Santa Rosa weather by month
Santa Rosa, nestled in the heart of Sonoma County, California, boasts a Mediterranean climate renowned for its mild, wet winters and warm, dry summers. But the weather isn’t consistent year-round! Understanding the nuances of Santa Rosa’s weather by month can help you plan the perfect visit, or simply prepare for what Mother Nature has in store. This guide provides a detailed breakdown of what to expect throughout the year, ensuring you’re always ready to enjoy all that Sonoma County offers.
January: Cool & Rainy Beginnings
January is typically the coolest and wettest month in Santa Rosa. Expect average high temperatures around 57°F (14°C) and lows around 41°F (5°C). Rainfall is frequent, averaging around 5.5 inches. While not ideal for sunbathing, January offers a cozy atmosphere perfect for wine tasting by the fireplace or exploring indoor attractions. It’s also a good time for pruning in the vineyards!
February: Lingering Winter Showers
February continues the pattern of cool temperatures and rainfall, though typically slightly less than January. Average highs reach 60°F (16°C) and lows dip to 43°F (6°C). Expect around 4.5 inches of rain. The landscape is lush and green, and the hills are particularly beautiful. Keep an eye out for early blooming wildflowers.
March: Transition to Spring
March marks the beginning of the transition to spring. Temperatures begin to rise, with average highs around 64°F (18°C) and lows around 46°F (8°C). Rainfall decreases to approximately 3.5 inches. Bud break in the vineyards begins, signaling the start of the growing season. This is a lovely time for hiking and enjoying the blossoming fruit trees.
April: Blossoms & Sunshine
April is a beautiful month in Santa Rosa, with blossoming trees and increasing sunshine. Average highs climb to 69°F (21°C) and lows to 49°F (9°C). Rainfall drops significantly to around 2 inches. The vineyards are vibrant with new growth, and outdoor activities become more appealing.
May: Warm Days & Pleasant Evenings
May offers warm, sunny days and pleasant evenings. Average highs reach 74°F (23°C) and lows around 53°F (12°C). Rainfall is minimal, typically less than 1 inch. This is an excellent time for exploring the Russian River, enjoying outdoor dining, and attending local events.
June: The Start of Summer Dry Season
June signals the start of Santa Rosa’s dry summer season. Average highs reach 79°F (26°C) and lows around 57°F (14°C). Rainfall is rare. The days are long and sunny, perfect for wine tasting, hiking, and enjoying the outdoors.
July: Hot & Dry Summer Peak
July is typically the hottest month of the year in Santa Rosa. Average highs reach 84°F (29°C) and lows around 60°F (16°C). No rainfall is expected. It’s important to stay hydrated and seek shade during the hottest part of the day. Evenings are warm and perfect for outdoor concerts and events.
August: Continued Warmth
August continues the pattern of hot, dry weather. Average highs remain around 83°F (28°C) and lows around 60°F (16°C). The vineyards are thriving, and harvest season is beginning. This is a popular time for tourism, so expect larger crowds.
September: Harvest Season & Golden Light
September is arguably the most beautiful month in Santa Rosa, with warm days, cool evenings, and the vibrant colors of harvest season. Average highs are around 80°F (27°C) and lows around 58°F (14°C). Rainfall is still very rare. The air is filled with the aroma of grapes, and the vineyards are bustling with activity.
October: Mild Temperatures & Fall Foliage
October offers mild temperatures and the beginning of fall foliage. Average highs are around 74°F (23°C) and lows around 53°F (12°C). A slight increase in rainfall is possible, but it’s usually minimal. This is a great time for wine tasting, hiking, and enjoying the changing colors of the landscape.
November: Return of the Rain
November marks the return of the rain. Average highs are around 64°F (18°C) and lows around 46°F (8°C). Rainfall increases to around 3 inches. The landscape becomes green again, and the vineyards prepare for winter dormancy.
December: Cool & Wet Winter Sets In
December is a cool and wet month, similar to January and February. Average highs are around 57°F (14°C) and lows around 41°F (5°C). Rainfall averages around 5 inches. The holiday season brings festive events and a cozy atmosphere.
Santa Rosa Weather by Month: A Quick Reference Table
| Month | Avg High (°F) | Avg Low (°F) | Avg Rainfall (inches) |
|---|---|---|---|
| January | 57 | 41 | 5.5 |
| February | 60 | 43 | 4.5 |
| March | 64 | 46 | 3.5 |
| April | 69 | 49 | 2 |
| May | 74 | 53 | <1 |
| June | 79 | 57 | <1 |
| July | 84 | 60 | 0 |
| August | 83 | 60 | 0 |
| September | 80 | 58 | 0 |
| October | 74 | 53 | <1 |
| November | 64 | 46 | 3 |
| December | 57 | 41 | 5 |
Frequently Asked Questions (FAQ)
Q: What is the rainiest month in Santa Rosa?
A: January is typically the rainiest month.
Q: What is the hottest month in Santa Rosa?
A: July is generally the hottest month.
Q: Is Santa Rosa foggy?
A: Coastal fog can occasionally drift into Santa Rosa, especially during the spring and summer months, but it’s generally less frequent than in areas closer to the coast.
Q: What should I pack for a trip to Santa Rosa in the fall?
A: Layers are key! Pack a light jacket, sweaters, and comfortable walking shoes. You might also want to bring a raincoat, as November can be rainy.
Q: Is Santa Rosa humid?
A: No, Santa Rosa has a relatively dry climate, especially during the summer months.
Resources
- National Weather Service – Santa Rosa: https://www.weather.gov/ekd/
- Sonoma County Tourism: https://www.sonomacounty.com/
- Climate-Data.org – Santa Rosa: https://en.climate-data.org/location/usa/california/sonoma/santa-rosa/
- Visit Santa Rosa: https://www.visitsantarosa.com/
- Local Harvest Information: https://www.sonomaharvest.com/
