Insolation, net radiation, and various oceanic and atmospheric variables were measured at sites 13 and about 120 km off the coast of Oregon in July and August 1973. A total often 24‐hour stations were occupied. The daily mean net solar radiation ranged from 0.10 to 0.40 cal cm−2 min−1, and large spatial variations of radiation in this upwelling region were present. The daily mean values were not closely related to the proportion of sky covered with clouds, but a mean from all the stations was in reasonable agreement with one cloud formula. The net long‐wave radiation varied from about −0.01 cal cm−2 min−1 under overcast skies to −0.10 cal cm−2 min−1 under clear skies. Daily mean values appear closely related to cloud amount, and a cloud factor of 1 ‐ 0.9C, as suggested by previous workers, seems appropriate for stratocumulus clouds. The measured clear‐sky net long‐wave radiation is appreciably less than that given by numerous widely used formulas but is supported by other observations and by a formula derived by Anderson.