May weather forecastGrand Junction, CO
May
Weather in May
May in Grand Junction marks the onset of summer. Warmer temperatures prevail, resulting in a distinct shift from Spring, with highs nearly reaching 70.1°F (21.2°C). Days continue to grow longer, and with the least amount of annual rain, outdoor activities become very popular. Increasing UV index indicates stronger sun intensity, making it important for residents to guard against sun exposure. While the warming trend is evident, winds remain brisk, providing occasional relief from the heat.Temperature
Noticing a change, the average high-temperature during May moves from April's refreshing 58.6°F (14.8°C) to a pleasant 69.1°F (20.6°C). Grand Junction records a marked divergence from the day's high temperatures, with nights in May averaging at a chilly 45°F (7.2°C).Humidity
In Grand Junction, the average relative humidity in May is 37%.Rainfall
In May, the rain falls for 7.7 days. Throughout May, 0.55" (14mm) of precipitation is accumulated. In Grand Junction, during the entire year, the rain falls for 93.6 days and collects up to 8.46" (215mm) of precipitation.Snowfall
In Grand Junction, snow does not fall in May through September.Daylight
The average length of the day in May is 14h and 20min.On the first day of the month, sunrise is at 6:14 am and sunset at 8:07 pm. On the last day of May, sunrise is at 5:50 am and sunset at 8:33 pm MDT.
Sunshine
The average sunshine in May is 11.6h.UV index
In May, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 5 during May translates into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Grand Junction, CO
- Average high temperature in May: 69.1°F
The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (34.9°F).
- Average low temperature in May: 45°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in May
Grand Junction, CO
- Average pressure in May: 29.9"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The months with the lowest atmospheric pressure are May and June (29.9"Hg).
Average wind speed in May
Grand Junction, CO
- Average wind speed in May: 7.3mph
The windiest month (with the highest average wind speed) is June (7.5mph).
The calmest month (with the lowest average wind speed) is January (4.2mph).
Average humidity in May
Grand Junction, CO
- Average humidity in May: 37%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is June (29%).
Average rainfall in May
Grand Junction, CO
- Average rainfall in May: 0.55"
The wettest month (with the highest rainfall) is March (1.06").
The driest month (with the least rainfall) is June (0.51").
Average rainfall days in May
Grand Junction, CO
- Average rainfall days in May: 7.7 days
The month with the highest number of rainy days is March (10.4 days).
The month with the least rainy days is November (5.5 days).
Average snowfall in May
Grand Junction, CO
- Average snowfall in May: 0"
The month with the highest snowfall is December (3.74").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Grand Junction, CO
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Grand Junction, CO
- Average daylight in May: 14h and 18min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in May: 11h and 36min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 18min).
Average sunshine days in May
Grand Junction, CO
- Average sunshine days in May: 20.4 days
The month with the most sunshine days is November (22.3 days).
The month with the least sunshine days is February (15.8 days).
Average UV index in May
Grand Junction, CO
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Grand Junction, CO
- Average cloud cover in May: 18
The month with the most cloud cover is January (Cloud cover 31).
The months with the least cloud cover are June and September (Cloud cover 11).
Average visibility in May
Grand Junction, CO
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
