A San Diego 7 day weather forecast usually ends being extremely accurate. This is because San Diego has some of the the best weather in the world and it usually does not change much day to day.
Temperatures rarely get too cold or hot and there are so many days of bright sunshine, light winds and cloudless skies that you get spoiled.
The best weather is from July through November with October being my favorite month. Hint! - I would not recommend May or June as the night and morning low clouds, that often plaque Southern California cities during this time of the year, usually do not burn off all day. In addition, they can produce a light mist or drizzle making a beach visit fairly miserable. However, if you enjoy clouds with little sunshine, this is your time to visit.
Hint -If you want to stay near the beach in May or June, try picking a hotel a few miles inland such as Harbor Island, Downtown San Diego or Aviara Resort and Spa in Carlsbad. Often times the clouds will hang directly over the beach but not the bay. By moving inland just a little, sometimes even a few blocks, you increase your chances of getting beautiful sunshine to enjoy the resort pool.
Some of the most beautiful San
Diego weather is during October, November and December. While nights
can be cool and it will probably rain some, days are usually crystal
clear with light winds, warm sunshine and high temperatures in the 70 and 80s.
If you live in a cold weather climate, this can be the best time to
visit San Diego to take the edge off of winter. This is also the off
season for tourism and results in less crowds and some lower prices. If
you are a football fan and one of your teams is playing the Chargers,
this is the perfect opportunity to spend a three or four day weekend
visiting America's finest city.
Often times winter months can see lows in the 30s and 40s but daytime highs will be in the 80s, 90s and occasionally above 100. It is not uncommon to see a period of a week or two in the winter where the temperature spread between night and day is 40 to 50 degrees.
Consistent with the rest of Southern California, the rainy months are January, February and March with the most rain occurring in February. The average yearly rainfall is around 10 inches. San Diego has seen as little as 3 inches to almost 30 inches in a year. Rainfall amounts will also increase as you move inland with the most rain occurring on the mountain slopes, about 50 miles east of Downtown San Diego.
If there is one thing that results in an inaccurate San Diego forecast, its the rainfall amount. Often times rain is predicted but never arrives or the amounts are much less than predicted. It is common for storms to deteriorate as they make their way down from the northwest. San Diego rarely has any surprise storms and the ones that do occur are usually in August and September and the result of thunderstorms that form in the deserts and mountains and drift towards the inland valleys and beaches.
Weird summer day in San Diego. Lots of rain and thunderstorms. El Nino is definitely on the way. Shown is the Hotel Del Coronado with lightning strike to the west.Posted by href="https://www.facebook.com/BeachVacationsFirsthand">Beach Vacations Firsthand on Sunday, July 19, 2015
While infrequent, there
also can be an occasional thunderstorm in July, August or September as
cumulus clouds build in the desert and push their way up and over the
San Diego mountains to the coast. The San Diego forecast for
inland, mountain and desert areas during this time can be hit and miss
due to the unpredictable nature of thunderstorms.
There can also be 1 to 2 weeks of uncomfortable humidity levels, usually August or September, due to the thunderstorms and the combined proximity to the Pacific Ocean.
Compared to the Caribbean and Hawaii, San Diego water is relatively cold. Water temperatures along the San Diego coastline peak around 70 degrees in August and September to the high 50s in the winter months while remaining in the mid to high 60s for the majority of the year.
The northern most beaches of La Jolla, Del Mar and Carlsbad will have summer water temperatures a few degrees warmer than southern beaches such as Imperial, Silver Strand, Coronado and Mission beaches.
If you are a surfer or enjoy water sports, with the exception of late summer months, you may want to consider bringing a wet suit.
The top ten hottest days in downtown San Diego have all occurred in either September or October due to the Santa Ana winds that compress and heat as they blow from the desert, drop down over the mountains and head towards the coast. The all time record high was 111 degrees on September 26, 1963 and record low was 25 on January 7, 1913. It is not uncommon for temperatures in the early fall to be at or near 100 degrees although this usually lasts for only 2-3 days. It is also not uncommon for lows to be near or below freezing for a few weeks in December or January in the San Diego inland valleys, just 15 or 20 miles inland.
Usually when very high or low temperatures occur, the humidity is often very low, less than 10%, even along the coast.
San Diego can experience what is called a long thermometer in the winter, where nights are in the low 30s and days heat up to near 90. When this happens, skies are clear and the humidity is low.