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May Weather in Effingham, United States

Last updated: June 24, 2025

In May, the average temperature in Effingham, United States is a pleasant 20°C (67°F). Expect a range from a chilly 2°C (36°F) to a warm 35°C (94°F) throughout the month. You'll likely experience 151 mm (6.0 in) of precipitation over 14 days, contributing to an average humidity level of 80%.

May Temperature in Effingham

In May in Effingham, the average temperature is 20°C (67°F), with maximums reaching up to 35°C (94°F) and minimums dropping to as low as 2°C (36°F). This varied climate makes Effingham an ideal destination for travelers seeking both warmth and cooler respite during their adventures.

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

The chart illustrates May temperature patterns in Effingham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Effingham, May typically has an average temperature of 20°C (67°F), with highs reaching up to 35°C (94°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec323546556776797672594338
Data source: Temperature data for Effingham 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 Effingham

In Effingham in May, the precipitation amount is 151 mm (6.0 in) spread over a duration of 14 days.

May Precipitation Trends in Effingham

The chart displays monthly precipitation patterns in Effingham, 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 Effingham, May typically receives around 151 mm (6.0 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec8389133123151107106104681149178
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Effingham

In Effingham in May, humidity is 80%. With an average temperature of 20°C (67°F), this humidity feels like a warm embrace that can make outdoor activities feel sticky and heavy, potentially draining your energy as you explore.

May Average Humidity in Effingham

This chart illustrates the average monthly humidity levels in Effingham, 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 Effingham is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Effingham

In Effingham in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Effingham.

Maximum UV Index Levels in Effingham for May

The chart shows the monthly maximum UV Index (UVI) for Effingham 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 Effingham typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357911111098643
Data source: Effingham 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 Effingham Compares to Other Months

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

This table compares monthly weather conditions in Effingham, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)83 mm (3.3 inches)84%moderate
February Weather2°C (35°F)89 mm (3.5 inches)82%moderate
March Weather8°C (46°F)133 mm (5.2 inches)84%high
April Weather13°C (55°F)123 mm (4.8 inches)83%very high
May Weather20°C (67°F)151 mm (6.0 inches)80%extreme
June Weather25°C (77°F)107 mm (4.2 inches)83%extreme
July Weather26°C (79°F)106 mm (4.2 inches)82%very high
August Weather24°C (76°F)103 mm (4.1 inches)82%very high
September Weather22°C (72°F)68 mm (2.7 inches)79%very high
October Weather15°C (59°F)114 mm (4.5 inches)79%high
November Weather6°C (43°F)91 mm (3.6 inches)88%moderate
December Weather3°C (38°F)78 mm (3.1 inches)87%moderate

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