July weather forecastAltadena, CA
July
Weather in July
July, like June, in Altadena, California, is another warm summer month, with an average temperature ranging between min 63.3°F (17.4°C) and max 85.1°F (29.5°C).Temperature
Altadena records an average high-temperature of a still warm 85.1°F (29.5°C) in July, maintaining a close correlation with June's 79.9°F (26.6°C). From significant daily highs, Altadena's nights in July cool down to an average low-temperature of 63.3°F (17.4°C).Heat index
The heat index value for July is evaluated at a tropical 86°F (30°C). Long-lasting exposure and activity potentially induce a sense of weariness, with the risk of heat cramps.Know that the heat index computations account for shaded terrains and slight winds. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
Humidity
In Altadena, the average relative humidity in July is 51%.Rainfall
In July, in Altadena, the rain falls for 3.9 days. Throughout July, 0.28" (7mm) of precipitation is accumulated. In Altadena, during the entire year, the rain falls for 52 days and collects up to 8.82" (224mm) of precipitation.Daylight
In Altadena, the average length of the day in July is 14h and 10min.On the first day of July, sunrise is at 5:44 am and sunset at 8:08 pm. On the last day of the month, sunrise is at 6:03 am and sunset at 7:54 pm PDT.
Sunshine
The months with the most sunshine are June and July, with an average of 12.1h of sunshine.UV index
The months with the highest UV index are June through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high daily UV index of 6 during July translates into the following directions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full 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 July
Altadena, CA
- Average high temperature in July: 85.1°F
The warmest month (with the highest average high temperature) is August (86.2°F).
The month with the lowest average high temperature is December (61°F).
- Average low temperature in July: 63.3°F
The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).
Average pressure in July
Altadena, CA
- Average pressure in July: 29.91"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in July
Altadena, CA
- Average wind speed in July: 4.9mph
The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in July
Altadena, CA
- Average humidity in July: 51%
The months with the highest relative humidity are March, May and June (56%).
The month with the lowest relative humidity is November (46%).
Average rainfall in July
Altadena, CA
- Average rainfall in July: 0.28"
The wettest month (with the highest rainfall) is February (1.81").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in July
Altadena, CA
- Average rainfall days in July: 3.9 days
The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.3 days).
Average daylight in July /
Average sunshine in July
Altadena, CA
- Average daylight in July: 14h and 12min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in July: 12h and 6min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).
Average sunshine days in July
Altadena, CA
- Average sunshine days in July: 24.3 days
The month with the most sunshine days is June (27.2 days).
The month with the least sunshine days is February (21.3 days).
Average UV index in July
Altadena, CA
- Average UV index in July: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in July
Altadena, CA
- Average cloud cover in July: 6
The month with the most cloud cover is March (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in July
Altadena, CA
- Average visibility in July: 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).
