Monthly outlook for Lummi Island, WA: average high 62.9°, average low 56.6°. That is 4.6° below the climate normal for August. Precipitation is expected on 2 days (about 0.3 inches), against a normal of 3 days and 0.9 inches. The warmest day looks like 10 August (75.4°), the coolest 10 August (52°).
62.9°/56.6°
Average high / low
−4.6°
Below normal
2 / 3
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
63.8°
71.9°
-4.5°
19 August – 28 August
61.5°
70.2°
-4.8°
29 August – 7 September
at normal
68.5°
—
August records over 66 years
95.2°12 August 2021All-time high
44.2°28 August 1969All-time low
Climate normals and records are computed from the nearest reference point — Bellingham (10 mi).
Mon, 1075° / 52°0
75 °
Lummi Island, Monday, 10 August
Partly cloudy. High 75°, low 52°.
Pressure30.09 inHg
Wind8.3 mph S
Humidity83%
Visibility6.2 mi
Dew point54°
Tue, 1160° / 54°0
60 °
Lummi Island, Tuesday, 11 August
Clear. High 60°, low 54°.
Pressure30.12 inHg
Wind9.8 mph S
Humidity85%
Visibility6.2 mi
Dew point54°
Wed, 1262° / 56°0
62 °
Lummi Island, Wednesday, 12 August
Clear. High 62°, low 56°.
Pressure30.03 inHg
Wind4.7 mph SW
Humidity88%
Visibility6.2 mi
Dew point55°
Thu, 1362° / 58°0
62 °
Lummi Island, Thursday, 13 August
Partly cloudy. High 62°, low 58°.
Pressure29.94 inHg
Wind2.9 mph W
Humidity86%
Visibility3.8 mi
Dew point55°
Fri, 1461° / 58°0
61 °
Lummi Island, Friday, 14 August
Overcast. High 61°, low 58°.
Pressure29.91 inHg
Wind12.1 mph S
Humidity83%
Visibility—
Dew point54°
Sat, 1560° / 57°0
60 °
Lummi Island, Saturday, 15 August
Overcast. High 60°, low 57°.
Pressure30.00 inHg
Wind18.2 mph S
Humidity87%
Visibility—
Dew point55°
Sun, 1660° / 57°0
60 °
Lummi Island, Sunday, 16 August
Overcast. High 60°, low 57°.
Pressure30.09 inHg
Wind20.2 mph S
Humidity80%
Visibility—
Dew point53°
Mon, 1761° / 57°0.13
61 °
Lummi Island, Monday, 17 August
Rain. High 61°, low 57°.
Pressure30.03 inHg
Wind16.3 mph S
Humidity80%
Visibility—
Dew point53°
Tue, 1863° / 57°0.16
63 °
Lummi Island, Tuesday, 18 August
Light rain. High 63°, low 57°.
Pressure30.00 inHg
Wind11.2 mph S
Humidity85%
Visibility—
Dew point58°
Wed, 1961° / 57°0.01
61 °
Lummi Island, Wednesday, 19 August
Light rain. High 61°, low 57°.
Pressure30.00 inHg
Wind12.6 mph S
Humidity95%
Visibility—
Dew point58°
Thu, 2063° / 58°0
63 °
Lummi Island, Thursday, 20 August
Overcast. High 63°, low 58°.
Pressure30.12 inHg
Wind15.5 mph SE
Humidity80%
Visibility—
Dew point55°
Fri, 2161° / 57°0
61 °
Lummi Island, Friday, 21 August
Overcast. High 61°, low 57°.
Pressure30.15 inHg
Wind8.4 mph NW
Humidity93%
Visibility—
Dew point58°
Sat, 2261° / 57°0
61 °
Lummi Island, Saturday, 22 August
Overcast. High 61°, low 57°.
Pressure30.15 inHg
Wind5.7 mph NW
Humidity90%
Visibility—
Dew point57°
Sun, 2362° / 58°0
62 °
Lummi Island, Sunday, 23 August
Partly cloudy. High 62°, low 58°.
Pressure30.03 inHg
Wind7.2 mph NW
Humidity90%
Visibility—
Dew point56°
Mon, 2461° / 59°0
61 °
Lummi Island, Monday, 24 August
Overcast. High 61°, low 59°.
Pressure29.97 inHg
Wind8.1 mph NW
Humidity88%
Visibility—
Dew point55°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2570° / 56°0.07
70 °
Lummi Island, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high70°
Average low56°
Average precipitation0.07 in
Chance of precipitation22%
Record high90° (1996)
Record low48° (1995)
Wed, 2671° / 56°0.07
71 °
Lummi Island, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high71°
Average low56°
Average precipitation0.07 in
Chance of precipitation25%
Record high87° (1986)
Record low49° (1977)
Thu, 2770° / 56°0.13
70 °
Lummi Island, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high70°
Average low56°
Average precipitation0.13 in
Chance of precipitation28%
Record high90° (1986)
Record low48° (1965)
Fri, 2870° / 56°0.07
70 °
Lummi Island, Friday, 28 August
Climate normal for this date — 60-year average.
Average high70°
Average low56°
Average precipitation0.07 in
Chance of precipitation22%
Record high88° (1967)
Record low44° (1969)
Sat, 2970° / 56°0.1
70 °
Lummi Island, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high70°
Average low56°
Average precipitation0.1 in
Chance of precipitation30%
Record high87° (1996)
Record low47° (1965)
Sun, 3068° / 56°0.12
68 °
Lummi Island, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high68°
Average low56°
Average precipitation0.12 in
Chance of precipitation27%
Record high83° (2022)
Record low47° (1965)
Mon, 3168° / 56°0.1
68 °
Lummi Island, Monday, 31 August
Climate normal for this date — 60-year average.
Average high68°
Average low56°
Average precipitation0.1 in
Chance of precipitation27%
Record high89° (1987)
Record low48° (1964)
Tue, 0168° / 55°0.12
68 °
Lummi Island, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high68°
Average low55°
Average precipitation0.12 in
Chance of precipitation27%
Record high84° (1987)
Record low45° (1973)
Wed, 0269° / 55°0.07
69 °
Lummi Island, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high69°
Average low55°
Average precipitation0.07 in
Chance of precipitation25%
Record high88° (1988)
Record low46° (1960)
Thu, 0369° / 55°0.08
69 °
Lummi Island, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high69°
Average low55°
Average precipitation0.08 in
Chance of precipitation25%
Record high88° (1988)
Record low46° (1975)
Fri, 0468° / 55°0.08
68 °
Lummi Island, Friday, 4 September
Climate normal for this date — 60-year average.
Average high68°
Average low55°
Average precipitation0.08 in
Chance of precipitation28%
Record high87° (2017)
Record low44° (1970)
Sat, 0568° / 55°0.11
68 °
Lummi Island, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high68°
Average low55°
Average precipitation0.11 in
Chance of precipitation25%
Record high94° (2017)
Record low47° (1969)
Sun, 0668° / 55°0.09
68 °
Lummi Island, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high68°
Average low55°
Average precipitation0.09 in
Chance of precipitation33%
Record high83° (1987)
Record low46° (1992)
Mon, 0768° / 54°0.06
68 °
Lummi Island, Monday, 7 September
Climate normal for this date — 60-year average.
Average high68°
Average low54°
Average precipitation0.06 in
Chance of precipitation35%
Record high83° (1981)
Record low43° (1970)
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 Lummi Island, 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 Lummi Island, 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.