Rio Vista, CA - heart of the Northern California Delta. average highs in end of August run 95-100 F (37-37.8 C). Average daily winds run west to eat at 10-15 mph (23.5-24.5 kph). The offshore flow from the San Francisco Bay acts to control the microclimate, preventing overheating. Yesterday's high temp at Rio Vista Airport - 114 F (45.6 C), 33 % humidity, winds nil.Friday was 108 F (42.3 C), 30% humidity, winds nil. Today is forecast 105 F (40.6 C) 39 % humidity, winds nil. These kind of temps are normal for northen central valley climates,(North of Williams/oOroville area) but running a good 10-15 degrees above normal for this area, and the loss of the offshore convection currents is making the humidity worse. It's tough on my dogs, and my feet. We're sheltering in place under misting systems in the afternoons to stay as cool as possible. Sure be glad when the massive high pressure ridge finally comes loose over the Bay and Delta. Even San Francisco hit 95 F(35C) yesterday, and that is one hot temp in a town where the August average high is 65 F (18.4 C).