When summer arrives in Western Colorado, residents know to expect hot, dry afternoons. However, a handful of days stand out in the record books as some of the hottest ever experienced in Grand Junction. According to official National Weather Service and NOAA climate records, the city’s highest recorded temperature is 107°F, a mark reached twice in recent years.
Of the top ten hottest days in our history, 8 have taken place in July, and two in mid to late June.
Recent Years Have Dominated the Record Book
One interesting trend is how many of these record-setting temperatures have occurred in the past few years. Four of the top ten hottest days happened between 2020 and 2023, including both all-time record highs of 107°F.
While Grand Junction has always experienced hot summers thanks to its high-desert climate, recent years have produced several notable heat waves that pushed temperatures into record territory.
Why Grand Junction Gets So Hot
Grand Junction sits at an elevation of about 4,600 feet in Colorado’s Grand Valley. Although the elevation provides cooler nights than many desert locations, daytime temperatures can climb rapidly during the summer.
Several factors contribute to the city’s extreme heat:
- A dry desert climate with very low humidity.
- Abundant sunshine, often more than 300 sunny days each year.
- Surrounding mesas and canyon walls that trap warm air.
- High-pressure weather systems that can linger for days during the summer.
Unlike humid climates where the heat index can exceed the air temperature, Grand Junction’s heat is usually very dry. Even so, temperatures above 100°F can quickly lead to dehydration and heat-related illnesses without proper precautions.
Even healthy adults can become overheated after spending extended periods outdoors during extreme heat.
A Look at Grand Junction’s Climate History
Grand Junction has been keeping official weather records for well over a century, making it possible to compare today’s temperatures with those from decades ago. While the city has occasionally reached 105°F since the 1920s, the appearance of multiple record-setting days during the past several years highlights just how intense recent summer heat waves have been.
Whether you’re a longtime resident or just visiting Western Colorado, these record temperatures are a reminder that Grand Junction can experience some of the hottest weather in the state. As another summer unfolds, residents will once again be watching the thermometer to see if a new chapter is added to the city’s weather history.
To recap: Here are the 10 hottest days officially recorded in Grand Junction:
- July 17, 2023 – 107°F (Tied Record)
- July 9, 2021 – 107°F (Tied Record)
- July 21, 2005 – 106°F
- July 23, 2023 – 105°F
- June 16, 2021 – 105°F
- June 27, 1990 – 105°F
- July 10, 1976 – 105°F
- July 12, 2003 – 105°F
- July 13, 2020 – 105°F
- July 15, 1925 – 105°F
Why aren’t Palisade and Fruita included?
Grand Junction’s weather records come from the official National Weather Service climate station at Grand Junction Regional Airport, which has a long, continuous record and published climate extremes. While Palisade and Fruita have weather observations, they do not have the same type of long-term official climate record with a published ranking of all-time highest temperatures. As a result, an official “Top 10 Hottest Days” list is not readily available for those communities.
Source: National Weather Service (NOAA) climate records for Grand Junction Regional Airport.