A historic heat wave affected the Pacific Northwest during this interval.  It was caused by a strong upper level ridge that created dry and stable conditions over the area with strong subsidence.  Many daily, monthly, and all-time high temperature records were set over southwest and south central Oregon.

Excessive Heat in KLAMATH BASIN, OREGON
From 26-JUN-21 10:00:00 to 30-JUN-21 12:57:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

On 06/26/21, the reported low temperatures in this zone ranged from 44 to 50 degrees and the high temperatures ranged from 92 to 94 degrees. On 06/27/21, the reported low temperatures in this zone ranged from 50 to 57 degrees and the high temperatures ranged from 96 to 101 degrees. On 06/28/21, the reported low temperatures in this zone ranged from 51 to 60 degrees and the high temperatures ranged from 100 to 103 degrees. On 06/29/21, the reported low temperatures in this zone ranged from 50 to 54 degrees and the high temperatures ranged from 100 to 104 degrees. On 06/30/21, the reported low temperatures in this zone ranged from 46 to 51 degrees and the high temperatures ranged from 94 to 101 degrees.  Klamath Falls set a high temperature record for the month of June with 101 degrees on 06/27, the old record was 96 degrees, set in 2015.  This record was broken the very next day, 6/28, when a high temperature of 103 degrees was recorded.

Excessive Heat in EASTERN CURRY COUNTY & JOSEPHINE COUNTY, OREGON
From 26-JUN-21 10:00:00 to 30-JUN-21 01:20:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

On 06/26/21, the reported low temperatures in this zone ranged from 54 to 68 degrees and the high temperatures ranged from 92 to 111 degrees. On 06/27/21, the reported low temperatures in this zone ranged from 61 to 72 degrees and the high temperatures ranged from 100 to 113 degrees. On 06/28/21, the reported low temperatures in this zone ranged from 66 to 76 degrees and the high temperatures ranged from 94 to 108 degrees. On 06/29/21, the reported low temperatures in this zone ranged from 55 to 65 degrees and the high temperatures ranged from 87 to 101 degrees.

Excessive Heat in CENTRAL & EASTERN LAKE COUNTY, OREGON
From 26-JUN-21 10:00:00 to 30-JUN-21 12:57:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

On 06/26/21, the reported low temperatures in this zone ranged from 51 to 59 degrees and the high temperatures ranged from 91 to 98 degrees. On 06/27/21, the reported low temperatures in this zone ranged from 49 to 70 degrees and the high temperatures ranged from 94 to 103 degrees. On 06/28/21, the reported low temperatures in this zone ranged from 57 to 66 degrees and the high temperatures ranged from 95 to 105 degrees. On 06/29/21, the reported low temperatures in this zone ranged from 51 to 70 degrees and the high temperatures ranged from 91 to 107 degrees. On 06/30/21, the reported low temperatures in this zone ranged from 55 to 62 degrees and the high temperatures ranged from 93 to 101 degrees.

Excessive Heat in JACKSON COUNTY, OREGON
From 26-JUN-21 10:00:00 to 30-JUN-21 01:20:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

On 06/26/21, the reported low temperatures in this zone ranged from 52 to 64 degrees and the high temperatures ranged from 96 to 104 degrees. On 06/27/21, the reported low temperatures in this zone ranged from 53 to 70 degrees and the high temperatures ranged from 103 to 113 degrees. On 06/28/21, the reported low temperatures in this zone ranged from 57 to 75 degrees and the high temperatures ranged from 108 to 115 degrees. On 06/29/21, the reported low temperatures in this zone ranged from 55 to 68 degrees and the high temperatures ranged from 97 to 109 degrees. Medford set a record high temperature for the month of June with 113 degrees on 06/27/21, breaking the old record of 104, set in 2015.  This record was broken the following day, 06/28, when Medford recorded a high of 115 degrees. This reading tied the all-time high temperature record, first set on 07/20/1946.

Excessive Heat in EASTERN DOUGLAS COUNTY FOOTHILLS, OREGON
From 26-JUN-21 10:00:00 to 30-JUN-21 01:20:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Toketee Falls was the only station from this zone that reported observations. On 06/26/21, the low temperature was 58 degrees and the high temperature was 91 degrees. On 06/27/21, the low temperature was 72 degrees and the high temperature was 103 degrees. On 06/28/21, the low temperature was 62 degrees and the high temperature was 108 degrees. On 06/29/21, the low temperature was 59 degrees and the high temperature was 99 degrees.

Excessive Heat in SOUTH CENTRAL OREGON CASCADES, OREGON
From 26-JUN-21 10:00:00 to 30-JUN-21 01:20:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

On 06/26/21, the reported low temperatures in this zone ranged from 51 to 56 degrees and the high temperatures ranged from 80 to 91 degrees. On 06/27/21, the reported low temperatures in this zone ranged from 54 to 62 degrees and the high temperatures ranged from 86 to 99 degrees. On 06/28/21, the reported low temperatures in this zone ranged from 56 to 70 degrees and the high temperatures ranged from 88 to 101 degrees. On 06/29/21, the reported low temperatures in this zone ranged from 56 to 60 degrees and the high temperatures ranged from 85 to 99 degrees.

Excessive Heat in CENTRAL DOUGLAS COUNTY, OREGON
From 26-JUN-21 10:00:00 to 29-JUN-21 01:20:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

On 06/26/21, the reported low temperatures in this zone ranged from 54 to 65 degrees and the high temperatures ranged from 103 to 110 degrees. On 06/27/21, the reported low temperatures in this zone ranged from 56 to 71 degrees and the high temperatures ranged from 111 to 115 degrees. On 06/28/21, the reported low temperatures in this zone ranged from 57 to 75 degrees and the high temperatures ranged from 98 to 111 degrees. On 6/27/21, Roseburg set an all-time high temperature record of 114 degrees, the old record was 109 degrees set on 8/15/2020.
On 06/26/21, Roseburg set a record for highest temperature in June with 105 degrees. This record was broken the following day.

Excessive Heat in SISKIYOU MOUNTAINS & SOUTHERN OREGON CASCADES, OREGON
From 26-JUN-21 10:00:00 to 30-JUN-21 01:20:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Howard Prairie was the only station from this zone that reported observations. On 06/26/21, the low temperature was 47 degrees and the high temperature was 89 degrees. On 06/27/21, the low temperature was 49 degrees and the high temperature was 96 degrees. On 06/28/21, the low temperature was 59 degrees and the high temperature was 100 degrees. On 06/29/21, the low temperature was 56 degrees and the high temperature was 94 degrees.