Live Weather & Forecast

Weather in Guerneville

California, United States · Real-time conditions & 3-day outlook

Flag of United States
Clear
6°C
Feels like 6°C
43°F / Feels 42°F
Clear
Guerneville, California
🌙 Nighttime
Updated: 2026-04-18 06:15
💧
Humidity
93%
💨
Wind
4.7 km/h N
🌬️
Wind Gust
9.8 km/h
🌡️
Pressure
1016 mb
👁️
Visibility
16 km
☀️
UV Index
0 (Low)
🌧️
Precipitation
0 mm
☁️
Cloud Cover
0%
💦
Dew Point
-1.4°C
🌐
Wind Degree
10°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
166.9 μg/m³
NO₂
3.5 μg/m³
O₃
100 μg/m³
SO₂
3.6 μg/m³
PM 2.5
8.4 μg/m³
PM 10
10.8 μg/m³

Weather Alerts 2

Met · Minor · Expected
Frost Advisory issued April 17 at 7:10PM PDT until April 18 at 8:00AM PDT by NWS Eureka CA

* WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Northern Lake, Western Lake, Northwestern Interior Mendocino, and Southeastern Interior Humboldt. * WHEN...From 1 AM to 8 AM PDT Saturday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.

Effective: 2026-04-17T19:10:00-07:00  ·  Expires: 2026-04-18T03:15:00-07:00
Met · Minor · Expected
Frost Advisory issued April 18 at 1:22AM PDT until April 18 at 8:00AM PDT by NWS Eureka CA

* WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Northern Lake, Western Lake, Northwestern Interior Mendocino, and Southeastern Interior Humboldt. * WHEN...Until 8 AM PDT this morning. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.

Effective: 2026-04-18T01:22:00-07:00  ·  Expires: 2026-04-18T08:00:00-07:00

Today's Hourly Forecast

24-hour breakdown for Guerneville, California

12 AM
Clear
11°
Clear
💧 53% 💨 4 km/h
1 AM
Clear
10°
Clear
💧 52% 💨 5 km/h
2 AM
Clear
10°
Clear
💧 53% 💨 5 km/h
3 AM
Clear
10°
Clear
💧 50% 💨 4.7 km/h
4 AM
Clear
10°
Clear
💧 47% 💨 4.7 km/h
5 AM
Clear
9°
Clear
💧 46% 💨 5 km/h
6 AM
Clear
6°
Clear
💧 93% 💨 4.7 km/h
7 AM
Sunny
10°
Sunny
💧 51% 💨 4.3 km/h
8 AM
Sunny
13°
Sunny
💧 55% 💨 3.2 km/h
9 AM
Sunny
15°
Sunny
💧 54% 💨 2.9 km/h
10 AM
Sunny
18°
Sunny
💧 49% 💨 2.2 km/h
11 AM
Sunny
21°
Sunny
💧 41% 💨 4 km/h
12 PM
Sunny
23°
Sunny
💧 34% 💨 5 km/h
1 PM
Sunny
24°
Sunny
💧 32% 💨 6.1 km/h
2 PM
Sunny
24°
Sunny
💧 42% 💨 7.9 km/h
3 PM
Sunny
22°
Sunny
💧 36% 💨 8.6 km/h
4 PM
Sunny
20°
Sunny
💧 45% 💨 7.2 km/h
5 PM
Overcast
19°
Overcast
💧 46% 💨 6.1 km/h
6 PM
Overcast
17°
Overcast
💧 52% 💨 5 km/h
7 PM
Overcast
14°
Overcast
💧 64% 💨 4 km/h
8 PM
Clear
13°
Clear
💧 65% 💨 3.2 km/h
9 PM
Partly Cloudy
12°
Partly Cloudy
💧 65% 💨 2.5 km/h
10 PM
Partly Cloudy
11°
Partly Cloudy
💧 65% 💨 1.1 km/h
11 PM
Partly Cloudy
10°
Partly Cloudy
💧 68% 💨 1.4 km/h

3-Day Forecast

Daily overview for Guerneville, California

Today
Sunny
Sunny
25° / 9°
🌧️ 0% chance of rain
💧 Avg. humidity: 51%
💨 Max wind: 8.6 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.7
🌅 Sunrise: 06:31 AM
🌇 Sunset: 07:52 PM
🌙 Waxing Crescent
🌑 Moon: 1% lit
Sun, Apr 19
Cloudy
Cloudy
18° / 7°
🌧️ 0% chance of rain
💧 Avg. humidity: 60%
💨 Max wind: 12.2 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.6
🌅 Sunrise: 06:30 AM
🌇 Sunset: 07:53 PM
🌙 Waxing Crescent
🌑 Moon: 3% lit
Mon, Apr 20
Moderate rain
Moderate rain
13° / 7°
🌧️ 83% chance of rain
💧 Avg. humidity: 85%
💨 Max wind: 7.9 km/h
🌧️ Total precip: 14.63 mm
☀️ UV Index: 0.4
🌅 Sunrise: 06:28 AM
🌇 Sunset: 07:54 PM
🌙 Waxing Crescent
🌑 Moon: 9% lit

Best Time to Visit Guerneville

Plan your trip to Guerneville, United States around the most favorable weather conditions.

Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
← Back to Guerneville 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Guerneville?
Current conditions in Guerneville: Clear, temperature 6°C, humidity 93%.
What is the best time to visit Guerneville?
The best time to visit Guerneville is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Guerneville?
Guerneville is located at approximately 38.5° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Guerneville?
The wettest period in Guerneville is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Guerneville?
For visits to Guerneville during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Guerneville in?
Guerneville is located in United States, in the state of California.
What are the public holidays in Guerneville in 2026?
View the 2026 public holidays for Guerneville on our Holidays page.
What are the GPS coordinates used for the weather forecast in Guerneville?
The weather forecast for Guerneville uses coordinates 38.502, -122.9987.