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Contents
- The climate of Pasadena
- The best time to visit Pasadena
- The worst time to visit Pasadena
- Spring weather in Pasadena
- Summer weather in Pasadena
- Autumn weather in Pasadena
- Winter weather in Pasadena
- 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
Pasadena City Hall in California, with neon-lit paths and natural gardens, under a perfect blue night sky
The climate of Pasadena
Pasadena, California, is comfortably nestled within the Köppen climate classification Csb zone, denoted for regions typified by a Mediterranean climate with warm summers. Throughout the year, Pasadena enjoys a climate marked by moderate temperatures and plenty of sunshine.
Seasonal temperatures offer a pattern, with the lowest average temperatures recorded during the coldest months go from 46.8°F (8.2°C) in December to 47.3°F (8.5°C) in January, while July and August see the warmest months with the temperature reaching 87.1°F (30.6°C) to 85.5°F (29.7°C). Relative humidity fluctuates slightly around the year, with January experiencing the highest average at 56% and November recording the lowest at 47%.
Yearly rainfall follows a charted path with the least rainfall occurring during the summer months, specifically a drop to 0.04" (1mm) in June and slightly increasing to 0.24" (6mm) in July. Conversely, rainfall manifests its zenith in February at 1.77" (45mm), and in December, where precipitation peaks again at 1.65" (42mm).
Unique perspectives in Pasadena's climate feature daytime sunlight hours ranging from a low of 9.9 hours in December gradually increasing to a high of 14.4 hours in June, then tapering off anew. Contrastingly, cloud coverage maximizes to 21% in December and March, then diminishes to a mere 5% from July through September.
Seasonal temperatures offer a pattern, with the lowest average temperatures recorded during the coldest months go from 46.8°F (8.2°C) in December to 47.3°F (8.5°C) in January, while July and August see the warmest months with the temperature reaching 87.1°F (30.6°C) to 85.5°F (29.7°C). Relative humidity fluctuates slightly around the year, with January experiencing the highest average at 56% and November recording the lowest at 47%.
Yearly rainfall follows a charted path with the least rainfall occurring during the summer months, specifically a drop to 0.04" (1mm) in June and slightly increasing to 0.24" (6mm) in July. Conversely, rainfall manifests its zenith in February at 1.77" (45mm), and in December, where precipitation peaks again at 1.65" (42mm).
Unique perspectives in Pasadena's climate feature daytime sunlight hours ranging from a low of 9.9 hours in December gradually increasing to a high of 14.4 hours in June, then tapering off anew. Contrastingly, cloud coverage maximizes to 21% in December and March, then diminishes to a mere 5% from July through September.
The best time to visit Pasadena
As with any travel plans, the "best" time truly depends on what one seeks. However, by analyzing average weather conditions, one might be compelled to appoint July and August as ideal months for visiting Pasadena. During this time, days are long, providing up to an impressive 14.2 hours of daylight in July. The relative humidity dips to its lowest, temperatures reach their highest, and sunshine prevails for an estimated 12.1 hours daily. Moreover, rainfall is at its bare minimum, making outdoor activities considerably more pleasurable.
The worst time to visit Pasadena
Contrarily, December and January might not be the optimum months for leisure tourism in Pasadena. While the weather remains mild, these months record the shortest daylight hours - under 10 hours. The proliferation of clouds during this time also means less sunshine, roughly 6.9 hours per day, coupled with the year's lowest temperatures and increased rainfall.
Spring weather in Pasadena
Spring in Pasadena, spanning from March to May, presents agreeable temperatures that escalate from 66.9°F (19.4°C) to 73.9°F (23.3°C). Rainfall generally subsides, reducing from 1.14" (29mm) in March to a trifling 0.2" (5mm) by May. Daylight hours extend from 12 in March to 14 by May, while sunshine graces the city for anywhere between 8.9 hours and 11.8 hours daily.
Summer weather in Pasadena
Summer extends from June through August in Pasadena. The season comes alive with high temperatures spanning from 80.2°F (26.8°C) in June to a peak of 87.1°F (30.6°C) in August. Rain is scant during this period, just about 0.04" (1mm) in June, which slightly increases to 0.24" (6mm) in August. Long sunny days are a norm, with daylight hours varying from 14.4 hours in June to 13.4 hours in August.
Autumn weather in Pasadena
Autumn in Pasadena introduces a noticeable cooldown with temperatures seeing a gradual descent from 84.4°F (29.1°C) in September to a more subdued 69.6°F (20.9°C) by November. Rainfall follows a mirror pattern, building from a light 0.16" (4mm) in September to a significant 0.79" (20mm) in November. Sunshine hours also subside during this season, registering 10.8 hours per day in September and diminishing to approximately 7.3 hours by November.
