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July Weather in Groton, United States

Last updated: June 24, 2025

In Groton, United States, the average temperature in July hovers around 21°C (71°F), offering a pleasant climate for outdoor activities. Temperatures can vary, dipping to a minimum of 9°C (49°F) and peaking at a toasty 34°C (93°F). Be prepared for some rainy days, as 163 mm (6.4 in) of precipitation typically falls over 17 days. With an average humidity of 78%, it's advisable to stay hydrated and enjoy the lush surroundings!

July Temperature in Groton

In July in Groton, the average temperature is 21°C (71°F). The maximum can reach 34°C (93°F), while the minimum can drop to as low as 9°C (49°F). This weather makes Groton a great destination for travelers seeking mild temperatures and the opportunity to experience both warm and cooler days.

July Weather in Groton: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Groton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Groton, July typically has an average temperature of 21°C (71°F), with highs reaching up to 34°C (93°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec242733455766716962523730
Data source: Temperature data for Groton 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.

July Precipitation in Groton

In Groton in July, the precipitation amount is 163 mm (6.4 in) over the course of 17 days.

July Precipitation Trends in Groton

The chart displays monthly precipitation patterns in Groton, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Groton, July typically receives around 163 mm (6.4 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec89969112413710516311699155102103
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
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July Humidity in Groton

In Groton in July humidity is 78%. With an average temperature of 21°C (71°F), this humidity feels like a warm blanket wrapped around you, making travel a bit more challenging as it can lead to a sticky, heavy sensation, dampening the enjoyment of outdoor activities.

July Average Humidity in Groton

This chart illustrates the average monthly humidity levels in Groton, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Groton is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Groton

In Groton in July, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Groton.

Maximum UV Index Levels in Groton for July

The chart shows the monthly maximum UV Index (UVI) for Groton in July, 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 July, the maximum UV index in Groton typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810101098642
Data source: Groton July 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 July Weather in Groton Compares to Other Months

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

This table compares monthly weather conditions in Groton, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)88 mm (3.5 inches)90%moderate
February Weather-3°C (27°F)96 mm (3.8 inches)90%moderate
March Weather1°C (34°F)91 mm (3.6 inches)87%high
April Weather7°C (45°F)124 mm (4.9 inches)88%very high
May Weather14°C (57°F)137 mm (5.4 inches)82%very high
June Weather19°C (66°F)105 mm (4.1 inches)79%very high
July Weather21°C (71°F)163 mm (6.4 inches)78%very high
August Weather20°C (69°F)116 mm (4.6 inches)76%very high
September Weather17°C (62°F)99 mm (3.9 inches)78%very high
October Weather11°C (52°F)155 mm (6.1 inches)84%high
November Weather3°C (37°F)102 mm (4.0 inches)89%moderate
December Weather-1°C (30°F)102 mm (4.0 inches)86%low

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