Increasing wind shear created a hostile environment for the cyclone and it failed to intensify beyond minimal tropical storm intensity as its convection was stripped far to the northeast.

[1] With favorable environmental conditions, including high sea surface temperatures, sufficient atmospheric moisture and instability, steady development was anticipated.

[5][6] The low moved north-northwest in response to a break in the eastern Atlantic subtropical ridge created by an upper-level trough.

In light of the increased organization, the NHC classified the system as Tropical Depression Ten at 12:00 UTC with the cyclone centered 470 km (290 mi) east-northeast of the Cabo Verde Islands.

A burst of convection on the cyclone's eastern side signaled the depression's intensification into a tropical storm late on September 23.

[1] Modest water warmth and moderate wind shear produced by the trough north of the cyclone gave Hermine limited time to intensify before moving into an increasingly hostile environment on September 24.

[1][11][12] Sputtering convection remained during this time before the cyclone collapsed and degenerated into a remnant low around 00:00 UTC on September 25; it was situated about 760 km (470 mi) west-southwest of the Canary Islands.

[1] The cyclone's formation northeast of Cabo Verde is unusual, with only a handful of recorded instances within the Atlantic hurricane database dating back to 1851.

[13] Hermine's particular track and effect in the Canary Islands is regarded as one without precedent according to the Institute of Oceanography and Global Change and the State Meteorological Agency.

Various media outlets attributed several incidents to the passage of Hermine;[17] however, in the National Hurricane Center's post-storm report, no mention is made of these.

[17] In anticipation of heavy rains, emergency services across the Canary Islands activated contingency plans to ensure public safety.

The highest totals were observed on La Palma, where a maximum of 530 mm (20.87 in) fell in San José within the Breña Baja municipality.

[1] A record-breaking 345 mm (13.6 in) fell in a single day; this constituted the greatest single-day rainfall event in the Canary Islands.

[34] The majority of the power outages occurred in Las Palmas, San Bartolomé de Tirajana, and Telde on Gran Canaria.

[37] A kayaker was fined for illegally going outdoors during the storm in Santa Lucía de Tirajana and several hikers and scuba divers were ordered to return home.

[28] The partial closure of the GC-1 led to significant traffic jams and repairs would not be completed for five months and would cost 1.2 million euros.

[41] Some residents in less affluent parts of Tenerife expressed ire with poor responses or inaccurate times given for restoration from Endesa.

The lack of strong winds accompanying the storm mitigated the majority of crop damage, with only bananas suffering; however, flooding delayed harvests.

[44] Dams and reservoirs on Gran Canaria saw an influx of 2,700,000 litres (710,000 US gal) of water, ensuring agricultural stability for the next two years.