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May Weather in Norwalk, United States

Last updated: June 24, 2025

In May, the average temperature in Norwalk, United States hovers around 17°C (63°F). Expect a wide range, with minimums dropping to 1°C (35°F) and maximums soaring to 36°C (97°F). Be prepared for some rain, as 171 mm (6.7 in) of precipitation can fall over 17 days. On top of that, the air tends to be quite moist, with an average humidity of 77%.

May Temperature in Norwalk

In May in Norwalk, the average temperature is 17°C (63°F). The maximum can reach 36°C (97°F), and the minimum can be as low as 1°C (35°F). This range makes it essential for travelers to pack accordingly, ensuring comfort for both warm and cooler moments.

May Weather in Norwalk: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Norwalk, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Norwalk, May typically has an average temperature of 17°C (63°F), with highs reaching up to 36°C (97°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec232440506275777469533931
Data source: Temperature data for Norwalk generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Norwalk

In Norwalk in May, the precipitation amount is 171 mm (6.7 in) over the course of 17 days.

May Precipitation Trends in Norwalk

The chart displays monthly precipitation patterns in Norwalk, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Norwalk, May typically receives around 171 mm (6.7 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec3840837217112267821121263937
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Norwalk

In Norwalk in May, humidity is 77%. With an average temperature of 17°C (63°F), this humidity feels like a cozy blanket wrapped around you, creating a muggy atmosphere that can be a bit uncomfortable for traveling, making you want to seek shade and hydration as you explore.

May Average Humidity in Norwalk

This chart illustrates the average monthly humidity levels in Norwalk, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Norwalk is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Norwalk

In Norwalk in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Norwalk.

Maximum UV Index Levels in Norwalk for May

The chart shows the monthly maximum UV Index (UVI) for Norwalk in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Norwalk typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Norwalk May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in Norwalk Compares to Other Months

Weather in Norwalk varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Norwalk, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Norwalk, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)38 mm (1.5 inches)78%moderate
February Weather-4°C (24°F)40 mm (1.6 inches)80%moderate
March Weather4°C (40°F)83 mm (3.3 inches)77%high
April Weather10°C (50°F)72 mm (2.9 inches)77%very high
May Weather17°C (63°F)171 mm (6.7 inches)77%very high
June Weather24°C (75°F)122 mm (4.8 inches)81%extreme
July Weather25°C (78°F)67 mm (2.6 inches)81%very high
August Weather24°C (75°F)82 mm (3.2 inches)77%very high
September Weather20°C (69°F)112 mm (4.4 inches)73%very high
October Weather11°C (53°F)126 mm (4.9 inches)75%high
November Weather4°C (39°F)39 mm (1.5 inches)85%moderate
December Weather0°C (31°F)37 mm (1.5 inches)83%moderate

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