Climate and monthly weather forecastSan Geronimo, CA
Climate and monthly weather forecast
Weather in January
January is a moderate winter month in San Geronimo, California, with an average temperature ranging between max 55.9°F (13.3°C) and min 46.6°F (8.1°C). Shifting into January, San Geronimo records an average high-temperature of a mild 55.9°F (13.3°C), presenting minor fluctuations compared to the previous month. Weather in January »Weather in February
The last month of the winter, February, is another mild month in San Geronimo, California, with temperature in the range of an average high of 57.4°F (14.1°C) and an average low of 46.8°F (8.2°C). The shift to February signals an average high-temperature of a still moderate 57.4°F (14.1°C), subtly varied from January's 55.9°F (13.3°C). Weather in February »Weather in March
The first month of the spring, March, is still a refreshing month in San Geronimo, California, with an average temperature fluctuating between 59.2°F (15.1°C) and 47.8°F (8.8°C). March brings an average high-temperature of a still mild 59.2°F (15.1°C), nearly identical to the preceding month. Weather in March »Weather in April
April is a refreshing spring month in San Geronimo, California, with an average temperature ranging between max 61.7°F (16.5°C) and min 48.7°F (9.3°C). The average high-temperature during April registers at an enjoyable 61.7°F (16.5°C), closely corresponding to the preceding month. Weather in April »Weather in May
May, the last month of the spring in San Geronimo, is another refreshing month, with an average temperature fluctuating between 63.3°F (17.4°C) and 50.7°F (10.4°C). San Geronimo notes an average high-temperature of a still refreshing 63.3°F (17.4°C) in May, hardly diverging from April. Weather in May »Weather in June
The first month of the summer, June, is still a comfortable month in San Geronimo, California, with an average temperature ranging between min 53.8°F (12.1°C) and max 67.8°F (19.9°C). The advent of June brings an average high-temperature of a still enjoyable 67.8°F (19.9°C), exhibiting minor difference from the previous month. Weather in June »Weather in July
July is a pleasant summer month in San Geronimo, California, with an average temperature varying between 68.5°F (20.3°C) and 54.9°F (12.7°C). The onset of July marks an average high-temperature of an agreeable 68.5°F (20.3°C), hardly differing from June's 67.8°F (19.9°C). Weather in July »Weather in August
The last month of the summer, August, is another pleasant month in San Geronimo, California, with an average temperature ranging between min 56.1°F (13.4°C) and max 69.4°F (20.8°C). August notes an average high-temperature of a still pleasant 69.4°F (20.8°C), subtly differing from July's 68.5°F (20.3°C). Weather in August »Weather in September
September, the first month of the autumn in San Geronimo, is still a pleasant month, with an average temperature fluctuating between 70.9°F (21.6°C) and 56.3°F (13.5°C). September temperatures tend to peak at an average high of 70.9°F (21.6°C) and dip to a low of 56.3°F (13.5°C). Weather in September »Weather in October
October, the same as September, is another comfortable autumn month in San Geronimo, California, with an average temperature ranging between min 54.7°F (12.6°C) and max 67.5°F (19.7°C). October registers an average high-temperature of a refreshing 67.5°F (19.7°C), slightly varied from September's 70.9°F (21.6°C). Weather in October »Weather in November
The last month of the autumn, November, is another comfortable month in San Geronimo, California, with temperature in the range of an average high of 61.2°F (16.2°C) and an average low of 50.2°F (10.1°C). With the arrival of November, San Geronimo notices a mild change in the average high-temperature, sliding from October's 67.5°F (19.7°C) to a still comfortable 61.2°F (16.2°C). Weather in November »Weather in December
December, the first month of the winter in San Geronimo, is also a fresh month, with an average temperature fluctuating between 46°F (7.8°C) and 55.2°F (12.9°C). December is the month that records the lowest temperatures, with averages ranging from a high of 55.2°F (12.9°C) to a low of 46°F (7.8°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
Throughout the year, there are 80.3 rainfall days, and 15.98" (406mm) of precipitation is accumulated.
January through November are months without snowfall.
Throughout the year, in San Geronimo, California, there are 0.1 snowfall days.
February is the month with the most rainfall in San Geronimo. Rain falls for 8.9 days and accumulates 3.43" (87mm) of precipitation.
February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in San Geronimo, 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 has the longest days of the year in San Geronimo, with an average of 14h and 48min of daylight.
June through September, with an average maximum UV index of 5, are months with the highest UV index.
July and August are months with the least rain in San Geronimo, California, when the rain falls for 2.3 days and typically aggregates up to 0.08" (2mm) of rain.
