July weather forecast
Saint Helena, CA

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Weather in July

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

Temperature

The warmest temperatures occur during July, when averages reach a peak of 88.3°F (31.3°C) and a low of 53.8°F (12.1°C).

Heat index

For most parts of July, the heat index is appraised at a hot 93.2°F (34°C). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.
Know that the heat index computations account for shaded terrains and slight winds. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', comes about by integrating the temperature readings with the humidity levels. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are especially vital to children. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.

Humidity

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

Rainfall

July is the only month when rain does not fall.

Snowfall

January, February, April through December are months without snowfall.

Daylight

In Saint Helena, the average length of the day in July 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

With an average of 11.9h of sunshine, July has the most sunshine of the year.

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 vulnerability from unsafe exposure to UV radiation for the average person.
Note: In July, the maximum UV index of 6 transforms into these recommendations:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Opt for tightly woven and loose clothing to enhance protection from the Sun.

Frequently asked questions

What is the hottest time of year in Saint Helena?

With average high and low temperatures of 88.3°F (31.3°C) and 53.8°F (12.1°C) respectively, July is Saint Helena's warmest month.

Is it hot in Saint Helena during July?

In July, the average high-temperature and low-temperature are 88.3°F (31.3°C) and 53.8°F (12.1°C) respectively. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in July is appraised at 93.2°F (34°C).

What is the average humidity in July?

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

What is the driest month?

The only month without rainfall is July.

Does it rain in July?

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

When it does not snow?

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

What is the average length of the day in July?

The average day length in July is 14h and 32min.

When are sunrise and sunset in July?

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

What month has the most sunshine?

July has the most sunshine of the year, with an average of 11.9h of sunshine.

How long on average sun shines in July?

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

What are the months with the highest UV index?

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

How high is the UV index in July?

In Saint Helena, the average daily maximum UV index in July is 6. A UV Index reading of 6 to 7 represents a high health vulnerability 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).

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).

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).

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%).

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").

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).

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").

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).

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).

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).

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).

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).

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).

Saint Helena, California, USA

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