Last updated: June 24, 2025
In May, the average temperature in Monmouth, United States hovers around 13°C (55°F). However, you can expect a range, with minimums dipping to 1°C (34°F) and maximums soaring to 31°C (88°F). The weather brings about 79 mm (3.1 in) of precipitation, typically over 9 days, while the average humidity rests at a comfortable 78%.
In May in Monmouth, the average temperature is 13°C (55°F), with a maximum that can reach 31°C (88°F) and a minimum that can drop to as low as 1°C (34°F). This range suggests that travelers should be prepared for both warm days and cool evenings, making layering a smart choice for your visit.
In Monmouth in May, the precipitation amount is 79 mm (3.1 in) spread over 9 days.
In Monmouth in May, humidity is 78%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket enveloping you, making outdoor activities feel steamy and your clothes cling uncomfortably, often leaving you longing for a cool breeze or an air-conditioned escape while exploring.
In Monmouth 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 Monmouth.
UV Risk Categories
Weather in Monmouth varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Monmouth, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 82 mm (3.2 inches) | 91% | low |
| February Weather | -4°C (25°F) | 84 mm (3.3 inches) | 89% | moderate |
| March Weather | 0°C (32°F) | 72 mm (2.8 inches) | 85% | moderate |
| April Weather | 6°C (44°F) | 118 mm (4.6 inches) | 84% | very high |
| May Weather | 13°C (55°F) | 79 mm (3.1 inches) | 78% | very high |
| June Weather | 18°C (65°F) | 67 mm (2.6 inches) | 72% | very high |
| July Weather | 21°C (71°F) | 117 mm (4.6 inches) | 75% | very high |
| August Weather | 21°C (70°F) | 85 mm (3.3 inches) | 74% | very high |
| September Weather | 17°C (63°F) | 73 mm (2.9 inches) | 77% | high |
| October Weather | 11°C (52°F) | 128 mm (5.1 inches) | 85% | moderate |
| November Weather | 3°C (38°F) | 107 mm (4.2 inches) | 86% | moderate |
| December Weather | -3°C (27°F) | 114 mm (4.5 inches) | 85% | low |