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HUASNA RIVER - ARROYO GRANDE (HSAC1)
Latitude:
35.08º N
Longitude:
120.37º W
Elevation:
1000 Feet
Location: San Luis Obispo County in CA
River Group: Southern California
Issuance Time: Jan 11 2026 at 7:59 AM PST
Please Note:Ensemble forecasts produced by CNRFC only consider meteorological uncertainty and do not account for hydrologic uncertainty.
10-Day Accumulated Volume Plot
Tabular 10-Day Streamflow Volume Accumulation (1000s of Acre-Feet)
Data Updated: Jan 11 2026 at 8:23 AM PST
ProbJan
12
Jan
13
Jan
14
Jan
15
Jan
16
10%
(Max)
0.00.10.10.10.2
25%
 
0.00.10.10.10.2
50%
(Prob)
0.00.10.10.10.2
75%
 
0.00.10.10.10.2
90%
(Min)
0.00.10.10.10.2
RFC
FCST
0.00.10.10.10.2
ProbJan
17
Jan
18
Jan
19
Jan
20
Jan
21
10%
(Max)
0.20.30.30.30.4
25%
 
0.20.30.30.30.4
50%
(Prob)
0.20.30.30.30.4
75%
 
0.20.30.30.30.4
90%
(Min)
0.20.30.30.30.4

Location Photographs

ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ342)
Today: Partly cloudy in the morning then sunny. Highs in the upper 50s and 60s. Northeast winds 15 to 25 mph.

Tonight: Mostly clear in the evening then partly cloudy. Lows in the mid 30s to mid 40s except the mid 40s to around 50 warmer hills. Northeast winds around 15 mph.

Monday: Sunny. Highs in the 60s to around 70. Northeast winds around 15 mph.

Monday Night: Clear. Lows in the upper 30s and 40s. East winds around 15 mph.

Tuesday: Sunny. Highs in the mid 60s to mid 70s. Northeast winds around 15 mph. Gusts to 30 mph in the morning.

Tuesday Night: Clear. Lows in the 40s to around 50.

Wednesday: Sunny. Highs in the mid 60s to mid 70s.

Wednesday Night: Clear. Lows in the 40s to lower 50s.

Thursday: Sunny. Highs in the upper 60s to mid 70s.

Thursday Night: Mostly clear. Lows in the mid 40s to mid 50s.

Friday: Sunny. Highs in the upper 60s to mid 70s.

Friday Night: Mostly clear in the evening then partly cloudy. Lows in the mid 40s to mid 50s.

Saturday: Partly cloudy. Highs in the mid 60s to mid 70s.