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 |
August has the warmest typical feels-like highs (27.5°C / 81.5°F), while December is coolest (15.5°C / 60°F).
| Month | Low Feels Like | High Feels Like | Category |
|---|---|---|---|
| January | 6.6°C | 15.8°C | MILD |
| February | 7°C | 15.7°C | MILD |
| March | 8.9°C | 17.1°C | MILD |
| April | 10.7°C | 18.6°C | MILD |
| May | 13.1°C | 20.2°C | MILD |
| June | 15.4°C | 23°C | WARM |
| July | 18.7°C | 26.3°C | WARM |
| August | 19.9°C | 27.5°C | WARM |
| September | 19°C | 26.5°C | WARM |
| October | 15.1°C | 22.9°C | WARM |
| November | 10.3°C | 18.9°C | MILD |
| December | 6.8°C | 15.5°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 | -27.6 mm | 62 mm | MODERATE |
| February | -27.6 mm | 75.4 mm | MODERATE |
| March | -27.6 mm | 48.5 mm | LIGHT |
| April | -27.6 mm | 25.1 mm | LIGHT |
| May | -27.6 mm | 12 mm | DRY |
| June | -27.6 mm | 1.8 mm | DRY |
| July | -27.6 mm | 2.1 mm | DRY |
| August | -27.6 mm | 2.7 mm | DRY |
| September | -27.6 mm | 5.7 mm | DRY |
| October | -27.6 mm | 16.4 mm | DRY |
| November | -27.6 mm | 28.8 mm | LIGHT |
| December | -27.6 mm | 50.6 mm | LIGHT |
June has the strongest peak UV (around index 8.7).
| 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.
| 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 |
August is most humid (78.3%), while November is driest (71.6%).
| Month | Baseline | Humidity (avg) | Category |
|---|---|---|---|
| January | 69.3% | 74.3% | HUMID |
| February | 69.3% | 74.8% | HUMID |
| March | 69.3% | 77.2% | MUGGY |
| April | 69.3% | 73.8% | HUMID |
| May | 69.3% | 74.6% | HUMID |
| June | 69.3% | 76.9% | MUGGY |
| July | 69.3% | 78.3% | MUGGY |
| August | 69.3% | 78.3% | MUGGY |
| September | 69.3% | 77.9% | MUGGY |
| October | 69.3% | 74.3% | HUMID |
| November | 69.3% | 71.6% | HUMID |
| December | 69.3% | 73.5% | HUMID |
May has the strongest typical average wind (10.1 km/h / 6.3 mph), while November is calmest (7.9 km/h / 4.9 mph).
| Month | Baseline | Wind (avg) | Category |
|---|---|---|---|
| January | 7.1 km/h | 8.4 km/h | CALM |
| February | 7.1 km/h | 9.4 km/h | CALM |
| March | 7.1 km/h | 9.4 km/h | CALM |
| April | 7.1 km/h | 10.1 km/h | CALM |
| May | 7.1 km/h | 10.1 km/h | CALM |
| June | 7.1 km/h | 9.8 km/h | CALM |
| July | 7.1 km/h | 9.6 km/h | CALM |
| August | 7.1 km/h | 9.3 km/h | CALM |
| September | 7.1 km/h | 9 km/h | CALM |
| October | 7.1 km/h | 8.2 km/h | CALM |
| November | 7.1 km/h | 7.9 km/h | CALM |
| December | 7.1 km/h | 8.1 km/h | CALM |
February is windiest by P95 gust signal (43.6 km/h / 27.1 mph).
