Santa Rosa weather by month & the best time to visit
United States · seaside town · Mediterranean climate
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The best time to visit Santa Rosa is July — its sunniest month (Sunshine Score 99/100), with August and September close behind. Santa Rosa averages about 3,311 hours of sunshine a year. Daytime highs around 24°C / 75°F and roughly 1 mm of rain in July.
When is the best time to visit Santa Rosa?
For sunshine, the best time to visit Santa Rosa is July, then August and September. The dullest month is January (30/100, 164 mm of rain). The full month-by-month picture is in the table below.
How sunny is Santa Rosa?
Santa Rosa is one of the sunniest places on Earth: about 3,311 hours of sunshine a year. 69 Sunshine Score points separate July (99) from January (30), so the month you pick matters. It ranks #49 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 58% of the annual 931 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 30 | 13° / 55°F | 7° / 45°F | 164 mm | 2 | 13° / 55°F |
| February | 36 | 14° / 57°F | 7° / 45°F | 160 mm | 3 | 13° / 55°F |
| March | 44 | 15° / 59°F | 8° / 46°F | 131 mm | 5 | 13° / 55°F |
| April | 58 | 16° / 61°F | 9° / 48°F | 64 mm | 6 | 13° / 55°F |
| May | 86 | 19° / 66°F | 10° / 50°F | 30 mm | 8 | 12° / 54°F |
| June | 97 | 22° / 72°F | 12° / 54°F | 9 mm | 9 | 13° / 55°F |
| July | 99 | 24° / 75°F | 13° / 55°F | 1 mm | 10 | 15° / 59°F |
| August | 99 | 25° / 77°F | 14° / 57°F | 1 mm | 8 | 14° / 57°F |
| September | 98 | 24° / 75°F | 14° / 57°F | 5 mm | 7 | 16° / 61°F |
| October | 90 | 21° / 70°F | 12° / 54°F | 49 mm | 4 | 15° / 59°F |
| November | 60 | 17° / 63°F | 9° / 48°F | 101 mm | 3 | 12° / 54°F |
| December | 30 | 13° / 55°F | 7° / 45°F | 216 mm | 1 | 12° / 54°F |
Sea temperature in Santa Rosa by month
The sea off Santa Rosa is warmest in September at around 16°C / 61°F, and coolest in May at 12°C / 54°F. It never reaches comfortable swimming temperatures (21°C+). Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Head-to-head
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Santa Rosa: questions and answers
What kind of destination is Santa Rosa?
Santa Rosa is a seaside town in United States with a Mediterranean climate — the sea reaches 16°C at its warmest.
How many hours of sunshine does Santa Rosa get a year?
Santa Rosa gets about 3,311 hours of sunshine a year, at its best around July.
When is the best time to visit Santa Rosa?
The sunniest time to visit Santa Rosa is July, when the Sunshine Score peaks at 99/100 (with August and September close behind). Expect daytime highs around 24°C / 75°F.
What is the least sunny month in Santa Rosa?
January is the least sunny month in Santa Rosa, scoring 30/100 with about 164 mm of rain.
What is the sea temperature in Santa Rosa?
The sea in Santa Rosa ranges from about 12°C (May) to 16°C (September). Month-by-month sea temperatures are on this page.
How strong is the sun in Santa Rosa?
The typical midday UV index in Santa Rosa peaks around 10 (very high) in July, easing to about 1 (low) in December. Month-by-month midday UV values are in the UV column of the table on this page.
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