Where We Stand
Bloom peaked, depending on site, sometime around the week of June 2, and the valley closed out the first week of June with 406 cumulative GDD — season day 67 since April 1. This past week added 52 GDD on a high of 71F and a low of 43F, with 0.79 inches of precipitation. That rain total is notable in the context of what the next seven days show: none of it is coming back soon.
The Week Ahead
The forecast opens cool — 62F highs Monday and Tuesday, with 0.11 inches of rain expected Tuesday — then pivots sharply. Wednesday climbs to 76F, Thursday to 79F, Friday to 84F. Saturday reaches 94F, Sunday holds at 93F. That is a 32-degree swing across six days. The models are showing a late-week heat event that is not a brief anomaly; two consecutive days at or above 93F in the second week of June means the season accumulates GDD at a significantly accelerated rate through the weekend. The post-bloom period is when berry development begins and cell division is active. The cold nights this week — lows in the low-to-mid 40s behind a 71F high — reflect the diurnal variability that has defined the early season. What replaces that pattern over the weekend is a different regime entirely.
Season Context
Bud break on April 4 and bloom on June 2 give this vintage a 59-day bud-break-to-bloom interval. At 406 GDD through June 9, the season is tracking in a range that leaves meaningful room for the forecast heat to either normalize or extend the pace depending on what follows. The late-week spike will draw that cumulative number upward quickly. What matters now is whether this heat event is a transition into a sustained warm pattern or a sharp peak before the marine influence reasserts. The pattern through the end of June will answer that question.