As of 10:08 PDT

Weather in Mission Viejo, CA

78°

Mission Viejo, Sunday, 9 August, 10:08

Mostly clear. Feels like 79°. High 93°, low 71°.

Pressure29.88 inHg

Wind4 mph S

Humidity74%

Visibility6.2 mi

Dew point70°

See detailed hourly forecast

Monthly outlook for Mission Viejo, CA: average high 86°, average low 70.5°. That is 3.4° above the climate normal for August. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 0 days and 0.1 inches. The warmest day looks like 9 August (93.3°), the coolest 14 August (64.3°).

86°/70.5°

Average high / low

+3.4°

Above normal

1 / 0

Wet days / normal

0.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	83.7°	79.9°	+2.1°
19 August – 28 August	89.8°	80.4°	+5.2°
29 August – 7 September	at normal	81.8°	—

August records over 66 years

105.6°18 August 2020All-time high

55.8°1 August 2013All-time low

Mon, 1092° / 68°

92 °

Mission Viejo, Monday, 10 August

Mostly clear. High 92°, low 68°.

Pressure29.91 inHg

Wind7.9 mph SW

Humidity52%

Visibility6.2 mi

Dew point61°

Tue, 1182° / 69°

82 °

Mission Viejo, Tuesday, 11 August

Partly cloudy. High 82°, low 69°.

Pressure29.97 inHg

Wind8.3 mph SW

Humidity49%

Visibility6.2 mi

Dew point59°

Wed, 1281° / 68°

81 °

Mission Viejo, Wednesday, 12 August

Clear. High 81°, low 68°.

Pressure29.91 inHg

Wind8.6 mph SW

Humidity52%

Visibility6.2 mi

Dew point59°

Thu, 1377° / 65°

77 °

Mission Viejo, Thursday, 13 August

Partly cloudy. High 77°, low 65°.

Pressure29.91 inHg

Wind8.8 mph SW

Humidity59%

Visibility—

Dew point59°

Fri, 1479° / 64°

79 °

Mission Viejo, Friday, 14 August

Overcast. High 79°, low 64°.

Pressure29.97 inHg

Wind9.7 mph W

Humidity57%

Visibility—

Dew point57°

Sat, 1579° / 68°

79 °

Mission Viejo, Saturday, 15 August

Overcast. High 79°, low 68°.

Pressure30.00 inHg

Wind7.8 mph SW

Humidity54%

Visibility—

Dew point59°

Sun, 1681° / 70°

81 °

Mission Viejo, Sunday, 16 August

Overcast. High 81°, low 70°.

Pressure30.06 inHg

Wind11 mph W

Humidity55%

Visibility—

Dew point60°

Mon, 1785° / 69°

85 °

Mission Viejo, Monday, 17 August

Partly cloudy. High 85°, low 69°.

Pressure30.00 inHg

Wind12.2 mph W

Humidity49%

Visibility—

Dew point60°

Tue, 1888° / 71°

88 °

Mission Viejo, Tuesday, 18 August

Partly cloudy. High 88°, low 71°.

Pressure29.94 inHg

Wind11.1 mph W

Humidity47%

Visibility—

Dew point61°

Wed, 1990° / 74°

0.02

90 °

Mission Viejo, Wednesday, 19 August

Light rain. High 90°, low 74°.

Pressure29.88 inHg

Wind7.6 mph SW

Humidity44%

Visibility—

Dew point63°

Thu, 2090° / 75°

0.04

90 °

Mission Viejo, Thursday, 20 August

Light rain. High 90°, low 75°.

Pressure29.91 inHg

Wind6 mph W

Humidity57%

Visibility—

Dew point65°

Fri, 2189° / 74°

89 °

Mission Viejo, Friday, 21 August

Clear. High 89°, low 74°.

Pressure29.85 inHg

Wind8.4 mph W

Humidity45%

Visibility—

Dew point62°

Sat, 2287° / 73°

87 °

Mission Viejo, Saturday, 22 August

Overcast. High 87°, low 73°.

Pressure29.88 inHg

Wind6.7 mph SW

Humidity49%

Visibility—

Dew point63°

Sun, 2390° / 74°

90 °

Mission Viejo, Sunday, 23 August

Clear. High 90°, low 74°.

Pressure29.91 inHg

Wind8.4 mph W

Humidity47%

Visibility—

Dew point63°

Mon, 2492° / 76°

92 °

Mission Viejo, Monday, 24 August

Clear. High 92°, low 76°.

Pressure29.88 inHg

Wind8.2 mph W

Humidity42%

Visibility—

Dew point62°

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

Tue, 2581° / 65°

81 °

Mission Viejo, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high81°

Average low65°

Average precipitation0 in

Chance of precipitation0%

Record high93° (1985)

Record low58° (1978)

Wed, 2681° / 65°

81 °

Mission Viejo, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high81°

Average low65°

Average precipitation0 in

Chance of precipitation3%

Record high93° (2021)

Record low57° (1990)

Thu, 2782° / 65°

82 °

Mission Viejo, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high82°

Average low65°

Average precipitation0 in

Chance of precipitation0%

Record high95° (2020)

Record low58° (1973)

Fri, 2882° / 65°

82 °

Mission Viejo, Friday, 28 August

Climate normal for this date — 60-year average.

Average high82°

Average low65°

Average precipitation0 in

Chance of precipitation0%

Record high92° (2023)

Record low60° (1973)

Sat, 2983° / 66°

83 °

Mission Viejo, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high83°

Average low66°

Average precipitation0 in

Chance of precipitation2%

Record high93° (2023)

Record low58° (2010)

Sun, 3082° / 66°

82 °

Mission Viejo, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high82°

Average low66°

Average precipitation0 in

Chance of precipitation0%

Record high92° (1967)

Record low58° (1964)

Mon, 3181° / 65°

81 °

Mission Viejo, Monday, 31 August

Climate normal for this date — 60-year average.

Average high81°

Average low65°

Average precipitation0 in

Chance of precipitation0%

Record high104° (2017)

Record low58° (1961)

Tue, 0181° / 65°

81 °

Mission Viejo, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high81°

Average low65°

Average precipitation0 in

Chance of precipitation0%

Record high97° (2022)

Record low58° (1973)

Wed, 0282° / 65°

0.01

82 °

Mission Viejo, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high82°

Average low65°

Average precipitation0.01 in

Chance of precipitation3%

Record high95° (2017)

Record low59° (1966)

Thu, 0382° / 65°

82 °

Mission Viejo, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high82°

Average low65°

Average precipitation0 in

Chance of precipitation5%

Record high98° (1988)

Record low57° (1973)

Fri, 0483° / 66°

83 °

Mission Viejo, Friday, 4 September

Climate normal for this date — 60-year average.

Average high83°

Average low66°

Average precipitation0 in

Chance of precipitation3%

Record high109° (2022)

Record low58° (1999)

Sat, 0582° / 66°

0.01

82 °

Mission Viejo, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high82°

Average low66°

Average precipitation0.01 in

Chance of precipitation3%

Record high105° (2020)

Record low57° (1973)

Sun, 0682° / 66°

0.01

82 °

Mission Viejo, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high82°

Average low66°

Average precipitation0.01 in

Chance of precipitation2%

Record high107° (2020)

Record low58° (1970)

Mon, 0782° / 66°

82 °

Mission Viejo, Monday, 7 September

Climate normal for this date — 60-year average.

Average high82°

Average low66°

Average precipitation0 in

Chance of precipitation0%

Record high101° (2024)

Record low57° (1980)

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 Mission Viejo, 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 Mission Viejo, 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.