Hormones are chemical messengers released from endocrine glands that travel through the blood system to influence the nervous system to regulate behaviors such as aggression, mating, and parenting of individuals. 1  Aggression. 2  Hormones. 3  Parental behaviors. 4  Sex differences. 5  Sexual behavior. 6  Steroids.
San Francisco International Airport Weather Today (1â3 days) Mostly dry. Very mild (max 17Â°C on Tue morning, min 9Â°C on Tue night). Wind will be generally light. San Francisco International Airport Weather (4â7 days) Mostly dry. Very mild (max 19Â°C on Fri afternoon, min 12Â°C on Thu night). Wind will be generally light. 10 Day San Francisco International Airport Weather (7â10 days) Mostly dry. Very mild (max 20Â°C on Tue afternoon, min 13Â°C on Sun night). Wind will be generally light.
San Francisco: Annual Weather Averages. July is the hottest month in San Francisco with an average temperature of 14Â°C (57Â°F) and the coldest is January at 10Â°C (50Â°F) with the most daily sunshine hours at 14 in July. The wettest month is January with an average of 119mm of rain. The best month to swim in the sea is in August when the average sea temperature is 15Â°C (59Â°F).