May Weather in Waterloo

Last updated: March 2, 2024

The weather in Waterloo, United States, during May is characterized by an average temperature of 20°C (68°F). Highs can soar to 35°C (96°F), while lows may dip to 9°C (49°F). Typically, the humidity level in Waterloo throughout May hovers around 71%.

9°C (49°F)

Minimum temperature

20°C (68°F)

Average temperature

35°C (96°F)

Maximum temperature

71%

Humidity

Precipitation and Sunshine hours

In May, Waterloo averages 20 mm (0.8 inches) of rainfall, typically over the course of 2 rainy days. The month enjoys an average of 14 hours 14 minutes of daylight, with the sun shining for approximately 11 hours 47 minutes each day. Additionally, there is a 87% probability of sunny days during this period.

20 mm (0.8 inches)

Precipitation

2 rainy days

Rainy days

11 hours 47 minutes

Sunshine hours

87%

Chance of sun

UV Index

In May, the UV Index in Waterloo reaches a maximum of 10, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 15 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00
UVI	1	2	4	6	8	10	10	9	8	5	3	2	1
Exposure	Low		Moderate	High	VeryHigh					Moderate		Low
Time to burn	45 min		30 min	25 min	15 min					30 min		45 min