With an average of 11.2h of sunshine, July has the most sunshine of the year.
The most humid month is August, with an average relative humidity of 78%.
In San Geronimo, September is the month with the highest recorded average temperatures, measuring a high of 70.9°F (21.6°C) and a low of 56.3°F (13.5°C).
October is the least humid month in San Geronimo, with an average relative humidity of 69%.
In San Geronimo, December registers the lowest temperatures, averaging 55.2°F (12.9°C) at the peak and 46°F (7.8°C) at the lowest.
The only month with snowfall is December.
The month with the most snowfall days in San Geronimo, California, is December, when snow falls for 0.1 days.
With an average of 9h and 36min of daylight, December has the shortest days of the year in San Geronimo, California.
December has the least sunshine of the year, with an average of 5.6h of sunshine.
Average temperature
San Geronimo, CA
The warmest month (with the highest average high temperature) is September (70.9°F).
The month with the lowest average high temperature is December (55.2°F).
The month with the highest average low temperature is September (56.3°F).
The coldest month (with the lowest average low temperature) is December (46°F).
Average pressure
San Geronimo, CA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.07"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:
29.92"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.92"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:
30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed
San Geronimo, CA
- Average wind speed in January:
6.5mph - Average wind speed in February:
7.5mph - Average wind speed in March:
7.8mph - Average wind speed in April:
8.3mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.9mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.5mph - Average wind speed in September:
6.3mph - Average wind speed in October:
6mph - Average wind speed in November:
5.9mph - Average wind speed in December:
6.7mph
The windiest months (with the highest average wind speed) are April and May (8.3mph).
The calmest month (with the lowest average wind speed) is November (5.9mph).
Average humidity
San Geronimo, CA
The month with the highest relative humidity is August (78%).
The month with the lowest relative humidity is October (69%).
Average rainfall
San Geronimo, CA
- Average rainfall in January:
2.64" - Average rainfall in February:
3.43" - Average rainfall in March:
2.56" - Average rainfall in April:
0.79" - Average rainfall in May:
0.71" - Average rainfall in June:
0.2"
- Average rainfall in July:
0.08" - Average rainfall in August:
0.08" - Average rainfall in September:
0.12" - Average rainfall in October:
0.83" - Average rainfall in November:
1.73" - Average rainfall in December:
2.83"
The wettest month (with the highest rainfall) is February (3.43").
The driest months (with the least rainfall) are July and August (0.08").
Average rainfall days
San Geronimo, CA
- Average rainfall days in January:
10.3 days - Average rainfall days in February:
8.9 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
7.8 days - Average rainfall days in May:
5.7 days - Average rainfall days in June:
2.7 days
- Average rainfall days in July:
2.3 days - Average rainfall days in August:
2.7 days - Average rainfall days in September:
3.4 days - Average rainfall days in October:
5 days - Average rainfall days in November:
7.8 days - Average rainfall days in December:
10.9 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is July (2.3 days).
Average snowfall days
San Geronimo, CA
- Average snowfall days in January:
0 days - Average snowfall days in February:
0 days - Average snowfall days in March:
0 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
0.1 days
The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight / Average sunshine
San Geronimo, 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 48min
- Average daylight in July:
14h and 30min - 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 6min - Average daylight in December:
9h and 36min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
5h and 42min - Average sunshine in February:
6h and 6min - Average sunshine in March:
7h and 30min - Average sunshine in April:
10h and 0min - Average sunshine in May:
10h and 0min - Average sunshine in June:
11h and 6min
- Average sunshine in July:
11h and 12min - Average sunshine in August:
10h and 54min - Average sunshine in September:
10h and 30min - Average sunshine in October:
6h and 54min - Average sunshine in November:
6h and 24min - Average sunshine in December:
5h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days
San Geronimo, CA
- Average sunshine days in January:
20.1 days - Average sunshine days in February:
18.3 days - Average sunshine days in March:
16.6 days - Average sunshine days in April:
20.5 days - Average sunshine days in May:
22.8 days - Average sunshine days in June:
24.8 days
- Average sunshine days in July:
24.8 days - Average sunshine days in August:
23.4 days - Average sunshine days in September:
24.1 days - Average sunshine days in October:
24 days - Average sunshine days in November:
21.4 days - Average sunshine days in December:
18.7 days
The months with the most sunshine days are June and July (24.8 days).
The month with the least sunshine days is March (16.6 days).
Average UV index
San Geronimo, 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, November and December (UV index 3).
Average cloud cover
San Geronimo, CA
The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is September (Cloud cover 19).
Average visibility
San Geronimo, 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).
