We always liked South Bay, because it is mostly sunny, the ocean layer is kept away by the tall Skyline ridge, and if some clouds spill into the valley, sun will burn it off by 11AM. When we lived in San Carlos, just south of 92, and I worked in South San Francisco, I had to deal with the worst weather a bicyclist (or a runner) who works regular hours can imagine. Foggy and cold in the morning. I tried to go running at the Belmont XC course, but quickly got tired by the damp cold mornings with no visibility. Bike commuting to the South City was challenging, too: the sunny hours of the day were spent inside the building and as soon as the fog started to blow down the hill in San Bruno, I climbed up steep hill with freezing wind trying to flush me back down to the valley. At least, the ride was downwind along the Skyline.
I used to ignore the East Bay somewhat (except for road rides to Mt. Hamilton or Mt. Diablo), I never paid much attention to the weather patterns there. Being in Pleasanton now for close to 6 weeks, I realized that even here, there can be a strong daily pattern: The Pleasanton ridge is a barrier to the fog, keeping the town of Pleasanton sunny, but pleasantly cool overnight. The I-580 gap lets lots of fog in and San Ramon and Mt. Diablo are often under a thick marine layer. When this pattern is strong, it is comfortable in town while the ridge is very windy and cold. This was the case for a trail run two weeks ago, when the cold wind forced us to wear headbands and vests.
But in many protected valleys, it was hot, combined with the very steep terrain, it was difficult to stay cool.
Saturday forecast called for increasing temperatures, reaching 97 on Sunday and 99 by Monday, meaning the onshore flow was weakening. I picked the cooler of the two weekend day for a run at the Sunol Regional Wilderness. This is a beautiful park, with quite diverse areas. The canyon is shaded by trees, and there is even a rocky gorge aptly named Little Yosemite.
I don't know how little water flows in the Yosemite Falls this summer, but Little Yosemite had little of it. There were some kids splashing in a pool upstream, and enough water to pour on my head and back to cool of.
A 1.7 mile steep climb on Cerro Este was next. First I tried jogging, then fast walking but soon, I was walking and slowly. The grade was super steep and surface loose. This trail is open to bikes but I did not see any. No wonder, I think it would be very difficult to maintain traction uphill or downhill, even on a 29er. Trails like this could be perhaps ridden on a fat bike, if one had the strength to pedal the 35 lb beast up 20% grades.
Feeling quite wiped out and dehydrated after Saturday slog, Sunday was supposed to be a recovery day. I guess I feel well enough these days as to chose an active recovery method. I went to explore Pleasanton neighborhoods and bike paths. By the time I left the house, it was 97F and no wind.
We have crushed gravel paths along the irrigation canals here, one of them, Arroyo Mocho right behind our house. This one connects to the Centennial Trail and Arroyo Del Valle. Close to downtown, the Pleasanton town bike path even becomes a rocky singletrack with few switchbacks!