Winter weather in Pasadena
Winter in Pasadena, beginning in December and culminating in February, is mild by most measures, with average temperatures falling between 61.7°F (16.5°C) to 63.3°F (17.4°C). Rainfall gains momentum during these months, peaking at 1.77" (45mm) in February before reducing again. Daily sunshine hours moderate to around 6.9 hours, while daylight lasts for about 10 hours.
Weather in January
January in Pasadena, California kicks off with cool temperatures, the lower end falling to 47.3°F (8.5°C) and the higher spectrum reaching 63.9°F (17.7°C) on average. Due to its position in the winter period, January leans towards the cooler side, offering relatively comfortable weather compared to the biting cold experienced in other parts of the nation. Weather in January »
Weather in February
As January transitions into February, Pasadena records a slight drop in high temperatures, from 63.9°F (17.7°C) to 63.3°F (17.4°C), while the cooler side stays stable at 46.6°F (8.1°C). Charleston’s weather conditions in February remain much the same as January, without any notable changes in wind speed, rainfall, or sunshine hours. Weather in February »
Weather in March
The commencement of spring in March brings a slight increment in temperatures, with highs now reaching 66.9°F (19.4°C) and lows at 48.2°F (9°C), an uplift from the previous months. March's increased temperature offers a pleasant climate, building an inviting ambiance for tourists. Weather in March »
Weather in April
Pasadena's April weather shows a further increment in the temperature range from March, reaching up to 71.2°F (21.8°C) at its high. Changes on the meteorological front in April are evident with a clear rise in temperatures, indicating the departure from the early spring season. Weather in April »
Weather in May
May in Pasadena welcomes warmer weather, with the highest temperature going up to 73.9°F (23.3°C), a respective increase from April's 71.2°F (21.8°C). The month of May signifies that summer is near, with temperatures consistently rising and rainfall dropping considerably. Weather in May »
Weather in June
June signals the onset of summer in Pasadena with temperatures soaring up to 80.2°F (26.8°C). As temperatures rise, rains decrease, leading to sunny skies and longer daylight in June. The city lives up to its reputation as a popular summer destination, with the warm weather complementing the cheerful atmosphere. Weather in June »
Weather in July
July experiences the highest temperatures of the year in Pasadena with a peak reading up to 85.5°F (29.7°C). Signifying midsummer, July comes with longer daylight hours, less rainfall, and a significant increase in UV index. With the sun reigning supreme and minimal cloud coverage, outdoor activities require sun protection measures. Weather in July »
Weather in August
August in Pasadena sees a further rise in the temperature, continuing the summer trend with 87.1°F (30.6°C) being the highest temperature of the month. The prevailing warm climate and extended daylight hours offer an optimal environment for outdoor enthusiasts and nature lovers. Weather in August »
Weather in September
September squeezes the summer in Pasadena a bit more, maintaining an average high temperature of 84.4°F (29.1°C). As the year progresses towards its end, the weather in September stays relatively warm but introduces the onset of cooler nights. Weather in September »
Weather in October
With the arrival of October, Pasadena begins to cool down, dropping to 77.5°F (25.3°C) on the higher end of the temperature range. Signifying the onset of fall, October heralds comfortable autumn weather, marked by a subtle drop in temperatures. Weather in October »
Weather in November
In November, Pasadena, California experiences a more significant drop in temperature, the highest reaching only 69.6°F (20.9°C) as compared to October's 77.5°F (25.3°C). The arrival of November brings along the late autumn chill, heralding the imminent arrival of winter. Weather in November »
Weather in December
Pasadena, California, welcomes winter in December with temperatures dropping to an average low of 46.8°F (8.2°C). The brisk chill in the air indicates the onset of the holiday season and closes off the year on a cooler note. Weather in December »
Updated: Jun 5, 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 Pasadena, during the entire year, the rain falls for 50.1 days and collects up to 8.5" (216mm) of precipitation.
What are the months with the least sunshine?
January, February and December, with an average of 6.9h of sunshine, are months with the least sunshine.
What is the rainiest month?
February is the month with the most rainfall. Rain falls for 5.8 days and accumulates 1.77" (45mm) of precipitation.
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.
What is the most humid month?
The most humid month is June, with an average relative humidity of 58%.
What is the driest month?
June is the month with the least rainfall. Rain falls for 1.1 days and accumulates 0.04" (1mm) of precipitation.
When are the longest days?
The month with the longest days is June, with an average of 14h and 24min of daylight.
