As of 04:14 PDT

Weather in Prosser, WA

62°

Prosser, Sunday, 9 August, 04:14

Partly cloudy. Feels like 61°. High 90°, low 62°.

Pressure29.91 inHg

Wind4.2 mph NW

Humidity65%

Visibility6.2 mi

Dew point49°

See detailed hourly forecast

Monthly outlook for Prosser, WA: average high 88.2°, average low 62.4°. That is 1° below the climate normal for August. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 1 days and 0.1 inches. The warmest day looks like 15 August (99.3°), the coolest 18 August (56.4°).

88.2°/62.4°

Average high / low

−1°

Below normal

1 / 1

Wet days / normal

0.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	90.9°	91.5°	-0.3°
19 August – 28 August	83.7°	87.5°	-2.1°
29 August – 7 September	at normal	85.2°	—

August records over 66 years

111.2°4 August 1961All-time high

48.6°22 August 1960All-time low

Mon, 1094° / 60°

94 °

Prosser, Monday, 10 August

Clear. High 94°, low 60°.

Pressure29.88 inHg

Wind4.5 mph SW

Humidity23%

Visibility6.2 mi

Dew point42°

Tue, 1194° / 61°

94 °

Prosser, Tuesday, 11 August

Clear. High 94°, low 61°.

Pressure29.94 inHg

Wind2 mph SW

Humidity23%

Visibility6.2 mi

Dew point43°

Wed, 1293° / 64°

93 °

Prosser, Wednesday, 12 August

Clear. High 93°, low 64°.

Pressure29.83 inHg

Wind3.8 mph W

Humidity25%

Visibility6.2 mi

Dew point45°

Thu, 1393° / 64°

93 °

Prosser, Thursday, 13 August

Clear. High 93°, low 64°.

Pressure29.74 inHg

Wind5.5 mph NW

Humidity20%

Visibility—

Dew point41°

Fri, 1495° / 66°

95 °

Prosser, Friday, 14 August

Clear. High 95°, low 66°.

Pressure29.80 inHg

Wind5.8 mph S

Humidity17%

Visibility—

Dew point40°

Sat, 1599° / 65°

99 °

Prosser, Saturday, 15 August

Partly cloudy. High 99°, low 65°.

Pressure29.83 inHg

Wind8.4 mph SW

Humidity13%

Visibility—

Dew point35°

Sun, 1693° / 67°

93 °

Prosser, Sunday, 16 August

Overcast. High 93°, low 67°.

Pressure29.83 inHg

Wind15 mph W

Humidity13%

Visibility—

Dew point33°

Mon, 1773° / 60°

0.08

73 °

Prosser, Monday, 17 August

Light rain. High 73°, low 60°.

Pressure30.00 inHg

Wind12.6 mph NW

Humidity69%

Visibility—

Dew point57°

Tue, 1884° / 56°

84 °

Prosser, Tuesday, 18 August

Partly cloudy. High 84°, low 56°.

Pressure29.88 inHg

Wind8.8 mph SW

Humidity29%

Visibility—

Dew point45°

Wed, 1988° / 61°

88 °

Prosser, Wednesday, 19 August

Partly cloudy. High 88°, low 61°.

Pressure29.88 inHg

Wind8.3 mph S

Humidity27%

Visibility—

Dew point47°

Thu, 2089° / 68°

0.02

89 °

Prosser, Thursday, 20 August

Light rain. High 89°, low 68°.

Pressure29.83 inHg

Wind7.8 mph NW

Humidity30%

Visibility—

Dew point50°

Fri, 2187° / 66°

0.02

87 °

Prosser, Friday, 21 August

Light rain. High 87°, low 66°.

Pressure29.80 inHg

Wind15.5 mph SW

Humidity21%

Visibility—

Dew point39°

Sat, 2281° / 63°

81 °

Prosser, Saturday, 22 August

Light rain. High 81°, low 63°.

Pressure29.85 inHg

Wind13.6 mph SW

Humidity29%

Visibility—

Dew point44°

Sun, 2384° / 57°

84 °

Prosser, Sunday, 23 August

Partly cloudy. High 84°, low 57°.

Pressure29.94 inHg

Wind7.7 mph S

Humidity28%

Visibility—

Dew point42°

Mon, 2473° / 60°

73 °

Prosser, Monday, 24 August

Overcast. High 73°, low 60°.

Pressure29.80 inHg

Wind8.2 mph NW

Humidity39%

Visibility—

Dew point45°

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

Tue, 2586° / 62°

0.02

86 °

Prosser, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high86°

Average low62°

Average precipitation0.02 in

Chance of precipitation10%

Record high103° (1996)

Record low51° (1960)

Wed, 2687° / 61°

87 °

Prosser, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high87°

Average low61°

Average precipitation0 in

Chance of precipitation2%

Record high103° (1996)

Record low51° (1993)

Thu, 2787° / 62°

87 °

Prosser, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high87°

Average low62°

Average precipitation0 in

Chance of precipitation7%

Record high101° (1986)

Record low51° (1960)

Fri, 2887° / 62°

87 °

Prosser, Friday, 28 August

Climate normal for this date — 60-year average.

Average high87°

Average low62°

Average precipitation0 in

Chance of precipitation3%

Record high101° (2023)

Record low51° (1960)

Sat, 2988° / 63°

0.01

88 °

Prosser, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high88°

Average low63°

Average precipitation0.01 in

Chance of precipitation3%

Record high100° (2017)

Record low50° (1965)

Sun, 3086° / 62°

0.02

86 °

Prosser, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high86°

Average low62°

Average precipitation0.02 in

Chance of precipitation8%

Record high101° (2007)

Record low50° (1966)

Mon, 3185° / 61°

0.01

85 °

Prosser, Monday, 31 August

Climate normal for this date — 60-year average.

Average high85°

Average low61°

Average precipitation0.01 in

Chance of precipitation3%

Record high102° (2022)

Record low49° (1964)

Tue, 0185° / 60°

0.01

85 °

Prosser, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high85°

Average low60°

Average precipitation0.01 in

Chance of precipitation8%

Record high103° (1987)

Record low49° (1975)

Wed, 0285° / 60°

85 °

Prosser, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high85°

Average low60°

Average precipitation0 in

Chance of precipitation7%

Record high101° (2022)

Record low49° (1975)

Thu, 0385° / 60°

0.01

85 °

Prosser, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high85°

Average low60°

Average precipitation0.01 in

Chance of precipitation3%

Record high104° (2025)

Record low49° (1964)

Fri, 0486° / 60°

86 °

Prosser, Friday, 4 September

Climate normal for this date — 60-year average.

Average high86°

Average low60°

Average precipitation0 in

Chance of precipitation2%

Record high103° (2025)

Record low51° (1969)

Sat, 0585° / 60°

85 °

Prosser, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high85°

Average low60°

Average precipitation0 in

Chance of precipitation3%

Record high102° (1988)

Record low50° (1969)

Sun, 0684° / 59°

0.02

84 °

Prosser, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high84°

Average low59°

Average precipitation0.02 in

Chance of precipitation12%

Record high100° (2024)

Record low47° (1960)

Mon, 0784° / 59°

84 °

Prosser, Monday, 7 September

Climate normal for this date — 60-year average.

Average high84°

Average low59°

Average precipitation0 in

Chance of precipitation3%

Record high100° (2024)

Record low48° (1960)

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 Prosser, WA 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 Prosser, WA 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.