, the months of July and August are known for the peak temperatures, reaching an average high of 73°F (22.8°C).
July and August are months with the least rain when the rain falls for 1.5 days and typically aggregates up to 0.04" (1mm) of rain.
The month with the most sunshine in Atherton is July, with an average of 12h of sunshine.
With an average relative humidity of 68%, October is the least humid month.
November and December, with an average maximum UV index of 3, are months with the lowest UV index.
With its average high temperature of 55.9°F (13.3°C) and a low of 46.6°F (8.1°C), December is regarded as the coldest month.
With an average of 9h and 36min of daylight, December has the shortest days of the year in Atherton.
With an average of 5.8h of sunshine, December has the least sunshine of the year in Atherton.
Average temperature
Atherton, CA
The warmest months (with the highest average high temperature) are July and August (73°F).
The month with the lowest average high temperature is December (55.9°F).
The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is February (46°F).
Average pressure
Atherton, 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:
29.93"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
Atherton, CA
- Average wind speed in January:
5.8mph - Average wind speed in February:
6.9mph - Average wind speed in March:
7.2mph - Average wind speed in April:
7.5mph - Average wind speed in May:
7.3mph - Average wind speed in June:
6.8mph
- Average wind speed in July:
5.7mph - Average wind speed in August:
5.5mph - Average wind speed in September:
5.5mph - Average wind speed in October:
5.5mph - Average wind speed in November:
5.7mph - Average wind speed in December:
6.5mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.5mph).
Average humidity
Atherton, CA
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (68%).
Average rainfall
Atherton, CA
- Average rainfall in January:
1.93" - Average rainfall in February:
2.36" - Average rainfall in March:
2.05" - Average rainfall in April:
0.67" - Average rainfall in May:
0.59" - Average rainfall in June:
0.12"
- Average rainfall in July:
0.04" - Average rainfall in August:
0.04" - Average rainfall in September:
0.12" - Average rainfall in October:
0.55" - Average rainfall in November:
1.38" - Average rainfall in December:
2.05"
The wettest month (with the highest rainfall) is February (2.36").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days
Atherton, CA
- Average rainfall days in January:
10.1 days - Average rainfall days in February:
8.8 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
7.8 days - Average rainfall days in May:
5.3 days - Average rainfall days in June:
1.8 days
- Average rainfall days in July:
1.5 days - Average rainfall days in August:
0.8 days - Average rainfall days in September:
2.4 days - Average rainfall days in October:
5 days - Average rainfall days in November:
6.9 days - Average rainfall days in December:
10.2 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (0.8 days).
Average daylight / Average sunshine
Atherton, 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 12min - 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 42min - Average sunshine in June:
11h and 42min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
11h and 54min - 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 48min
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 48min).
Average sunshine days
Atherton, CA
- Average sunshine days in January:
19.8 days - Average sunshine days in February:
18.3 days - Average sunshine days in March:
17.5 days - Average sunshine days in April:
21.3 days - Average sunshine days in May:
23.2 days - Average sunshine days in June:
26.3 days
- Average sunshine days in July:
27.5 days - Average sunshine days in August:
27.6 days - Average sunshine days in September:
26.4 days - Average sunshine days in October:
24.4 days - Average sunshine days in November:
22.5 days - Average sunshine days in December:
19.3 days
The month with the most sunshine days is August (27.6 days).
The month with the least sunshine days is March (17.5 days).
Average UV index
Atherton, 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 November and December (UV index 3).
Average cloud cover
Atherton, CA
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility
Atherton, 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).
