Weather archive in Grimsstadir
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| Date / Local time | T | Po | P | Pa | U | DD | Ff | ff10 | ff3 | N | WW | W1 | W2 | Tn | Tx | Cl | Nh | H | Cm | Ch | VV | Td | RRR | tR | E | Tg | E' | sss | |
| 2026 August 31, Monday | 18 | 6.4 44 | 722.7 28.45 963.52 963.52 | 757.4 29.82 1009.78 1009.78 | 0.3 0.01 0.4 0.4 | 88 | Wind blowing from the north | Gentle breeze (5 m/s) (18 km/h) (11 miles/hour) (10 knots) (3 Bft) | 100%. 10/10. 8 oktas | 4.4 40 | 9.6 49 | Cumulonimbus calvus, with or without Cumulus, Stratocumulus or Stratus. | 20–30%. 2/10–3/10. 2 oktas | 300-600 984-1968 | Altocumulus cumulogenitus (or cumulonimbogenitus). | 50.0 31.1 | 4.5 40 | 8.0 0.31 | 9 | ||||||||||
15 | 5.7 42 | 722.4 28.44 963.12 963.12 | 757.2 29.81 1009.52 1009.52 | 91 | Wind blowing from the north | Light breeze (3 m/s) (11 km/h) (7 miles/hour) (6 knots) (2 Bft) | Sky obscured by fog and/or other meteorological phenomena. Sky obscured by fog and/or other meteorological phenomena. Sky obscured by fog and/or other meteorological phenomena. | Rain, not freezing, continuous, heavy at time of observation. | Rain. | Cloud covering more than 1/2 of the sky throughout the appropriate period. | Sky obscured by fog and/or other meteorological phenomena. Sky obscured by fog and/or other meteorological phenomena. Sky obscured by fog and/or other meteorological phenomena. | Less than 50 Less than 50 | 14.0 8.7 | 4.4 40 | |||||||||||||||
12 | 9.1 48 | 721.9 28.42 962.45 962.45 | 756.2 29.77 1008.18 1008.18 | 0.4 0.02 0.53 0.53 | 73 | Wind blowing from the west | Light air (1 m/s) (4 km/h) (2 mph) (2 knots) (1 Bft) | 90 or more, but not 100% 9/10 or more, but not 10/10 7 oktas or more, but not 8 oktas | Cumulonimbus calvus, with or without Cumulus, Stratocumulus or Stratus. | 40%. 4/10. 3 oktas | 300-600 984-1968 | Altocumulus cumulogenitus (or cumulonimbogenitus). | 70.0 43.5 | 4.5 40 | |||||||||||||||
09 | 4.6 40 | 721.5 28.41 961.92 961.92 | 756.4 29.78 1008.45 1008.45 | 95 | Wind blowing from the south | Light air (1 m/s) (4 km/h) (2 mph) (2 knots) (1 Bft) | 90 or more, but not 100% 9/10 or more, but not 10/10 7 oktas or more, but not 8 oktas | Cumulonimbus calvus, with or without Cumulus, Stratocumulus or Stratus. | 40%. 4/10. 3 oktas | 300-600 984-1968 | Altocumulus cumulogenitus (or cumulonimbogenitus). | Cirrus (often in bands) and Cirrostratus, or Cirrostratus alone, progressively invading the sky; they generally thicken as a whole; the continuous veil extends more than 45 degrees above the horizon, without the sky being totally covered. | 70.0 43.5 | 3.8 39 | Trace of precipitation Trace of precipitation | 15 | |||||||||||||