Monthly weather forecast and climate
San Ysidro, CA

Weather in January

January, like December, in San Ysidro, California, is another comfortable winter month, with average temperature ranging between max 65.5°F (18.6°C) and min 50.9°F (10.5°C). In San Ysidro, California, the average high-temperature is almost the same as in December - a still enjoyable 65.5°F (18.6°C). Weather in January »

Weather in February

The last month of the winter, February, is another comfortable month in San Ysidro, California, with average temperature fluctuating between 64.4°F (18°C) and 50.2°F (10.1°C). In San Ysidro, California, the average high-temperature in February is essentially the same as in January - a still comfortable 64.4°F (18°C). Weather in February »

Weather in March

March, the first month of the spring, in San Ysidro, is still a comfortable month, with average temperature fluctuating between 66.6°F (19.2°C) and 51.3°F (10.7°C). In San Ysidro, the average high-temperature in March is essentially the same as in February - a still enjoyable 66.6°F (19.2°C). Weather in March »

Weather in April

April in San Ysidro, California, is a pleasant spring month, with temperature in the range of an average low of 53.1°F (11.7°C) and an average high of 68.5°F (20.3°C). In April, the average high-temperature is essentially the same as in March - an agreeable 68.5°F (20.3°C). Weather in April »

Weather in May

May, the last month of the spring, in San Ysidro, is another pleasant month, with temperature in the range of an average low of 55.9°F (13.3°C) and an average high of 69.8°F (21°C). In May, the average high-temperature is practically the same as in April - a still pleasant 69.8°F (21°C). Weather in May »

Weather in June

June, the first month of the summer, in San Ysidro, is a moderately hot month, with average temperature varying between 59.2°F (15.1°C) and 74.1°F (23.4°C). In June, the average high-temperature is relatively the same as in May - a moderately hot 74.1°F (23.4°C). Weather in June »

Weather in July

July, like June, in San Ysidro, California, is a moderately hot summer month, with temperature in the range of an average low of 64.9°F (18.3°C) and an average high of 79°F (26.1°C). In July, the average high-temperature is essentially the same as in June - a still warm 79°F (26.1°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in San Ysidro, California, with average temperature fluctuating between 66.7°F (19.3°C) and 81.1°F (27.3°C). The warmest month is August, with an average high-temperature of 81.1°F (27.3°C) and an average low-temperature of 66.7°F (19.3°C). The average heat index in August is appraised at 83.7°F (28.7°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in San Ysidro, California, with average temperature varying between 80.1°F (26.7°C) and 65.5°F (18.6°C). In San Ysidro, the average high-temperature is practically the same as in August - a still warm 80.1°F (26.7°C). Weather in September »

Weather in October

October, the same as September, is another warm autumn month in San Ysidro, California, with average temperature varying between 61.2°F (16.2°C) and 75.6°F (24.2°C). In San Ysidro, the average high-temperature in October is practically the same as in September - a still warm 75.6°F (24.2°C). Weather in October »

Weather in November

The last month of the autumn, November, is another pleasant month in San Ysidro, California, with average temperature ranging between max 70.3°F (21.3°C) and min 56.1°F (13.4°C). In November, the average high-temperature is almost the same as in October - an agreeable 70.3°F (21.3°C). Weather in November »

Weather in December

The first month of the winter, December, is also an enjoyable month in San Ysidro, California, with average temperature fluctuating between 64°F (17.8°C) and 50.4°F (10.2°C). December is the coldest month, with an average high-temperature of 64°F (17.8°C) and an average low-temperature of 50.4°F (10.2°C). Weather in December »
[Resources]

FAQ

How many days does it rain in San Ysidro?

Throughout the year, in San Ysidro, there are 57.8 rainfall days, and 7.28" (185mm) of precipitation is accumulated.

What are the months with the lowest UV index in San Ysidro?

January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index in San Ysidro, California.

What is the rainiest month in San Ysidro?

February is the month with the most rainfall in San Ysidro, California. Rain falls for 6.3 days and accumulates 1.5" (38mm) of precipitation.

What is the most humid month in San Ysidro?

May is the most humid month, with an average relative humidity of 68%.

What is the driest month in San Ysidro?

The month with the least rainfall in San Ysidro, California, is June when the rain falls for 1.8 days and typically collects 0.08" (2mm) of precipitation.

When are the longest days in San Ysidro?

The month with the longest days in San Ysidro, California, is June, with an average of 14.3h of daylight.

When is the highest UV index in San Ysidro?

Months with the highest UV index in San Ysidro, California, are June through September, with an average maximum UV index of 6.

What month has the most sunshine in San Ysidro?

July has the most sunshine of the year, with an average of 12h of sunshine.

What is the warmest month in San Ysidro?

With an average high-temperature of 81.1°F (27.3°C) and an average low-temperature of 66.7°F (19.3°C), August is the warmest month.

What is the least humid month in San Ysidro?

The least humid month is November, with an average relative humidity of 55%.

What is the coldest month in San Ysidro?

The coldest month is December, with an average high-temperature of 64°F (17.8°C) and an average low-temperature of 50.4°F (10.2°C).

What is the month with the shortest days in San Ysidro?

With an average of 10h of daylight, December has the shortest days of the year.

What is the month with the least sunshine in San Ysidro?

December has the least sunshine of the year in San Ysidro, with an average of 6.6h of sunshine.

Average temperature
San Ysidro, CA

Average temperature - San Ysidro, CA

The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (64°F).

The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is February (50.2°F).

[Resources]

Average pressure
San Ysidro, CA

Average pressure - San Ysidro, CA

The month with the highest atmospheric pressure is January (30.08").
Months with the lowest atmospheric pressure are June, August and September (29.88").

[Resources]

Average wind speed
San Ysidro, CA

Average wind speed - San Ysidro, CA

The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).

[Resources]

Average rainfall
San Ysidro, CA

Average rainfall - San Ysidro, CA

The wettest month (with the highest rainfall) is February (1.5").
The driest month (with the least rainfall) is June (0.08").

[Resources]

Average rainfall days
San Ysidro, CA

Average rainfall days - San Ysidro, CA

The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.8 days).

[Resources]

Average daylight / Average sunshine
San Ysidro, CA

Average daylight / Average sunshine - San Ysidro, CA

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.6h).

[Resources]

Average sunshine days
San Ysidro, CA

Average sunshine days - San Ysidro, CA

The month with the most sunshine days is June (27.8 days).
The month with the least sunshine days is February (20.8 days).

[Resources]

Average UV index
San Ysidro, CA

Average UV index - San Ysidro, CA

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 4).

[Resources]

Average visibility
San Ysidro, CA

Average visibility - San Ysidro, CA

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

[Resources]