San Diego, CA restaurant weather by month
| Month | Avg high | Avg low | Rainy days | Muggy days | Patio-friendly days |
|---|---|---|---|---|---|
| January | 66° | 50° | 4 | 0 | 15 |
| February | 67° | 51° | 3 | 0 | 15 |
| March | 66° | 54° | 4 | 0 | 16 |
| April | 69° | 57° | 1 | 0 | 24 |
| May | 68° | 60° | 1 | 0 | 27 |
| June | 71° | 63° | 0 | 1 | 30 |
| July | 76° | 67° | 0 | 9 | 31 |
| August | 78° | 68° | 0 | 18 | 30 |
| September | 78° | 67° | 1 | 13 | 27 |
| October | 76° | 61° | 1 | 3 | 29 |
| November | 72° | 54° | 2 | 0 | 25 |
| December | 67° | 50° | 3 | 0 | 18 |
Averages of daily observations at San Diego International Airport (SAN), 2016–2025. Rainy day: 0.10″ of rain or more. Muggy day: dew point reached 65°F or higher. Patio-friendly day: high between 65°F and 88°F, less than 0.05″ of rain, and average wind under about 14 mph. Highlighted rows are the three best patio months. Your neighborhood can differ from the airport, especially near water or downtown.
What it means for your restaurant
- Patio weather is a year-round asset here. Every month averages at least 12 patio-friendly days, so outdoor seating is worth staffing and marketing in every season — watch the forecast for the exceptions rather than the rule.
- Get ready for the jump into April. Patio-friendly days rise by about 8 from March to April — the biggest month-to-month change of the year. Have patio furniture, staffing and outdoor menus ready before the first warm stretch, not after it.
- January is the wettest month, averaging about 4 days with 0.1″ or more of rain. That’s the month to have a takeout and delivery push ready to go, and to keep an on-call shift you can release if a storm hits at dinner.
- Humidity matters as much as temperature in August. About 18 days that month reach a dew point of 65°F or higher, when it feels sticky even at moderate temperatures. Guests will drift indoors faster than the thermometer suggests.
Where San Diego forecasts come from
San Diego is covered by the National Weather Service forecast office SGX. Several times a day, its forecasters publish an Area Forecast Discussion — a plain-text explanation of what they expect, when, and how confident they are. It’s the most useful forecast product most restaurant managers have never read. Our guide on how to read a forecast discussion walks through it, and GuestFlow Weather reads it for you every morning.
Averages tell you what to plan for this season. What you need each morning is what today will do — and that’s where a daily briefing helps. For the bigger picture, see how rain affects restaurant traffic and the best weather for patio dining.