Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
August, recording an average high temperature of 81.1°F (27.3°C) and a low temperature of 66.7°F (19.3°C), is San Ysidro's warmest month.Heat index
For August, the heat index is evaluated at 84.2°F (29°C). Long-lasting exposure and activity potentially induce a sense of weariness, with the risk of heat cramps.Take into consideration that the heat index values are calculated for shade and light wind conditions. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values remain especially vital for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Humidity
In August, the average relative humidity is 63%.Rainfall
In San Ysidro, in August, during 3.2 rainfall days, 0.35" (9mm) of precipitation is typically accumulated. Throughout the year, there are 57.8 rainfall days, and 7.28" (185mm) of precipitation is accumulated.Daylight
In August, the average length of the day in San Ysidro is 13h and 19min.On the first day of the month, sunrise is at 6:03 am and sunset at 7:45 pm. On the last day of August, sunrise is at 6:22 am and sunset at 7:13 pm PDT.
Sunshine
In August, the average sunshine is 11.9h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum UV index of 6 during August leads to these instructions:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the warmest months?
What is the average August temperature?
What is the average humidity in August?
How many days does it rain in August?
How many hours of daylight does San Ysidro have in August?
When are sunrise and sunset in August?
How long on average sun shines in August?
What are the months with the highest UV index?
What is the UV index reading in August?
Average temperature in August
San Ysidro, CA
- Average high temperature in August: 81.1°F
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).
- Average low temperature in August: 66.7°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).
Average pressure in August
San Ysidro, CA
- Average pressure in August: 29.88"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.88"Hg).
Average wind speed in August
San Ysidro, CA
- Average wind speed in August: 5.1mph
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).
Average humidity in August
San Ysidro, CA
- Average humidity in August: 63%
The month with the highest relative humidity is May (68%).
The month with the lowest relative humidity is November (55%).
Average rainfall in August
San Ysidro, CA
- Average rainfall in August: 0.35"
The wettest month (with the highest rainfall) is February (1.5").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in August
San Ysidro, CA
- Average rainfall days in August: 3.2 days
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).
Average daylight in August /
Average sunshine in August
San Ysidro, CA
- Average daylight in August: 13h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in August: 11h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in August
San Ysidro, CA
- Average sunshine days in August: 24 days
The month with the most sunshine days is June (27.8 days).
The month with the least sunshine days is February (20.8 days).
Average UV index in August
San Ysidro, CA
- Average UV index in August: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in August
San Ysidro, CA
- Average cloud cover in August: 8
The months with the most cloud cover are March and December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility in August
San Ysidro, CA
- Average visibility in August: 6mi
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).
San Ysidro, California, USA
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