Climate Chart of San Diego, USA
Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023
For San Diego, USA, the climate data cover 2013–2023. Monthly mean temperatures average 17.2 °C, with the coolest monthly mean in January at 13.2 °C and the warmest in August at 21.8 °C. Mean daily rainfall averages 0.85 mm/day, while mean daily sunshine averages 10.15 hours/day. Together, these figures offer a broad guide to the year's typical pattern, while monthly averages cannot describe the conditions of every day.
Climate overview
Temperature
The monthly mean temperature reaches its highest point in August at 21.8 °C; this is a monthly average, not a daytime high, so it does not indicate the warmest temperature a visitor might experience. The lowest monthly mean is in January at 13.2 °C. Across the calendar months, the unweighted mean of monthly means is 17.2 °C; these summaries describe typical monthly conditions, not day-by-day temperature swings.
Rain
Mean daily rainfall is highest in January at 1.98 mm/day. This is a daily mean for the month, not a monthly accumulation, and it does not show how often rain falls or guarantee rain on any particular day. The lowest monthly mean daily rainfall occurs in June at 0.05 mm/day. The unweighted mean across monthly daily means is 0.85 mm/day; neither figure gives a visitor a forecast or establishes the frequency of wet days.
Sunshine
Mean daily sunshine duration peaks in July at 12.00 hours/day, while its lowest monthly mean is in December at 7.88 hours/day. These averages can help with broad outdoor-planning expectations, but sunshine duration is not the same as day length. The unweighted mean of monthly mean daily sunshine duration is 10.15 hours/day. It summarizes the calendar-month averages rather than guaranteeing how much sun any individual day will receive.
Best Travel Time Guide for San Diego, USA: Ideal Seasons and Weather Insights
For visitors prioritising cooler monthly averages, January is the option to consider: its monthly mean temperature is 13.2 °C, which does not specify daytime highs or the range of conditions on individual days. Those prioritising lower average rainfall can consider June, when mean daily rainfall is 0.05 mm/day. This lower average does not guarantee dry days or indicate how frequently rain occurs; for rain preparation, note that the highest monthly mean daily rainfall is in January at 1.98 mm/day. For outdoor plans guided by average sunshine duration, July has the highest mean at 12.00 hours/day, while December has the lowest at 7.88 hours/day. These figures can inform broad daylight planning, but sunshine duration is not day length and does not predict the conditions on a particular date.
Climate Data Overview for San Diego, USA
Explore the comprehensive climate data for San Diego, USA. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.
| Month | Average: Temperature °C | Rain (mm) / day | Snow (mm) / day | Sunshine (h) / day |
|---|---|---|---|---|
| Jan | 13.2 | 1.98 | 0.00 | 8.21 |
| Feb | 13.5 | 1.59 | 0.00 | 9.25 |
| Mar | 14.5 | 1.52 | 0.00 | 9.97 |
| Apr | 16.1 | 0.63 | 0.00 | 10.93 |
| May | 16.9 | 0.53 | 0.00 | 11.13 |
| Jun | 18.8 | 0.05 | 0.00 | 11.84 |
| Jul | 21.0 | 0.14 | 0.00 | 12.00 |
| Aug | 21.8 | 0.24 | 0.00 | 11.44 |
| Sep | 21.6 | 0.33 | 0.00 | 10.58 |
| Oct | 19.6 | 0.41 | 0.00 | 9.70 |
| Nov | 16.4 | 0.95 | 0.00 | 8.87 |
| Dec | 13.5 | 1.88 | 0.00 | 7.88 |
| Average | 17.2 | 0.85 | 0.00 | 10.15 |
