Guerneville Weather in September

Guerneville in September sees high temperatures, with highs around 27°C (81°F) and overnight lows of 10°C (50°F). With just 7.4 mm (0.3 in) of rainfall on average, rain is rarely an issue.

Rainfall in Guerneville in September

Typically around 2 days of rainfall are expected, averaging 7.4 mm (0.3 in) for the month. Rain days are few and the total is low, so this is a largely dry month. Any showers that do occur tend to be brief.

Temperature in Guerneville in September

September is a good time to be in Guerneville. Days are excellent, reaching 27°C (81°F), with nights around 10°C (50°F). Summer occurs in September. This kind of day-to-night contrast is typical for this time of year. At 10°C (50°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.

Sunshine in Guerneville in September

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

If your ideal day consists of dry skies and pleasant temperatures, April, May, June, July, August, September and October typically offer the best circumstances for Guerneville.

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Check the conditions for any month of the year.

• January
• February
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• May
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For a detailed overview over the year and the best time to visit the United States of America, check out our Guerneville's climate page.

Guerneville Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 27°C (81°F)  

Chance of Rain 7%  

Precipitation 7.4 mm (0.3 in)  

Rainy days 2 days  

Sunshine 275 hours *  

Percentage Sunshine 77% *  

* Data from: Healdsburg, the United States of America (16 KM, 10 Miles).

What to Wear in Guerneville in September

Warm but pleasant conditions in Guerneville in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Dry conditions mean you won't need to worry about rain protection. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Guerneville 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

5/10

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 Guerneville's climate page.

More climate data for Guerneville

Temperature Rainfall Sunshine

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