Santa Rosa weather by month & the best time to visit
🇺🇸 United States · seaside town · Mediterranean climate
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.
Jump to: month-by-month table · sea temperature · nearby alternatives · embed this data
- Sun hours / year
- 3,311
- Sunniest month
- July
- Peak score
- 99/100
- Rain / year
- 931 mm
- Midday UV at peak
- 10 (very high)
- Sea at warmest
- 16°C / 61°F
- Population
- 232k
- Elevation
- 35 m
.jpg)
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.
See Santa Rosa on the interactive sunshine globe →
Nearby places for sunshine
- San Francisco United States · 106 km · best in Sep · 2,879 h sun/yr
- Sacramento United States · 108 km · best in Jun · 3,401 h sun/yr
- Monterey United States · 230 km · best in Aug · 3,366 h sun/yr
- Reno United States · 285 km · best in Aug · 3,499 h sun/yr
- Fresno United States · 334 km · best in May · 3,516 h sun/yr
- San Luis Obispo United States · 412 km · best in Jun · 3,588 h sun/yr
Nearest destinations
- San Carlos United States · 121 km · 2,879 h sun/yr · best in Sep
- Stockton United States · 154 km · 3,452 h sun/yr · best in Jun
- Redding United States · 227 km · 3,250 h sun/yr · best in May
Head-to-head
How Santa Rosa compares month by month: Santa Rosa vs San Francisco · Santa Rosa vs Sacramento · Santa Rosa vs Reno · Santa Rosa vs Monterey · all comparisons
Put the Santa Rosa sunshine badge on your site
A compact badge showing Santa Rosa's sunshine at a glance — free to embed under CC BY 4.0. Paste this wherever you'd like it to appear:
Live preview — this is exactly what your readers see: