San Diego vs Tijuana: which is sunnier?
🇺🇸 United States vs 🇲🇽 Mexico · 30 km apart · long-term climate normals (NASA POWER, 2001–2020)
Tijuana is the sunnier overall: about 3,734 hours of sunshine a year to San Diego's 2,854. Tijuana has the higher Sunshine Score in 12 of 12 months — a clean sweep.
Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.
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At a glance
| San Diego | Tijuana | |
|---|---|---|
| Sunshine hours / year | 2,854 | 3,734 |
| Sunniest month | July (95/100) | May (99/100) |
| Nov–Feb average score | 68/100 | 85/100 |
| Jun–Aug average score | 89/100 | 98/100 |
| Rain / year | 269 mm | 268 mm |
| Warmest sea | 22°C / 72°F | 22°C / 72°F |
| Peak midday UV | 9 (very high) | 10 (very high) |
San Diego vs Tijuana month by month
| Month | Sunshine Score | Day high °C | Rain mm | Sea °C | ||||
|---|---|---|---|---|---|---|---|---|
| San Diego | Tijuana | San Diego | Tijuana | San Diego | Tijuana | San Diego | Tijuana | |
| January | 66 | 85 | 17° | 19° | 42 | 41 | 16° | 16° |
| February | 58 | 82 | 16° | 19° | 52 | 55 | 16° | 16° |
| March | 60 | 95 | 16° | 21° | 29 | 29 | 16° | 17° |
| April | 70 | 97 | 17° | 22° | 17 | 17 | 17° | 17° |
| May | 71 | 99 | 17° | 24° | 7 | 7 | 18° | 19° |
| June | 76 | 97 | 18° | 27° | 26 | 14 | 20° | 20° |
| July | 95 | 99 | 20° | 30° | 4 | 4 | 22° | 22° |
| August | 95 | 99 | 21° | 31° | 2 | 4 | 22° | 21° |
| September | 95 | 99 | 22° | 30° | 5 | 6 | 22° | 22° |
| October | 93 | 97 | 21° | 26° | 14 | 15 | 19° | 19° |
| November | 84 | 95 | 19° | 22° | 23 | 25 | 17° | 17° |
| December | 65 | 76 | 17° | 18° | 48 | 51 | 15° | 14° |
The sunnier month by month: Jan Tijuana · Feb Tijuana · Mar Tijuana · Apr Tijuana · May Tijuana · Jun Tijuana · Jul Tijuana · Aug Tijuana · Sep Tijuana · Oct Tijuana · Nov Tijuana · Dec Tijuana.
When to pick which
- November–February: Tijuana (average score 85/100 vs 68). Tijuana is the warmer, around 20°C daytime highs vs 17°C. See the winter sun ranking.
- March–May: Tijuana (average score 97/100 vs 67). Tijuana is the warmer, around 22°C daytime highs vs 17°C.
- June–August: Tijuana (average score 98/100 vs 89). Tijuana is the warmer, around 29°C daytime highs vs 20°C.
- September–October: Tijuana (average score 98/100 vs 94). Tijuana is the warmer, around 28°C daytime highs vs 22°C.
Sea temperature
Both seas peak at 22°C / 72°F. Swimmable water (21°C+): San Diego about 3 months a year, Tijuana about 3 months a year. Month-by-month sea temperatures are in the table above.
Full month-by-month guides: San Diego weather by month · Tijuana weather by month · Best time to visit United States · Best time to visit Mexico.
More comparisons: San Diego vs Los Angeles · San Diego vs Mexicali · San Diego vs Ontario · Tijuana vs Mexicali · Tijuana vs Palm Springs · all head-to-heads