As of 00:04 PDT

Weather in Halcyon, CA

64°

Halcyon, Saturday, 10 October, 00:04

Overcast. Feels like 64°. High 81°, low 60°.

Pressure29.74 inHg

Wind0 mph N

Humidity86%

Visibility—

Dew point60°

See detailed hourly forecast

Monthly outlook for Halcyon, CA: average high 76.7°, average low 58.8°. That is 3.1° above the climate normal for October. Precipitation is expected on 1 day (about 0.3 inches), against a normal of 1 days and 0.3 inches. The warmest day looks like 17 October (83.8°), the coolest 14 October (47.6°).

76.7°/58.8°

Average high / low

+3.1°

Above normal

1 / 1

Wet days / normal

0.3 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
10 October – 19 October	75.6°	71.4°	+2.3°
20 October – 29 October	78.5°	70.1°	+4.7°
30 October – 8 November	at normal	68.3°	—

October records over 66 years

102.7°24 October 2017All-time high

41.9°29 October 2019All-time low

Climate normals and records are computed from the nearest reference point — Grover Beach (2 mi).

Sun, 1170° / 58°

0.03

70 °

Halcyon, Sunday, 11 October

Light rain. High 70°, low 58°.

Pressure29.56 inHg

Wind9.6 mph W

Humidity54%

Visibility6.2 mi

Dew point51°

Mon, 1266° / 53°

0.26

66 °

Halcyon, Monday, 12 October

Rain. High 66°, low 53°.

Pressure29.85 inHg

Wind7 mph S

Humidity57%

Visibility6.2 mi

Dew point49°

Tue, 1369° / 48°

69 °

Halcyon, Tuesday, 13 October

Clear. High 69°, low 48°.

Pressure30.00 inHg

Wind6.2 mph W

Humidity56%

Visibility6.2 mi

Dew point51°

Wed, 1481° / 48°

81 °

Halcyon, Wednesday, 14 October

Clear. High 81°, low 48°.

Pressure30.12 inHg

Wind11.4 mph NW

Humidity29%

Visibility—

Dew point37°

Thu, 1581° / 50°

81 °

Halcyon, Thursday, 15 October

Clear. High 81°, low 50°.

Pressure30.06 inHg

Wind10.4 mph W

Humidity27%

Visibility—

Dew point38°

Fri, 1682° / 66°

82 °

Halcyon, Friday, 16 October

Clear. High 82°, low 66°.

Pressure30.03 inHg

Wind10.9 mph W

Humidity26%

Visibility—

Dew point42°

Sat, 1784° / 66°

84 °

Halcyon, Saturday, 17 October

Clear. High 84°, low 66°.

Pressure29.97 inHg

Wind9.2 mph W

Humidity23%

Visibility—

Dew point40°

Sun, 1871° / 59°

71 °

Halcyon, Sunday, 18 October

Overcast. High 71°, low 59°.

Pressure29.94 inHg

Wind11 mph W

Humidity62%

Visibility—

Dew point56°

Mon, 1971° / 58°

71 °

Halcyon, Monday, 19 October

Overcast. High 71°, low 58°.

Pressure29.94 inHg

Wind10.6 mph W

Humidity47%

Visibility—

Dew point48°

Tue, 2071° / 59°

71 °

Halcyon, Tuesday, 20 October

Overcast. High 71°, low 59°.

Pressure29.97 inHg

Wind11.7 mph W

Humidity40%

Visibility—

Dew point44°

Wed, 2178° / 61°

78 °

Halcyon, Wednesday, 21 October

Clear. High 78°, low 61°.

Pressure30.00 inHg

Wind8.9 mph W

Humidity27%

Visibility—

Dew point38°

Thu, 2279° / 64°

79 °

Halcyon, Thursday, 22 October

Overcast. High 79°, low 64°.

