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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
A colorful orange sunset skyline seen over the Napa River and Bridge in Vallejo, California
Weather in January
January, like December, is another mild winter month in Vallejo, California, with an average temperature fluctuating between 56.5°F (13.6°C) and 43°F (6.1°C). With January's arrival, Vallejo notes an average high-temperature of a still refreshing 56.5°F (13.6°C), closely following the trend of the preceding month. Weather in January »
Weather in February
February, the last month of the winter in Vallejo, is also a moderate month, with temperature in the range of an average high of 59.2°F (15.1°C) and an average low of 44.1°F (6.7°C). Vallejo experiences a subtle adjustment in high-temperatures to a still mild 59.2°F (15.1°C) with the onset of February, maintaining near parity with January's 56.5°F (13.6°C). Weather in February »
Weather in March
The first month of the spring, March, is an enjoyable month in Vallejo, California, with temperature in the range of an average high of 61.5°F (16.4°C) and an average low of 45°F (7.2°C). Vallejo's shift from February to March is accompanied by an average high-temperature of an enjoyable 61.5°F (16.4°C), a slight deviation from 59.2°F (15.1°C). Weather in March »
Weather in April
April, like March, in Vallejo, California, is another enjoyable spring month, with temperature in the range of an average high of 66.7°F (19.3°C) and an average low of 46.8°F (8.2°C). Vallejo's entry into April measures an average high-temperature of a still enjoyable 66.7°F (19.3°C), closely parallel to the preceding month. Weather in April »
Weather in May
May, the last month of the spring in Vallejo, is an agreeable month, with temperature in the range of an average high of 71.1°F (21.7°C) and an average low of 49.8°F (9.9°C). As April turns into May, the average high-temperatures rest at a pleasant 71.1°F (21.7°C), showing a minor variation from the prior month. Weather in May »
Weather in June
June, the first month of the summer in Vallejo, is a moderately hot month, with an average temperature ranging between max 77.7°F (25.4°C) and min 54.1°F (12.3°C). Vallejo's June weather indicates a minor ascent in high-temperatures, adjusting from an agreeable 71.1°F (21.7°C) in May to a moderately hot 77.7°F (25.4°C). Weather in June »
Weather in July
July, like June, in Vallejo, California, is a moderately hot summer month, with an average temperature varying between 80.1°F (26.7°C) and 55.4°F (13°C). Vallejo witnesses its peak temperatures during July and September, when the average high-temperature reaches 80.1°F (26.7°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Vallejo, California, with an average temperature fluctuating between 56.5°F (13.6°C) and 79.7°F (26.5°C). The advent of August brings an average high-temperature of a still warm 79.7°F (26.5°C), almost identical to the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Vallejo, California, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 80.1°F (26.7°C). In Vallejo, the warmest period comes during July and September, when the average high-temperature touches 80.1°F (26.7°C). Weather in September »
Weather in October
October, the same as September, in Vallejo, California, is another pleasant autumn month, with temperature in the range of an average high of 72.9°F (22.7°C) and an average low of 54°F (12.2°C). October signifies a gentle decline in Vallejo's average high-temperature, easing from a moderately hot 80.1°F (26.7°C) in September to a pleasant 72.9°F (22.7°C). Weather in October »
Weather in November
November, the last month of the autumn in Vallejo, is another refreshing month, with temperature in the range of an average high of 63°F (17.2°C) and an average low of 47.7°F (8.7°C). Vallejo's November weather shows a moderate shift in high-temperatures, falling from October's agreeable 72.9°F (22.7°C) to an enjoyable 63°F (17.2°C). Weather in November »
Weather in December
The first month of the winter, December, is also a moderate month in Vallejo, California, with an average temperature ranging between min 43.2°F (6.2°C) and max 55.4°F (13°C). The coldest time of the year is December, with temperatures averaging a high of 55.4°F (13°C) and a low of 43.2°F (6.2°C). Weather in December »
Updated: Aug 9, 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 much does it rain?
Throughout the year, there are 56.9 rainfall days, and 4.88" (124mm) of precipitation is accumulated.
What is the month with the lowest UV index?
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.
What is the rainiest month?
