June weather forecastSaint Helena, CA
June
Weather in June
The first month of the summer, June, is still a warm month in Saint Helena, California, with an average temperature ranging between max 83.8°F (28.8°C) and min 52.5°F (11.4°C).Temperature
June signals a shift in the average high-temperature, moving from May's 74.1°F (23.4°C) to a still warm 83.8°F (28.8°C). Significant dips from daytime highs mark the June nights, with a consistent average temperature of 52.5°F (11.4°C).Heat index
For most parts of June, the heat index is appraised at a hot 86°F (30°C). Exhaustion becomes probable with enduring exposure and activity, potentially causing heat cramps.Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', blends air temperature and moisture content to represent the felt temperature to humans. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.
Humidity
In Saint Helena, the average relative humidity in June is 56%.Rainfall
June is the last month it rains. During 2 rainfall days, in June, Saint Helena aggregates 0.12" (3mm) of precipitation. Throughout the year, in Saint Helena, there are 76.2 rainfall days, and 16.93" (430mm) of precipitation is accumulated.Snowfall
January, February, April through December are months without snowfall.Daylight
June has the longest days of the year, with an average of 14h and 48min of daylight.On the first day of the month, sunrise is at 5:47 am and sunset at 8:28 pm. On the last day of June, in Saint Helena, sunrise is at 5:49 am and sunset at 8:38 pm PDT.
Sunshine
In Saint Helena, the average sunshine in June is 11.5h.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In June, the maximum UV index of 6 transforms into these recommendations:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in June
Saint Helena, CA
- Average high temperature in June: 83.8°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 June: 52.5°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 June
Saint Helena, CA
- Average pressure in June: 29.91"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 June
Saint Helena, CA
- Average wind speed in June: 5.6mph
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 June
Saint Helena, CA
- Average humidity in June: 56%
The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (53%).
Average rainfall in June
Saint Helena, CA
- Average rainfall in June: 0.12"
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 June
Saint Helena, CA
- Average rainfall days in June: 2 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 June
Saint Helena, CA
- Average snowfall in June: 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 June
Saint Helena, CA
- Average snowfall days in June: 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 June /
Average sunshine in June
Saint Helena, CA
- Average daylight in June: 14h and 48min
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 June: 11h 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 June
Saint Helena, CA
- Average sunshine days in June: 27.3 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 June
Saint Helena, CA
- Average UV index in June: 6
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 June
Saint Helena, CA
- Average cloud cover in June: 14
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 June
Saint Helena, CA
- Average visibility in June: 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).
