As bangalore weather lover I would you suggest you to go less populated places and please don't go Nandi Hill on weekends, too much traffic is there.
Yelagiri
Horshley Hills
Coorg
Ooty
Hi Siddharth, You can visit Hampi, Coorg, Yercaud, Vellore, Chikmaglur from Bangalore, for more options go through this article on getaways from Bangalore
Perched at an altitude of 3500 ft above sea level, Yelagiri is one of the best hill stations in Tamil Nadu. It is located at just 178 km from Bangalore. It is one of the popular trekking and paragliding spots in India. The tranquil backdrop, balmy climate, and lofty peaks allure hundreds of tourists every year. The ideal time to visit Yelagiri is between November and February. For accommodations, there are many resorts in Yelagiri where you can stay at a decent price. Places to visit: The main attraction spots are Swamimalai Hills, Jalagamaparai Falls, Velavan Temple, Nature Park, and Punganoor Lake. Things to do: Indulge in adventure activities like Trekking, Paragliding, Rock Climbing, Zorbing, and Zipline. Accommodations-https://www.ulohotels.com/yelagiri-hotels-and-resorts
Places to Visit Near Bangalore within 300 kms
Doddamakali - You can visit here to enjoy the boating and the coracle rides.
Ranganathittu Bird Sanctuary Sivasamudram Waterfalls
Regards Shanu - https://www.makeourmoments.com/tour/munnar-day-tour/