Temperatures stay fairly stable month to month across the year.
| Month | Low Temperature | High Temperature | Category |
|---|---|---|---|
| January | 8.6°C | 17.5°C | MILD |
| February | 9°C | 17.3°C | MILD |
| March | 10.3°C | 17.9°C | MILD |
| April | 11.8°C | 19.1°C | MILD |
| May | 13.6°C | 20.1°C | MILD |
| June | 15.1°C | 22°C | MILD |
| July | 17.4°C | 24.3°C | WARM |
| August | 18.2°C | 25.4°C | WARM |
| September | 17.7°C | 25.1°C | WARM |
| October | 15°C | 23.1°C | WARM |
| November | 11.6°C | 20.4°C | MILD |
| December | 8.8°C | 17.5°C | MILD |
February is wettest at 75.4 mm / 2.97 inches, while June is driest at 1.8 mm / 0.07 inches.
| Month | Baseline | Rainfall | Category |
|---|---|---|---|
| January | 0 mm | 62 mm | MODERATE |
| February | 0 mm | 75.4 mm | MODERATE |
| March | 0 mm | 48.5 mm | LIGHT |
| April | 0 mm | 25.1 mm | LIGHT |
| May | 0 mm | 12 mm | DRY |
| June | 0 mm | 1.8 mm | DRY |
| July | 0 mm | 2.1 mm | DRY |
| August | 0 mm | 2.7 mm | DRY |
| September | 0 mm | 5.7 mm | DRY |
| October | 0 mm | 16.4 mm | DRY |
| November | 0 mm | 28.8 mm | LIGHT |
| December | 0 mm | 50.6 mm | LIGHT |
June has the strongest UV (about index 8.7), rated very high.
| Month | Baseline | UV Index | Category |
|---|---|---|---|
| January | 0 | 4.7 | MODERATE |
| February | 0 | 6 | HIGH |
| March | 0 | 7.3 | HIGH |
| April | 0 | 8.2 | VERY HIGH |
| May | 0 | 8.5 | VERY HIGH |
| June | 0 | 8.7 | VERY HIGH |
| July | 0 | 8.7 | VERY HIGH |
| August | 0 | 8.5 | VERY HIGH |
| September | 0 | 7.8 | HIGH |
| October | 0 | 6.6 | HIGH |
| November | 0 | 5.2 | MODERATE |
| December | 0 | 4 | MODERATE |
Daylight ranges from 10h in December to 14.3h in June, a 4.2h difference.
| Month | Baseline | Daylight Hours | Category |
|---|---|---|---|
| January | 0h | 10.3h | BALANCED |
| February | 0h | 11h | BALANCED |
| March | 0h | 12h | BALANCED |
| April | 0h | 13h | LONG |
| May | 0h | 13.9h | LONG |
| June | 0h | 14.3h | LONG |
| July | 0h | 14.1h | LONG |
| August | 0h | 13.3h | LONG |
| September | 0h | 12.4h | BALANCED |
| October | 0h | 11.4h | BALANCED |
| November | 0h | 10.5h | BALANCED |
| December | 0h | 10h | BALANCED |
Daylight varies from 10 hours in December (winter) to 14.3 hours in June (summer), which is a difference of 4.3 hours.
Northern Hemisphere seasons shape the weather patterns throughout the year. Here's what to expect in each season:
Click any month for detailed weather information and packing advice.
Get personalized month rankings based on weather comfort, outdoor activity suitability, and seasonal conditions.
View Best Time to VisitThe best months to visit San Diego depend on your preferences. For warm weather, August is typically the warmest month. For dry conditions, June, July, August tend to have the least rainfall. Consider your priorities, and whether you prefer warmer temperatures, drier weather, or longer daylight hours.
August is typically the warmest month in San Diego, with average high temperatures reaching around 25°C (77°F). This is peak summer weather, ideal for outdoor activities and sightseeing.
January is usually the coldest month, with average low temperatures dropping to around 9°C (48°F). Pack warm layers if visiting during this time, especially for evening activities.
February typically sees the most rainfall in San Diego, averaging around 75mm (3.0 inches). It's wise to pack waterproof layers and have some indoor backup plans if you're visiting during this month.
June is typically the driest month, with average rainfall of just 2mm (0.1 inches). This makes it an excellent time for outdoor exploration and activities with minimal risk of rain disruption.
Temperatures in San Diego range from average lows of 13°C (56°F) to highs of 21°C (69°F). This variation means you'll want to pack differently depending on when you visit, as layers are key for adapting to the seasonal changes.
Yes, sun protection is important in San Diego. UV levels can reach 9 during peak months, which is considered very high. Pack sunscreen (SPF 30+), sunglasses, and a hat, especially if you'll be outdoors for extended periods.