July weather forecast
Saint Helena, CA

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Weather in July

July in Saint Helena, California, is a tropical summer month, with temperature in the range of an average low of 53.8°F (12.1°C) and an average high of 88.3°F (31.3°C).

Temperature

July is the month when Saint Helena sees the highest average temperatures, with a high of 88.3°F (31.3°C) and a low of 53.8°F (12.1°C).

Heat index

The heat index value during July is calculated to be a tropical 93.2°F (34°C). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.
Consider that heat index readings are for situations in the shade and light wind. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is the outcome of merging air's temperature and its humidity metrics. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.

Humidity

In July, the average relative humidity is 55%.

Rainfall

July is the only month when rain does not fall.

Snowfall

In Saint Helena, California, snow does not fall in January, February, April through December.

Daylight

In July, the average length of the day is 14h and 32min.
On the first day of the month, sunrise is at 5:49 am and sunset at 8:37 pm. On the last day of July, sunrise is at 6:11 am and sunset at 8:20 pm PDT.

Sunshine

The month with the most sunshine in Saint Helena is July, with an average of 11.9h of sunshine.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In July, the maximum UV index of 6 translates into these guidelines:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
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Frequently asked questions

What are the warmest months in Saint Helena?

In Saint Helena, California, the peak average temperatures are observed in July, with a high of 88.3°F (31.3°C) and a low of 53.8°F (12.1°C).

How hot does it get in Saint Helena in July?

The high-temperature during July is 88.3°F (31.3°C) and the low-temperature is 53.8°F (12.1°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in July is calculated to be 93.2°F (34°C).

What is the average humidity in July in Saint Helena?

In July, the average relative humidity in Saint Helena, California, is 55%.

What is the driest month in Saint Helena?

The only month without rainfall in Saint Helena is July.

Does it rain in Saint Helena in July?

In July, in Saint Helena, it doesn't rain. June is the latest month when it rains.

When it does not snow in Saint Helena?

January, February, April through December are months without snowfall in Saint Helena.

What is the average length of the day in July in Saint Helena?

In July, the average day length in Saint Helena, California, is 14h and 32min.

What time are sunrise and sunset in July in Saint Helena?

In July, on the first day of the month, sunrise is at 5:49 am and sunset at 8:37 pm. On the last day of the month, in Saint Helena, sunrise is at 6:11 am and sunset at 8:20 pm PDT.

What month has the most sunshine in Saint Helena?

July has the most sunshine of the year in Saint Helena, California, with an average of 11.9h of sunshine.

How many hours of sunshine does Saint Helena have in July?

In Saint Helena, California, the average sunshine duration in July is 11.9h.

When is the highest UV index in Saint Helena?

June through August, with an average maximum UV index of 6, are months with the highest UV index.

What is the UV index reading in July in Saint Helena?

In Saint Helena, the average daily maximum UV index in July is 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
Saint Helena, CA

Average temperature in July - Saint Helena, CA
  • Average high temperature in July: 88.3°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 July: 53.8°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).

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Average pressure in July
Saint Helena, CA

Average pressure in July - Saint Helena, CA
  • Average pressure in July: 29.92"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).

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Average wind speed in July
Saint Helena, CA

Average wind speed in July - Saint Helena, CA
  • Average wind speed in July: 5.2mph

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).

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Average humidity in July
Saint Helena, CA

Average humidity in July - Saint Helena, CA
  • Average humidity in July: 55%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (53%).

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Average rainfall in July
Saint Helena, CA

Average rainfall in July - Saint Helena, CA
  • Average rainfall in July: 0"

The wettest month (with the highest rainfall) is February (3.7").
The driest month (with the least rainfall) is July (0").

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Average rainfall days in July
Saint Helena, CA

Average rainfall days in July - Saint Helena, CA
  • Average rainfall days in July: 0.8 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).

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Average snowfall in July
Saint Helena, CA

Average snowfall in July - Saint Helena, CA
  • Average snowfall in July: 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").

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Average snowfall days in July
Saint Helena, CA

Average snowfall days in July - Saint Helena, CA
  • Average snowfall days in July: 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).

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Average daylight in July /
Average sunshine in July
Saint Helena, CA

Average daylight in July / Average sunshine in July - Saint Helena, CA
  • Average daylight in July: 14h and 3min

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 July: 11h and 5min

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).

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Average sunshine days in July
Saint Helena, CA

Average sunshine days in July - Saint Helena, CA
  • Average sunshine days in July: 30 days

The month with the most sunshine days is July (30 days).
The month with the least sunshine days is March (15.9 days).

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Average UV index in July
Saint Helena, CA

Average UV index in July - Saint Helena, CA
  • Average UV index in July: 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).

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Average cloud cover in July
Saint Helena, CA

Average cloud cover in July - Saint Helena, CA
  • Average cloud cover in July: 7

The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 7).

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Average visibility in July
Saint Helena, CA

Average visibility in July - Saint Helena, CA
  • Average visibility in July: 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).

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Saint Helena, California, USA

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