Weather for Grandfalls, Texas
Current Weather
Five Day Weather Forecast
Mon
H: 101°F
L: 68°F
Tue
H: 95°F
L: 71°F
Wed
H: 89°F
L: 69°F
Thu
H: 94°F
L: 70°F
Fri
H: 94°F
L: 71°F
Air Quality
Nitrogen Dioxide: 1.15 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 124 μg/m3
Astronomical
Sun Transit: 1:48 PM
Sunset: 8:44 PM
Daylight: 13 hrs 49 mins
Moon Transit: 3:51 PM
Moonset: 11:26 PM
Moon Phase: New
Moon Illumination: 2.6%
Best Times for Fishing or Hunting
Major Periods
12:59 AM - 3:29 AM3:21 PM - 5:51 PM
Minor Periods
12:00 AM - 12:00 AM7:47 AM - 9:17 AM
Action Rating: 3 out of 5
Red Flag Warning issued May 18 at 1:38AM CDT until May 18 at 9:00PM CDT by NWS Midland/Odessa TX
Effective: Mon May 18, 2026, 1:38 AM
Expires: Mon May 18, 2026, 1:45 PM
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM CDT /8 PM MDT/ THIS EVENING FOR 20 FOOT WINDS OF 20 MPH OR GREATER, RELATIVE HUMIDITY OF LESS THAN 15%, AND HIGH TO VERY HIGH FIRE DANGER FOR SOUTHEAST NEW MEXICO, THE GUADALUPE MOUNTAINS AND SURROUNDING FOOTHILLS AND PLAINS, AND THE NORTHWESTERN PERMIAN BASIN... The National Weather Service in Midland/Odessa has issued a Red Flag Warning for wind and low relative humidity, which is in effect from noon today to 9 PM CDT this evening. * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 5 percent. * RFTI...5 or critical. * IMPACTS... * SEVERITY... FUELS (ERC)...90th+ percentile...5 (out of 5). WEATHER...Critical...3 (out of 5). FIRE ENVIRONMENT...7 (out of 10).
A Red Flag Warning means that critical fire weather conditions are either occurring now or will shortly. A combination of strong winds, low relative humidity and warm temperatures will increase potential for fire growth.
Weather Forecast
Air Quality
Nitrogen Dioxide: 1.91 μg/m3
Sulphur Dioxide: 1.94 μg/m3
Ozone: 100.36 μg/m3
Astronomical
Sun Transit: 1:48 PM
Sunset: 8:44 PM
Daylight: 13 hrs 49 mins
Moon Transit: 3:51 PM
Moonset: 11:26 PM
Moon Phase: New
Moon Illumination: 2.6%
Best Times for Fishing or Hunting
Major Periods
12:59 AM - 3:29 AM3:21 PM - 5:51 PM
Minor Periods
12:00 AM - 12:00 AM7:47 AM - 9:17 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 2.2 μg/m3
Sulphur Dioxide: 2.03 μg/m3
Ozone: 92.64 μg/m3
Astronomical
Sun Transit: 1:48 PM
Sunset: 8:44 PM
Daylight: 13 hrs 51 mins
Moon Transit: 4:57 PM
Moonset: 12:26 AM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%
Best Times for Fishing or Hunting
Major Periods
2:06 AM - 4:36 AM4:27 PM - 6:57 PM
Minor Periods
8:55 AM - 10:25 AM12:00 AM - 12:00 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 1.66 μg/m3
Sulphur Dioxide: 1.5 μg/m3
Ozone: 82.64 μg/m3
Astronomical
Sun Transit: 1:48 PM
Sunset: 8:45 PM
Daylight: 13 hrs 52 mins
Moon Transit: 6:00 PM
Moonset: 12:25 AM
Moon Phase: Waxing Crescent
Moon Illumination: 14.4%
Best Times for Fishing or Hunting
Major Periods
3:10 AM - 5:40 AM5:30 PM - 8:00 PM
Minor Periods
10:07 AM - 11:37 AM12:00 AM - 12:00 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 1.63 μg/m3
Sulphur Dioxide: 1.33 μg/m3
Ozone: 81.32 μg/m3
Astronomical
Sun Transit: 1:48 PM
Sunset: 8:46 PM
Daylight: 13 hrs 53 mins
Moon Transit: 6:55 PM
Moonset: 1:13 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%
Best Times for Fishing or Hunting
Major Periods
4:09 AM - 6:39 AM6:25 PM - 8:55 PM
Minor Periods
11:18 AM - 12:48 AM12:43 AM - 2:13 AM
Action Rating: 4 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 1.8 μg/m3
Sulphur Dioxide: 1.73 μg/m3
Ozone: 79.38 μg/m3
Astronomical
Sun Transit: 1:48 PM
Sunset: 8:46 PM
Daylight: 13 hrs 54 mins
Moon Transit: 7:45 PM
Moonset: 1:53 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%
Best Times for Fishing or Hunting
Major Periods
5:03 AM - 7:33 AM7:15 PM - 9:45 PM
Minor Periods
12:25 AM - 1:55 PM1:23 AM - 2:53 AM
Action Rating: 2 out of 5