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May Weather in Jefferson, United States

Last updated: June 24, 2025

In May, the average temperature in Jefferson, United States hovers around 15°C (59°F). However, prepare for a chilly breeze as temperatures can dip to a minimum of -1°C (31°F), while occasionally soaring to a warm 30°C (87°F). Expect 128 mm (5.0 in) of precipitation spread over 15 days, contributing to a notably high average humidity of 81%.

May Temperature in Jefferson

In May in Jefferson, the average temperature is 15°C (59°F). Maximums can reach 30°C (87°F) and minimums can be as low as -1°C (31°F). Be prepared for varying weather conditions and pack accordingly for a comfortable trip.

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

The chart illustrates May temperature patterns in Jefferson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jefferson, May typically has an average temperature of 15°C (59°F), with highs reaching up to 30°C (87°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec293137475968737166564134
Data source: Temperature data for Jefferson 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 Jefferson

In Jefferson in May, the precipitation amount is 128 mm (5.0 in) over the course of 15 days.

May Precipitation Trends in Jefferson

The chart displays monthly precipitation patterns in Jefferson, 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 Jefferson, May typically receives around 128 mm (5.0 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec91949711412812314510192128108103
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Jefferson

In Jefferson in May humidity is 81%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket draped over you, making traveling quite uncomfortable as you constantly wipe away beads of sweat and feel the stickiness clinging to your clothes.

May Average Humidity in Jefferson

This chart illustrates the average monthly humidity levels in Jefferson, 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 Jefferson is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Jefferson

In Jefferson 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 Jefferson.

Maximum UV Index Levels in Jefferson for May

The chart shows the monthly maximum UV Index (UVI) for Jefferson 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 Jefferson typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Jefferson 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 Jefferson Compares to Other Months

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

This table compares monthly weather conditions in Jefferson, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)91 mm (3.6 inches)88%moderate
February Weather-1°C (31°F)94 mm (3.7 inches)88%moderate
March Weather3°C (38°F)97 mm (3.8 inches)87%high
April Weather8°C (47°F)114 mm (4.5 inches)87%very high
May Weather15°C (59°F)128 mm (5.0 inches)81%very high
June Weather20°C (68°F)123 mm (4.8 inches)83%very high
July Weather23°C (73°F)145 mm (5.7 inches)82%very high
August Weather22°C (71°F)101 mm (4.0 inches)76%very high
September Weather19°C (66°F)92 mm (3.6 inches)77%very high
October Weather13°C (56°F)127 mm (5.0 inches)82%high
November Weather5°C (41°F)108 mm (4.2 inches)89%moderate
December Weather1°C (35°F)103 mm (4.1 inches)86%low

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