May weather forecastGuerneville, CA
May
Weather in May
May, the last month of the spring in Guerneville, is an agreeable month, with temperature in the range of an average low of 47.5°F (8.6°C) and an average high of 69.6°F (20.9°C).Temperature
Welcoming May, Guerneville notes an average high-temperature of an agreeable 69.6°F (20.9°C), nearly consistent with April's 65.7°F (18.7°C). Contrasting the daytime warmth, Guerneville's May nights cool down to an average of 47.5°F (8.6°C).Humidity
The average relative humidity in May in Guerneville is 70%.Rainfall
In Guerneville, during May, the rain falls for 4.8 days and regularly aggregates up to 0.79" (20mm) of precipitation. Throughout the year, there are 60.1 rainfall days, and 12.87" (327mm) of precipitation is accumulated.Daylight
In May, the average length of the day is 14h and 17min.On the first day of the month, sunrise is at 6:13 am and sunset at 8:04 pm. On the last day of May, in Guerneville, California, sunrise is at 5:49 am and sunset at 8:30 pm PDT.
Sunshine
In Guerneville, California, the average sunshine in May is 10.2h.UV index
The average daily maximum UV index in May in Guerneville is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: In May, a daily maximum UV index of 4 leads to the following instructions:
Act with care - Obligation to protect against skin and eye damage is highlighted. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Guerneville, CA
- Average high temperature in May: 69.6°F
The warmest month (with the highest average high temperature) is August (81°F).
The month with the lowest average high temperature is December (56.3°F).
- Average low temperature in May: 47.5°F
The months with the highest average low temperature are August and September (53.4°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).
Average pressure in May
Guerneville, CA
- Average pressure in May: 29.98"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in May
Guerneville, CA
- Average wind speed in May: 7.2mph
The windiest month (with the highest average wind speed) is May (7.2mph).
The calmest month (with the lowest average wind speed) is November (5mph).
Average humidity in May
Guerneville, CA
- Average humidity in May: 70%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (62%).
Average rainfall in May
Guerneville, CA
- Average rainfall in May: 0.79"
The wettest month (with the highest rainfall) is February (3.27").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in May
Guerneville, CA
- Average rainfall days in May: 4.8 days
The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is August (0.9 days).
Average daylight in May /
Average sunshine in May
Guerneville, CA
- Average daylight in May: 14h and 18min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in May: 10h and 12min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in May
Guerneville, CA
- Average sunshine days in May: 24.8 days
The month with the most sunshine days is July (28.9 days).
The month with the least sunshine days is February (19.9 days).
Average UV index in May
Guerneville, CA
- Average UV index in May: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in May
Guerneville, CA
- Average cloud cover in May: 29
The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in May
Guerneville, CA
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
