May brings 23°C daytime highs, 5mm of precipitation across about 1 wet days and 13.7 hours of daylight — best for hiking, cycling and reliable sunshine. The strongest run of the year is May to July. February is the quietest month: low-key and inexpensive, and still good for hiking, cycling and low-angle light.
Long-run climate normals for San Diego. Month ratings compare months within San Diego only — they are not a ranking of San Diego against other destinations, and they are not a forecast for a specific year.
Last updated: · Live forecast data refreshes hourly.
| Best month | May — Hiking, Cycling, Reliable sunshine |
| Best 3-month window | May–July |
| Quietest month | February — fewest visitors |
| Driest month | July — 1mm |
| Wettest month | January — 48mm |
| Warmest / coolest | July 26°C / February 18°C |
| Seasonality | Fairly even across the year |
| Annual rainfall | 262mm over roughly 40 rain days |
February gets roughly 740% more precipitation than May — 42mm against 5mm. That difference, more than temperature, is what changes how a day here feels.
Daytime highs only move 8°C across the whole year (18–26°C), so timing matters far less here than rainfall does.
June gives you 14.1 hours of daylight against just 9.9 in December — a 4-hour difference in how much you can actually fit into a day.
July is the driest month at 1mm across roughly 1 wet days, while January peaks at 48mm.
June is almost as good as May, but usually quieter and cheaper. If your dates are flexible, it is the easier trip.
San Diego stays fairly consistent all year, so there is no month you need to avoid. What you plan to do matters more than when you go.
Ratings compare months within San Diego, not against destinations worldwide: five stars means the best time to be here, not that San Diego beats anywhere else. Tags describe what the conditions actually suit.
| Month | Rating | High / Low | Precipitation | Wet days | Sun | Daylight | Best for |
|---|---|---|---|---|---|---|---|
| January | ★★☆☆☆ | 18°C / 9°C | 48mm | 8 | 5h | 10.1h | Hiking · Cycling · Low-angle light |
| February | ★★☆☆☆ | 18°C / 9°C | 42mm | 7 | 3h | 10.8h | Hiking · Cycling · Low-angle light |
| March | ★★☆☆☆ | 19°C / 10°C | 40mm | 7 | 3h | 11.8h | Hiking · Cycling · Spring greenery |
| April | ★★★☆☆ | 21°C / 12°C | 19mm | 3 | 4h | 12.9h | Hiking · Cycling · Spring greenery |
| May | ★★★★★ | 23°C / 15°C | 5mm | 1 | 10h | 13.7h | Hiking · Cycling · Reliable sunshine |
| June | ★★★★★ | 25°C / 17°C | 2mm | 1 | 11h | 14.1h | Reliable sunshine |
| July | ★★★★★ | 26°C / 18°C | 1mm | 1 | 11h | 13.9h | Beach days · Swimming · Reliable sunshine |
| August | ★★★★★ | 26°C / 18°C | 2mm | 1 | 11h | 13.2h | Beach days · Swimming · Reliable sunshine |
| September | ★★★★★ | 25°C / 17°C | 5mm | 1 | 11h | 12.2h | Reliable sunshine |
| October | ★★★★★ | 23°C / 15°C | 10mm | 2 | 10h | 11.1h | Hiking · Cycling · Reliable sunshine |
| November | ★★★☆☆ | 21°C / 12°C | 27mm | 4 | 9h | 10.3h | Hiking · Cycling · Reliable sunshine |
| December | ★★☆☆☆ | 19°C / 10°C | 40mm | 7 | 5h | 9.9h | Hiking · Cycling · Low-angle light |
| You are planning | Pick | Why |
|---|---|---|
| Sun & beach days | June | 11h daily sunshine, 25°C highs and only 1 rain days. |
| City walking & sightseeing | May | 23°C highs with 13.7h of daylight — long days without heat fatigue. |
| Photography & light | June | 11h of sun and 14.1h daylight give the widest window for golden-hour work. |
| Value & fewer crowds | September | Scores 92/100 — close to peak conditions but outside the busiest window. |
| Cooler-weather travel | February | 18°C highs and 9°C nights suit anyone who dislikes heat. |
Each month in San Diego is described from long-run climate normals and then rated relative to the other eleven months in the same city. A five-star January in a cold destination means January is one of the best times to be there — not that it beats a Mediterranean summer.
| Factor | Weight | What it measures |
|---|---|---|
| Temperature | Described | Average daytime high and overnight low for the month, shown as measured rather than judged. |
| Precipitation | Described | Monthly millimetres and wet-day count, labelled as snow or rain/snow where temperatures make that the likely phase. |
| Sunshine & daylight | Described | Average daily sunshine hours and astronomical daylight length at mid-month, from the city’s latitude. |
| “Best for” tags | Derived | Applied only when the conditions genuinely support the activity — snow depth-friendly cold for skiing, 13–24°C and low rain risk for hiking, dark evenings at high latitude for aurora. A month with few strong use cases gets fewer tags rather than padded ones. |
| Star rating | Relative | Ranks the month against the other eleven months in the same city. Never a comparison between cities. |
Figures are long-run climate averages, not a forecast for a specific year. Where a month lacks sourced rainfall or humidity, the value is modelled from temperature range and rain frequency.
May is the best all-round month in San Diego: 23°C highs, 5mm of precipitation and 13.7 hours of daylight, which suits hiking, cycling and reliable sunshine. The strongest three-month window is May to July.
February — 18°C highs, 42mm of precipitation over roughly 7 days and 10.8 hours of daylight. It is the cheapest and least crowded time to go, and it still works for hiking, cycling and low-angle light.
July is the driest month at 1mm over about 1 rain days, against 48mm in January. Across the year San Diego records around 262mm.
Yes — conditions in San Diego stay fairly even all year, so there is no month you need to avoid. What you plan to do matters more than when you go.
Daylight ranges from 9.9 hours in December to 14.1 hours in June, calculated from the city's latitude.