Try changing the last OID digit to a 5, and add a .1.  Performing an snmpwalk on my N3xxx running 6.2 firmware, I see  C:\SnmpWalk>snmpwalk -v2c -c public 192.168.1.1  .1.3.6.1.4.1.674.10895.5000.2.6132.1.1.43.1.8.1.5.1 iso.3.6.1.4.1.674.10895.5000.2.6132.1.1.43.1.8.1.5.1.0 = INTEGER: 35 iso.3.6.1.4.1.674.10895.5000.2.6132.1.1.43.1.8.1.5.1.1 = INTEGER: 33 which are the same temperatures displayed in the web UI OpenManage Switch Administrator, under System > General > Health > Temperature Sensors.   -B
Is it possible to query for system temperature (what's seen in sh system temp) over snmp? 
N2000 Temperature SNMP