May weather - Spring 2024

Weather in May
Frequently asked questions
Average temperature in May
Average pressure in May
Average wind speed in May
Average humidity in May
Average rainfall in May
Average rainfall days in May
Average daylight in May
Average sunshine in May
Average sunshine days in May
Average UV index in May
Average cloud cover in May
Average visibility in May

Pasadena City Hall in California, with neon-lit paths and natural gardens, under a perfect blue night sky

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. The city blooms in this temperature, with clear skies and high visibility permitting perfect views of the sunlit landscapes. Locals and tourists relish in outdoor activities, taking advantage of the extended daylight and comfortable breeze. Slight increments in temperature do not compromise the overall pleasant feel of the month, securing May as a loved month by weather enthusiasts.

Temperature

Pasadena experiences an average high-temperature of a warm 73.9°F (23.3°C) in May, subtly different from April's 71.2°F (21.8°C). An average low-temperature of 54.1°F (12.3°C) marks the nights throughout May.

Humidity

In May, the average relative humidity is 57%.

Rainfall

In Pasadena, during May, the rain falls for 3.7 days and regularly aggregates up to 0.2" (5mm) of precipitation. Throughout the year, there are 50.1 rainfall days, and 8.5" (216mm) of precipitation is accumulated.

Daylight

In May, the average length of the day is 13h and 58min.
On the first day of the month, sunrise is at 6:02 am and sunset at 7:37 pm. On the last day of May, in Pasadena, sunrise is at 5:41 am and sunset at 7:58 pm PDT.

Sunshine

In May, the average sunshine is 11.8h.

UV index

In Pasadena, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A typical high UV index of 5 in May suggests the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.

Updated: Jun 5, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in May?

The average high-temperature, in May, in Pasadena, is 73.9°F (23.3°C), while the average low-temperature is 54.1°F (12.3°C).

What is the average humidity in May?

In Pasadena, the average relative humidity in May is 57%.

How much does it rain in May?

In Pasadena, in May, during 3.7 rainfall days, 0.2" (5mm) of precipitation is typically accumulated.

How many hours of daylight does Pasadena have in May?

In May, the average day length is 13h and 58min.

What time are sunrise and sunset in May?

In May, on the first day of the month, sunrise is at 6:02 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 7:58 pm PDT.

How many hours of sunshine does Pasadena have in May?

In May, the average sunshine duration is 11.8h.

What is the UV index reading in May?

In Pasadena, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A May J J A S O N D

Apr

May

Jun

Average high temperature

71.2°F 21.8°C

73.9°F 23.3°C

80.2°F 26.8°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

6.3mph 10.1km/h

5.8mph 9.3km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

24.5

25.3

27.5

Average UV index

Average cloud cover

16%

12%

Average visibility

6mi 9.7km

Average temperature in May
Pasadena, CA

Average high temperature in May: 73.9°F

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).

Average low temperature in May: 54.1°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 in May
Pasadena, CA

Average pressure in May: 29.92"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 May
Pasadena, CA

Average wind speed in May: 5.6mph

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 May
Pasadena, CA

Average humidity in May: 57%

The month with the highest relative humidity is June (58%).
The month with the lowest relative humidity is November (47%).

Average rainfall in May
Pasadena, CA

Average rainfall in May: 0.2"

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 in May
Pasadena, CA

Average rainfall days in May: 3.7 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 in May /
Average sunshine in May
Pasadena, CA

Average daylight in May: 14h and 0min

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 May: 11h 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 in May
Pasadena, CA

Average sunshine days in May: 25.3 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 in May
Pasadena, CA

Average UV index in May: 5

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 May
Pasadena, CA

Average cloud cover in May: 12

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 in May
Pasadena, CA

Average visibility in May: 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).

May weather forecast
Pasadena, CA

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