Pressure29.94 inHg

Wind13.4 mph NW

Humidity28%

Visibility—

Dew point41°

Fri, 2379° / 62°

79 °

Halcyon, Friday, 23 October

Clear. High 79°, low 62°.

Pressure29.94 inHg

Wind9.2 mph NE

Humidity20%

Visibility—

Dew point30°

Sat, 2481° / 63°

81 °

Halcyon, Saturday, 24 October

Clear. High 81°, low 63°.

Pressure30.00 inHg

Wind9 mph W

Humidity25%

Visibility—

Dew point39°

Sun, 2583° / 66°

83 °

Halcyon, Sunday, 25 October

Clear. High 83°, low 66°.

Pressure30.03 inHg

Wind7 mph NE

Humidity20%

Visibility—

Dew point36°

From day 17 onward the outlook is built from 60-year climate statistics

Mon, 2670° / 55°

0.06

70 °

Halcyon, Monday, 26 October

Climate normal for this date — 60-year average.

Average high70°

Average low55°

Average precipitation0.06 in

Chance of precipitation8%

Record high87° (1983)

Record low45° (2022)

Tue, 2769° / 54°

0.01

69 °

Halcyon, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high69°

Average low54°

Average precipitation0.01 in

Chance of precipitation5%

Record high84° (2003)

Record low46° (2022)

Wed, 2869° / 54°

0.04

69 °

Halcyon, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high69°

Average low54°

Average precipitation0.04 in

Chance of precipitation8%

Record high86° (2021)

Record low46° (2004)

Thu, 2968° / 53°

0.04

68 °

Halcyon, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high68°

Average low53°

Average precipitation0.04 in

Chance of precipitation12%

Record high83° (2025)

Record low42° (2019)

Fri, 3068° / 53°

0.07

68 °

Halcyon, Friday, 30 October

Climate normal for this date — 60-year average.

Average high68°

Average low53°

Average precipitation0.07 in

Chance of precipitation13%

Record high85° (1966)

Record low42° (1971)

Sat, 3169° / 53°

0.02

69 °

Halcyon, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high69°

Average low53°

Average precipitation0.02 in

Chance of precipitation8%

Record high83° (1962)

Record low42° (2024)

Sun, 0170° / 54°

0.02

70 °

Halcyon, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high70°

Average low54°

Average precipitation0.02 in

Chance of precipitation10%

Record high85° (1966)

Record low45° (2003)

Mon, 0270° / 53°

0.02

70 °

Halcyon, Monday, 2 November

Climate normal for this date — 60-year average.

Average high70°

Average low53°

Average precipitation0.02 in

Chance of precipitation5%

Record high87° (1997)

Record low46° (2023)

Tue, 0369° / 53°

0.01

69 °

Halcyon, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high69°

Average low53°

Average precipitation0.01 in

Chance of precipitation7%

Record high85° (2018)

Record low44° (2022)

Wed, 0469° / 53°

0.02

69 °

Halcyon, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high69°

Average low53°

Average precipitation0.02 in

Chance of precipitation12%

Record high87° (2020)

Record low43° (2024)

Thu, 0568° / 53°

0.03

68 °

Halcyon, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high68°

Average low53°

Average precipitation0.03 in

Chance of precipitation8%

Record high91° (2020)

Record low45° (1973)

Fri, 0667° / 53°

0.02

67 °

Halcyon, Friday, 6 November

Climate normal for this date — 60-year average.

Average high67°

Average low53°

Average precipitation0.02 in

Chance of precipitation7%

Record high81° (1991)

Record low45° (2024)

Sat, 0767° / 53°

0.06

67 °

Halcyon, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high67°

Average low53°

Average precipitation0.06 in

Chance of precipitation17%

Record high80° (2006)

Record low44° (2024)

Sun, 0866° / 52°

0.09

66 °

Halcyon, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high66°

Average low52°

Average precipitation0.09 in

Chance of precipitation18%

Record high80° (2025)

Record low43° (2024)

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Halcyon, CA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Halcyon, CA since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.