Measured, not vibes
Best Time to Visit San Diego
By measured weather comfort, the top months for San Diego are July, June, October — and RouteVerdict's editorial pick, which also weighs crowds and prices, is March, April, May, September, October, November. The table below is computed from ERA5 reanalysis data for 2020–2024, measured at San Diego (20 m elevation).
Month by month
San Diego weather and comfort, 2020–2024
| Month | Avg high | Wet days | Comfort | Season |
|---|---|---|---|---|
| January | 17.4°C / 63°F | 5.5 | 73 | |
| February | 17.9°C / 64°F | 4.7 | 77 | |
| March | 17.4°C / 63°F | 8.8 | 68 | |
| April | 19.3°C / 67°F | 2.8 | 87 | |
| May | 20.2°C / 68°F | 1.2 | 93 | |
| June | 22.2°C / 72°F | 0.5 | 99 | Best |
| July | 24.2°C / 76°F | 0.2 | 99 | Best |
| August | 25.5°C / 78°F | 0.7 | 95 | Shoulder |
| September | 25.6°C / 78°F | 1.2 | 94 | |
| October | 23.9°C / 75°F | 1.8 | 96 | Best |
| November | 21°C / 70°F | 2.5 | 93 | |
| December | 18°C / 64°F | 3.7 | 79 | Shoulder |
Comfort is RouteVerdict's 0–100 score: 100·exp(−(high−23)²/162) × (1 − min(0.35, wet days × 0.02)). The full method is on the methodology page. Weather data by Open-Meteo.com (ERA5, CC BY 4.0), 2020–2024 normals. Wet day = ≥1 mm precipitation.
What the seasons are actually like
Traveling to San Diego month by month
San Diego's comfort score peaks in July at 98.7, with an average high of 24.2°C and just 0.2 wet days, narrowly ahead of June's 98.6 and October's 95.9. Even its lowest-scoring month, March, still comes in at 67.9 — comfort never drops far here. RouteVerdict's editorial pick skips the measured summer peak, instead spanning March through May and September through November.
FAQ
San Diego timing questions
What is the best month to visit San Diego?
By measured weather comfort (ERA5 2020–2024), the top months are July, June, and October, with July scoring highest. RouteVerdict's editorial pick is March, April, May, September, October, and November, which also weighs crowds, prices, and events.
What is the hottest month in San Diego?
September, with an average daily high of 25.6°C (78°F).
What is the rainiest month in San Diego?
March, averaging 8.8 days with at least 1 mm of precipitation.
When is shoulder season in San Diego?
August and December — the best-scoring months outside both the measured top three and RouteVerdict's editorial peak-season pick.
Is there ever an uncomfortable month to visit San Diego?
Rarely — its lowest-scoring month, March, still has a comfort score of 67.9. July and June, the peaks, score 98.7 and 98.6.
What is San Diego's single best month for weather?
July, with an average high of 24.2°C, just 0.2 wet days, and a comfort score of 98.7 — the highest measured for any month.