April weather forecastSaint Helena, CA
April
Weather in April
April in Saint Helena, California, is a pleasant spring month, with an average temperature fluctuating between 68°F (20°C) and 43.2°F (6.2°C).Temperature
April's onset brings a subtle temperature rise, moving from an enjoyable 61.5°F (16.4°C) in March to a pleasant 68°F (20°C). Saint Helena logs a substantial downturn to a chilly 43.2°F (6.2°C) during April nights, a considerable shift from daytime highs.Humidity
In Saint Helena, the average relative humidity in April is 69%.Rainfall
In Saint Helena, in April, during 9 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. Throughout the year, there are 76.2 rainfall days, and 16.93" (430mm) of precipitation is accumulated.Snowfall
In Saint Helena, snow does not fall in January, February, April through December.Daylight
The average length of the day in April is 13h and 14min.On the first day of April, sunrise is at 6:53 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:12 am and sunset at 8:01 pm PDT.
Sunshine
In April, the average sunshine is 9.5h.UV index
In April, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: The daily maximum UV index of 5 in April interprets into the following advice:
Take precautions - Protection against skin and eye damage is obliged. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Saint Helena, CA
- Average high temperature in April: 68°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (54.5°F).
- Average low temperature in April: 43.2°F
The month with the highest average low temperature is September (54.3°F).
The coldest month (with the lowest average low temperature) is December (39.6°F).
Average pressure in April
Saint Helena, CA
- Average pressure in April: 30.03"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).
Average wind speed in April
Saint Helena, CA
- Average wind speed in April: 5.7mph
The windiest month (with the highest average wind speed) is May (5.8mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).
Average humidity in April
Saint Helena, CA
- Average humidity in April: 69%
The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (53%).
Average rainfall in April
Saint Helena, CA
- Average rainfall in April: 0.87"
The wettest month (with the highest rainfall) is February (3.7").
The driest month (with the least rainfall) is July (0").
Average rainfall days in April
Saint Helena, CA
- Average rainfall days in April: 9 days
The month with the highest number of rainy days is March (13.5 days).
The month with the least rainy days is August (0.3 days).
Average snowfall in April
Saint Helena, CA
- Average snowfall in April: 0"
The month with the highest snowfall is March (0.04").
The months with the least snowfall are January, February, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in April
Saint Helena, CA
- Average snowfall days in April: 0 days
The month with the highest number of snowfall days is March (0.2 days).
The months with the least snowfall days are January, February, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in April /
Average sunshine in April
Saint Helena, CA
- Average daylight in April: 13h and 12min
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 April: 9h and 30min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in April
Saint Helena, CA
- Average sunshine days in April: 20.2 days
The month with the most sunshine days is July (30 days).
The month with the least sunshine days is March (15.9 days).
Average UV index in April
Saint Helena, CA
- Average UV index in April: 5
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 April
Saint Helena, CA
- Average cloud cover in April: 34
The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in April
Saint Helena, CA
- Average visibility in April: 6mi
The months with the highest visibility are February, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and March (5mi).
