San Carlos weather by month & the best time to visit
🇺🇸 United States · seaside town · oceanic / maritime climate
The best time to visit San Carlos is September — its sunniest month (Sunshine Score 87/100), with October and August close behind. San Carlos averages about 2,879 hours of sunshine a year. Daytime highs around 19°C / 66°F and roughly 4 mm of rain in September.
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- Sun hours / year
- 2,879
- Sunniest month
- September
- Peak score
- 87/100
- Rain / year
- 515 mm
- Midday UV at peak
- 9 (very high)
- Sea at warmest
- 17°C / 63°F
- Population
- 30k
- Elevation
- Sea level
When is the best time to visit San Carlos?
For sunshine, the best time to visit San Carlos is September, then October and August. The dullest month is January (33/100, 88 mm of rain). The full month-by-month picture is in the table below.
How sunny is San Carlos?
San Carlos gets a lot of sun: around 2,879 hours a year. 54 Sunshine Score points separate September (87) from January (33), so the month you pick matters. It ranks #105 of 580 destinations in United States for annual sunshine, above the national median of 2,279 hours. Rain has a clear season: the wettest stretch, around January, carries about 57% of the annual 515 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 33 | 13° / 55°F | 9° / 48°F | 88 mm | 2 | 13° / 55°F |
| February | 40 | 14° / 57°F | 9° / 48°F | 88 mm | 3 | 14° / 57°F |
| March | 41 | 14° / 57°F | 10° / 50°F | 74 mm | 5 | 14° / 57°F |
| April | 52 | 15° / 59°F | 10° / 50°F | 38 mm | 7 | 14° / 57°F |
| May | 54 | 15° / 59°F | 11° / 52°F | 17 mm | 8 | 14° / 57°F |
| June | 71 | 17° / 63°F | 12° / 54°F | 6 mm | 9 | 15° / 59°F |
| July | 72 | 17° / 63°F | 13° / 55°F | 2 mm | 9 | 17° / 63°F |
| August | 80 | 18° / 64°F | 14° / 57°F | 2 mm | 8 | 17° / 63°F |
| September | 87 | 19° / 66°F | 14° / 57°F | 4 mm | 6 | 17° / 63°F |
| October | 84 | 19° / 66°F | 13° / 55°F | 26 mm | 5 | 16° / 61°F |
| November | 57 | 16° / 61°F | 11° / 52°F | 55 mm | 3 | 13° / 55°F |
| December | 37 | 14° / 57°F | 9° / 48°F | 115 mm | 2 | 13° / 55°F |
Sea temperature in San Carlos by month
The sea off San Carlos is warmest in July at around 17°C / 63°F, and coolest in January at 13°C / 55°F. It never reaches comfortable swimming temperatures (21°C+). Month-by-month sea-surface temperatures are in the Sea column of the table above.
See San Carlos on the interactive sunshine globe →
Nearby places for sunshine
- San Francisco United States · 16 km · best in Sep · 2,879 h sun/yr
- Monterey United States · 109 km · best in Aug · 3,366 h sun/yr
- Santa Rosa United States · 121 km · best in Jul · 3,311 h sun/yr
- Sacramento United States · 144 km · best in Jun · 3,401 h sun/yr
- Fresno United States · 239 km · best in May · 3,516 h sun/yr
- San Luis Obispo United States · 291 km · best in Jun · 3,588 h sun/yr
Nearest destinations
- Stockton United States · 99 km · 3,452 h sun/yr · best in Jun
- Merced United States · 156 km · 3,486 h sun/yr · best in May
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