The month with the most rainfall is February, when the rain falls for 6.8 days and typically aggregates up to 1.14" (29mm) of precipitation.
What is the most humid month?
The most humid month is March, with an average relative humidity of 75%.
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?
With an average of 14h and 48min of daylight, June has the longest days of the year.
When is the highest UV index?
June is the month with the highest UV index, with an average maximum UV index of 6.
What is the warmest month?
Warmest months are July and September, with an average high-temperature of 80.1°F (26.7°C).
What is the driest month?
July and August are months with the least rain when the rain falls for 1.5 days and typically aggregates up to 0.04" (1mm) of rain.
What month has the most sunshine?
With an average of 12h of sunshine, July has the most sunshine of the year.
What are the least humid months?
The months with the lowest humidity are September and October, with an average relative humidity of 60%.
What is the coldest time of year?
December brings the lowest temperatures, with an average high of 55.4°F (13°C) and an average low of 43.2°F (6.2°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 in Vallejo, California.
What is the month with the least sunshine?
December has the least sunshine of the year, with an average of 5.7h of sunshine.
Average temperature
Vallejo, CA
The warmest months (with the highest average high temperature) are July and September (80.1°F).
The month with the lowest average high temperature is December (55.4°F).
The month with the highest average low temperature is August (56.5°F).
The coldest month (with the lowest average low temperature) is January (43°F).
Average pressure
Vallejo, 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:
29.97"Hg - Average pressure in June:
29.91"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 month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Vallejo, CA
- Average wind speed in January:
4.9mph - Average wind speed in February:
5.7mph - Average wind speed in March:
6mph - Average wind speed in April:
6.5mph - Average wind speed in May:
7.1mph - Average wind speed in June:
6.9mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.2mph - Average wind speed in September:
5.5mph - Average wind speed in October:
5mph - Average wind speed in November:
4.6mph - Average wind speed in December:
5.2mph
The windiest month (with the highest average wind speed) is May (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).
Average humidity
Vallejo, CA
The month with the highest relative humidity is March (75%).
The months with the lowest relative humidity are September and October (60%).
Average rainfall
Vallejo, CA
- Average rainfall in January:
0.83" - Average rainfall in February:
1.14" - Average rainfall in March:
0.75" - Average rainfall in April:
0.2" - Average rainfall in May:
0.28" - Average rainfall in June:
0.08"
- Average rainfall in July:
0.04" - Average rainfall in August:
0.04" - Average rainfall in September:
0.08" - Average rainfall in October:
0.2" - Average rainfall in November:
0.47" - Average rainfall in December:
0.79"
The wettest month (with the highest rainfall) is February (1.14").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days
Vallejo, CA
- Average rainfall days in January:
7.7 days - Average rainfall days in February:
6.8 days - Average rainfall days in March:
10.2 days - Average rainfall days in April:
5.8 days - Average rainfall days in May:
3.6 days - Average rainfall days in June:
1.1 days
- Average rainfall days in July:
1.5 days - Average rainfall days in August:
0.9 days - Average rainfall days in September:
2.1 days - Average rainfall days in October:
3.4 days - Average rainfall days in November:
5.3 days - Average rainfall days in December:
8.5 days
The month with the highest number of rainy days is March (10.2 days).
The month with the least rainy days is August (0.9 days).
Average daylight / Average sunshine
Vallejo, 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 2min - Average daylight in June:
14h and 5min
- 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 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
5h and 5min - Average sunshine in February:
6h and 1min - Average sunshine in March:
7h and 4min - 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 0min - 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 4min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days
Vallejo, CA
- Average sunshine days in January:
21.8 days - Average sunshine days in February:
20.1 days - Average sunshine days in March:
18.8 days - Average sunshine days in April:
22.8 days - Average sunshine days in May:
24.3 days - Average sunshine days in June:
26.7 days
- Average sunshine days in July:
27.2 days - Average sunshine days in August:
25.8 days - Average sunshine days in September:
26 days - Average sunshine days in October:
25.5 days - Average sunshine days in November:
23.6 days - Average sunshine days in December:
20.8 days
The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is March (18.8 days).
Average UV index
Vallejo, CA
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover
Vallejo, CA
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility
Vallejo, 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).
Vallejo, California, USA
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