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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Climate and monthly weather forecast
Weather in January
January, the same as December, in Diablo, California, is another refreshing winter month, with temperature in the range of an average high of 56.8°F (13.8°C) and an average low of 42.1°F (5.6°C). The transition from December to January sees average high-temperatures adjusting to a still moderate 56.8°F (13.8°C), from a not significantly different 55.8°F (13.2°C). Weather in January »
Weather in February
February, the last month of the winter in Diablo, is also a moderate month, with an average temperature varying between 42.6°F (5.9°C) and 59.7°F (15.4°C). Diablo sees the arrival of February with an average high-temperature of a still refreshing 59.7°F (15.4°C), indicating a subtle variation from January. Weather in February »
Weather in March
The first month of the spring, March, is an enjoyable month in Diablo, California, with an average temperature fluctuating between 43.5°F (6.4°C) and 63°F (17.2°C). Upon the beginning of March, Diablo's high-temperatures register at a comfortable 63°F (17.2°C), closely mirroring the preceding month. Weather in March »
Weather in April
April in Diablo, California, is an agreeable spring month, with an average temperature fluctuating between 45.7°F (7.6°C) and 68°F (20°C). The average high-temperature is an agreeable 68°F (20°C) in April, hardly different from the 63°F (17.2°C) recorded in March. Weather in April »
Weather in May
May, the last month of the spring in Diablo, is also an agreeable month, with an average temperature ranging between min 48.7°F (9.3°C) and max 72.7°F (22.6°C). The shift into May finds Diablo at an average high-temperature of a still agreeable 72.7°F (22.6°C), closely comparable to April's conditions. Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Diablo, California, with an average temperature ranging between max 80.2°F (26.8°C) and min 53.8°F (12.1°C). The start of June brings a subtle shift in the average high-temperature, edging up from May's agreeable 72.7°F (22.6°C) to a warm 80.2°F (26.8°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Diablo, California, with an average temperature varying between 83.8°F (28.8°C) and 55.2°F (12.9°C). In Diablo, California, July is identified by the highest average temperatures, reaching a peak of 83.8°F (28.8°C) and a low of 55.2°F (12.9°C). The average heat index in July is evaluated at a tropical 86°F (30°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Diablo, California, with an average temperature ranging between max 82.9°F (28.3°C) and min 56.7°F (13.7°C). During August, Diablo observes a subtle ascent to a still moderately hot 82.9°F (28.3°C) from July's 83.8°F (28.8°C) in the average high-temperature. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Diablo, California, with an average temperature ranging between min 56.7°F (13.7°C) and max 82°F (27.8°C). During September, the average high-temperature is a still warm 82°F (27.8°C), maintaining a close resemblance to that of the preceding month. Weather in September »
Weather in October
October, the same as September, is another warm autumn month in Diablo, California, with temperature in the range of an average high of 74.3°F (23.5°C) and an average low of 53.8°F (12.1°C). A mild shift in the average high-temperature occurs in October, reducing from 82°F (27.8°C) in September to a still moderately hot 74.3°F (23.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is another comfortable month in Diablo, California, with an average temperature fluctuating between 64°F (17.8°C) and 46.9°F (8.3°C). The average high-temperature drops in November, from October's warm 74.3°F (23.5°C) to a comfortable 64°F (17.8°C). Weather in November »
Weather in December
The first month of the winter, December, is still a refreshing month in Diablo, California, with an average temperature ranging between min 42.3°F (5.7°C) and max 55.8°F (13.2°C). December is the coldest month of the year, registering average temperatures as high as 55.8°F (13.2°C) and as low as 42.3°F (5.7°C). Weather in December »
Updated: Jul 8, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How many days does it rain?
In Diablo, during the entire year, the rain falls for 65.6 days and collects up to 11.22" (285mm) of precipitation.
When is the lowest UV index in Diablo?
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Diablo.
What is the rainiest month?
The month with the most rainfall is February, when the rain falls for 8 days and typically aggregates up to 2.36" (60mm) of precipitation.
What is the most humid month?
With an average relative humidity of 74%, March is the most humid month.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
When are the longest days?
