'arduous weather' is correct and usable in written English.
You can use it to describe a weather period that involves difficult or challenging conditions. For example: The arduous weather in the mountains made the hike particularly challenging.
On a recent afternoon, Lizinke Kruger, an 18-year-old tourist and "Girls" fan from Cape Town, South Africa, had braved the miserable, rainy weather and the arduous trip to Greenpoint via the much-maligned G train, all to catch a glimpse of the fictional Hannah's workplace.
Alceste required some repairs after an arduous journey in less than clement weather so Maxwell wasted no time in petitioning the viceroy of Canton for permission to travel up the Tigris to a secure anchorage, unaware that Amherst's mission had been less than successful.
The conditions were arduous.
Halkett had long been interested in the difficulties of travelling in the Canadian Arctic, and the problems involved in designing boats light enough to be carried over arduous terrain, but robust enough to be used in extreme weather conditions.
The few people from the UK who make the long and arduous journey to Alaska usually come between May and September, when the weather is mild and the snow has all but disappeared save for the ice-bound mountains and the 100,000 or so glaciers that carve up this most spectacularly pristine corner of the United States.
MeeTherethe British Arms Dealer Who Sold Missiles for North Korea.
Depending on the day, time, weather, the severity of one's offense or one's prominence, they can be among the most arduous and downright irritating steps a person can take.
Second, clinical trials are arduous.
