Guymon, Oklahoma Weather
Guymon weather this week
Over the next 7 days in Guymon, daytime highs range from 5°C to 20°C and night-time lows from 4°C to 11°C. The warmest afternoon is likely on Wednesday at 20°C, while the coolest night is expected tonight at 4°C. Temperatures trend warmer through the week, rising by about 7°C.
Rain is most likely today and Friday, with roughly 4.3 mm forecast in total over the week. Fog may reduce visibility in the mornings tomorrow, so drive with low-beam lights and extra caution.
It turns breezy on Tuesday, with winds reaching about 46 km/h — secure loose objects on rooftops and balconies. UV levels stay moderate or lower, peaking at 4. Average humidity is a comfortable 73% or so.
| Day | Conditions | High / Low | Rain chance | Rain | Max wind |
|---|---|---|---|---|---|
| Today (Sunday) | Light drizzle | 5° / 4° | 56% | 0.4 mm | 16 km/h |
| Tomorrow (Monday) | Fog | 11° / 5° | 0% | 0.0 mm | 31 km/h |
| Tuesday | Overcast | 14° / 7° | 0% | 0.0 mm | 46 km/h |
| Wednesday | Overcast | 20° / 10° | 0% | 0.0 mm | 38 km/h |
| Thursday | Overcast | 17° / 8° | 0% | 0.0 mm | 35 km/h |
| Friday | Drizzle | 19° / 11° | 20% | 3.9 mm | 43 km/h |
| Saturday | Overcast | 17° / 7° | 20% | 0.0 mm | 18 km/h |
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Today's outlook for Guymon
At 00:00 local time it is 5°C in Guymon with fog, feeling like 1°C. Today's forecast high is 5°C and the low is 4°C, and the day overall looks drizzly. There is a 56% chance of a shower today. Winds are blowing at about 16 km/h from the south-east. Humidity is 98%.
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Climate of Guymon: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Guymon, with average daytime highs around 36°C. January is the coolest, when nights typically fall to about -4°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 40°C, so the seasons feel very different from each other.
The area receives about 460 mm of rain in a typical year. Rainfall is modest in every month; August is the wettest at about 72 mm. The driest stretch is November to February, with under 20 mm a month.
For outdoor plans and travel, April to May and September to October usually offer the most comfortable weather in Guymon, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 9° | -4° | 12 mm | 59% |
| Feb | 11° | -3° | 12 mm | 56% |
| Mar | 18° | 1° | 26 mm | 51% |
| Apr | 23° | 6° | 38 mm | 47% |
| May | 28° | 12° | 55 mm | 48% |
| Jun | 34° | 19° | 68 mm | 49% |
| Jul | 36° | 21° | 63 mm | 47% |
| Aug | 34° | 20° | 72 mm | 52% |
| Sep | 30° | 15° | 39 mm | 52% |
| Oct | 22° | 7° | 44 mm | 54% |
| Nov | 15° | 1° | 14 mm | 55% |
| Dec | 9° | -4° | 18 mm | 60% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Guymon. Values describe typical conditions, not a forecast.
About Guymon weather
Guymon is a place in Oklahoma's position on the southern Great Plains, known for volatile weather and severe thunderstorms, located about 381 km west of Oklahoma City. Guymon gets hot summers (June–August) with highs often above 35°C each year. Guymon closes out the year with cold, changeable winters with occasional ice storms and snow. This page shows live, auto-refreshing weather for Guymon: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Guymon is about 381 km west of Oklahoma City, in Oklahoma.
Guymon sees cold, changeable winters with occasional ice storms and snow.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Guymon's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Guymon, with average daytime highs of about 36°C and nights around 21°C.
The coldest nights come in January, when the average low is about -4°C and daytime highs reach around 9°C. Frost is possible on clear, calm nights.
Guymon receives about 460 mm of rain in a typical year. August is the wettest month at roughly 72 mm; no month averages more than 100 mm.
April to May and September to October usually offer the most comfortable weather in Guymon, with mild daytime temperatures and little rain.
In November Guymon typically sees daytime highs near 15°C and lows near 1°C, with about 14 mm of rain over the month and average humidity around 55%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Guymon updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Guymon's day-to-day weather follows the broader pattern of Oklahoma described above. See the hourly weather forecast or the air quality index for more detail.