diff --git a/CMakeLists.txt b/CMakeLists.txt
index b0743bdf1b..614d4524a1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -299,6 +299,7 @@ set(LIBOPENMC_FORTRAN_SRC
   src/angle_distribution.F90
   src/angleenergy_header.F90
   src/bank_header.F90
+  src/capi.F90
   src/cmfd_data.F90
   src/cmfd_execute.F90
   src/cmfd_header.F90
diff --git a/openmc/libopenmc.py b/openmc/libopenmc.py
index f95f72aac6..031c54564b 100644
--- a/openmc/libopenmc.py
+++ b/openmc/libopenmc.py
@@ -24,6 +24,9 @@ class _OpenMCLibrary(object):
             c_int, POINTER(POINTER(c_double)), ndpointer(
                 np.intc, shape=(3,))]
         self._dll.openmc_tally_results.restype = None
+        self._dll.openmc_cell_set_temperature.argtypes = [
+            c_int, c_double]
+        self._dll.openmc_cell_set_temperature.restype = c_int
 
     def init(self, intracomm=None):
         """Initialize OpenMC
@@ -87,6 +90,10 @@ class _OpenMCLibrary(object):
         else:
             return None
 
+    def cell_set_temperature(self, cell_id, temperature):
+        """Set the temperature of a cell"""
+        return self._dll.openmc_cell_set_temperature(cell_id, temperature)
+
     def __getattr__(self, key):
         # Fall-back for other functions that may be available from library
         try:
diff --git a/src/capi.F90 b/src/capi.F90
new file mode 100644
index 0000000000..0c7a54c5bf
--- /dev/null
+++ b/src/capi.F90
@@ -0,0 +1,65 @@
+module openmc_capi
+
+  use, intrinsic :: ISO_C_BINDING
+
+  use constants, only: K_BOLTZMANN
+  use eigenvalue, only: k_sum
+  use global
+
+  private
+  public :: openmc_cell_set_temperature
+  public :: openmc_reset
+
+contains
+
+!===============================================================================
+! OPENMC_CELL_SET_TEMPERATURE sets the temperature of a cell
+!===============================================================================
+
+  function openmc_cell_set_temperature(id, T) result(err) bind(C)
+    integer(C_INT), value, intent(in) :: id  ! id of cell
+    real(C_DOUBLE), value, intent(in) :: T
+    integer(C_INT) :: err
+
+    integer :: i
+
+    err = -1
+    if (allocated(cells)) then
+      if (cell_dict % has_key(id)) then
+        i = cell_dict % get_key(id)
+        associate (c => cells(i))
+          if (allocated(c % sqrtkT)) then
+            c % sqrtkT(:) = sqrt(K_BOLTZMANN * T)
+            err = 0
+          end if
+        end associate
+      end if
+    end if
+  end function openmc_cell_set_temperature
+
+!===============================================================================
+! OPENMC_RESET resets all tallies
+!===============================================================================
+
+  subroutine openmc_reset() bind(C)
+    integer :: i
+
+    do i = 1, size(tallies)
+      tallies(i) % n_realizations = 0
+      if (allocated(tallies(i) % results)) then
+        tallies(i) % results(:, :, :) = ZERO
+      end if
+    end do
+
+    n_realizations = 0
+    if (allocated(global_tallies)) then
+      global_tallies(:, :) = ZERO
+    end if
+    k_col_abs = ZERO
+    k_col_tra = ZERO
+    k_abs_tra = ZERO
+    k_sum(:) = ZERO
+
+  end subroutine openmc_reset
+
+end module openmc_capi
diff --git a/src/simulation.F90 b/src/simulation.F90
index 5423037508..8c4016f967 100644
--- a/src/simulation.F90
+++ b/src/simulation.F90
@@ -27,7 +27,7 @@ module simulation
 
   implicit none
   private
-  public :: openmc_run, openmc_reset
+  public :: openmc_run
 
 contains
 
@@ -423,29 +423,4 @@ contains
 
   end subroutine reduce_overlap_count
 
-!===============================================================================
-! OPENMC_RESET resets all tallies
-!===============================================================================
-
-  subroutine openmc_reset() bind(C)
-    integer :: i
-
-    do i = 1, size(tallies)
-      tallies(i) % n_realizations = 0
-      if (allocated(tallies(i) % results)) then
-        tallies(i) % results(:, :, :) = ZERO
-      end if
-    end do
-
-    n_realizations = 0
-    if (allocated(global_tallies)) then
-      global_tallies(:, :) = ZERO
-    end if
-    k_col_abs = ZERO
-    k_col_tra = ZERO
-    k_abs_tra = ZERO
-    k_sum(:) = ZERO
-
-  end subroutine openmc_reset
-
 end module simulation