The month with the longest days in Diablo is June, with an average of 14h and 42min of daylight.
What is the month with the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What month is the hottest?
With average high and low temperatures of 83.8°F (28.8°C) and 55.2°F (12.9°C) respectively, July is Diablo's warmest month.
What is the driest month?
July and August are months without rainfall.
What month has the most sunshine?
The month with the most sunshine is July, with an average of 12.1h of sunshine.
What is the least humid month?
With an average relative humidity of 57%, September is the least humid month.
When does it rain?
January through June, September through December are months with rainfall.
What is the coldest time of year?
Diablo's coldest weather arrives in December, when temperatures average a high of 55.8°F (13.2°C) and a low of 42.3°F (5.7°C).
What is the month with the shortest days?
With an average of 9h and 36min of daylight, December has the shortest days of the year.
What is the month with the least sunshine?
December has the least sunshine of the year, with an average of 5.8h of sunshine.
Average temperature
Diablo, CA
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (55.8°F).
The months with the highest average low temperature are August and September (56.7°F).
The coldest month (with the lowest average low temperature) is January (42.1°F).
Average pressure
Diablo, CA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
30.03"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"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 (29.92"Hg).
Average wind speed
Diablo, CA
- Average wind speed in January:
4.5mph - Average wind speed in February:
5.3mph - Average wind speed in March:
5.7mph - Average wind speed in April:
6.2mph - Average wind speed in May:
6.9mph - Average wind speed in June:
6.7mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6mph - Average wind speed in September:
5.4mph - Average wind speed in October:
4.7mph - Average wind speed in November:
4.3mph - Average wind speed in December:
4.8mph
The windiest month (with the highest average wind speed) is May (6.9mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).
Average humidity
Diablo, CA
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (57%).
Average rainfall
Diablo, CA
- Average rainfall in January:
1.97" - Average rainfall in February:
2.36" - Average rainfall in March:
1.89" - Average rainfall in April:
0.67" - Average rainfall in May:
0.55" - Average rainfall in June:
0.08"
The wettest month (with the highest rainfall) is February (2.36").
The driest months (with the least rainfall) are July and August (0").
Average rainfall days
Diablo, CA
- Average rainfall days in January:
8.8 days - Average rainfall days in February:
8 days - Average rainfall days in March:
12.6 days - Average rainfall days in April:
7.1 days - Average rainfall days in May:
4.3 days - Average rainfall days in June:
1.3 days
- Average rainfall days in July:
0.8 days - Average rainfall days in August:
0.6 days - Average rainfall days in September:
1.7 days - Average rainfall days in October:
4.1 days - Average rainfall days in November:
6.5 days - Average rainfall days in December:
9.8 days
The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (0.6 days).
Average daylight / Average sunshine
Diablo, CA
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 4min
- Average daylight in July:
14h and 3min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
6h and 1min - Average sunshine in February:
6h and 1min - Average sunshine in March:
7h and 5min - Average sunshine in April:
10h and 2min - Average sunshine in May:
10h and 5min - Average sunshine in June:
11h and 4min
- Average sunshine in July:
12h and 1min - Average sunshine in August:
11h and 5min - Average sunshine in September:
11h and 1min - Average sunshine in October:
7h and 0min - Average sunshine in November:
6h and 3min - Average sunshine in December:
5h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days
Diablo, CA
- Average sunshine days in January:
21 days - Average sunshine days in February:
19.2 days - Average sunshine days in March:
17.6 days - Average sunshine days in April:
21.8 days - Average sunshine days in May:
26 days - Average sunshine days in June:
28.1 days
- Average sunshine days in July:
30.2 days - Average sunshine days in August:
29.9 days - Average sunshine days in September:
27.2 days - Average sunshine days in October:
25.9 days - Average sunshine days in November:
22.4 days - Average sunshine days in December:
20.6 days
The month with the most sunshine days is July (30.2 days).
The month with the least sunshine days is March (17.6 days).
Average UV index
Diablo, CA
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
Diablo, CA
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility
Diablo, CA
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).