The National Weather Service (NWS) provides three month temperature and precipitation outlooks several months in the future. This site may be useful in understanding what the NWS currently predicts will occur in the coming months relative to the normal, or average, temperature and rainfall.
National Weather Service 3-Month Outlooks (Single Month)
National Weather Service 3-Month Outlooks (Multi-Month)
On that NWS pages, the upper map(s) is(are) for temperature and the lower map(s) for precipitation. Clicking a map opens it in a larger format to allow a closer look.
The three letters before the year (eg. ASO) are the letters for the months.
ASO = August September October
SON = September October November
OND = October November December
etc. . . .
Note: The Contra Costa County Flood Control & Water Conservation District does not provide weather forecasts or predictions. Some NWS pages are experimental and their web addresses and content change from time to time.