What are the months with the most sunshine?
The months with the most sunshine are June and July, with an average of 12.1h of sunshine.
When is the highest UV index in Pasadena?
The months with the highest UV index are June through September, with an average maximum UV index of 6.
What part of the year is the hottest?
Pasadena's August weather, with an average high temperature of 87.1°F (30.6°C) and an average low temperature of 64.9°F (18.3°C), tends to be the warmest of the year.
What is the least humid month?
The least humid month is November, with an average relative humidity of 47%.
What is the coldest time of year?
December, noted for its average high-temperature of 61.7°F (16.5°C) and an average low-temperature of 46.8°F (8.2°C), is considered the coldest month.
What is the month with the shortest days?
With an average of 9h and 54min of daylight, December has the shortest days of the year.
When is the lowest UV index?
December is the month with the lowest UV index, with an average maximum UV index of 3.
Average temperature
Pasadena, CA
The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is December (61.7°F).
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (46.6°F).
Average pressure
Pasadena, CA
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.05"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.97"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.88"Hg
- Average pressure in July:
29.91"Hg - Average pressure in August:
29.89"Hg - Average pressure in September:
29.89"Hg - Average pressure in October:
29.95"Hg - Average pressure in November:
30.03"Hg - Average pressure in December:
30.08"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
Pasadena, CA
- Average wind speed in January:
5.3mph - Average wind speed in February:
5mph - Average wind speed in March:
5.2mph - Average wind speed in April:
5.8mph - Average wind speed in May:
5.6mph - Average wind speed in June:
5.1mph
- Average wind speed in July:
4.8mph - Average wind speed in August:
4.5mph - Average wind speed in September:
4.4mph - Average wind speed in October:
4.5mph - Average wind speed in November:
4.9mph - Average wind speed in December:
5.2mph
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
Pasadena, CA
The month with the highest relative humidity is June (58%).
The month with the lowest relative humidity is November (47%).
Average rainfall
Pasadena, CA
- Average rainfall in January:
1.57" - Average rainfall in February:
1.77" - Average rainfall in March:
1.14" - Average rainfall in April:
0.59" - Average rainfall in May:
0.2" - Average rainfall in June:
0.04"
- Average rainfall in July:
0.24" - Average rainfall in August:
0.12" - Average rainfall in September:
0.16" - Average rainfall in October:
0.24" - Average rainfall in November:
0.79" - Average rainfall in December:
1.65"
The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days
Pasadena, CA
- Average rainfall days in January:
5.7 days - Average rainfall days in February:
5.8 days - Average rainfall days in March:
7.8 days - Average rainfall days in April:
5.3 days - Average rainfall days in May:
3.7 days - Average rainfall days in June:
1.1 days
- Average rainfall days in July:
3.2 days - Average rainfall days in August:
1.5 days - Average rainfall days in September:
2.6 days - Average rainfall days in October:
2.8 days - Average rainfall days in November:
4.5 days - Average rainfall days in December:
6.1 days
The month with the highest number of rainy days is March (7.8 days).
The month with the least rainy days is June (1.1 days).
Average daylight / Average sunshine
Pasadena, CA
- Average daylight in January:
10h and 1min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 0min - Average daylight in June:
14h and 2min
- Average daylight in July:
14h and 1min - Average daylight in August:
13h and 2min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 2min - Average daylight in November:
10h and 2min - Average daylight in December:
9h and 5min
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 January:
6h and 5min - Average sunshine in February:
6h and 5min - Average sunshine in March:
8h and 5min - Average sunshine in April:
11h and 2min - Average sunshine in May:
11h and 5min - Average sunshine in June:
12h and 1min
- Average sunshine in July:
12h and 1min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 5min - Average sunshine in October:
8h and 4min - Average sunshine in November:
7h and 2min - Average sunshine in December:
6h and 5min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 54min).
Average sunshine days
Pasadena, CA
- Average sunshine days in January:
24.7 days - Average sunshine days in February:
21.5 days - Average sunshine days in March:
22.8 days - Average sunshine days in April:
24.5 days - Average sunshine days in May:
25.3 days - Average sunshine days in June:
27.5 days
- Average sunshine days in July:
25.4 days - Average sunshine days in August:
27.2 days - Average sunshine days in September:
25.2 days - Average sunshine days in October:
27.1 days - Average sunshine days in November:
24.7 days - Average sunshine days in December:
23.4 days
The month with the most sunshine days is June (27.5 days).
The month with the least sunshine days is February (21.5 days).
Average UV index
Pasadena, CA
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
Pasadena, CA
The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility
Pasadena, 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).
Pasadena, California, USA
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