| Month | Baseline | Wind (gusts) | Category |
|---|---|---|---|
| January | 0 km/h | 37.4 km/h | WINDY |
| February | 0 km/h | 43.6 km/h | WINDY |
| March | 0 km/h | 41.4 km/h | WINDY |
| April | 0 km/h | 41.8 km/h | WINDY |
| May | 0 km/h | 39.2 km/h | WINDY |
| June | 0 km/h | 37.1 km/h | WINDY |
| July | 0 km/h | 36.7 km/h | WINDY |
| August | 0 km/h | 36.7 km/h | WINDY |
| September | 0 km/h | 37.1 km/h | WINDY |
| October | 0 km/h | 35.6 km/h | WINDY |
| November | 0 km/h | 35.6 km/h | WINDY |
| December | 0 km/h | 37.1 km/h | WINDY |
February has the most rain days (~7.7), while August has the fewest (~0.5). Rain days count the average number of days in a month with measurable rain (about 0.1 mm or more).
| Month | Baseline | Rain Days | Category |
|---|---|---|---|
| January | -2.3 days | 7 days | SOME |
| February | -2.3 days | 7.7 days | SOME |
| March | -2.3 days | 7.3 days | SOME |
| April | -2.3 days | 5.8 days | SOME |
| May | -2.3 days | 3.5 days | RARE |
| June | -2.3 days | 1 days | RARE |
| July | -2.3 days | 0.6 days | RARE |
| August | -2.3 days | 0.5 days | RARE |
| September | -2.3 days | 1.5 days | RARE |
| October | -2.3 days | 3.7 days | RARE |
| November | -2.3 days | 4.4 days | SOME |
| December | -2.3 days | 6.3 days | SOME |
February has the most heavy rain/washout risk days (~4). Heavy rain days are the average number of days likely to bring stronger downpours that can disrupt outdoor plans.
| Month | Baseline | Heavy Rain Days | Category |
|---|---|---|---|
| January | 0 days | 3 days | FREQUENT |
| February | 0 days | 4 days | FREQUENT |
| March | 0 days | 3 days | FREQUENT |
| April | 0 days | 1 days | OCCASIONAL |
| May | 0 days | 0 days | RARE |
| June | 0 days | 0 days | RARE |
| July | 0 days | 0 days | RARE |
| August | 0 days | 0 days | RARE |
| September | 0 days | 0 days | RARE |
| October | 0 days | 1 days | OCCASIONAL |
| November | 0 days | 1 days | OCCASIONAL |
| December | 0 days | 3 days | FREQUENT |
September has the highest heat-risk day count (~1 days). Heat days are the average number of days that exceed our location-specific heat-risk threshold.
| Month | Baseline | Heat Days | Category |
|---|---|---|---|
| January | 0 days | 0 days | LOW |
| February | 0 days | 0 days | LOW |
| March | 0 days | 0 days | LOW |
| April | 0 days | 0 days | LOW |
| May | 0 days | 0 days | LOW |
| June | 0 days | 0 days | LOW |
| July | 0 days | 0 days | LOW |
| August | 0 days | 0 days | LOW |
| September | 0 days | 1 days | LOW |
| October | 0 days | 0 days | LOW |
| November | 0 days | 0 days | LOW |
| December | 0 days | 0 days | LOW |
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:
A month-by-month ranking of key weather risks and comforts for this destination, based on historical climate data.
| Ranking Goal | #1 | #2 | #3 | #4 |
|---|---|---|---|---|
| Lowest rain risk | May 0 risk days | Jun 0 risk days | Jul 0 risk days | Aug 0 risk days |
| Lowest heatwave risk | Jan 0 risk days | Feb 0 risk days | Mar 0 risk days | Apr 0 risk days |
| Lowest cold risk | May 0 risk days | Jun 0 risk days | Jul 0 risk days | Aug 0 risk days |
| Lowest wind disruption risk | Oct 36 km/h | Nov 36 km/h | Jul 37 km/h | Aug 37 km/h |
| Most comfortable evenings | Jul 88 / 100 | Sep 85 / 100 | Aug 83 / 100 | Jun 82 / 100 |
| Best outdoor reliability | Jul 97 / 100 | Aug 97 / 100 | Jun 96 / 100 | May 91 / 100 |
Click any month for detailed weather information and packing advice.
Get personalized month rankings based on weather comfort, outdoor activity suitability, and seasonal conditions.
Travel planning FAQ
Quick answers to the weather questions you ask the most.
The 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.