A room temperature curable organopolysiloxane composition comprising: 100 parts by mass of an organopolysiloxane represented by the following general formula: X-(SiR 1 2 O) m -SiR 1 2 -X; wherein each R 1 is the same or different monovalent hydrocarbon group lacking an aliphatic unsaturated bond, each X is an alkoxysilyl-containing group selected from the group consisting of a group represented by the following general formula: -R 3 -SiR 1 a (OR 2) (3-a), a group represented by the following general formula: -R 3 -(SiR 1 2 O) n -SiR 1 2 -R 3 -SiR 1 a (OR 2) (3-a), and a group represented by the following general formula: -R 3 -(SiR 1 2 O) n -SiR 1 b -[OSiR 1 2 -R 3 -SiR 1 a (OR 2) (3-a)] 1(3-b), wherein each R 1 is as described above, R 2 is an alkyl group, each R 3 is the same or different alkylene group, "a" is 0, 1 or 2, "b" is 0 or 1, "n" is an integer of from 1 to 20, and "m" is an integer of from 50 to 1000; 50 to 200 parts by mass of an organopolysiloxane resin having a content of OZ measured as disclosed in the description in a range of from 30 mol% to 54 mol%, wherein each Z is H or an alkyl group such that OZ represents a silanol group and/or a silicon atom-bonded alkoxy group, and represented by the following average unit formula: (R 4 3 SiO 1/2) c (R 4 2 SiO 2/2) d (R 4 SiO 3/2) e; wherein each R 4 is the same or different monovalent hydrocarbon group, and "c", "d", and "e" are numbers satisfied by the following conditions: 0 ≤ c < 0.1, 0.3 ≤ d ≤ 0.6, 0.4 ≤ e ≤ 0.7, and c + d + e = 1; 0.5 to 20 parts by mass of an alkoxysilane represented by the following general formula: R 5 x Si(OR 6) (4-x); wherein R 5 is a monovalent hydrocarbon group, R 6 is an alkyl group, and "x" is an integer of from 0 to 2; and 0.1 to 20 parts by mass of a condensation-reaction catalyst. 100 parts by mass of an organopolysiloxane represented by the following general formula: X-(SiR 1 2 O) m -SiR 1 2 -X; wherein each R 1 is the same or different monovalent hydrocarbon group lacking an aliphatic unsaturated bond, each X is an alkoxysilyl-containing group selected from the group consisting of a group represented by the following general formula: -R 3 -SiR 1 a (OR 2) (3-a), a group represented by the following general formula: -R 3 -(SiR 1 2 O) n -SiR 1 2 -R 3 -SiR 1 a (OR 2) (3-a), and a group represented by the following general formula: -R 3 -(SiR 1 2 O) n -SiR 1 b -[OSiR 1 2 -R 3 -SiR 1 a (OR 2) (3-a)] 1(3-b), wherein each R 1 is as described above, R 2 is an alkyl group, each R 3 is the same or different alkylene group, "a" is 0, 1 or 2, "b" is 0 or 1, "n" is an integer of from 1 to 20, and "m" is an integer of from 50 to 1000; 50 to 200 parts by mass of an organopolysiloxane resin having a content of OZ measured as disclosed in the description in a range of from 30 mol% to 54 mol%, wherein each Z is H or an alkyl group such that OZ represents a silanol group and/or a silicon atom-bonded alkoxy group, and represented by the following average unit formula: (R 4 3 SiO 1/2) c (R 4 2 SiO 2/2) d (R 4 SiO 3/2) e; wherein each R 4 is the same or different monovalent hydrocarbon group, and "c", "d", and "e" are numbers satisfied by the following conditions: 0 ≤ c < 0.1, 0.3 ≤ d ≤ 0.6, 0.4 ≤ e ≤ 0.7, and c + d + e = 1; 0.5 to 20 parts by mass of an alkoxysilane represented by the following general formula: R 5 x Si(OR 6) (4-x); wherein R 5 is a monovalent hydrocarbon group, R 6 is an alkyl group, and "x" is an integer of from 0 to 2; and 0.1 to 20 parts by mass of a condensation-reaction catalyst.