Grand Junction weather in May: Grand Junction, Colorado: normal highs, lows, rain and records for May
Grand Junction in May has a normal high of 77°F and a normal low of 47°F, a daily mean of 62°F, rising from 70°F on the 1st to 84°F by the 31st. Measurable precipitation falls on 6 days in a normal May, 0.83 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 8°C, 21 mm of precipitation and 0 cm of snow in May.
- NOAA stationGrand Junction Walker Field
- Station IDUSW00023066
- Location39.13°N 108.54°W
- Elevation4,858 ft (1,481 m)
- From the center3 miles
- Population70,554
- Jan 38° 17°
- Feb 46° 24°
- Mar 58° 32°
- Apr 66° 38°
- May 77° 47°
- Jun 89° 57°
- Jul 95° 64°
- Aug 91° 62°
- Sep 82° 53°
- Oct 67° 40°
- Nov 52° 28°
- Dec 39° 18°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Grand Junction in May?
The normal high is 77°F and the normal low 47°F, for a daily mean of 62.0°F. May is 10.1°F warmer than April and 11.0°F cooler than June. May is the 5th warmest month of the year in Grand Junction and the 5th wettest. Across the month the normal high rises 14°F, from 70°F on May 1 to 84°F on May 31. From one year to the next May's mean temperature typically moves about 2.8°F either way (NOAA's standard deviation), so roughly two Mays in three average between 59°F and 65°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 23%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 70°F | 42°F | 23% | 9% |
| May 8 | 73°F | 45°F | 22% | 9% |
| May 15 | 76°F | 47°F | 21% | 9% |
| May 22 | 80°F | 49°F | 19% | 8% |
| May 31 | 84°F | 52°F | 16% | 6% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 70°F | 42°F | 23% | 9% | 13 h 50 min |
| May 2 | 71°F | 43°F | 23% | 9% | 13 h 50 min |
| May 3 | 71°F | 43°F | 23% | 9% | 13 h 50 min |
| May 4 | 72°F | 43°F | 23% | 9% | 14 h |
| May 5 | 72°F | 44°F | 22% | 9% | 14 h |
| May 6 | 72°F | 44°F | 22% | 9% | 14 h |
| May 7 | 73°F | 44°F | 22% | 9% | 14 h |
| May 8 | 73°F | 45°F | 22% | 9% | 14 h |
| May 9 | 74°F | 45°F | 22% | 9% | 14 h 10 min |
| May 10 | 74°F | 45°F | 22% | 9% | 14 h 10 min |
| May 11 | 75°F | 46°F | 21% | 9% | 14 h 10 min |
| May 12 | 75°F | 46°F | 21% | 9% | 14 h 10 min |
| May 13 | 75°F | 46°F | 21% | 9% | 14 h 10 min |
| May 14 | 76°F | 47°F | 21% | 9% | 14 h 20 min |
| May 15 | 76°F | 47°F | 21% | 9% | 14 h 20 min |
| May 16 | 77°F | 47°F | 20% | 8% | 14 h 20 min |
| May 17 | 77°F | 47°F | 20% | 8% | 14 h 20 min |
| May 18 | 78°F | 48°F | 20% | 8% | 14 h 20 min |
| May 19 | 78°F | 48°F | 20% | 8% | 14 h 20 min |
| May 20 | 79°F | 48°F | 20% | 8% | 14 h 30 min |
| May 21 | 79°F | 49°F | 19% | 8% | 14 h 30 min |
| May 22 | 80°F | 49°F | 19% | 8% | 14 h 30 min |
| May 23 | 80°F | 49°F | 19% | 8% | 14 h 30 min |
| May 24 | 80°F | 50°F | 19% | 8% | 14 h 30 min |
| May 25 | 81°F | 50°F | 18% | 7% | 14 h 30 min |
| May 26 | 81°F | 50°F | 18% | 7% | 14 h 40 min |
| May 27 | 82°F | 51°F | 18% | 7% | 14 h 40 min |
| May 28 | 82°F | 51°F | 17% | 7% | 14 h 40 min |
| May 29 | 83°F | 51°F | 17% | 7% | 14 h 40 min |
| May 30 | 83°F | 52°F | 17% | 7% | 14 h 40 min |
| May 31 | 84°F | 52°F | 16% | 6% | 14 h 40 min |
- Normal high
- 77°FMay average
- Normal low
- 47°FMay average
- Precipitation
- 0.83 inmonth total
- Days with precipitation
- 60.01 inch or more
- Snowfall
- 0.1 inmonth total
- Days at 90°F or more
- 2
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 50 min to 14 h 40 minMay 1 to May 31
- Days at 70°F or more
- 24
- Days at 80°F or more
- 14
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023066; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Grand Junction in May?
On a given May day the chance of 0.01 inch or more is 20% on average, highest around May 1 (23%). In all, 0.83 in falls on 6 days of a normal May.
In a normal May in Grand Junction, 2 days reach 90°F, 1 nights fall to freezing and snowfall averages 0.1 inches.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023066.
How humid and windy is Grand Junction in May?
At 3 p.m. the normal temperature is 80°F with 16% relative humidity and a dew point of 30°F; at 6 a.m. it is 58°F with 42% humidity. The wind averages 9.2 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 58°F | 35°F | 42% | 8.1 mph | 80% |
| 9 a.m. | 69°F | 35°F | 29% | 9.2 mph | 81% |
| noon | 77°F | 32°F | 19% | 9.1 mph | 78% |
| 3 p.m. | 80°F | 30°F | 16% | 12.2 mph | 73% |
| 6 p.m. | 78°F | 29°F | 17% | 11.6 mph | 75% |
| 9 p.m. | 67°F | 31°F | 26% | 7.7 mph | 80% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023066. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for May in Grand Junction?
The warmest May temperature on Grand Junction's official record (since 1893) is 101°F, on May 29, 2000; the coldest is 24°F, on May 1, 2011. The wettest May brought 2.74 in (1906); the snowiest, 5.0 inches (1979).
The May mean against the 1991-2020 normal of 62.0°F: 2021 63.5°F (+1.5), 2022 61.7°F (−0.3), 2023 65.2°F (+3.2), 2024 62.1°F (+0.1), 2025 64.4°F (+2.4), 2026 63.6°F (+1.6). 5 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.5°F | +1.5°F | 0.53 in |
| 2022 | 61.7°F | −0.3°F | 0.34 in |
| 2023 | 65.2°F | +3.2°F | 0.18 in |
| 2024 | 62.1°F | +0.1°F | 0.48 in |
| 2025 | 64.4°F | +2.4°F | 0.56 in |
| 2026 | 63.6°F | +1.6°F | 0.44 in |
Source: records: ACIS, NWS threaded record GJTthr; recent months: ACIS, station USW00023066. Records and recent months use complete months only.
How does May in Grand Junction compare across Colorado?
Across the 125 places PlainClimate covers in Colorado, May normal highs run from 54°F in Leadville to 80°F in Lamar; Grand Junction's is 77°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.