Santa Rosa Weather in September

Santa Rosa in September averages 28°C (82°F) during the day and 11°C (52°F) at night. This is part of the summer season. Minimal rainfall is to be expected.

Rainfall in Santa Rosa in September

Typically around 2 days of rainfall are expected, averaging 5.8 mm (0.2 in) for the month. Any rain that does arrive is likely to be light drizzle rather than a proper shower.

Temperature in Santa Rosa in September

The perfect temperature in Santa Rosa in September makes it a solid month to visit, with 28°C (82°F) during the day and 11°C (52°F) at night. September is part of summer. Overall, the month follows a fairly predictable daily temperature pattern. With overnight lows of 11°C (52°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep. On average, it is the warmest month of the year.

Sunshine in Santa Rosa in September

The city usually sees around 275 hours of sunlight, indicating many sunny days — a great month for sightseeing.

If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Santa Rosa.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Santa Rosa's climate page.

Santa Rosa Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 28°C (82°F)  

Chance of Rain 6%  

Precipitation 5.8 mm (0.2 in)  

Rainy days 2 days  

Sunshine 275 hours *  

Percentage Sunshine 77% *  

* Data from: Healdsburg, the United States of America (23 KM, 14 Miles).

What to Wear in Santa Rosa in September

Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. With minimal rainfall expected, you can leave the rain gear at home. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Santa Rosa in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

8/10

Walking

8/10

Barbeque

10/10

Camping

10/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Santa Rosa's climate page.

More climate data for Santa Rosa

Temperature Rainfall Sunshine

See the full Santa Rosa climate overview or explore weather in the United States of America.