Monthly outlook for Bethesda, WI: average high 78.5°, average low 63°. That is 0.1° above the climate normal for August. Precipitation is expected on 4 days (about 2.7 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 20 August (91.7°), the coolest 14 August (54.7°).
78.5°/63°
Average high / low
+0.1°
Above normal
4 / 5
Wet days / normal
2.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
75.9°
78.5°
-1.4°
19 August – 28 August
83°
78.4°
+2.5°
29 August – 7 September
at normal
76.5°
—
August records over 66 years
97.5°16 August 1988All-time high
46.2°28 August 1986All-time low
Climate normals and records are computed from the nearest reference point — North Prairie (6 mi).
Mon, 1085° / 69°0.04
85 °
Bethesda, Monday, 10 August
Light rain. High 85°, low 69°.
Pressure29.91 inHg
Wind3.3 mph SW
Humidity75%
Visibility6.2 mi
Dew point70°
Tue, 1180° / 64°1.24
80 °
Bethesda, Tuesday, 11 August
Heavy rain. High 80°, low 64°.
Pressure29.83 inHg
Wind8.3 mph SE
Humidity88%
Visibility6.2 mi
Dew point67°
Wed, 1279° / 65°0
79 °
Bethesda, Wednesday, 12 August
Overcast. High 79°, low 65°.
Pressure29.85 inHg
Wind10.3 mph NW
Humidity67%
Visibility6.2 mi
Dew point66°
Thu, 1371° / 58°0
71 °
Bethesda, Thursday, 13 August
Overcast. High 71°, low 58°.
Pressure30.06 inHg
Wind6.6 mph NE
Humidity56%
Visibility—
Dew point53°
Fri, 1471° / 55°0
71 °
Bethesda, Friday, 14 August
Partly cloudy. High 71°, low 55°.
Pressure30.18 inHg
Wind8.9 mph E
Humidity62%
Visibility—
Dew point56°
Sat, 1573° / 56°0
73 °
Bethesda, Saturday, 15 August
Light rain. High 73°, low 56°.
Pressure30.24 inHg
Wind8.1 mph E
Humidity59%
Visibility—
Dew point56°
Sun, 1671° / 62°0
71 °
Bethesda, Sunday, 16 August
Overcast. High 71°, low 62°.
Pressure30.12 inHg
Wind6.3 mph S
Humidity82%
Visibility—
Dew point60°
Mon, 1776° / 61°0.05
76 °
Bethesda, Monday, 17 August
Light rain. High 76°, low 61°.
Pressure30.09 inHg
Wind8 mph E
Humidity70%
Visibility—
Dew point64°
Tue, 1876° / 58°0
76 °
Bethesda, Tuesday, 18 August
Overcast. High 76°, low 58°.
Pressure30.03 inHg
Wind6.9 mph S
Humidity60%
Visibility—
Dew point58°
Wed, 1984° / 65°0.41
84 °
Bethesda, Wednesday, 19 August
Rain. High 84°, low 65°.
Pressure29.88 inHg
Wind14.6 mph S
Humidity70%
Visibility—
Dew point68°
Thu, 2092° / 73°0
92 °
Bethesda, Thursday, 20 August
Overcast. High 92°, low 73°.
Pressure29.77 inHg
Wind7 mph NW
Humidity62%
Visibility—
Dew point73°
Fri, 2183° / 66°0
83 °
Bethesda, Friday, 21 August
Mostly clear. High 83°, low 66°.
Pressure29.94 inHg
Wind10.2 mph NE
Humidity58%
Visibility—
Dew point64°
Sat, 2288° / 64°0.03
88 °
Bethesda, Saturday, 22 August
Light rain. High 88°, low 64°.
Pressure29.88 inHg
Wind12 mph E
Humidity64%
Visibility—
Dew point65°
Sun, 2379° / 65°0
79 °
Bethesda, Sunday, 23 August
Light rain. High 79°, low 65°.
Pressure29.85 inHg
Wind12.8 mph NE
Humidity71%
Visibility—
Dew point67°
Mon, 2472° / 65°0.01
72 °
Bethesda, Monday, 24 August
Light rain. High 72°, low 65°.
Pressure30.09 inHg
Wind13.6 mph E
Humidity79%
Visibility—
Dew point64°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2579° / 64°0.12
79 °
Bethesda, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.12 in
Chance of precipitation27%
Record high90° (2003)
Record low51° (2025)
Wed, 2679° / 64°0.15
79 °
Bethesda, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.15 in
Chance of precipitation38%
Record high92° (2024)
Record low49° (2025)
Thu, 2779° / 65°0.11
79 °
Bethesda, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high79°
Average low65°
Average precipitation0.11 in
Chance of precipitation33%
Record high93° (1976)
Record low51° (2025)
Fri, 2878° / 64°0.13
78 °
Bethesda, Friday, 28 August
Climate normal for this date — 60-year average.
Average high78°
Average low64°
Average precipitation0.13 in
Chance of precipitation37%
Record high91° (1984)
Record low46° (1986)
Sat, 2978° / 63°0.11
78 °
Bethesda, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high78°
Average low63°
Average precipitation0.11 in
Chance of precipitation28%
Record high92° (1984)
Record low47° (1965)
Sun, 3077° / 63°0.07
77 °
Bethesda, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high77°
Average low63°
Average precipitation0.07 in
Chance of precipitation32%
Record high91° (2013)
Record low52° (2009)
Mon, 3177° / 62°0.03
77 °
Bethesda, Monday, 31 August
Climate normal for this date — 60-year average.
Average high77°
Average low62°
Average precipitation0.03 in
Chance of precipitation15%
Record high90° (2012)
Record low50° (2025)
Tue, 0177° / 62°0.08
77 °
Bethesda, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high77°
Average low62°
Average precipitation0.08 in
Chance of precipitation23%
Record high90° (2011)
Record low48° (1967)
Wed, 0277° / 62°0.06
77 °
Bethesda, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high77°
Average low62°
Average precipitation0.06 in
Chance of precipitation23%
Record high92° (2008)
Record low49° (2025)
Thu, 0376° / 62°0.09
76 °
Bethesda, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high76°
Average low62°
Average precipitation0.09 in
Chance of precipitation28%
Record high92° (2023)
Record low47° (1974)
Fri, 0476° / 61°0.07
76 °
Bethesda, Friday, 4 September
Climate normal for this date — 60-year average.
Average high76°
Average low61°
Average precipitation0.07 in
Chance of precipitation27%
Record high90° (2023)
Record low45° (2025)
Sat, 0575° / 60°0.07
75 °
Bethesda, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high75°
Average low60°
Average precipitation0.07 in
Chance of precipitation23%
Record high89° (2023)
Record low48° (1962)
Sun, 0676° / 61°0.07
76 °
Bethesda, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high76°
Average low61°
Average precipitation0.07 in
Chance of precipitation32%
Record high91° (1990)
Record low46° (2025)
Mon, 0776° / 60°0.11
76 °
Bethesda, Monday, 7 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.11 in
Chance of precipitation33%
Record high90° (1960)
Record low44° (2025)
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 Bethesda, WI 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 Bethesda, WI 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.