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June Weather in Lewiston, United States

Last updated: June 24, 2025

In Lewiston, United States, the weather in June is characterized by an average temperature of 20°C (69°F). However, temperatures can range from a brisk 2°C (36°F) to a scorching 38°C (101°F). Expect a modest precipitation amount of 15 mm (0.6 in) over 3 days, accompanied by an average humidity of 79%. Be prepared for a variety of weather conditions!

June Temperature in Lewiston

In June in Lewiston, the average temperature is 20°C (69°F). Maximum can reach 38°C (101°F) and minimum can be as low as 2°C (36°F). It's a diverse climate, so be prepared for both warm days and cooler nights when traveling.

June Weather in Lewiston: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Lewiston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lewiston, June typically has an average temperature of 20°C (69°F), with highs reaching up to 38°C (101°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec394144515969777567564639
Data source: Temperature data for Lewiston 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.

June Precipitation in Lewiston

In Lewiston in June, the precipitation amount is 15 mm (0.6 in) over the course of 3 days.

June Precipitation Trends in Lewiston

The chart displays monthly precipitation patterns in Lewiston, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Lewiston, June typically receives around 15 mm (0.6 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec16315613782621624125297118
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Lewiston

In Lewiston in June humidity is 79%. With an average temperature of 20°C (69°F), this humidity feels like a warm, steamy embrace, making travel slightly uncomfortable as the air feels heavy and sticky, often leaving you yearning for a cool breeze or air conditioning to escape the dampness.

June Average Humidity in Lewiston

This chart illustrates the average monthly humidity levels in Lewiston, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Lewiston is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%82%81%79%70%60%62%72%87%86%
Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in Lewiston

In Lewiston in June, 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 Lewiston.

Maximum UV Index Levels in Lewiston for June

The chart shows the monthly maximum UV Index (UVI) for Lewiston in June, 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 June, the maximum UV index in Lewiston typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111111109643
Data source: Lewiston June 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 June Weather in Lewiston Compares to Other Months

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

This table compares monthly weather conditions in Lewiston, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)163 mm (6.4 inches)86%moderate
February Weather5°C (41°F)156 mm (6.1 inches)85%moderate
March Weather7°C (44°F)137 mm (5.4 inches)85%high
April Weather11°C (51°F)82 mm (3.2 inches)82%very high
May Weather15°C (59°F)62 mm (2.4 inches)81%extreme
June Weather20°C (69°F)15 mm (0.6 inches)79%extreme
July Weather25°C (77°F)2 mm (0.1 inches)70%extreme
August Weather24°C (76°F)4 mm (0.1 inches)60%very high
September Weather20°C (68°F)12 mm (0.5 inches)62%very high
October Weather13°C (56°F)52 mm (2.0 inches)72%high
November Weather8°C (46°F)97 mm (3.8 inches)87%moderate
December Weather4°C (39°F)118 mm (4.6 inches)86%moderate

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